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 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * accompanied this code).
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 *
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package javax.swing;

import java.awt.*;
import java.awt.event.*;
import java.beans.JavaBean;
import java.beans.BeanProperty;
import java.beans.ConstructorProperties;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.*;
import java.util.*;
import javax.swing.event.*;
import javax.swing.plaf.*;
import javax.swing.tree.*;
import javax.swing.text.Position;
import javax.accessibility.*;

import sun.awt.AWTAccessor;
import sun.awt.AWTAccessor.MouseEventAccessor;
import sun.swing.SwingUtilities2;
import sun.swing.SwingUtilities2.Section;
import static sun.swing.SwingUtilities2.Section.*;


A control that displays a set of hierarchical data as an outline.
You can find task-oriented documentation and examples of using trees in
How to Use Trees,
a section in The Java Tutorial.

A specific node in a tree can be identified either by a
TreePath (an object
that encapsulates a node and all of its ancestors), or by its
display row, where each row in the display area displays one node.
An expanded node is a non-leaf node (as identified by
TreeModel.isLeaf(node) returning false) that will displays
its children when all its ancestors are expanded.
A collapsed
node is one which hides them. A hidden node is one which is
under a collapsed ancestor. All of a viewable nodes parents
are expanded, but may or may not be displayed. A displayed node
is both viewable and in the display area, where it can be seen.

The following JTree methods use "visible" to mean "displayed":

isRootVisible()
setRootVisible()
scrollPathToVisible()
scrollRowToVisible()
getVisibleRowCount()
setVisibleRowCount()

The next group of JTree methods use "visible" to mean
"viewable" (under an expanded parent):

isVisible()
makeVisible()

If you are interested in knowing when the selection changes implement
the TreeSelectionListener interface and add the instance
using the method addTreeSelectionListener.
valueChanged will be invoked when the
selection changes, that is if the user clicks twice on the same
node valueChanged will only be invoked once.

If you are interested in detecting either double-click events or when
a user clicks on a node, regardless of whether or not it was selected,
we recommend you do the following:

final JTree tree = ...;
MouseListener ml = new MouseAdapter() {
    public void mousePressed(MouseEvent e) {
        int selRow = tree.getRowForLocation(e.getX(), e.getY());
        TreePath selPath = tree.getPathForLocation(e.getX(), e.getY());
        if(selRow != -1) {
            if(e.getClickCount() == 1) {
                mySingleClick(selRow, selPath);
            }
            else if(e.getClickCount() == 2) {
                myDoubleClick(selRow, selPath);
            }
        }
    }
};
tree.addMouseListener(ml);

NOTE: This example obtains both the path and row, but you only need to
get the one you're interested in.

To use JTree to display compound nodes (for example, nodes containing both a graphic icon and text), subclass TreeCellRenderer and use setCellRenderer to tell the tree to use it. To edit such nodes, subclass TreeCellEditor and use setCellEditor. 

Like all JComponent classes, you can use InputMap and ActionMap to associate an Action object with a KeyStroke and execute the action under specified conditions. 
Warning: Swing is not thread safe. For more
information see Swing's Threading
Policy.

Warning:
Serialized objects of this class will not be compatible with
future Swing releases. The current serialization support is
appropriate for short term storage or RMI between applications running
the same version of Swing.  As of 1.4, support for long term storage
of all JavaBeans™
has been added to the java.beans package. Please see XMLEncoder. 
Author:
Rob Davis, Ray Ryan, Scott Violet
Since:
1.2/**
 * <a id="jtree_description"></a>
 * A control that displays a set of hierarchical data as an outline.
 * You can find task-oriented documentation and examples of using trees in
 * <a href="http://docs.oracle.com/javase/tutorial/uiswing/components/tree.html">How to Use Trees</a>,
 * a section in <em>The Java Tutorial.</em>
 * <p>
 * A specific node in a tree can be identified either by a
 * <code>TreePath</code> (an object
 * that encapsulates a node and all of its ancestors), or by its
 * display row, where each row in the display area displays one node.
 * An <i>expanded</i> node is a non-leaf node (as identified by
 * <code>TreeModel.isLeaf(node)</code> returning false) that will displays
 * its children when all its ancestors are <i>expanded</i>.
 * A <i>collapsed</i>
 * node is one which hides them. A <i>hidden</i> node is one which is
 * under a collapsed ancestor. All of a <i>viewable</i> nodes parents
 * are expanded, but may or may not be displayed. A <i>displayed</i> node
 * is both viewable and in the display area, where it can be seen.
 * </p>
 * The following <code>JTree</code> methods use "visible" to mean "displayed":
 * <ul>
 * <li><code>isRootVisible()</code>
 * <li><code>setRootVisible()</code>
 * <li><code>scrollPathToVisible()</code>
 * <li><code>scrollRowToVisible()</code>
 * <li><code>getVisibleRowCount()</code>
 * <li><code>setVisibleRowCount()</code>
 * </ul>
 * The next group of <code>JTree</code> methods use "visible" to mean
 * "viewable" (under an expanded parent):
 * <ul>
 * <li><code>isVisible()</code>
 * <li><code>makeVisible()</code>
 * </ul>
 * If you are interested in knowing when the selection changes implement
 * the <code>TreeSelectionListener</code> interface and add the instance
 * using the method <code>addTreeSelectionListener</code>.
 * <code>valueChanged</code> will be invoked when the
 * selection changes, that is if the user clicks twice on the same
 * node <code>valueChanged</code> will only be invoked once.
 * <p>
 * If you are interested in detecting either double-click events or when
 * a user clicks on a node, regardless of whether or not it was selected,
 * we recommend you do the following:
 * </p>
 * <pre>
 * final JTree tree = ...;
 *
 * MouseListener ml = new MouseAdapter() {
 *     public void <b>mousePressed</b>(MouseEvent e) {
 *         int selRow = tree.getRowForLocation(e.getX(), e.getY());
 *         TreePath selPath = tree.getPathForLocation(e.getX(), e.getY());
 *         if(selRow != -1) {
 *             if(e.getClickCount() == 1) {
 *                 mySingleClick(selRow, selPath);
 *             }
 *             else if(e.getClickCount() == 2) {
 *                 myDoubleClick(selRow, selPath);
 *             }
 *         }
 *     }
 * };
 * tree.addMouseListener(ml);
 * </pre>
 * NOTE: This example obtains both the path and row, but you only need to
 * get the one you're interested in.
 * <p>
 * To use <code>JTree</code> to display compound nodes
 * (for example, nodes containing both
 * a graphic icon and text), subclass {@link TreeCellRenderer} and use
 * {@link #setCellRenderer} to tell the tree to use it. To edit such nodes,
 * subclass {@link TreeCellEditor} and use {@link #setCellEditor}.
 * </p>
 * <p>
 * Like all <code>JComponent</code> classes, you can use {@link InputMap} and
 * {@link ActionMap}
 * to associate an {@link Action} object with a {@link KeyStroke}
 * and execute the action under specified conditions.
 * </p>
 * <strong>Warning:</strong> Swing is not thread safe. For more
 * information see <a
 * href="package-summary.html#threading">Swing's Threading
 * Policy</a>.
 * <p>
 * <strong>Warning:</strong>
 * Serialized objects of this class will not be compatible with
 * future Swing releases. The current serialization support is
 * appropriate for short term storage or RMI between applications running
 * the same version of Swing.  As of 1.4, support for long term storage
 * of all JavaBeans&trade;
 * has been added to the <code>java.beans</code> package.
 * Please see {@link java.beans.XMLEncoder}.
 *</p>
 *
 * @author Rob Davis
 * @author Ray Ryan
 * @author Scott Violet
 * @since 1.2
 */
@JavaBean(defaultProperty = "UI", description = "A component that displays a set of hierarchical data as an outline.")
@SwingContainer(false)
@SuppressWarnings("serial")
public class JTree extends JComponent implements Scrollable, Accessible
{
    
See Also:
getUIClassID
readObject/**
     * @see #getUIClassID
     * @see #readObject
     */
    private static final String uiClassID = "TreeUI";

    
The model that defines the tree displayed by this object.
/**
     * The model that defines the tree displayed by this object.
     */
    protected transient TreeModel        treeModel;

    
Models the set of selected nodes in this tree.
/**
     * Models the set of selected nodes in this tree.
     */
    protected transient TreeSelectionModel selectionModel;

    
True if the root node is displayed, false if its children are
the highest visible nodes.
/**
     * True if the root node is displayed, false if its children are
     * the highest visible nodes.
     */
    protected boolean                    rootVisible;

    
The cell used to draw nodes. If null, the UI uses a default
cellRenderer.
/**
     * The cell used to draw nodes. If <code>null</code>, the UI uses a default
     * <code>cellRenderer</code>.
     */
    protected transient TreeCellRenderer  cellRenderer;

    
Height to use for each display row. If this is <= 0 the renderer
determines the height for each row.
/**
     * Height to use for each display row. If this is &lt;= 0 the renderer
     * determines the height for each row.
     */
    protected int                         rowHeight;
    private boolean                       rowHeightSet = false;

    
Maps from TreePath to Boolean
indicating whether or not the
particular path is expanded. This ONLY indicates whether a
given path is expanded, and NOT if it is visible or not. That
information must be determined by visiting all the parent
paths and seeing if they are visible.
/**
     * Maps from <code>TreePath</code> to <code>Boolean</code>
     * indicating whether or not the
     * particular path is expanded. This ONLY indicates whether a
     * given path is expanded, and NOT if it is visible or not. That
     * information must be determined by visiting all the parent
     * paths and seeing if they are visible.
     */
    private transient Hashtable<TreePath, Boolean> expandedState;


    
True if handles are displayed at the topmost level of the tree.

A handle is a small icon that displays adjacent to the node which
allows the user to click once to expand or collapse the node. A
common interface shows a plus sign (+) for a node which can be
expanded and a minus sign (-) for a node which can be collapsed.
Handles are always shown for nodes below the topmost level.

If the rootVisible setting specifies that the root
node is to be displayed, then that is the only node at the topmost
level. If the root node is not displayed, then all of its
children are at the topmost level of the tree. Handles are
always displayed for nodes other than the topmost.

If the root node isn't visible, it is generally a good to make
this value true. Otherwise, the tree looks exactly like a list,
and users may not know that the "list entries" are actually
tree nodes.
See Also:
rootVisible/**
     * True if handles are displayed at the topmost level of the tree.
     * <p>
     * A handle is a small icon that displays adjacent to the node which
     * allows the user to click once to expand or collapse the node. A
     * common interface shows a plus sign (+) for a node which can be
     * expanded and a minus sign (-) for a node which can be collapsed.
     * Handles are always shown for nodes below the topmost level.
     * <p>
     * If the <code>rootVisible</code> setting specifies that the root
     * node is to be displayed, then that is the only node at the topmost
     * level. If the root node is not displayed, then all of its
     * children are at the topmost level of the tree. Handles are
     * always displayed for nodes other than the topmost.
     * <p>
     * If the root node isn't visible, it is generally a good to make
     * this value true. Otherwise, the tree looks exactly like a list,
     * and users may not know that the "list entries" are actually
     * tree nodes.
     *
     * @see #rootVisible
     */
    protected boolean           showsRootHandles;
    private boolean             showsRootHandlesSet = false;

    
Creates a new event and passed it off the
selectionListeners.
/**
     * Creates a new event and passed it off the
     * <code>selectionListeners</code>.
     */
    protected transient TreeSelectionRedirector selectionRedirector;

    
Editor for the entries.  Default is null
(tree is not editable).
/**
     * Editor for the entries.  Default is <code>null</code>
     * (tree is not editable).
     */
    protected transient TreeCellEditor          cellEditor;

    
Is the tree editable? Default is false.
/**
     * Is the tree editable? Default is false.
     */
    protected boolean                 editable;

    
Is this tree a large model? This is a code-optimization setting.
A large model can be used when the cell height is the same for all
nodes. The UI will then cache very little information and instead
continually message the model. Without a large model the UI caches
most of the information, resulting in fewer method calls to the model.

This value is only a suggestion to the UI. Not all UIs will
take advantage of it. Default value is false.
/**
     * Is this tree a large model? This is a code-optimization setting.
     * A large model can be used when the cell height is the same for all
     * nodes. The UI will then cache very little information and instead
     * continually message the model. Without a large model the UI caches
     * most of the information, resulting in fewer method calls to the model.
     * <p>
     * This value is only a suggestion to the UI. Not all UIs will
     * take advantage of it. Default value is false.
     */
    protected boolean                 largeModel;

    
Number of rows to make visible at one time. This value is used for
the Scrollable interface. It determines the preferred
size of the display area.
/**
     * Number of rows to make visible at one time. This value is used for
     * the <code>Scrollable</code> interface. It determines the preferred
     * size of the display area.
     */
    protected int                     visibleRowCount;

    
If true, when editing is to be stopped by way of selection changing,
data in tree changing or other means stopCellEditing
is invoked, and changes are saved. If false,
cancelCellEditing is invoked, and changes
are discarded. Default is false.
/**
     * If true, when editing is to be stopped by way of selection changing,
     * data in tree changing or other means <code>stopCellEditing</code>
     * is invoked, and changes are saved. If false,
     * <code>cancelCellEditing</code> is invoked, and changes
     * are discarded. Default is false.
     */
    protected boolean                 invokesStopCellEditing;

    
If true, when a node is expanded, as many of the descendants are
scrolled to be visible.
/**
     * If true, when a node is expanded, as many of the descendants are
     * scrolled to be visible.
     */
    protected boolean                 scrollsOnExpand;
    private boolean                   scrollsOnExpandSet = false;

    
Number of mouse clicks before a node is expanded.
/**
     * Number of mouse clicks before a node is expanded.
     */
    protected int                     toggleClickCount;

    
Updates the expandedState.
/**
     * Updates the <code>expandedState</code>.
     */
    protected transient TreeModelListener       treeModelListener;

    
Used when setExpandedState is invoked,
will be a Stack of Stacks.
/**
     * Used when <code>setExpandedState</code> is invoked,
     * will be a <code>Stack</code> of <code>Stack</code>s.
     */
    private transient Stack<Stack<TreePath>> expandedStack;

    
Lead selection path, may not be null.
/**
     * Lead selection path, may not be <code>null</code>.
     */
    private TreePath                  leadPath;

    
Anchor path.
/**
     * Anchor path.
     */
    private TreePath                  anchorPath;

    
True if paths in the selection should be expanded.
/**
     * True if paths in the selection should be expanded.
     */
    private boolean                   expandsSelectedPaths;

    
This is set to true for the life of the setUI call.
/**
     * This is set to true for the life of the <code>setUI</code> call.
     */
    private boolean                   settingUI;

    
If true, mouse presses on selections initiate a drag operation. /** If true, mouse presses on selections initiate a drag operation. */
    private boolean dragEnabled;

    
The drop mode for this component.
/**
     * The drop mode for this component.
     */
    private DropMode dropMode = DropMode.USE_SELECTION;

    
The drop location.
/**
     * The drop location.
     */
    private transient DropLocation dropLocation;

    
Flag to indicate UI update is in progress
/**
     * Flag to indicate UI update is in progress
     */
    private transient boolean updateInProgress;

    
A subclass of TransferHandler.DropLocation representing
a drop location for a JTree.
See Also:
getDropLocation
Since:
1.6/**
     * A subclass of <code>TransferHandler.DropLocation</code> representing
     * a drop location for a <code>JTree</code>.
     *
     * @see #getDropLocation
     * @since 1.6
     */
    public static final class DropLocation extends TransferHandler.DropLocation {
        private final TreePath path;
        private final int index;

        private DropLocation(Point p, TreePath path, int index) {
            super(p);
            this.path = path;
            this.index = index;
        }

        
Returns the index where the dropped data should be inserted
with respect to the path returned by getPath().

For drop modes DropMode.USE_SELECTION and
DropMode.ON, this index is unimportant (and it will
always be -1) as the only interesting data is the
path over which the drop operation occurred.

For drop mode DropMode.INSERT, this index
indicates the index at which the data should be inserted into
the parent path represented by getPath().
-1 indicates that the drop occurred over the
parent itself, and in most cases should be treated as inserting
into either the beginning or the end of the parent's list of
children.

For DropMode.ON_OR_INSERT, this value will be
an insert index, as described above, or -1 if
the drop occurred over the path itself.
See Also:
getPath
Returns:
the child index/**
         * Returns the index where the dropped data should be inserted
         * with respect to the path returned by <code>getPath()</code>.
         * <p>
         * For drop modes <code>DropMode.USE_SELECTION</code> and
         * <code>DropMode.ON</code>, this index is unimportant (and it will
         * always be <code>-1</code>) as the only interesting data is the
         * path over which the drop operation occurred.
         * <p>
         * For drop mode <code>DropMode.INSERT</code>, this index
         * indicates the index at which the data should be inserted into
         * the parent path represented by <code>getPath()</code>.
         * <code>-1</code> indicates that the drop occurred over the
         * parent itself, and in most cases should be treated as inserting
         * into either the beginning or the end of the parent's list of
         * children.
         * <p>
         * For <code>DropMode.ON_OR_INSERT</code>, this value will be
         * an insert index, as described above, or <code>-1</code> if
         * the drop occurred over the path itself.
         *
         * @return the child index
         * @see #getPath
         */
        public int getChildIndex() {
            return index;
        }

        
Returns the path where dropped data should be placed in the
tree.

Interpretation of this value depends on the drop mode set on the
component. If the drop mode is DropMode.USE_SELECTION
or DropMode.ON, the return value is the path in the
tree over which the data has been (or will be) dropped.
null indicates that the drop is over empty space,
not associated with a particular path.

If the drop mode is DropMode.INSERT, the return value
refers to the path that should become the parent of the new data,
in which case getChildIndex() indicates where the
new item should be inserted into this parent path. A
null path indicates that no parent path has been
determined, which can happen for multiple reasons:

   
The tree has no model
   
There is no root in the tree
   
The root is collapsed
   
The root is a leaf node

It is up to the developer to decide if and how they wish to handle
the null case.

If the drop mode is DropMode.ON_OR_INSERT,
getChildIndex can be used to determine whether the
drop is on top of the path itself (-1) or the index
at which it should be inserted into the path (values other than
-1).
See Also:
getChildIndex
Returns:
the drop path/**
         * Returns the path where dropped data should be placed in the
         * tree.
         * <p>
         * Interpretation of this value depends on the drop mode set on the
         * component. If the drop mode is <code>DropMode.USE_SELECTION</code>
         * or <code>DropMode.ON</code>, the return value is the path in the
         * tree over which the data has been (or will be) dropped.
         * <code>null</code> indicates that the drop is over empty space,
         * not associated with a particular path.
         * <p>
         * If the drop mode is <code>DropMode.INSERT</code>, the return value
         * refers to the path that should become the parent of the new data,
         * in which case <code>getChildIndex()</code> indicates where the
         * new item should be inserted into this parent path. A
         * <code>null</code> path indicates that no parent path has been
         * determined, which can happen for multiple reasons:
         * <ul>
         *    <li>The tree has no model
         *    <li>There is no root in the tree
         *    <li>The root is collapsed
         *    <li>The root is a leaf node
         * </ul>
         * It is up to the developer to decide if and how they wish to handle
         * the <code>null</code> case.
         * <p>
         * If the drop mode is <code>DropMode.ON_OR_INSERT</code>,
         * <code>getChildIndex</code> can be used to determine whether the
         * drop is on top of the path itself (<code>-1</code>) or the index
         * at which it should be inserted into the path (values other than
         * <code>-1</code>).
         *
         * @return the drop path
         * @see #getChildIndex
         */
        public TreePath getPath() {
            return path;
        }

        
Returns a string representation of this drop location.
This method is intended to be used for debugging purposes,
and the content and format of the returned string may vary
between implementations.
Returns:
a string representation of this drop location/**
         * Returns a string representation of this drop location.
         * This method is intended to be used for debugging purposes,
         * and the content and format of the returned string may vary
         * between implementations.
         *
         * @return a string representation of this drop location
         */
        public String toString() {
            return getClass().getName()
                   + "[dropPoint=" + getDropPoint() + ","
                   + "path=" + path + ","
                   + "childIndex=" + index + "]";
        }
    }

    
The row to expand during DnD.
/**
     * The row to expand during DnD.
     */
    private int expandRow = -1;

    @SuppressWarnings("serial")
    private class TreeTimer extends Timer {
        public TreeTimer() {
            super(2000, null);
            setRepeats(false);
        }

        public void fireActionPerformed(ActionEvent ae) {
            JTree.this.expandRow(expandRow);
        }
    }

    
A timer to expand nodes during drop.
/**
     * A timer to expand nodes during drop.
     */
    private TreeTimer dropTimer;

    
When addTreeExpansionListener is invoked,
and settingUI is true, this ivar gets set to the passed in
Listener. This listener is then notified first in
fireTreeCollapsed and fireTreeExpanded.
This is an ugly workaround for a way to have the UI listener
get notified before other listeners.
/**
     * When <code>addTreeExpansionListener</code> is invoked,
     * and <code>settingUI</code> is true, this ivar gets set to the passed in
     * <code>Listener</code>. This listener is then notified first in
     * <code>fireTreeCollapsed</code> and <code>fireTreeExpanded</code>.
     * <p>This is an ugly workaround for a way to have the UI listener
     * get notified before other listeners.
     */
    private transient TreeExpansionListener     uiTreeExpansionListener;

    
Max number of stacks to keep around.
/**
     * Max number of stacks to keep around.
     */
    private static int                TEMP_STACK_SIZE = 11;

    //
    // Bound property names
    //
    
Bound property name for cellRenderer. /** Bound property name for <code>cellRenderer</code>. */
    public static final String        CELL_RENDERER_PROPERTY = "cellRenderer";
    
Bound property name for treeModel. /** Bound property name for <code>treeModel</code>. */
    public static final String        TREE_MODEL_PROPERTY = "model";
    
Bound property name for rootVisible. /** Bound property name for <code>rootVisible</code>. */
    public static final String        ROOT_VISIBLE_PROPERTY = "rootVisible";
    
Bound property name for showsRootHandles. /** Bound property name for <code>showsRootHandles</code>. */
    public static final String        SHOWS_ROOT_HANDLES_PROPERTY = "showsRootHandles";
    
Bound property name for rowHeight. /** Bound property name for <code>rowHeight</code>. */
    public static final String        ROW_HEIGHT_PROPERTY = "rowHeight";
    
Bound property name for cellEditor. /** Bound property name for <code>cellEditor</code>. */
    public static final String        CELL_EDITOR_PROPERTY = "cellEditor";
    
Bound property name for editable. /** Bound property name for <code>editable</code>. */
    public static final String        EDITABLE_PROPERTY = "editable";
    
Bound property name for largeModel. /** Bound property name for <code>largeModel</code>. */
    public static final String        LARGE_MODEL_PROPERTY = "largeModel";
    
Bound property name for selectionModel. /** Bound property name for selectionModel. */
    public static final String        SELECTION_MODEL_PROPERTY = "selectionModel";
    
Bound property name for visibleRowCount. /** Bound property name for <code>visibleRowCount</code>. */
    public static final String        VISIBLE_ROW_COUNT_PROPERTY = "visibleRowCount";
    
Bound property name for messagesStopCellEditing. /** Bound property name for <code>messagesStopCellEditing</code>. */
    public static final String        INVOKES_STOP_CELL_EDITING_PROPERTY = "invokesStopCellEditing";
    
Bound property name for scrollsOnExpand. /** Bound property name for <code>scrollsOnExpand</code>. */
    public static final String        SCROLLS_ON_EXPAND_PROPERTY = "scrollsOnExpand";
    
Bound property name for toggleClickCount. /** Bound property name for <code>toggleClickCount</code>. */
    public static final String        TOGGLE_CLICK_COUNT_PROPERTY = "toggleClickCount";
    
Bound property name for leadSelectionPath.
Since:
1.3/** Bound property name for <code>leadSelectionPath</code>.
     * @since 1.3 */
    public static final String        LEAD_SELECTION_PATH_PROPERTY = "leadSelectionPath";
    
Bound property name for anchor selection path.
Since:
1.3/** Bound property name for anchor selection path.
     * @since 1.3 */
    public static final String        ANCHOR_SELECTION_PATH_PROPERTY = "anchorSelectionPath";
    
Bound property name for expands selected paths property
Since:
1.3/** Bound property name for expands selected paths property
     * @since 1.3 */
    public static final String        EXPANDS_SELECTED_PATHS_PROPERTY = "expandsSelectedPaths";


    
Creates and returns a sample TreeModel.
Used primarily for beanbuilders to show something interesting.
Returns:
the default TreeModel/**
     * Creates and returns a sample <code>TreeModel</code>.
     * Used primarily for beanbuilders to show something interesting.
     *
     * @return the default <code>TreeModel</code>
     */
    protected static TreeModel getDefaultTreeModel() {
        DefaultMutableTreeNode      root = new DefaultMutableTreeNode("JTree");
        DefaultMutableTreeNode      parent;

        parent = new DefaultMutableTreeNode("colors");
        root.add(parent);
        parent.add(new DefaultMutableTreeNode("blue"));
        parent.add(new DefaultMutableTreeNode("violet"));
        parent.add(new DefaultMutableTreeNode("red"));
        parent.add(new DefaultMutableTreeNode("yellow"));

        parent = new DefaultMutableTreeNode("sports");
        root.add(parent);
        parent.add(new DefaultMutableTreeNode("basketball"));
        parent.add(new DefaultMutableTreeNode("soccer"));
        parent.add(new DefaultMutableTreeNode("football"));
        parent.add(new DefaultMutableTreeNode("hockey"));

        parent = new DefaultMutableTreeNode("food");
        root.add(parent);
        parent.add(new DefaultMutableTreeNode("hot dogs"));
        parent.add(new DefaultMutableTreeNode("pizza"));
        parent.add(new DefaultMutableTreeNode("ravioli"));
        parent.add(new DefaultMutableTreeNode("bananas"));
        return new DefaultTreeModel(root);
    }

    
Returns a TreeModel wrapping the specified object.
If the object is:

an array of Objects,
a Hashtable, or
a Vector
then a new root node is created with each of the incoming objects as children. Otherwise, a new root is created with a value of "root". 
Params:
value –  the Object used as the foundation for
         the TreeModel
Returns:
a TreeModel wrapping the specified object/**
     * Returns a <code>TreeModel</code> wrapping the specified object.
     * If the object is:<ul>
     * <li>an array of <code>Object</code>s,
     * <li>a <code>Hashtable</code>, or
     * <li>a <code>Vector</code>
     * </ul>then a new root node is created with each of the incoming
     * objects as children. Otherwise, a new root is created with
     * a value of {@code "root"}.
     *
     * @param value  the <code>Object</code> used as the foundation for
     *          the <code>TreeModel</code>
     * @return a <code>TreeModel</code> wrapping the specified object
     */
    protected static TreeModel createTreeModel(Object value) {
        DefaultMutableTreeNode           root;

        if((value instanceof Object[]) || (value instanceof Hashtable) ||
           (value instanceof Vector)) {
            root = new DefaultMutableTreeNode("root");
            DynamicUtilTreeNode.createChildren(root, value);
        }
        else {
            root = new DynamicUtilTreeNode("root", value);
        }
        return new DefaultTreeModel(root, false);
    }

    
Returns a JTree with a sample model.
The default model used by the tree defines a leaf node as any node
without children.
See Also:
asksAllowsChildren.asksAllowsChildren/**
     * Returns a <code>JTree</code> with a sample model.
     * The default model used by the tree defines a leaf node as any node
     * without children.
     *
     * @see DefaultTreeModel#asksAllowsChildren
     */
    public JTree() {
        this(getDefaultTreeModel());
    }

    
Returns a JTree with each element of the
specified array as the
child of a new root node which is not displayed.
By default, the tree defines a leaf node as any node without
children.
Params:
value –  an array of Objects
See Also:
DefaultTreeModel.asksAllowsChildren/**
     * Returns a <code>JTree</code> with each element of the
     * specified array as the
     * child of a new root node which is not displayed.
     * By default, the tree defines a leaf node as any node without
     * children.
     *
     * @param value  an array of <code>Object</code>s
     * @see DefaultTreeModel#asksAllowsChildren
     */
    public JTree(Object[] value) {
        this(createTreeModel(value));
        this.setRootVisible(false);
        this.setShowsRootHandles(true);
        expandRoot();
    }

    
Returns a JTree with each element of the specified
Vector as the
child of a new root node which is not displayed. By default, the
tree defines a leaf node as any node without children.
Params:
value –  a Vector
See Also:
DefaultTreeModel.asksAllowsChildren/**
     * Returns a <code>JTree</code> with each element of the specified
     * <code>Vector</code> as the
     * child of a new root node which is not displayed. By default, the
     * tree defines a leaf node as any node without children.
     *
     * @param value  a <code>Vector</code>
     * @see DefaultTreeModel#asksAllowsChildren
     */
    public JTree(Vector<?> value) {
        this(createTreeModel(value));
        this.setRootVisible(false);
        this.setShowsRootHandles(true);
        expandRoot();
    }

    
Returns a JTree created from a Hashtable
which does not display with root.
Each value-half of the key/value pairs in the HashTable
becomes a child of the new root node. By default, the tree defines
a leaf node as any node without children.
Params:
value –  a Hashtable
See Also:
DefaultTreeModel.asksAllowsChildren/**
     * Returns a <code>JTree</code> created from a <code>Hashtable</code>
     * which does not display with root.
     * Each value-half of the key/value pairs in the <code>HashTable</code>
     * becomes a child of the new root node. By default, the tree defines
     * a leaf node as any node without children.
     *
     * @param value  a <code>Hashtable</code>
     * @see DefaultTreeModel#asksAllowsChildren
     */
    public JTree(Hashtable<?,?> value) {
        this(createTreeModel(value));
        this.setRootVisible(false);
        this.setShowsRootHandles(true);
        expandRoot();
    }

    
Returns a JTree with the specified
TreeNode as its root,
which displays the root node.
By default, the tree defines a leaf node as any node without children.
Params:
root –  a TreeNode object
See Also:
DefaultTreeModel.asksAllowsChildren/**
     * Returns a <code>JTree</code> with the specified
     * <code>TreeNode</code> as its root,
     * which displays the root node.
     * By default, the tree defines a leaf node as any node without children.
     *
     * @param root  a <code>TreeNode</code> object
     * @see DefaultTreeModel#asksAllowsChildren
     */
    public JTree(TreeNode root) {
        this(root, false);
    }

    
Returns a JTree with the specified TreeNode
as its root, which
displays the root node and which decides whether a node is a
leaf node in the specified manner.
Params:
root –  a TreeNode object
asksAllowsChildren –  if false, any node without children is a
             leaf node; if true, only nodes that do not allow
             children are leaf nodes
See Also:
DefaultTreeModel.asksAllowsChildren/**
     * Returns a <code>JTree</code> with the specified <code>TreeNode</code>
     * as its root, which
     * displays the root node and which decides whether a node is a
     * leaf node in the specified manner.
     *
     * @param root  a <code>TreeNode</code> object
     * @param asksAllowsChildren  if false, any node without children is a
     *              leaf node; if true, only nodes that do not allow
     *              children are leaf nodes
     * @see DefaultTreeModel#asksAllowsChildren
     */
    public JTree(TreeNode root, boolean asksAllowsChildren) {
        this(new DefaultTreeModel(root, asksAllowsChildren));
    }

    
Returns an instance of JTree which displays the root node
-- the tree is created using the specified data model.
Params:
newModel –  the TreeModel to use as the data model/**
     * Returns an instance of <code>JTree</code> which displays the root node
     * -- the tree is created using the specified data model.
     *
     * @param newModel  the <code>TreeModel</code> to use as the data model
     */
    @ConstructorProperties({"model"})
    public JTree(TreeModel newModel) {
        super();
        expandedStack = new Stack<Stack<TreePath>>();
        toggleClickCount = 2;
        expandedState = new Hashtable<TreePath, Boolean>();
        setLayout(null);
        rowHeight = 16;
        visibleRowCount = 20;
        rootVisible = true;
        selectionModel = new DefaultTreeSelectionModel();
        cellRenderer = null;
        scrollsOnExpand = true;
        setOpaque(true);
        expandsSelectedPaths = true;
        updateUI();
        setModel(newModel);
    }

    
Returns the L&F object that renders this component.
Returns:
the TreeUI object that renders this component/**
     * Returns the L&amp;F object that renders this component.
     *
     * @return the <code>TreeUI</code> object that renders this component
     */
    public TreeUI getUI() {
        return (TreeUI)ui;
    }

    
Sets the L&F object that renders this component.

This is a bound property.
Params:
ui –  the TreeUI L&F object
See Also:
UIDefaults.getUI/**
     * Sets the L&amp;F object that renders this component.
     * <p>
     * This is a bound property.
     *
     * @param ui  the <code>TreeUI</code> L&amp;F object
     * @see UIDefaults#getUI
     */
    @BeanProperty(hidden = true, visualUpdate = true, description
            = "The UI object that implements the Component's LookAndFeel.")
    public void setUI(TreeUI ui) {
        if (this.ui != ui) {
            settingUI = true;
            uiTreeExpansionListener = null;
            try {
                super.setUI(ui);
            }
            finally {
                settingUI = false;
            }
        }
    }

    
Notification from the UIManager that the L&F has changed.
Replaces the current UI object with the latest version from the
UIManager.
See Also:
updateUI.updateUI/**
     * Notification from the <code>UIManager</code> that the L&amp;F has changed.
     * Replaces the current UI object with the latest version from the
     * <code>UIManager</code>.
     *
     * @see JComponent#updateUI
     */
    public void updateUI() {
        if (!updateInProgress) {

            updateInProgress = true;

            try {
                setUI((TreeUI)UIManager.getUI(this));

                SwingUtilities.updateRendererOrEditorUI(getCellRenderer());
                SwingUtilities.updateRendererOrEditorUI(getCellEditor());
            } finally {
                updateInProgress = false;
            }
        }
    }


    
Returns the name of the L&F class that renders this component.
See Also:
JComponent.getUIClassID
UIDefaults.getUI
Returns:
the string "TreeUI"/**
     * Returns the name of the L&amp;F class that renders this component.
     *
     * @return the string "TreeUI"
     * @see JComponent#getUIClassID
     * @see UIDefaults#getUI
     */
    @BeanProperty(bound = false)
    public String getUIClassID() {
        return uiClassID;
    }


    
Returns the current TreeCellRenderer
 that is rendering each cell.
Returns:
the TreeCellRenderer that is rendering each cell/**
     * Returns the current <code>TreeCellRenderer</code>
     *  that is rendering each cell.
     *
     * @return the <code>TreeCellRenderer</code> that is rendering each cell
     */
    public TreeCellRenderer getCellRenderer() {
        return cellRenderer;
    }

    
Sets the TreeCellRenderer that will be used to
draw each cell.

This is a bound property.
Params:
x –  the TreeCellRenderer that is to render each cell/**
     * Sets the <code>TreeCellRenderer</code> that will be used to
     * draw each cell.
     * <p>
     * This is a bound property.
     *
     * @param x  the <code>TreeCellRenderer</code> that is to render each cell
     */
    @BeanProperty(description
            = "The TreeCellRenderer that will be used to draw each cell.")
    public void setCellRenderer(TreeCellRenderer x) {
        TreeCellRenderer oldValue = cellRenderer;

        cellRenderer = x;
        firePropertyChange(CELL_RENDERER_PROPERTY, oldValue, cellRenderer);
        invalidate();
    }

    
Determines whether the tree is editable. Fires a property
change event if the new setting is different from the existing
setting.

This is a bound property.
Params:
flag –  a boolean value, true if the tree is editable/**
      * Determines whether the tree is editable. Fires a property
      * change event if the new setting is different from the existing
      * setting.
     * <p>
     * This is a bound property.
      *
      * @param flag  a boolean value, true if the tree is editable
      */
    @BeanProperty(description
            = "Whether the tree is editable.")
    public void setEditable(boolean flag) {
        boolean                 oldValue = this.editable;

        this.editable = flag;
        firePropertyChange(EDITABLE_PROPERTY, oldValue, flag);
        if (accessibleContext != null) {
            accessibleContext.firePropertyChange(
                AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
                (oldValue ? AccessibleState.EDITABLE : null),
                (flag ? AccessibleState.EDITABLE : null));
        }
    }

    
Returns true if the tree is editable.
Returns:
true if the tree is editable/**
     * Returns true if the tree is editable.
     *
     * @return true if the tree is editable
     */
    public boolean isEditable() {
        return editable;
    }

    
Sets the cell editor.  A null value implies that the
tree cannot be edited.  If this represents a change in the
cellEditor, the propertyChange
method is invoked on all listeners.

This is a bound property.
Params:
cellEditor – the TreeCellEditor to use/**
     * Sets the cell editor.  A <code>null</code> value implies that the
     * tree cannot be edited.  If this represents a change in the
     * <code>cellEditor</code>, the <code>propertyChange</code>
     * method is invoked on all listeners.
     * <p>
     * This is a bound property.
     *
     * @param cellEditor the <code>TreeCellEditor</code> to use
     */
    @BeanProperty(description
            = "The cell editor. A null value implies the tree cannot be edited.")
    public void setCellEditor(TreeCellEditor cellEditor) {
        TreeCellEditor        oldEditor = this.cellEditor;

        this.cellEditor = cellEditor;
        firePropertyChange(CELL_EDITOR_PROPERTY, oldEditor, cellEditor);
        invalidate();
    }

    
Returns the editor used to edit entries in the tree.
Returns:
the TreeCellEditor in use,
         or null if the tree cannot be edited/**
     * Returns the editor used to edit entries in the tree.
     *
     * @return the <code>TreeCellEditor</code> in use,
     *          or <code>null</code> if the tree cannot be edited
     */
    public TreeCellEditor getCellEditor() {
        return cellEditor;
    }

    
Returns the TreeModel that is providing the data.
Returns:
the TreeModel that is providing the data/**
     * Returns the <code>TreeModel</code> that is providing the data.
     *
     * @return the <code>TreeModel</code> that is providing the data
     */
    public TreeModel getModel() {
        return treeModel;
    }

    
Sets the TreeModel that will provide the data.

This is a bound property.
Params:
newModel – the TreeModel that is to provide the data/**
     * Sets the <code>TreeModel</code> that will provide the data.
     * <p>
     * This is a bound property.
     *
     * @param newModel the <code>TreeModel</code> that is to provide the data
     */
    @BeanProperty(description
            = "The TreeModel that will provide the data.")
    public void setModel(TreeModel newModel) {
        clearSelection();

        TreeModel oldModel = treeModel;

        if(treeModel != null && treeModelListener != null)
            treeModel.removeTreeModelListener(treeModelListener);

        if (accessibleContext != null) {
            if (treeModel != null) {
                treeModel.removeTreeModelListener((TreeModelListener)accessibleContext);
            }
            if (newModel != null) {
                newModel.addTreeModelListener((TreeModelListener)accessibleContext);
            }
        }

        treeModel = newModel;
        clearToggledPaths();
        if(treeModel != null) {
            if(treeModelListener == null)
                treeModelListener = createTreeModelListener();
            if(treeModelListener != null)
                treeModel.addTreeModelListener(treeModelListener);

            // Mark the root as expanded, if it isn't a leaf.
            Object treeRoot = treeModel.getRoot();
            if(treeRoot != null &&
               !treeModel.isLeaf(treeRoot)) {
                expandedState.put(new TreePath(treeRoot),
                                    Boolean.TRUE);
            }
        }
        firePropertyChange(TREE_MODEL_PROPERTY, oldModel, treeModel);
        invalidate();
    }

    
Returns true if the root node of the tree is displayed.
See Also:
rootVisible
Returns:
true if the root node of the tree is displayed/**
     * Returns true if the root node of the tree is displayed.
     *
     * @return true if the root node of the tree is displayed
     * @see #rootVisible
     */
    public boolean isRootVisible() {
        return rootVisible;
    }

    
Determines whether or not the root node from
the TreeModel is visible.

This is a bound property.
Params:
rootVisible – true if the root node of the tree is to be displayed
See Also:
rootVisible/**
     * Determines whether or not the root node from
     * the <code>TreeModel</code> is visible.
     * <p>
     * This is a bound property.
     *
     * @param rootVisible true if the root node of the tree is to be displayed
     * @see #rootVisible
     */
    @BeanProperty(description
            = "Whether or not the root node from the TreeModel is visible.")
    public void setRootVisible(boolean rootVisible) {
        boolean                oldValue = this.rootVisible;

        this.rootVisible = rootVisible;
        firePropertyChange(ROOT_VISIBLE_PROPERTY, oldValue, this.rootVisible);
        if (accessibleContext != null) {
            ((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
        }
    }

    
Sets the value of the showsRootHandles property,
which specifies whether the node handles should be displayed.
The default value of this property depends on the constructor
used to create the JTree.
Some look and feels might not support handles;
they will ignore this property.

This is a bound property.
Params:
newValue – true if root handles should be displayed;
                otherwise, false
See Also:
showsRootHandles
getShowsRootHandles/**
     * Sets the value of the <code>showsRootHandles</code> property,
     * which specifies whether the node handles should be displayed.
     * The default value of this property depends on the constructor
     * used to create the <code>JTree</code>.
     * Some look and feels might not support handles;
     * they will ignore this property.
     * <p>
     * This is a bound property.
     *
     * @param newValue <code>true</code> if root handles should be displayed;
     *                 otherwise, <code>false</code>
     * @see #showsRootHandles
     * @see #getShowsRootHandles
     */
    @BeanProperty(description
            = "Whether the node handles are to be displayed.")
    public void setShowsRootHandles(boolean newValue) {
        boolean                oldValue = showsRootHandles;
        TreeModel              model = getModel();

        showsRootHandles = newValue;
        showsRootHandlesSet = true;
        firePropertyChange(SHOWS_ROOT_HANDLES_PROPERTY, oldValue,
                           showsRootHandles);
        if (accessibleContext != null) {
            ((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
        }
        invalidate();
    }

    
Returns the value of the showsRootHandles property.
See Also:
showsRootHandles
Returns:
the value of the showsRootHandles property/**
     * Returns the value of the <code>showsRootHandles</code> property.
     *
     * @return the value of the <code>showsRootHandles</code> property
     * @see #showsRootHandles
     */
    public boolean getShowsRootHandles()
    {
        return showsRootHandles;
    }

    
Sets the height of each cell, in pixels.  If the specified value
is less than or equal to zero the current cell renderer is
queried for each row's height.

This is a bound property.
Params:
rowHeight – the height of each cell, in pixels/**
     * Sets the height of each cell, in pixels.  If the specified value
     * is less than or equal to zero the current cell renderer is
     * queried for each row's height.
     * <p>
     * This is a bound property.
     *
     * @param rowHeight the height of each cell, in pixels
     */
    @BeanProperty(description
            = "The height of each cell.")
    public void setRowHeight(int rowHeight)
    {
        int                oldValue = this.rowHeight;

        this.rowHeight = rowHeight;
        rowHeightSet = true;
        firePropertyChange(ROW_HEIGHT_PROPERTY, oldValue, this.rowHeight);
        invalidate();
    }

    
Returns the height of each row.  If the returned value is less than
or equal to 0 the height for each row is determined by the
renderer.
Returns:
the height of each row/**
     * Returns the height of each row.  If the returned value is less than
     * or equal to 0 the height for each row is determined by the
     * renderer.
     *
     * @return the height of each row
     */
    public int getRowHeight()
    {
        return rowHeight;
    }

    
Returns true if the height of each display row is a fixed size.
Returns:
true if the height of each row is a fixed size/**
     * Returns true if the height of each display row is a fixed size.
     *
     * @return true if the height of each row is a fixed size
     */
    @BeanProperty(bound = false)
    public boolean isFixedRowHeight()
    {
        return (rowHeight > 0);
    }

    
Specifies whether the UI should use a large model.
(Not all UIs will implement this.) Fires a property change
for the LARGE_MODEL_PROPERTY.

This is a bound property.
Params:
newValue – true to suggest a large model to the UI
See Also:
largeModel/**
     * Specifies whether the UI should use a large model.
     * (Not all UIs will implement this.) Fires a property change
     * for the LARGE_MODEL_PROPERTY.
     * <p>
     * This is a bound property.
     *
     * @param newValue true to suggest a large model to the UI
     * @see #largeModel
     */
    @BeanProperty(description
            = "Whether the UI should use a large model.")
    public void setLargeModel(boolean newValue) {
        boolean                oldValue = largeModel;

        largeModel = newValue;
        firePropertyChange(LARGE_MODEL_PROPERTY, oldValue, newValue);
    }

    
Returns true if the tree is configured for a large model.
See Also:
largeModel
Returns:
true if a large model is suggested/**
     * Returns true if the tree is configured for a large model.
     *
     * @return true if a large model is suggested
     * @see #largeModel
     */
    public boolean isLargeModel() {
        return largeModel;
    }

    
Determines what happens when editing is interrupted by selecting
another node in the tree, a change in the tree's data, or by some
other means. Setting this property to true causes the
changes to be automatically saved when editing is interrupted.

Fires a property change for the INVOKES_STOP_CELL_EDITING_PROPERTY.
Params:
newValue – true means that stopCellEditing is invoked
       when editing is interrupted, and data is saved; false means that
       cancelCellEditing is invoked, and changes are lost/**
     * Determines what happens when editing is interrupted by selecting
     * another node in the tree, a change in the tree's data, or by some
     * other means. Setting this property to <code>true</code> causes the
     * changes to be automatically saved when editing is interrupted.
     * <p>
     * Fires a property change for the INVOKES_STOP_CELL_EDITING_PROPERTY.
     *
     * @param newValue true means that <code>stopCellEditing</code> is invoked
     *        when editing is interrupted, and data is saved; false means that
     *        <code>cancelCellEditing</code> is invoked, and changes are lost
     */
    @BeanProperty(description
            = "Determines what happens when editing is interrupted, selecting another node in the tree, "
            + "a change in the tree's data, or some other means.")
    public void setInvokesStopCellEditing(boolean newValue) {
        boolean                  oldValue = invokesStopCellEditing;

        invokesStopCellEditing = newValue;
        firePropertyChange(INVOKES_STOP_CELL_EDITING_PROPERTY, oldValue,
                           newValue);
    }

    
Returns the indicator that tells what happens when editing is
interrupted.
See Also:
setInvokesStopCellEditing
Returns:
the indicator that tells what happens when editing is
        interrupted/**
     * Returns the indicator that tells what happens when editing is
     * interrupted.
     *
     * @return the indicator that tells what happens when editing is
     *         interrupted
     * @see #setInvokesStopCellEditing
     */
    public boolean getInvokesStopCellEditing() {
        return invokesStopCellEditing;
    }

    
Sets the scrollsOnExpand property,
which determines whether the
tree might scroll to show previously hidden children.
If this property is true (the default),
when a node expands
the tree can use scrolling to make
the maximum possible number of the node's descendants visible.
In some look and feels, trees might not need to scroll when expanded;
those look and feels will ignore this property.

This is a bound property.
Params:
newValue – false to disable scrolling on expansion;
                true to enable it
See Also:
getScrollsOnExpand/**
     * Sets the <code>scrollsOnExpand</code> property,
     * which determines whether the
     * tree might scroll to show previously hidden children.
     * If this property is <code>true</code> (the default),
     * when a node expands
     * the tree can use scrolling to make
     * the maximum possible number of the node's descendants visible.
     * In some look and feels, trees might not need to scroll when expanded;
     * those look and feels will ignore this property.
     * <p>
     * This is a bound property.
     *
     * @param newValue <code>false</code> to disable scrolling on expansion;
     *                 <code>true</code> to enable it
     * @see #getScrollsOnExpand
     */
    @BeanProperty(description
            = "Indicates if a node descendant should be scrolled when expanded.")
    public void setScrollsOnExpand(boolean newValue) {
        boolean           oldValue = scrollsOnExpand;

        scrollsOnExpand = newValue;
        scrollsOnExpandSet = true;
        firePropertyChange(SCROLLS_ON_EXPAND_PROPERTY, oldValue,
                           newValue);
    }

    
Returns the value of the scrollsOnExpand property.
Returns:
the value of the scrollsOnExpand property/**
     * Returns the value of the <code>scrollsOnExpand</code> property.
     *
     * @return the value of the <code>scrollsOnExpand</code> property
     */
    public boolean getScrollsOnExpand() {
        return scrollsOnExpand;
    }

    
Sets the number of mouse clicks before a node will expand or close.
The default is two.

This is a bound property.
Params:
clickCount – the number of mouse clicks to get a node expanded or closed
Since:
1.3/**
     * Sets the number of mouse clicks before a node will expand or close.
     * The default is two.
     * <p>
     * This is a bound property.
     *
     * @param clickCount the number of mouse clicks to get a node expanded or closed
     * @since 1.3
     */
    @BeanProperty(description
            = "Number of clicks before a node will expand/collapse.")
    public void setToggleClickCount(int clickCount) {
        int         oldCount = toggleClickCount;

        toggleClickCount = clickCount;
        firePropertyChange(TOGGLE_CLICK_COUNT_PROPERTY, oldCount,
                           clickCount);
    }

    
Returns the number of mouse clicks needed to expand or close a node.
Returns:
number of mouse clicks before node is expanded
Since:
1.3/**
     * Returns the number of mouse clicks needed to expand or close a node.
     *
     * @return number of mouse clicks before node is expanded
     * @since 1.3
     */
    public int getToggleClickCount() {
        return toggleClickCount;
    }

    
Configures the expandsSelectedPaths property. If
true, any time the selection is changed, either via the
TreeSelectionModel, or the cover methods provided by
JTree, the TreePaths parents will be
expanded to make them visible (visible meaning the parent path is
expanded, not necessarily in the visible rectangle of the
JTree). If false, when the selection
changes the nodes parent is not made visible (all its parents expanded).
This is useful if you wish to have your selection model maintain paths
that are not always visible (all parents expanded).

This is a bound property.
Params:
newValue – the new value for expandsSelectedPaths
Since:
1.3/**
     * Configures the <code>expandsSelectedPaths</code> property. If
     * true, any time the selection is changed, either via the
     * <code>TreeSelectionModel</code>, or the cover methods provided by
     * <code>JTree</code>, the <code>TreePath</code>s parents will be
     * expanded to make them visible (visible meaning the parent path is
     * expanded, not necessarily in the visible rectangle of the
     * <code>JTree</code>). If false, when the selection
     * changes the nodes parent is not made visible (all its parents expanded).
     * This is useful if you wish to have your selection model maintain paths
     * that are not always visible (all parents expanded).
     * <p>
     * This is a bound property.
     *
     * @param newValue the new value for <code>expandsSelectedPaths</code>
     *
     * @since 1.3
     */
    @BeanProperty(description
            = "Indicates whether changes to the selection should make the parent of the path visible.")
    public void setExpandsSelectedPaths(boolean newValue) {
        boolean         oldValue = expandsSelectedPaths;

        expandsSelectedPaths = newValue;
        firePropertyChange(EXPANDS_SELECTED_PATHS_PROPERTY, oldValue,
                           newValue);
    }

    
Returns the expandsSelectedPaths property.
See Also:
setExpandsSelectedPaths
Returns:
true if selection changes result in the parent path being
        expanded
Since:
1.3/**
     * Returns the <code>expandsSelectedPaths</code> property.
     * @return true if selection changes result in the parent path being
     *         expanded
     * @since 1.3
     * @see #setExpandsSelectedPaths
     */
    public boolean getExpandsSelectedPaths() {
        return expandsSelectedPaths;
    }

    
Turns on or off automatic drag handling. In order to enable automatic drag handling, this property should be set to true, and the tree's TransferHandler needs to be non-null. The default value of the dragEnabled property is false. 
 The job of honoring this property, and recognizing a user drag gesture, lies with the look and feel implementation, and in particular, the tree's TreeUI. When automatic drag handling is enabled, most look and feels (including those that subclass BasicLookAndFeel) begin a drag and drop operation whenever the user presses the mouse button over an item and then moves the mouse a few pixels. Setting this property to true can therefore have a subtle effect on how selections behave. 
 If a look and feel is used that ignores this property, you can still begin a drag and drop operation by calling exportAsDrag on the tree's TransferHandler. 
Params:
b – whether or not to enable automatic drag handling
Throws:
HeadlessException – if
           b is true and
           GraphicsEnvironment.isHeadless()
           returns true
See Also:
GraphicsEnvironment.isHeadless
getDragEnabled
JComponent.setTransferHandler
TransferHandler
Since:
1.4/**
     * Turns on or off automatic drag handling. In order to enable automatic
     * drag handling, this property should be set to {@code true}, and the
     * tree's {@code TransferHandler} needs to be {@code non-null}.
     * The default value of the {@code dragEnabled} property is {@code false}.
     * <p>
     * The job of honoring this property, and recognizing a user drag gesture,
     * lies with the look and feel implementation, and in particular, the tree's
     * {@code TreeUI}. When automatic drag handling is enabled, most look and
     * feels (including those that subclass {@code BasicLookAndFeel}) begin a
     * drag and drop operation whenever the user presses the mouse button over
     * an item and then moves the mouse a few pixels. Setting this property to
     * {@code true} can therefore have a subtle effect on how selections behave.
     * <p>
     * If a look and feel is used that ignores this property, you can still
     * begin a drag and drop operation by calling {@code exportAsDrag} on the
     * tree's {@code TransferHandler}.
     *
     * @param b whether or not to enable automatic drag handling
     * @exception HeadlessException if
     *            <code>b</code> is <code>true</code> and
     *            <code>GraphicsEnvironment.isHeadless()</code>
     *            returns <code>true</code>
     * @see java.awt.GraphicsEnvironment#isHeadless
     * @see #getDragEnabled
     * @see #setTransferHandler
     * @see TransferHandler
     * @since 1.4
     */
    @BeanProperty(bound = false, description
            = "determines whether automatic drag handling is enabled")
    public void setDragEnabled(boolean b) {
        checkDragEnabled(b);
        dragEnabled = b;
    }

    private static void checkDragEnabled(boolean b) {
        if (b && GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException();
        }
    }

    
Returns whether or not automatic drag handling is enabled.
See Also:
setDragEnabled
Returns:
the value of the dragEnabled property
Since:
1.4/**
     * Returns whether or not automatic drag handling is enabled.
     *
     * @return the value of the {@code dragEnabled} property
     * @see #setDragEnabled
     * @since 1.4
     */
    public boolean getDragEnabled() {
        return dragEnabled;
    }

    
Sets the drop mode for this component. For backward compatibility,
the default for this property is DropMode.USE_SELECTION.
Usage of one of the other modes is recommended, however, for an
improved user experience. DropMode.ON, for instance,
offers similar behavior of showing items as selected, but does so without
affecting the actual selection in the tree.

JTree supports the following drop modes:

   
DropMode.USE_SELECTION
   
DropMode.ON
   
DropMode.INSERT
   
DropMode.ON_OR_INSERT


The drop mode is only meaningful if this component has a
TransferHandler that accepts drops.
Params:
dropMode – the drop mode to use
Throws:
IllegalArgumentException – if the drop mode is unsupported
        or null
See Also:
getDropMode
getDropLocation
JComponent.setTransferHandler
TransferHandler
Since:
1.6/**
     * Sets the drop mode for this component. For backward compatibility,
     * the default for this property is <code>DropMode.USE_SELECTION</code>.
     * Usage of one of the other modes is recommended, however, for an
     * improved user experience. <code>DropMode.ON</code>, for instance,
     * offers similar behavior of showing items as selected, but does so without
     * affecting the actual selection in the tree.
     * <p>
     * <code>JTree</code> supports the following drop modes:
     * <ul>
     *    <li><code>DropMode.USE_SELECTION</code></li>
     *    <li><code>DropMode.ON</code></li>
     *    <li><code>DropMode.INSERT</code></li>
     *    <li><code>DropMode.ON_OR_INSERT</code></li>
     * </ul>
     * <p>
     * The drop mode is only meaningful if this component has a
     * <code>TransferHandler</code> that accepts drops.
     *
     * @param dropMode the drop mode to use
     * @throws IllegalArgumentException if the drop mode is unsupported
     *         or <code>null</code>
     * @see #getDropMode
     * @see #getDropLocation
     * @see #setTransferHandler
     * @see TransferHandler
     * @since 1.6
     */
    public final void setDropMode(DropMode dropMode) {
        checkDropMode(dropMode);
        this.dropMode = dropMode;
    }

    private static void checkDropMode(DropMode dropMode) {
        if (dropMode != null) {
            switch (dropMode) {
                case USE_SELECTION:
                case ON:
                case INSERT:
                case ON_OR_INSERT:
                    return;
            }
        }

        throw new IllegalArgumentException(dropMode +
                ": Unsupported drop mode for tree");
    }

    
Returns the drop mode for this component.
See Also:
setDropMode
Returns:
the drop mode for this component
Since:
1.6/**
     * Returns the drop mode for this component.
     *
     * @return the drop mode for this component
     * @see #setDropMode
     * @since 1.6
     */
    public final DropMode getDropMode() {
        return dropMode;
    }

    
Calculates a drop location in this component, representing where a
drop at the given point should insert data.
Params:
p – the point to calculate a drop location for
Returns:
the drop location, or null/**
     * Calculates a drop location in this component, representing where a
     * drop at the given point should insert data.
     *
     * @param p the point to calculate a drop location for
     * @return the drop location, or <code>null</code>
     */
    DropLocation dropLocationForPoint(Point p) {
        DropLocation location = null;

        int row = getClosestRowForLocation(p.x, p.y);
        Rectangle bounds = getRowBounds(row);
        TreeModel model = getModel();
        Object root = (model == null) ? null : model.getRoot();
        TreePath rootPath = (root == null) ? null : new TreePath(root);

        TreePath child;
        TreePath parent;
        boolean outside = row == -1
                          || p.y < bounds.y
                          || p.y >= bounds.y + bounds.height;

        switch(dropMode) {
            case USE_SELECTION:
            case ON:
                if (outside) {
                    location = new DropLocation(p, null, -1);
                } else {
                    location = new DropLocation(p, getPathForRow(row), -1);
                }

                break;
            case INSERT:
            case ON_OR_INSERT:
                if (row == -1) {
                    if (root != null && !model.isLeaf(root) && isExpanded(rootPath)) {
                        location = new DropLocation(p, rootPath, 0);
                    } else {
                        location = new DropLocation(p, null, -1);
                    }

                    break;
                }

                boolean checkOn = dropMode == DropMode.ON_OR_INSERT
                                  || !model.isLeaf(getPathForRow(row).getLastPathComponent());

                Section section = SwingUtilities2.liesInVertical(bounds, p, checkOn);
                if(section == LEADING) {
                    child = getPathForRow(row);
                    parent = child.getParentPath();
                } else if (section == TRAILING) {
                    int index = row + 1;
                    if (index >= getRowCount()) {
                        if (model.isLeaf(root) || !isExpanded(rootPath)) {
                            location = new DropLocation(p, null, -1);
                        } else {
                            parent = rootPath;
                            index = model.getChildCount(root);
                            location = new DropLocation(p, parent, index);
                        }

                        break;
                    }

                    child = getPathForRow(index);
                    parent = child.getParentPath();
                    TreePath prev = getPathForRow(row).getParentPath();
                    if (prev != null && !prev.equals(parent)) {
                        location = new DropLocation(p, prev,
                              model.getChildCount(prev.getLastPathComponent()));
                        break;
                    }

                } else {
                    assert checkOn;
                    location = new DropLocation(p, getPathForRow(row), -1);
                    break;
                }

                if (parent != null) {
                    location = new DropLocation(p, parent,
                        model.getIndexOfChild(parent.getLastPathComponent(),
                                              child.getLastPathComponent()));
                } else if (checkOn || !model.isLeaf(root)) {
                    location = new DropLocation(p, rootPath, -1);
                } else {
                    location = new DropLocation(p, null, -1);
                }

                break;
            default:
                assert false : "Unexpected drop mode";
        }

        if (outside || row != expandRow) {
            cancelDropTimer();
        }

        if (!outside && row != expandRow) {
            if (isCollapsed(row)) {
                expandRow = row;
                startDropTimer();
            }
        }

        return location;
    }

    
Called to set or clear the drop location during a DnD operation.
In some cases, the component may need to use it's internal selection
temporarily to indicate the drop location. To help facilitate this,
this method returns and accepts as a parameter a state object.
This state object can be used to store, and later restore, the selection
state. Whatever this method returns will be passed back to it in
future calls, as the state parameter. If it wants the DnD system to
continue storing the same state, it must pass it back every time.
Here's how this is used:

Let's say that on the first call to this method the component decides
to save some state (because it is about to use the selection to show
a drop index). It can return a state object to the caller encapsulating
any saved selection state. On a second call, let's say the drop location
is being changed to something else. The component doesn't need to
restore anything yet, so it simply passes back the same state object
to have the DnD system continue storing it. Finally, let's say this
method is messaged with null. This means DnD
is finished with this component for now, meaning it should restore
state. At this point, it can use the state parameter to restore
said state, and of course return null since there's
no longer anything to store.
Params:
location – the drop location (as calculated by
       dropLocationForPoint) or null
       if there's no longer a valid drop location
state – the state object saved earlier for this component,
       or null
forDrop – whether or not the method is being called because an
       actual drop occurred
Returns:
any saved state for this component, or null if none/**
     * Called to set or clear the drop location during a DnD operation.
     * In some cases, the component may need to use it's internal selection
     * temporarily to indicate the drop location. To help facilitate this,
     * this method returns and accepts as a parameter a state object.
     * This state object can be used to store, and later restore, the selection
     * state. Whatever this method returns will be passed back to it in
     * future calls, as the state parameter. If it wants the DnD system to
     * continue storing the same state, it must pass it back every time.
     * Here's how this is used:
     * <p>
     * Let's say that on the first call to this method the component decides
     * to save some state (because it is about to use the selection to show
     * a drop index). It can return a state object to the caller encapsulating
     * any saved selection state. On a second call, let's say the drop location
     * is being changed to something else. The component doesn't need to
     * restore anything yet, so it simply passes back the same state object
     * to have the DnD system continue storing it. Finally, let's say this
     * method is messaged with <code>null</code>. This means DnD
     * is finished with this component for now, meaning it should restore
     * state. At this point, it can use the state parameter to restore
     * said state, and of course return <code>null</code> since there's
     * no longer anything to store.
     *
     * @param location the drop location (as calculated by
     *        <code>dropLocationForPoint</code>) or <code>null</code>
     *        if there's no longer a valid drop location
     * @param state the state object saved earlier for this component,
     *        or <code>null</code>
     * @param forDrop whether or not the method is being called because an
     *        actual drop occurred
     * @return any saved state for this component, or <code>null</code> if none
     */
    Object setDropLocation(TransferHandler.DropLocation location,
                           Object state,
                           boolean forDrop) {

        Object retVal = null;
        DropLocation treeLocation = (DropLocation)location;

        if (dropMode == DropMode.USE_SELECTION) {
            if (treeLocation == null) {
                if (!forDrop && state != null) {
                    setSelectionPaths(((TreePath[][])state)[0]);
                    setAnchorSelectionPath(((TreePath[][])state)[1][0]);
                    setLeadSelectionPath(((TreePath[][])state)[1][1]);
                }
            } else {
                if (dropLocation == null) {
                    TreePath[] paths = getSelectionPaths();
                    if (paths == null) {
                        paths = new TreePath[0];
                    }

                    retVal = new TreePath[][] {paths,
                            {getAnchorSelectionPath(), getLeadSelectionPath()}};
                } else {
                    retVal = state;
                }

                setSelectionPath(treeLocation.getPath());
            }
        }

        DropLocation old = dropLocation;
        dropLocation = treeLocation;
        firePropertyChange("dropLocation", old, dropLocation);

        return retVal;
    }

    
Called to indicate to this component that DnD is done.
Allows for us to cancel the expand timer.
/**
     * Called to indicate to this component that DnD is done.
     * Allows for us to cancel the expand timer.
     */
    void dndDone() {
        cancelDropTimer();
        dropTimer = null;
    }

    
Returns the location that this component should visually indicate as the drop location during a DnD operation over the component, or null if no location is to currently be shown. 
 This method is not meant for querying the drop location from a TransferHandler, as the drop location is only set after the TransferHandler's canImport
has returned and has allowed for the location to be shown.

When this property changes, a property change event with
name "dropLocation" is fired by the component.
See Also:
setDropMode
TransferHandler.canImport(TransferSupport)
Returns:
the drop location
Since:
1.6/**
     * Returns the location that this component should visually indicate
     * as the drop location during a DnD operation over the component,
     * or {@code null} if no location is to currently be shown.
     * <p>
     * This method is not meant for querying the drop location
     * from a {@code TransferHandler}, as the drop location is only
     * set after the {@code TransferHandler}'s <code>canImport</code>
     * has returned and has allowed for the location to be shown.
     * <p>
     * When this property changes, a property change event with
     * name "dropLocation" is fired by the component.
     *
     * @return the drop location
     * @see #setDropMode
     * @see TransferHandler#canImport(TransferHandler.TransferSupport)
     * @since 1.6
     */
    @BeanProperty(bound = false)
    public final DropLocation getDropLocation() {
        return dropLocation;
    }

    private void startDropTimer() {
        if (dropTimer == null) {
            dropTimer = new TreeTimer();
        }
        dropTimer.start();
    }

    private void cancelDropTimer() {
        if (dropTimer != null && dropTimer.isRunning()) {
            expandRow = -1;
            dropTimer.stop();
        }
    }

    
Returns isEditable. This is invoked from the UI before
editing begins to insure that the given path can be edited. This
is provided as an entry point for subclassers to add filtered
editing without having to resort to creating a new editor.
Params:
path – a TreePath identifying a node
See Also:
isEditable
Returns:
true if every parent node and the node itself is editable/**
     * Returns <code>isEditable</code>. This is invoked from the UI before
     * editing begins to insure that the given path can be edited. This
     * is provided as an entry point for subclassers to add filtered
     * editing without having to resort to creating a new editor.
     *
     * @param path a {@code TreePath} identifying a node
     * @return true if every parent node and the node itself is editable
     * @see #isEditable
     */
    public boolean isPathEditable(TreePath path) {
        return isEditable();
    }

    
Overrides JComponent's getToolTipText
method in order to allow
renderer's tips to be used if it has text set.

NOTE: For JTree to properly display tooltips of its
renderers, JTree must be a registered component with the
ToolTipManager.  This can be done by invoking
ToolTipManager.sharedInstance().registerComponent(tree).
This is not done automatically!
Params:
event – the MouseEvent that initiated the
         ToolTip display
Returns:
a string containing the  tooltip or null
         if event is null/**
     * Overrides <code>JComponent</code>'s <code>getToolTipText</code>
     * method in order to allow
     * renderer's tips to be used if it has text set.
     * <p>
     * NOTE: For <code>JTree</code> to properly display tooltips of its
     * renderers, <code>JTree</code> must be a registered component with the
     * <code>ToolTipManager</code>.  This can be done by invoking
     * <code>ToolTipManager.sharedInstance().registerComponent(tree)</code>.
     * This is not done automatically!
     *
     * @param event the <code>MouseEvent</code> that initiated the
     *          <code>ToolTip</code> display
     * @return a string containing the  tooltip or <code>null</code>
     *          if <code>event</code> is null
     */
    public String getToolTipText(MouseEvent event) {
        String tip = null;

        if(event != null) {
            Point p = event.getPoint();
            int selRow = getRowForLocation(p.x, p.y);
            TreeCellRenderer       r = getCellRenderer();

            if(selRow != -1 && r != null) {
                TreePath     path = getPathForRow(selRow);
                Object       lastPath = path.getLastPathComponent();
                Component    rComponent = r.getTreeCellRendererComponent
                    (this, lastPath, isRowSelected(selRow),
                     isExpanded(selRow), getModel().isLeaf(lastPath), selRow,
                     true);

                if(rComponent instanceof JComponent) {
                    MouseEvent      newEvent;
                    Rectangle       pathBounds = getPathBounds(path);

                    p.translate(-pathBounds.x, -pathBounds.y);
                    @SuppressWarnings("deprecation")
                    final int modifiers = event.getModifiers();
                    newEvent = new MouseEvent(rComponent, event.getID(),
                                          event.getWhen(), modifiers,
                                              p.x, p.y,
                                              event.getXOnScreen(),
                                              event.getYOnScreen(),
                                              event.getClickCount(),
                                              event.isPopupTrigger(),
                                              MouseEvent.NOBUTTON);
                    MouseEventAccessor meAccessor =
                        AWTAccessor.getMouseEventAccessor();
                    meAccessor.setCausedByTouchEvent(newEvent,
                        meAccessor.isCausedByTouchEvent(event));

                    tip = ((JComponent)rComponent).getToolTipText(newEvent);
                }
            }
        }
        // No tip from the renderer get our own tip
        if (tip == null) {
            tip = getToolTipText();
        }
        return tip;
    }

    
Called by the renderers to convert the specified value to
text. This implementation returns value.toString, ignoring
all other arguments. To control the conversion, subclass this
method and use any of the arguments you need.
Params:
value – the Object to convert to text
selected – true if the node is selected
expanded – true if the node is expanded
leaf –  true if the node is a leaf node
row –  an integer specifying the node's display row, where 0 is
            the first row in the display
hasFocus – true if the node has the focus
Returns:
the String representation of the node's value/**
     * Called by the renderers to convert the specified value to
     * text. This implementation returns <code>value.toString</code>, ignoring
     * all other arguments. To control the conversion, subclass this
     * method and use any of the arguments you need.
     *
     * @param value the <code>Object</code> to convert to text
     * @param selected true if the node is selected
     * @param expanded true if the node is expanded
     * @param leaf  true if the node is a leaf node
     * @param row  an integer specifying the node's display row, where 0 is
     *             the first row in the display
     * @param hasFocus true if the node has the focus
     * @return the <code>String</code> representation of the node's value
     */
    public String convertValueToText(Object value, boolean selected,
                                     boolean expanded, boolean leaf, int row,
                                     boolean hasFocus) {
        if(value != null) {
            String sValue = value.toString();
            if (sValue != null) {
                return sValue;
            }
        }
        return "";
    }

    //
    // The following are convenience methods that get forwarded to the
    // current TreeUI.
    //

    
Returns the number of viewable nodes. A node is viewable if all of its parents are expanded. The root is only included in this count if isRootVisible() is true. This returns 0 if the UI has not been set. 
Returns:
the number of viewable nodes/**
     * Returns the number of viewable nodes. A node is viewable if all of its
     * parents are expanded. The root is only included in this count if
     * {@code isRootVisible()} is {@code true}. This returns {@code 0} if
     * the UI has not been set.
     *
     * @return the number of viewable nodes
     */
    @BeanProperty(bound = false)
    public int getRowCount() {
        TreeUI            tree = getUI();

        if(tree != null)
            return tree.getRowCount(this);
        return 0;
    }

    
Selects the node identified by the specified path. If any
component of the path is hidden (under a collapsed node), and
getExpandsSelectedPaths is true it is
exposed (made viewable).
Params:
path – the TreePath specifying the node to select/**
     * Selects the node identified by the specified path. If any
     * component of the path is hidden (under a collapsed node), and
     * <code>getExpandsSelectedPaths</code> is true it is
     * exposed (made viewable).
     *
     * @param path the <code>TreePath</code> specifying the node to select
     */
    public void setSelectionPath(TreePath path) {
        getSelectionModel().setSelectionPath(path);
    }

    
Selects the nodes identified by the specified array of paths.
If any component in any of the paths is hidden (under a collapsed
node), and getExpandsSelectedPaths is true
it is exposed (made viewable).
Params:
paths – an array of TreePath objects that specifies
         the nodes to select/**
     * Selects the nodes identified by the specified array of paths.
     * If any component in any of the paths is hidden (under a collapsed
     * node), and <code>getExpandsSelectedPaths</code> is true
     * it is exposed (made viewable).
     *
     * @param paths an array of <code>TreePath</code> objects that specifies
     *          the nodes to select
     */
    public void setSelectionPaths(TreePath[] paths) {
        getSelectionModel().setSelectionPaths(paths);
    }

    
Sets the path identifies as the lead. The lead may not be selected.
The lead is not maintained by JTree,
rather the UI will update it.

This is a bound property.
Params:
newPath –  the new lead path
Since:
1.3/**
     * Sets the path identifies as the lead. The lead may not be selected.
     * The lead is not maintained by <code>JTree</code>,
     * rather the UI will update it.
     * <p>
     * This is a bound property.
     *
     * @param newPath  the new lead path
     * @since 1.3
     */
    @BeanProperty(description
            = "Lead selection path")
    public void setLeadSelectionPath(TreePath newPath) {
        TreePath          oldValue = leadPath;

        leadPath = newPath;
        firePropertyChange(LEAD_SELECTION_PATH_PROPERTY, oldValue, newPath);

        // Fire the active descendant property change here since the
        // leadPath got set, this is triggered both in case node
        // selection changed and node focus changed
        if (accessibleContext != null){
            ((AccessibleJTree)accessibleContext).
                fireActiveDescendantPropertyChange(oldValue, newPath);
        }
    }

    
Sets the path identified as the anchor.
The anchor is not maintained by JTree, rather the UI will
update it.

This is a bound property.
Params:
newPath –  the new anchor path
Since:
1.3/**
     * Sets the path identified as the anchor.
     * The anchor is not maintained by <code>JTree</code>, rather the UI will
     * update it.
     * <p>
     * This is a bound property.
     *
     * @param newPath  the new anchor path
     * @since 1.3
     */
    @BeanProperty(description
            = "Anchor selection path")
    public void setAnchorSelectionPath(TreePath newPath) {
        TreePath          oldValue = anchorPath;

        anchorPath = newPath;
        firePropertyChange(ANCHOR_SELECTION_PATH_PROPERTY, oldValue, newPath);
    }

    
Selects the node at the specified row in the display.
Params:
row –  the row to select, where 0 is the first row in
            the display/**
     * Selects the node at the specified row in the display.
     *
     * @param row  the row to select, where 0 is the first row in
     *             the display
     */
    public void setSelectionRow(int row) {
        int[]             rows = { row };

        setSelectionRows(rows);
    }

    
Selects the nodes corresponding to each of the specified rows
in the display. If a particular element of rows is
< 0 or >= getRowCount, it will be ignored.
If none of the elements
in rows are valid rows, the selection will
be cleared. That is it will be as if clearSelection
was invoked.
Params:
rows –  an array of ints specifying the rows to select,
             where 0 indicates the first row in the display/**
     * Selects the nodes corresponding to each of the specified rows
     * in the display. If a particular element of <code>rows</code> is
     * &lt; 0 or &gt;= <code>getRowCount</code>, it will be ignored.
     * If none of the elements
     * in <code>rows</code> are valid rows, the selection will
     * be cleared. That is it will be as if <code>clearSelection</code>
     * was invoked.
     *
     * @param rows  an array of ints specifying the rows to select,
     *              where 0 indicates the first row in the display
     */
    public void setSelectionRows(int[] rows) {
        TreeUI               ui = getUI();

        if(ui != null && rows != null) {
            int                  numRows = rows.length;
            TreePath[]           paths = new TreePath[numRows];

            for(int counter = 0; counter < numRows; counter++) {
                paths[counter] = ui.getPathForRow(this, rows[counter]);
            }
            setSelectionPaths(paths);
        }
    }

    
Adds the node identified by the specified TreePath
to the current selection. If any component of the path isn't
viewable, and getExpandsSelectedPaths is true it is
made viewable.

Note that JTree does not allow duplicate nodes to
exist as children under the same parent -- each sibling must be
a unique object.
Params:
path – the TreePath to add/**
     * Adds the node identified by the specified <code>TreePath</code>
     * to the current selection. If any component of the path isn't
     * viewable, and <code>getExpandsSelectedPaths</code> is true it is
     * made viewable.
     * <p>
     * Note that <code>JTree</code> does not allow duplicate nodes to
     * exist as children under the same parent -- each sibling must be
     * a unique object.
     *
     * @param path the <code>TreePath</code> to add
     */
    public void addSelectionPath(TreePath path) {
        getSelectionModel().addSelectionPath(path);
    }

    
Adds each path in the array of paths to the current selection. If
any component of any of the paths isn't viewable and
getExpandsSelectedPaths is true, it is
made viewable.

Note that JTree does not allow duplicate nodes to
exist as children under the same parent -- each sibling must be
a unique object.
Params:
paths – an array of TreePath objects that specifies
         the nodes to add/**
     * Adds each path in the array of paths to the current selection. If
     * any component of any of the paths isn't viewable and
     * <code>getExpandsSelectedPaths</code> is true, it is
     * made viewable.
     * <p>
     * Note that <code>JTree</code> does not allow duplicate nodes to
     * exist as children under the same parent -- each sibling must be
     * a unique object.
     *
     * @param paths an array of <code>TreePath</code> objects that specifies
     *          the nodes to add
     */
    public void addSelectionPaths(TreePath[] paths) {
        getSelectionModel().addSelectionPaths(paths);
    }

    
Adds the path at the specified row to the current selection.
Params:
row –  an integer specifying the row of the node to add,
            where 0 is the first row in the display/**
     * Adds the path at the specified row to the current selection.
     *
     * @param row  an integer specifying the row of the node to add,
     *             where 0 is the first row in the display
     */
    public void addSelectionRow(int row) {
        int[]      rows = { row };

        addSelectionRows(rows);
    }

    
Adds the paths at each of the specified rows to the current selection.
Params:
rows –  an array of ints specifying the rows to add,
             where 0 indicates the first row in the display/**
     * Adds the paths at each of the specified rows to the current selection.
     *
     * @param rows  an array of ints specifying the rows to add,
     *              where 0 indicates the first row in the display
     */
    public void addSelectionRows(int[] rows) {
        TreeUI             ui = getUI();

        if(ui != null && rows != null) {
            int                  numRows = rows.length;
            TreePath[]           paths = new TreePath[numRows];

            for(int counter = 0; counter < numRows; counter++)
                paths[counter] = ui.getPathForRow(this, rows[counter]);
            addSelectionPaths(paths);
        }
    }

    
Returns the last path component of the selected path. This is a convenience method for getSelectionModel().getSelectionPath().getLastPathComponent(). This is typically only useful if the selection has one path. 
See Also:
TreePath.getLastPathComponent
Returns:
the last path component of the selected path, or
        null if nothing is selected/**
     * Returns the last path component of the selected path. This is
     * a convenience method for
     * {@code getSelectionModel().getSelectionPath().getLastPathComponent()}.
     * This is typically only useful if the selection has one path.
     *
     * @return the last path component of the selected path, or
     *         <code>null</code> if nothing is selected
     * @see TreePath#getLastPathComponent
     */
    @BeanProperty(bound = false)
    public Object getLastSelectedPathComponent() {
        TreePath     selPath = getSelectionModel().getSelectionPath();

        if(selPath != null)
            return selPath.getLastPathComponent();
        return null;
    }

    
Returns the path identified as the lead.
Returns:
path identified as the lead/**
     * Returns the path identified as the lead.
     * @return path identified as the lead
     */
    public TreePath getLeadSelectionPath() {
        return leadPath;
    }

    
Returns the path identified as the anchor.
Returns:
path identified as the anchor
Since:
1.3/**
     * Returns the path identified as the anchor.
     * @return path identified as the anchor
     * @since 1.3
     */
    public TreePath getAnchorSelectionPath() {
        return anchorPath;
    }

    
Returns the path to the first selected node.
Returns:
the TreePath for the first selected node,
         or null if nothing is currently selected/**
     * Returns the path to the first selected node.
     *
     * @return the <code>TreePath</code> for the first selected node,
     *          or <code>null</code> if nothing is currently selected
     */
    public TreePath getSelectionPath() {
        return getSelectionModel().getSelectionPath();
    }

    
Returns the paths of all selected values.
Returns:
an array of TreePath objects indicating the selected
        nodes, or null if nothing is currently selected/**
     * Returns the paths of all selected values.
     *
     * @return an array of <code>TreePath</code> objects indicating the selected
     *         nodes, or <code>null</code> if nothing is currently selected
     */
    public TreePath[] getSelectionPaths() {
        TreePath[] selectionPaths = getSelectionModel().getSelectionPaths();

        return (selectionPaths != null && selectionPaths.length > 0) ? selectionPaths : null;
    }

    
Returns all of the currently selected rows. This method is simply
forwarded to the TreeSelectionModel.
If nothing is selected null or an empty array will
be returned, based on the TreeSelectionModel
implementation.
Returns:
an array of integers that identifies all currently selected rows
        where 0 is the first row in the display/**
     * Returns all of the currently selected rows. This method is simply
     * forwarded to the <code>TreeSelectionModel</code>.
     * If nothing is selected <code>null</code> or an empty array will
     * be returned, based on the <code>TreeSelectionModel</code>
     * implementation.
     *
     * @return an array of integers that identifies all currently selected rows
     *         where 0 is the first row in the display
     */
    public int[] getSelectionRows() {
        return getSelectionModel().getSelectionRows();
    }

    
Returns the number of nodes selected.
Returns:
the number of nodes selected/**
     * Returns the number of nodes selected.
     *
     * @return the number of nodes selected
     */
    @BeanProperty(bound = false)
    public int getSelectionCount() {
        return selectionModel.getSelectionCount();
    }

    
Returns the smallest selected row. If the selection is empty, or none of the selected paths are viewable, -1 is returned. 
Returns:
the smallest selected row/**
     * Returns the smallest selected row. If the selection is empty, or
     * none of the selected paths are viewable, {@code -1} is returned.
     *
     * @return the smallest selected row
     */
    @BeanProperty(bound = false)
    public int getMinSelectionRow() {
        return getSelectionModel().getMinSelectionRow();
    }

    
Returns the largest selected row. If the selection is empty, or none of the selected paths are viewable, -1 is returned. 
Returns:
the largest selected row/**
     * Returns the largest selected row. If the selection is empty, or
     * none of the selected paths are viewable, {@code -1} is returned.
     *
     * @return the largest selected row
     */
    @BeanProperty(bound = false)
    public int getMaxSelectionRow() {
        return getSelectionModel().getMaxSelectionRow();
    }

    
Returns the row index corresponding to the lead path.
Returns:
an integer giving the row index of the lead path,
         where 0 is the first row in the display; or -1
         if leadPath is null/**
     * Returns the row index corresponding to the lead path.
     *
     * @return an integer giving the row index of the lead path,
     *          where 0 is the first row in the display; or -1
     *          if <code>leadPath</code> is <code>null</code>
     */
    @BeanProperty(bound = false)
    public int getLeadSelectionRow() {
        TreePath leadPath = getLeadSelectionPath();

        if (leadPath != null) {
            return getRowForPath(leadPath);
        }
        return -1;
    }

    
Returns true if the item identified by the path is currently selected.
Params:
path – a TreePath identifying a node
Returns:
true if the node is selected/**
     * Returns true if the item identified by the path is currently selected.
     *
     * @param path a <code>TreePath</code> identifying a node
     * @return true if the node is selected
     */
    public boolean isPathSelected(TreePath path) {
        return getSelectionModel().isPathSelected(path);
    }

    
Returns true if the node identified by row is selected.
Params:
row –  an integer specifying a display row, where 0 is the first
            row in the display
Returns:
true if the node is selected/**
     * Returns true if the node identified by row is selected.
     *
     * @param row  an integer specifying a display row, where 0 is the first
     *             row in the display
     * @return true if the node is selected
     */
    public boolean isRowSelected(int row) {
        return getSelectionModel().isRowSelected(row);
    }

    
Returns an Enumeration of the descendants of the
path parent that
are currently expanded. If parent is not currently
expanded, this will return null.
If you expand/collapse nodes while
iterating over the returned Enumeration
this may not return all
the expanded paths, or may return paths that are no longer expanded.
Params:
parent –  the path which is to be examined
Returns:
an Enumeration of the descendents of
         parent, or null if
         parent is not currently expanded/**
     * Returns an <code>Enumeration</code> of the descendants of the
     * path <code>parent</code> that
     * are currently expanded. If <code>parent</code> is not currently
     * expanded, this will return <code>null</code>.
     * If you expand/collapse nodes while
     * iterating over the returned <code>Enumeration</code>
     * this may not return all
     * the expanded paths, or may return paths that are no longer expanded.
     *
     * @param parent  the path which is to be examined
     * @return an <code>Enumeration</code> of the descendents of
     *          <code>parent</code>, or <code>null</code> if
     *          <code>parent</code> is not currently expanded
     */
    public Enumeration<TreePath> getExpandedDescendants(TreePath parent) {
        if(!isExpanded(parent))
            return null;

        Enumeration<TreePath> toggledPaths = expandedState.keys();
        Vector<TreePath> elements = null;
        TreePath          path;
        Object            value;

        if(toggledPaths != null) {
            while(toggledPaths.hasMoreElements()) {
                path = toggledPaths.nextElement();
                value = expandedState.get(path);
                // Add the path if it is expanded, a descendant of parent,
                // and it is visible (all parents expanded). This is rather
                // expensive!
                if(path != parent && value != null &&
                   ((Boolean)value).booleanValue() &&
                   parent.isDescendant(path) && isVisible(path)) {
                    if (elements == null) {
                        elements = new Vector<TreePath>();
                    }
                    elements.addElement(path);
                }
            }
        }
        if (elements == null) {
            Set<TreePath> empty = Collections.emptySet();
            return Collections.enumeration(empty);
        }
        return elements.elements();
    }

    
Returns true if the node identified by the path has ever been
expanded.
Params:
path – a TreePath identifying a node
Returns:
true if the path has ever been expanded/**
     * Returns true if the node identified by the path has ever been
     * expanded.
     *
     * @param path a {@code TreePath} identifying a node
     * @return true if the <code>path</code> has ever been expanded
     */
    public boolean hasBeenExpanded(TreePath path) {
        return (path != null && expandedState.get(path) != null);
    }

    
Returns true if the node identified by the path is currently expanded,
Params:
path –  the TreePath specifying the node to check
Returns:
false if any of the nodes in the node's path are collapsed,
              true if all nodes in the path are expanded/**
     * Returns true if the node identified by the path is currently expanded,
     *
     * @param path  the <code>TreePath</code> specifying the node to check
     * @return false if any of the nodes in the node's path are collapsed,
     *               true if all nodes in the path are expanded
     */
    public boolean isExpanded(TreePath path) {

        if(path == null)
            return false;
        Object  value;

        do{
            value = expandedState.get(path);
            if(value == null || !((Boolean)value).booleanValue())
                return false;
        } while( (path=path.getParentPath())!=null );

        return true;
    }

    
Returns true if the node at the specified display row is currently
expanded.
Params:
row –  the row to check, where 0 is the first row in the
            display
Returns:
true if the node is currently expanded, otherwise false/**
     * Returns true if the node at the specified display row is currently
     * expanded.
     *
     * @param row  the row to check, where 0 is the first row in the
     *             display
     * @return true if the node is currently expanded, otherwise false
     */
    public boolean isExpanded(int row) {
        TreeUI                  tree = getUI();

        if(tree != null) {
            TreePath         path = tree.getPathForRow(this, row);

            if(path != null) {
                Boolean value = expandedState.get(path);

                return (value != null && value.booleanValue());
            }
        }
        return false;
    }

    
Returns true if the value identified by path is currently collapsed,
this will return false if any of the values in path are currently
not being displayed.
Params:
path –  the TreePath to check
Returns:
true if any of the nodes in the node's path are collapsed,
              false if all nodes in the path are expanded/**
     * Returns true if the value identified by path is currently collapsed,
     * this will return false if any of the values in path are currently
     * not being displayed.
     *
     * @param path  the <code>TreePath</code> to check
     * @return true if any of the nodes in the node's path are collapsed,
     *               false if all nodes in the path are expanded
     */
    public boolean isCollapsed(TreePath path) {
        return !isExpanded(path);
    }

    
Returns true if the node at the specified display row is collapsed.
Params:
row –  the row to check, where 0 is the first row in the
            display
Returns:
true if the node is currently collapsed, otherwise false/**
     * Returns true if the node at the specified display row is collapsed.
     *
     * @param row  the row to check, where 0 is the first row in the
     *             display
     * @return true if the node is currently collapsed, otherwise false
     */
    public boolean isCollapsed(int row) {
        return !isExpanded(row);
    }

    
Ensures that the node identified by path is currently viewable.
Params:
path –  the TreePath to make visible/**
     * Ensures that the node identified by path is currently viewable.
     *
     * @param path  the <code>TreePath</code> to make visible
     */
    public void makeVisible(TreePath path) {
        if(path != null) {
            TreePath        parentPath = path.getParentPath();

            if(parentPath != null) {
                expandPath(parentPath);
            }
        }
    }

    
Returns true if the value identified by path is currently viewable,
which means it is either the root or all of its parents are expanded.
Otherwise, this method returns false.
Params:
path – TreePath identifying a node
Returns:
true if the node is viewable, otherwise false/**
     * Returns true if the value identified by path is currently viewable,
     * which means it is either the root or all of its parents are expanded.
     * Otherwise, this method returns false.
     *
     * @param path {@code TreePath} identifying a node
     * @return true if the node is viewable, otherwise false
     */
    public boolean isVisible(TreePath path) {
        if(path != null) {
            TreePath        parentPath = path.getParentPath();

            if(parentPath != null)
                return isExpanded(parentPath);
            // Root.
            return true;
        }
        return false;
    }

    
Returns the Rectangle that the specified node will be drawn
into. Returns null if any component in the path is hidden
(under a collapsed parent).

Note:

This method returns a valid rectangle, even if the specified
node is not currently displayed.
Params:
path – the TreePath identifying the node
Returns:
the Rectangle the node is drawn in,
         or null/**
     * Returns the <code>Rectangle</code> that the specified node will be drawn
     * into. Returns <code>null</code> if any component in the path is hidden
     * (under a collapsed parent).
     * <p>
     * Note:<br>
     * This method returns a valid rectangle, even if the specified
     * node is not currently displayed.
     *
     * @param path the <code>TreePath</code> identifying the node
     * @return the <code>Rectangle</code> the node is drawn in,
     *          or <code>null</code>
     */
    public Rectangle getPathBounds(TreePath path) {
        TreeUI                   tree = getUI();

        if(tree != null)
            return tree.getPathBounds(this, path);
        return null;
    }

    
Returns the Rectangle that the node at the specified row is
drawn in.
Params:
row –  the row to be drawn, where 0 is the first row in the
            display
Returns:
the Rectangle the node is drawn in/**
     * Returns the <code>Rectangle</code> that the node at the specified row is
     * drawn in.
     *
     * @param row  the row to be drawn, where 0 is the first row in the
     *             display
     * @return the <code>Rectangle</code> the node is drawn in
     */
    public Rectangle getRowBounds(int row) {
        return getPathBounds(getPathForRow(row));
    }

    
Makes sure all the path components in path are expanded (except
for the last path component) and scrolls so that the
node identified by the path is displayed. Only works when this
JTree is contained in a JScrollPane.
Params:
path –  the TreePath identifying the node to
         bring into view/**
     * Makes sure all the path components in path are expanded (except
     * for the last path component) and scrolls so that the
     * node identified by the path is displayed. Only works when this
     * <code>JTree</code> is contained in a <code>JScrollPane</code>.
     *
     * @param path  the <code>TreePath</code> identifying the node to
     *          bring into view
     */
    public void scrollPathToVisible(TreePath path) {
        if(path != null) {
            makeVisible(path);

            Rectangle          bounds = getPathBounds(path);

            if(bounds != null) {
                scrollRectToVisible(bounds);
                if (accessibleContext != null) {
                    ((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
                }
            }
        }
    }

    
Scrolls the item identified by row until it is displayed. The minimum
of amount of scrolling necessary to bring the row into view
is performed. Only works when this JTree is contained in a
JScrollPane.
Params:
row –  an integer specifying the row to scroll, where 0 is the
            first row in the display/**
     * Scrolls the item identified by row until it is displayed. The minimum
     * of amount of scrolling necessary to bring the row into view
     * is performed. Only works when this <code>JTree</code> is contained in a
     * <code>JScrollPane</code>.
     *
     * @param row  an integer specifying the row to scroll, where 0 is the
     *             first row in the display
     */
    public void scrollRowToVisible(int row) {
        scrollPathToVisible(getPathForRow(row));
    }

    
Returns the path for the specified row.  If row is not visible, or a TreeUI has not been set, null
is returned.
Params:
row –  an integer specifying a row
Returns:
the TreePath to the specified node,
         null if row < 0
         or row >= getRowCount()/**
     * Returns the path for the specified row.  If <code>row</code> is
     * not visible, or a {@code TreeUI} has not been set, <code>null</code>
     * is returned.
     *
     * @param row  an integer specifying a row
     * @return the <code>TreePath</code> to the specified node,
     *          <code>null</code> if <code>row &lt; 0</code>
     *          or <code>row &gt;= getRowCount()</code>
     */
    @BeanProperty(bound = false)
    public TreePath getPathForRow(int row) {
        TreeUI                  tree = getUI();

        if(tree != null)
            return tree.getPathForRow(this, row);
        return null;
    }

    
Returns the row that displays the node identified by the specified
path.
Params:
path –  the TreePath identifying a node
Returns:
an integer specifying the display row, where 0 is the first
        row in the display, or -1 if any of the elements in path
        are hidden under a collapsed parent./**
     * Returns the row that displays the node identified by the specified
     * path.
     *
     * @param path  the <code>TreePath</code> identifying a node
     * @return an integer specifying the display row, where 0 is the first
     *         row in the display, or -1 if any of the elements in path
     *         are hidden under a collapsed parent.
     */
    public int getRowForPath(TreePath path) {
        TreeUI                  tree = getUI();

        if(tree != null)
            return tree.getRowForPath(this, path);
        return -1;
    }

    
Ensures that the node identified by the specified path is
expanded and viewable. If the last item in the path is a
leaf, this will have no effect.
Params:
path –  the TreePath identifying a node/**
     * Ensures that the node identified by the specified path is
     * expanded and viewable. If the last item in the path is a
     * leaf, this will have no effect.
     *
     * @param path  the <code>TreePath</code> identifying a node
     */
    public void expandPath(TreePath path) {
        // Only expand if not leaf!
        TreeModel          model = getModel();

        if(path != null && model != null &&
           !model.isLeaf(path.getLastPathComponent())) {
            setExpandedState(path, true);
        }
    }

    
Ensures that the node in the specified row is expanded and
viewable.

If row is < 0 or >= getRowCount this
will have no effect.
Params:
row –  an integer specifying a display row, where 0 is the
            first row in the display/**
     * Ensures that the node in the specified row is expanded and
     * viewable.
     * <p>
     * If <code>row</code> is &lt; 0 or &gt;= <code>getRowCount</code> this
     * will have no effect.
     *
     * @param row  an integer specifying a display row, where 0 is the
     *             first row in the display
     */
    public void expandRow(int row) {
        expandPath(getPathForRow(row));
    }

    
Ensures that the node identified by the specified path is
collapsed and viewable.
Params:
path –  the TreePath identifying a node/**
     * Ensures that the node identified by the specified path is
     * collapsed and viewable.
     *
     * @param path  the <code>TreePath</code> identifying a node
      */
    public void collapsePath(TreePath path) {
        setExpandedState(path, false);
    }

    
Ensures that the node in the specified row is collapsed.

If row is < 0 or >= getRowCount this
will have no effect.
Params:
row –  an integer specifying a display row, where 0 is the
            first row in the display/**
     * Ensures that the node in the specified row is collapsed.
     * <p>
     * If <code>row</code> is &lt; 0 or &gt;= <code>getRowCount</code> this
     * will have no effect.
     *
     * @param row  an integer specifying a display row, where 0 is the
     *             first row in the display
      */
    public void collapseRow(int row) {
        collapsePath(getPathForRow(row));
    }

    
Returns the path for the node at the specified location.
Params:
x – an integer giving the number of pixels horizontally from
         the left edge of the display area, minus any left margin
y – an integer giving the number of pixels vertically from
         the top of the display area, minus any top margin
Returns:
 the TreePath for the node at that location/**
     * Returns the path for the node at the specified location.
     *
     * @param x an integer giving the number of pixels horizontally from
     *          the left edge of the display area, minus any left margin
     * @param y an integer giving the number of pixels vertically from
     *          the top of the display area, minus any top margin
     * @return  the <code>TreePath</code> for the node at that location
     */
    public TreePath getPathForLocation(int x, int y) {
        TreePath          closestPath = getClosestPathForLocation(x, y);

        if(closestPath != null) {
            Rectangle       pathBounds = getPathBounds(closestPath);

            if(pathBounds != null &&
               x >= pathBounds.x && x < (pathBounds.x + pathBounds.width) &&
               y >= pathBounds.y && y < (pathBounds.y + pathBounds.height))
                return closestPath;
        }
        return null;
    }

    
Returns the row for the specified location.
Params:
x – an integer giving the number of pixels horizontally from
         the left edge of the display area, minus any left margin
y – an integer giving the number of pixels vertically from
         the top of the display area, minus any top margin
See Also:
getClosestRowForLocation
Returns:
the row corresponding to the location, or -1 if the
        location is not within the bounds of a displayed cell/**
     * Returns the row for the specified location.
     *
     * @param x an integer giving the number of pixels horizontally from
     *          the left edge of the display area, minus any left margin
     * @param y an integer giving the number of pixels vertically from
     *          the top of the display area, minus any top margin
     * @return the row corresponding to the location, or -1 if the
     *         location is not within the bounds of a displayed cell
     * @see #getClosestRowForLocation
     */
    public int getRowForLocation(int x, int y) {
        return getRowForPath(getPathForLocation(x, y));
    }

    
Returns the path to the node that is closest to x,y.  If
no nodes are currently viewable, or there is no model, returns
null, otherwise it always returns a valid path.  To test if
the node is exactly at x, y, get the node's bounds and
test x, y against that.
Params:
x – an integer giving the number of pixels horizontally from
         the left edge of the display area, minus any left margin
y – an integer giving the number of pixels vertically from
         the top of the display area, minus any top margin
See Also:
getPathForLocation
getPathBounds
Returns:
 the TreePath for the node closest to that location,
         null if nothing is viewable or there is no model/**
     * Returns the path to the node that is closest to x,y.  If
     * no nodes are currently viewable, or there is no model, returns
     * <code>null</code>, otherwise it always returns a valid path.  To test if
     * the node is exactly at x, y, get the node's bounds and
     * test x, y against that.
     *
     * @param x an integer giving the number of pixels horizontally from
     *          the left edge of the display area, minus any left margin
     * @param y an integer giving the number of pixels vertically from
     *          the top of the display area, minus any top margin
     * @return  the <code>TreePath</code> for the node closest to that location,
     *          <code>null</code> if nothing is viewable or there is no model
     *
     * @see #getPathForLocation
     * @see #getPathBounds
     */
    public TreePath getClosestPathForLocation(int x, int y) {
        TreeUI                  tree = getUI();

        if(tree != null)
            return tree.getClosestPathForLocation(this, x, y);
        return null;
    }

    
Returns the row to the node that is closest to x,y.  If no nodes
are viewable or there is no model, returns -1. Otherwise,
it always returns a valid row.  To test if the returned object is
exactly at x, y, get the bounds for the node at the returned
row and test x, y against that.
Params:
x – an integer giving the number of pixels horizontally from
         the left edge of the display area, minus any left margin
y – an integer giving the number of pixels vertically from
         the top of the display area, minus any top margin
See Also:
getRowForLocation
getRowBounds
Returns:
the row closest to the location, -1 if nothing is
        viewable or there is no model/**
     * Returns the row to the node that is closest to x,y.  If no nodes
     * are viewable or there is no model, returns -1. Otherwise,
     * it always returns a valid row.  To test if the returned object is
     * exactly at x, y, get the bounds for the node at the returned
     * row and test x, y against that.
     *
     * @param x an integer giving the number of pixels horizontally from
     *          the left edge of the display area, minus any left margin
     * @param y an integer giving the number of pixels vertically from
     *          the top of the display area, minus any top margin
     * @return the row closest to the location, -1 if nothing is
     *         viewable or there is no model
     *
     * @see #getRowForLocation
     * @see #getRowBounds
     */
    public int getClosestRowForLocation(int x, int y) {
        return getRowForPath(getClosestPathForLocation(x, y));
    }

    
Returns true if the tree is being edited. The item that is being
edited can be obtained using getSelectionPath.
See Also:
getSelectionPath
Returns:
true if the user is currently editing a node/**
     * Returns true if the tree is being edited. The item that is being
     * edited can be obtained using <code>getSelectionPath</code>.
     *
     * @return true if the user is currently editing a node
     * @see #getSelectionPath
     */
    @BeanProperty(bound = false)
    public boolean isEditing() {
        TreeUI                  tree = getUI();

        if(tree != null)
            return tree.isEditing(this);
        return false;
    }

    
Ends the current editing session.
(The DefaultTreeCellEditor
object saves any edits that are currently in progress on a cell.
Other implementations may operate differently.)
Has no effect if the tree isn't being edited.

Note:
 To make edit-saves automatic whenever the user changes their position in the tree, use setInvokesStopCellEditing. 
Returns:
true if editing was in progress and is now stopped,
             false if editing was not in progress/**
     * Ends the current editing session.
     * (The <code>DefaultTreeCellEditor</code>
     * object saves any edits that are currently in progress on a cell.
     * Other implementations may operate differently.)
     * Has no effect if the tree isn't being edited.
     * <blockquote>
     * <b>Note:</b><br>
     * To make edit-saves automatic whenever the user changes
     * their position in the tree, use {@link #setInvokesStopCellEditing}.
     * </blockquote>
     *
     * @return true if editing was in progress and is now stopped,
     *              false if editing was not in progress
     */
    public boolean stopEditing() {
        TreeUI                  tree = getUI();

        if(tree != null)
            return tree.stopEditing(this);
        return false;
    }

    
Cancels the current editing session. Has no effect if the
tree isn't being edited.
/**
     * Cancels the current editing session. Has no effect if the
     * tree isn't being edited.
     */
    public void  cancelEditing() {
        TreeUI                  tree = getUI();

        if(tree != null)
            tree.cancelEditing(this);
    }

    
Selects the node identified by the specified path and initiates
editing.  The edit-attempt fails if the CellEditor
does not allow
editing for the specified item.
Params:
path –  the TreePath identifying a node/**
     * Selects the node identified by the specified path and initiates
     * editing.  The edit-attempt fails if the <code>CellEditor</code>
     * does not allow
     * editing for the specified item.
     *
     * @param path  the <code>TreePath</code> identifying a node
     */
    public void startEditingAtPath(TreePath path) {
        TreeUI                  tree = getUI();

        if(tree != null)
            tree.startEditingAtPath(this, path);
    }

    
Returns the path to the element that is currently being edited.
Returns:
 the TreePath for the node being edited/**
     * Returns the path to the element that is currently being edited.
     *
     * @return  the <code>TreePath</code> for the node being edited
     */
    @BeanProperty(bound = false)
    public TreePath getEditingPath() {
        TreeUI                  tree = getUI();

        if(tree != null)
            return tree.getEditingPath(this);
        return null;
    }

    //
    // Following are primarily convenience methods for mapping from
    // row based selections to path selections.  Sometimes it is
    // easier to deal with these than paths (mouse downs, key downs
    // usually just deal with index based selections).
    // Since row based selections require a UI many of these won't work
    // without one.
    //

    
Sets the tree's selection model. When a null value is
specified an empty
selectionModel is used, which does not allow selections.

This is a bound property.
Params:
selectionModel – the TreeSelectionModel to use,
         or null to disable selections
See Also:
TreeSelectionModel/**
     * Sets the tree's selection model. When a <code>null</code> value is
     * specified an empty
     * <code>selectionModel</code> is used, which does not allow selections.
     * <p>
     * This is a bound property.
     *
     * @param selectionModel the <code>TreeSelectionModel</code> to use,
     *          or <code>null</code> to disable selections
     * @see TreeSelectionModel
     */
    @BeanProperty(description
            = "The tree's selection model.")
    public void setSelectionModel(TreeSelectionModel selectionModel) {
        if(selectionModel == null)
            selectionModel = EmptySelectionModel.sharedInstance();

        TreeSelectionModel         oldValue = this.selectionModel;

        if (this.selectionModel != null && selectionRedirector != null) {
            this.selectionModel.removeTreeSelectionListener
                                (selectionRedirector);
        }
        if (accessibleContext != null) {
           this.selectionModel.removeTreeSelectionListener((TreeSelectionListener)accessibleContext);
           selectionModel.addTreeSelectionListener((TreeSelectionListener)accessibleContext);
        }

        this.selectionModel = selectionModel;
        if (selectionRedirector != null) {
            this.selectionModel.addTreeSelectionListener(selectionRedirector);
        }
        firePropertyChange(SELECTION_MODEL_PROPERTY, oldValue,
                           this.selectionModel);

        if (accessibleContext != null) {
            accessibleContext.firePropertyChange(
                    AccessibleContext.ACCESSIBLE_SELECTION_PROPERTY,
                    Boolean.valueOf(false), Boolean.valueOf(true));
        }
    }

    
Returns the model for selections. This should always return a
non-null value. If you don't want to allow anything
to be selected
set the selection model to null, which forces an empty
selection model to be used.
See Also:
setSelectionModel
Returns:
the model for selections/**
     * Returns the model for selections. This should always return a
     * non-<code>null</code> value. If you don't want to allow anything
     * to be selected
     * set the selection model to <code>null</code>, which forces an empty
     * selection model to be used.
     *
     * @return the model for selections
     * @see #setSelectionModel
     */
    public TreeSelectionModel getSelectionModel() {
        return selectionModel;
    }

    
Returns the paths (inclusive) between the specified rows. If the specified indices are within the viewable set of rows, or bound the viewable set of rows, then the indices are constrained by the viewable set of rows. If the specified indices are not within the viewable set of rows, or do not bound the viewable set of rows, then an empty array is returned. For example, if the row count is 10, and this method is invoked with -1, 20, then the specified indices are constrained to the viewable set of rows, and this is treated as if invoked with 0, 9. On the other hand, if this were invoked with -10, -1, then the specified indices do not bound the viewable set of rows, and an empty array is returned. 
 The parameters are not order dependent. That is, 
getPathBetweenRows(x, y) is equivalent to getPathBetweenRows(y, x). 
 An empty array is returned if the row count is 0, or the specified indices do not bound the viewable set of rows. 
Params:
index0 – the first index in the range
index1 – the last index in the range
Returns:
the paths (inclusive) between the specified row indices/**
     * Returns the paths (inclusive) between the specified rows. If
     * the specified indices are within the viewable set of rows, or
     * bound the viewable set of rows, then the indices are
     * constrained by the viewable set of rows. If the specified
     * indices are not within the viewable set of rows, or do not
     * bound the viewable set of rows, then an empty array is
     * returned. For example, if the row count is {@code 10}, and this
     * method is invoked with {@code -1, 20}, then the specified
     * indices are constrained to the viewable set of rows, and this is
     * treated as if invoked with {@code 0, 9}. On the other hand, if
     * this were invoked with {@code -10, -1}, then the specified
     * indices do not bound the viewable set of rows, and an empty
     * array is returned.
     * <p>
     * The parameters are not order dependent. That is, {@code
     * getPathBetweenRows(x, y)} is equivalent to
     * {@code getPathBetweenRows(y, x)}.
     * <p>
     * An empty array is returned if the row count is {@code 0}, or
     * the specified indices do not bound the viewable set of rows.
     *
     * @param index0 the first index in the range
     * @param index1 the last index in the range
     * @return the paths (inclusive) between the specified row indices
     */
    protected TreePath[] getPathBetweenRows(int index0, int index1) {
        TreeUI           tree = getUI();
        if (tree != null) {
            int rowCount = getRowCount();
            if (rowCount > 0 && !((index0 < 0 && index1 < 0) ||
                                  (index0 >= rowCount && index1 >= rowCount))){
                index0 = Math.min(rowCount - 1, Math.max(index0, 0));
                index1 = Math.min(rowCount - 1, Math.max(index1, 0));
                int minIndex = Math.min(index0, index1);
                int maxIndex = Math.max(index0, index1);
                TreePath[] selection = new TreePath[
                        maxIndex - minIndex + 1];
                for(int counter = minIndex; counter <= maxIndex; counter++) {
                    selection[counter - minIndex] =
                            tree.getPathForRow(this, counter);
                }
                return selection;
            }
        }
        return new TreePath[0];
    }

    
Selects the rows in the specified interval (inclusive). If the specified indices are within the viewable set of rows, or bound the viewable set of rows, then the specified rows are constrained by the viewable set of rows. If the specified indices are not within the viewable set of rows, or do not bound the viewable set of rows, then the selection is cleared. For example, if the row count is 
10, and this method is invoked with -1, 20, then the specified indices bounds the viewable range, and this is treated as if invoked with 0, 9. On the other hand, if this were invoked with -10, -1, then the specified indices do not bound the viewable set of rows, and the selection is cleared. 
 The parameters are not order dependent. That is, 
setSelectionInterval(x, y) is equivalent to setSelectionInterval(y, x). 
Params:
index0 – the first index in the range to select
index1 – the last index in the range to select/**
     * Selects the rows in the specified interval (inclusive). If
     * the specified indices are within the viewable set of rows, or bound
     * the viewable set of rows, then the specified rows are constrained by
     * the viewable set of rows. If the specified indices are not within the
     * viewable set of rows, or do not bound the viewable set of rows, then
     * the selection is cleared. For example, if the row count is {@code
     * 10}, and this method is invoked with {@code -1, 20}, then the
     * specified indices bounds the viewable range, and this is treated as
     * if invoked with {@code 0, 9}. On the other hand, if this were
     * invoked with {@code -10, -1}, then the specified indices do not
     * bound the viewable set of rows, and the selection is cleared.
     * <p>
     * The parameters are not order dependent. That is, {@code
     * setSelectionInterval(x, y)} is equivalent to
     * {@code setSelectionInterval(y, x)}.
     *
     * @param index0 the first index in the range to select
     * @param index1 the last index in the range to select
    */
    public void setSelectionInterval(int index0, int index1) {
        TreePath[]         paths = getPathBetweenRows(index0, index1);

        this.getSelectionModel().setSelectionPaths(paths);
    }

    
Adds the specified rows (inclusive) to the selection. If the specified indices are within the viewable set of rows, or bound the viewable set of rows, then the specified indices are constrained by the viewable set of rows. If the indices are not within the viewable set of rows, or do not bound the viewable set of rows, then the selection is unchanged. For example, if the row count is 10, and this method is invoked with -1, 20, then the specified indices bounds the viewable range, and this is treated as if invoked with 0, 9. On the other hand, if this were invoked with -10, -1, then the specified indices do not bound the viewable set of rows, and the selection is unchanged. 
 The parameters are not order dependent. That is, 
addSelectionInterval(x, y) is equivalent to addSelectionInterval(y, x). 
Params:
index0 – the first index in the range to add to the selection
index1 – the last index in the range to add to the selection/**
     * Adds the specified rows (inclusive) to the selection. If the
     * specified indices are within the viewable set of rows, or bound
     * the viewable set of rows, then the specified indices are
     * constrained by the viewable set of rows. If the indices are not
     * within the viewable set of rows, or do not bound the viewable
     * set of rows, then the selection is unchanged. For example, if
     * the row count is {@code 10}, and this method is invoked with
     * {@code -1, 20}, then the specified indices bounds the viewable
     * range, and this is treated as if invoked with {@code 0, 9}. On
     * the other hand, if this were invoked with {@code -10, -1}, then
     * the specified indices do not bound the viewable set of rows,
     * and the selection is unchanged.
     * <p>
     * The parameters are not order dependent. That is, {@code
     * addSelectionInterval(x, y)} is equivalent to
     * {@code addSelectionInterval(y, x)}.
     *
     * @param index0 the first index in the range to add to the selection
     * @param index1 the last index in the range to add to the selection
     */
    public void addSelectionInterval(int index0, int index1) {
        TreePath[]         paths = getPathBetweenRows(index0, index1);

        if (paths != null && paths.length > 0) {
            this.getSelectionModel().addSelectionPaths(paths);
        }
    }

    
Removes the specified rows (inclusive) from the selection. If the specified indices are within the viewable set of rows, or bound the viewable set of rows, then the specified indices are constrained by the viewable set of rows. If the specified indices are not within the viewable set of rows, or do not bound the viewable set of rows, then the selection is unchanged. For example, if the row count is 
10, and this method is invoked with -1, 20, then the specified range bounds the viewable range, and this is treated as if invoked with 0, 9. On the other hand, if this were invoked with -10, -1, then the specified range does not bound the viewable set of rows, and the selection is unchanged. 
 The parameters are not order dependent. That is, 
removeSelectionInterval(x, y) is equivalent to removeSelectionInterval(y, x). 
Params:
index0 – the first row to remove from the selection
index1 – the last row to remove from the selection/**
     * Removes the specified rows (inclusive) from the selection. If
     * the specified indices are within the viewable set of rows, or bound
     * the viewable set of rows, then the specified indices are constrained by
     * the viewable set of rows. If the specified indices are not within the
     * viewable set of rows, or do not bound the viewable set of rows, then
     * the selection is unchanged. For example, if the row count is {@code
     * 10}, and this method is invoked with {@code -1, 20}, then the
     * specified range bounds the viewable range, and this is treated as
     * if invoked with {@code 0, 9}. On the other hand, if this were
     * invoked with {@code -10, -1}, then the specified range does not
     * bound the viewable set of rows, and the selection is unchanged.
     * <p>
     * The parameters are not order dependent. That is, {@code
     * removeSelectionInterval(x, y)} is equivalent to
     * {@code removeSelectionInterval(y, x)}.
     *
     * @param index0 the first row to remove from the selection
     * @param index1 the last row to remove from the selection
     */
    public void removeSelectionInterval(int index0, int index1) {
        TreePath[]         paths = getPathBetweenRows(index0, index1);

        if (paths != null && paths.length > 0) {
            this.getSelectionModel().removeSelectionPaths(paths);
        }
    }

    
Removes the node identified by the specified path from the current
selection.
Params:
path –  the TreePath identifying a node/**
     * Removes the node identified by the specified path from the current
     * selection.
     *
     * @param path  the <code>TreePath</code> identifying a node
     */
    public void removeSelectionPath(TreePath path) {
        this.getSelectionModel().removeSelectionPath(path);
    }

    
Removes the nodes identified by the specified paths from the
current selection.
Params:
paths – an array of TreePath objects that
             specifies the nodes to remove/**
     * Removes the nodes identified by the specified paths from the
     * current selection.
     *
     * @param paths an array of <code>TreePath</code> objects that
     *              specifies the nodes to remove
     */
    public void removeSelectionPaths(TreePath[] paths) {
        this.getSelectionModel().removeSelectionPaths(paths);
    }

    
Removes the row at the index row from the current
selection.
Params:
row –  the row to remove/**
     * Removes the row at the index <code>row</code> from the current
     * selection.
     *
     * @param row  the row to remove
     */
    public void removeSelectionRow(int row) {
        int[]             rows = { row };

        removeSelectionRows(rows);
    }

    
Removes the rows that are selected at each of the specified
rows.
Params:
rows –  an array of ints specifying display rows, where 0 is
            the first row in the display/**
     * Removes the rows that are selected at each of the specified
     * rows.
     *
     * @param rows  an array of ints specifying display rows, where 0 is
     *             the first row in the display
     */
    public void removeSelectionRows(int[] rows) {
        TreeUI             ui = getUI();

        if(ui != null && rows != null) {
            int                  numRows = rows.length;
            TreePath[]           paths = new TreePath[numRows];

            for(int counter = 0; counter < numRows; counter++)
                paths[counter] = ui.getPathForRow(this, rows[counter]);
            removeSelectionPaths(paths);
        }
    }

    
Clears the selection.
/**
     * Clears the selection.
     */
    public void clearSelection() {
        getSelectionModel().clearSelection();
    }

    
Returns true if the selection is currently empty.
Returns:
true if the selection is currently empty/**
     * Returns true if the selection is currently empty.
     *
     * @return true if the selection is currently empty
     */
    @BeanProperty(bound = false)
    public boolean isSelectionEmpty() {
        return getSelectionModel().isSelectionEmpty();
    }

    
Adds a listener for TreeExpansion events.
Params:
tel – a TreeExpansionListener that will be notified when
           a tree node is expanded or collapsed (a "negative
           expansion")/**
     * Adds a listener for <code>TreeExpansion</code> events.
     *
     * @param tel a TreeExpansionListener that will be notified when
     *            a tree node is expanded or collapsed (a "negative
     *            expansion")
     */
    public void addTreeExpansionListener(TreeExpansionListener tel) {
        if (settingUI) {
            uiTreeExpansionListener = tel;
        }
        listenerList.add(TreeExpansionListener.class, tel);
    }

    
Removes a listener for TreeExpansion events.
Params:
tel – the TreeExpansionListener to remove/**
     * Removes a listener for <code>TreeExpansion</code> events.
     *
     * @param tel the <code>TreeExpansionListener</code> to remove
     */
    public void removeTreeExpansionListener(TreeExpansionListener tel) {
        listenerList.remove(TreeExpansionListener.class, tel);
        if (uiTreeExpansionListener == tel) {
            uiTreeExpansionListener = null;
        }
    }

    
Returns an array of all the TreeExpansionListeners added
to this JTree with addTreeExpansionListener().
Returns:
all of the TreeExpansionListeners added or an empty
        array if no listeners have been added
Since:
1.4/**
     * Returns an array of all the <code>TreeExpansionListener</code>s added
     * to this JTree with addTreeExpansionListener().
     *
     * @return all of the <code>TreeExpansionListener</code>s added or an empty
     *         array if no listeners have been added
     * @since 1.4
     */
    @BeanProperty(bound = false)
    public TreeExpansionListener[] getTreeExpansionListeners() {
        return listenerList.getListeners(TreeExpansionListener.class);
    }

    
Adds a listener for TreeWillExpand events.
Params:
tel – a TreeWillExpandListener that will be notified
           when a tree node will be expanded or collapsed (a "negative
           expansion")/**
     * Adds a listener for <code>TreeWillExpand</code> events.
     *
     * @param tel a <code>TreeWillExpandListener</code> that will be notified
     *            when a tree node will be expanded or collapsed (a "negative
     *            expansion")
     */
    public void addTreeWillExpandListener(TreeWillExpandListener tel) {
        listenerList.add(TreeWillExpandListener.class, tel);
    }

    
Removes a listener for TreeWillExpand events.
Params:
tel – the TreeWillExpandListener to remove/**
     * Removes a listener for <code>TreeWillExpand</code> events.
     *
     * @param tel the <code>TreeWillExpandListener</code> to remove
     */
    public void removeTreeWillExpandListener(TreeWillExpandListener tel) {
        listenerList.remove(TreeWillExpandListener.class, tel);
    }

    
Returns an array of all the TreeWillExpandListeners added
to this JTree with addTreeWillExpandListener().
Returns:
all of the TreeWillExpandListeners added or an empty
        array if no listeners have been added
Since:
1.4/**
     * Returns an array of all the <code>TreeWillExpandListener</code>s added
     * to this JTree with addTreeWillExpandListener().
     *
     * @return all of the <code>TreeWillExpandListener</code>s added or an empty
     *         array if no listeners have been added
     * @since 1.4
     */
    @BeanProperty(bound = false)
    public TreeWillExpandListener[] getTreeWillExpandListeners() {
        return listenerList.getListeners(TreeWillExpandListener.class);
    }

    
Notifies all listeners that have registered interest for
notification on this event type.  The event instance
is lazily created using the path parameter.
Params:
path – the TreePath indicating the node that was
         expanded
See Also:
EventListenerList/**
     * Notifies all listeners that have registered interest for
     * notification on this event type.  The event instance
     * is lazily created using the <code>path</code> parameter.
     *
     * @param path the <code>TreePath</code> indicating the node that was
     *          expanded
     * @see EventListenerList
     */
     public void fireTreeExpanded(TreePath path) {
        // Guaranteed to return a non-null array
        Object[] listeners = listenerList.getListenerList();
        TreeExpansionEvent e = null;
        if (uiTreeExpansionListener != null) {
            e = new TreeExpansionEvent(this, path);
            uiTreeExpansionListener.treeExpanded(e);
        }
        // Process the listeners last to first, notifying
        // those that are interested in this event
        for (int i = listeners.length-2; i>=0; i-=2) {
            if (listeners[i]==TreeExpansionListener.class &&
                listeners[i + 1] != uiTreeExpansionListener) {
                // Lazily create the event:
                if (e == null)
                    e = new TreeExpansionEvent(this, path);
                ((TreeExpansionListener)listeners[i+1]).
                    treeExpanded(e);
            }
        }
    }

    
Notifies all listeners that have registered interest for
notification on this event type.  The event instance
is lazily created using the path parameter.
Params:
path – the TreePath indicating the node that was
         collapsed
See Also:
EventListenerList/**
     * Notifies all listeners that have registered interest for
     * notification on this event type.  The event instance
     * is lazily created using the <code>path</code> parameter.
     *
     * @param path the <code>TreePath</code> indicating the node that was
     *          collapsed
     * @see EventListenerList
     */
    public void fireTreeCollapsed(TreePath path) {
        // Guaranteed to return a non-null array
        Object[] listeners = listenerList.getListenerList();
        TreeExpansionEvent e = null;
        if (uiTreeExpansionListener != null) {
            e = new TreeExpansionEvent(this, path);
            uiTreeExpansionListener.treeCollapsed(e);
        }
        // Process the listeners last to first, notifying
        // those that are interested in this event
        for (int i = listeners.length-2; i>=0; i-=2) {
            if (listeners[i]==TreeExpansionListener.class &&
                listeners[i + 1] != uiTreeExpansionListener) {
                // Lazily create the event:
                if (e == null)
                    e = new TreeExpansionEvent(this, path);
                ((TreeExpansionListener)listeners[i+1]).
                    treeCollapsed(e);
            }
        }
    }

    
Notifies all listeners that have registered interest for
notification on this event type.  The event instance
is lazily created using the path parameter.
Params:
path – the TreePath indicating the node that was
         expanded
Throws:
ExpandVetoException – if the expansion is prevented from occurring
See Also:
EventListenerList/**
     * Notifies all listeners that have registered interest for
     * notification on this event type.  The event instance
     * is lazily created using the <code>path</code> parameter.
     *
     * @param path the <code>TreePath</code> indicating the node that was
     *          expanded
     * @throws ExpandVetoException if the expansion is prevented from occurring
     * @see EventListenerList
     */
     public void fireTreeWillExpand(TreePath path) throws ExpandVetoException {
        // Guaranteed to return a non-null array
        Object[] listeners = listenerList.getListenerList();
        TreeExpansionEvent e = null;
        // Process the listeners last to first, notifying
        // those that are interested in this event
        for (int i = listeners.length-2; i>=0; i-=2) {
            if (listeners[i]==TreeWillExpandListener.class) {
                // Lazily create the event:
                if (e == null)
                    e = new TreeExpansionEvent(this, path);
                ((TreeWillExpandListener)listeners[i+1]).
                    treeWillExpand(e);
            }
        }
    }

    
Notifies all listeners that have registered interest for
notification on this event type.  The event instance
is lazily created using the path parameter.
Params:
path – the TreePath indicating the node that was
         expanded
Throws:
ExpandVetoException – if the collapse is prevented from occurring
See Also:
EventListenerList/**
     * Notifies all listeners that have registered interest for
     * notification on this event type.  The event instance
     * is lazily created using the <code>path</code> parameter.
     *
     * @param path the <code>TreePath</code> indicating the node that was
     *          expanded
     * @throws ExpandVetoException if the collapse is prevented from occurring
     * @see EventListenerList
     */
     public void fireTreeWillCollapse(TreePath path) throws ExpandVetoException {
        // Guaranteed to return a non-null array
        Object[] listeners = listenerList.getListenerList();
        TreeExpansionEvent e = null;
        // Process the listeners last to first, notifying
        // those that are interested in this event
        for (int i = listeners.length-2; i>=0; i-=2) {
            if (listeners[i]==TreeWillExpandListener.class) {
                // Lazily create the event:
                if (e == null)
                    e = new TreeExpansionEvent(this, path);
                ((TreeWillExpandListener)listeners[i+1]).
                    treeWillCollapse(e);
            }
        }
    }

    
Adds a listener for TreeSelection events.
Params:
tsl – the TreeSelectionListener that will be notified
           when a node is selected or deselected (a "negative
           selection")/**
     * Adds a listener for <code>TreeSelection</code> events.
     *
     * @param tsl the <code>TreeSelectionListener</code> that will be notified
     *            when a node is selected or deselected (a "negative
     *            selection")
     */
    public void addTreeSelectionListener(TreeSelectionListener tsl) {
        listenerList.add(TreeSelectionListener.class,tsl);
        if(listenerList.getListenerCount(TreeSelectionListener.class) != 0
           && selectionRedirector == null) {
            selectionRedirector = new TreeSelectionRedirector();
            selectionModel.addTreeSelectionListener(selectionRedirector);
        }
    }

    
Removes a TreeSelection listener.
Params:
tsl – the TreeSelectionListener to remove/**
     * Removes a <code>TreeSelection</code> listener.
     *
     * @param tsl the <code>TreeSelectionListener</code> to remove
     */
    public void removeTreeSelectionListener(TreeSelectionListener tsl) {
        listenerList.remove(TreeSelectionListener.class,tsl);
        if(listenerList.getListenerCount(TreeSelectionListener.class) == 0
           && selectionRedirector != null) {
            selectionModel.removeTreeSelectionListener
                (selectionRedirector);
            selectionRedirector = null;
        }
    }

    
Returns an array of all the TreeSelectionListeners added
to this JTree with addTreeSelectionListener().
Returns:
all of the TreeSelectionListeners added or an empty
        array if no listeners have been added
Since:
1.4/**
     * Returns an array of all the <code>TreeSelectionListener</code>s added
     * to this JTree with addTreeSelectionListener().
     *
     * @return all of the <code>TreeSelectionListener</code>s added or an empty
     *         array if no listeners have been added
     * @since 1.4
     */
    @BeanProperty(bound = false)
    public TreeSelectionListener[] getTreeSelectionListeners() {
        return listenerList.getListeners(TreeSelectionListener.class);
    }

    
Notifies all listeners that have registered interest for
notification on this event type.
Params:
e – the TreeSelectionEvent to be fired;
         generated by the
         TreeSelectionModel
         when a node is selected or deselected
See Also:
EventListenerList/**
     * Notifies all listeners that have registered interest for
     * notification on this event type.
     *
     * @param e the <code>TreeSelectionEvent</code> to be fired;
     *          generated by the
     *          <code>TreeSelectionModel</code>
     *          when a node is selected or deselected
     * @see EventListenerList
     */
    protected void fireValueChanged(TreeSelectionEvent e) {
        // Guaranteed to return a non-null array
        Object[] listeners = listenerList.getListenerList();
        // Process the listeners last to first, notifying
        // those that are interested in this event
        for (int i = listeners.length-2; i>=0; i-=2) {
            // TreeSelectionEvent e = null;
            if (listeners[i]==TreeSelectionListener.class) {
                // Lazily create the event:
                // if (e == null)
                // e = new ListSelectionEvent(this, firstIndex, lastIndex);
                ((TreeSelectionListener)listeners[i+1]).valueChanged(e);
            }
        }
    }

    
Sent when the tree has changed enough that we need to resize
the bounds, but not enough that we need to remove the
expanded node set (e.g nodes were expanded or collapsed, or
nodes were inserted into the tree). You should never have to
invoke this, the UI will invoke this as it needs to.
/**
     * Sent when the tree has changed enough that we need to resize
     * the bounds, but not enough that we need to remove the
     * expanded node set (e.g nodes were expanded or collapsed, or
     * nodes were inserted into the tree). You should never have to
     * invoke this, the UI will invoke this as it needs to.
     */
    public void treeDidChange() {
        revalidate();
        repaint();
    }

    
Sets the number of rows that are to be displayed.
This will only work if the tree is contained in a
JScrollPane,
and will adjust the preferred size and size of that scrollpane.

This is a bound property.
Params:
newCount – the number of rows to display/**
     * Sets the number of rows that are to be displayed.
     * This will only work if the tree is contained in a
     * <code>JScrollPane</code>,
     * and will adjust the preferred size and size of that scrollpane.
     * <p>
     * This is a bound property.
     *
     * @param newCount the number of rows to display
     */
    @BeanProperty(description
            = "The number of rows that are to be displayed.")
    public void setVisibleRowCount(int newCount) {
        int                 oldCount = visibleRowCount;

        visibleRowCount = newCount;
        firePropertyChange(VISIBLE_ROW_COUNT_PROPERTY, oldCount,
                           visibleRowCount);
        invalidate();
        if (accessibleContext != null) {
            ((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
        }
    }

    
Returns the number of rows that are displayed in the display area.
Returns:
the number of rows displayed/**
     * Returns the number of rows that are displayed in the display area.
     *
     * @return the number of rows displayed
     */
    public int getVisibleRowCount() {
        return visibleRowCount;
    }

    
Expands the root path, assuming the current TreeModel has been set.
/**
     * Expands the root path, assuming the current TreeModel has been set.
     */
    private void expandRoot() {
        TreeModel   model = getModel();
        if(model != null && model.getRoot() != null) {
            expandPath(new TreePath(model.getRoot()));
        }
    }

    
Returns the TreePath to the next tree element that
begins with a prefix. To handle the conversion of a
TreePath into a String, convertValueToText
is used.
Params:
prefix – the string to test for a match
startingRow – the row for starting the search
bias – the search direction, either
Position.Bias.Forward or Position.Bias.Backward.
Throws:
IllegalArgumentException – if prefix is null
or startingRow is out of bounds
Returns:
the TreePath of the next tree element that
starts with the prefix; otherwise null
Since:
1.4/**
     * Returns the TreePath to the next tree element that
     * begins with a prefix. To handle the conversion of a
     * <code>TreePath</code> into a String, <code>convertValueToText</code>
     * is used.
     *
     * @param prefix the string to test for a match
     * @param startingRow the row for starting the search
     * @param bias the search direction, either
     * Position.Bias.Forward or Position.Bias.Backward.
     * @return the TreePath of the next tree element that
     * starts with the prefix; otherwise null
     * @exception IllegalArgumentException if prefix is null
     * or startingRow is out of bounds
     * @since 1.4
     */
    public TreePath getNextMatch(String prefix, int startingRow,
                                 Position.Bias bias) {

        int max = getRowCount();
        if (prefix == null) {
            throw new IllegalArgumentException();
        }
        if (startingRow < 0 || startingRow >= max) {
            throw new IllegalArgumentException();
        }
        prefix = prefix.toUpperCase();

        // start search from the next/previous element froom the
        // selected element
        int increment = (bias == Position.Bias.Forward) ? 1 : -1;
        int row = startingRow;
        do {
            TreePath path = getPathForRow(row);
            String text = convertValueToText(
                path.getLastPathComponent(), isRowSelected(row),
                isExpanded(row), true, row, false);

            if (text.toUpperCase().startsWith(prefix)) {
                return path;
            }
            row = (row + increment + max) % max;
        } while (row != startingRow);
        return null;
    }

    // Serialization support.
    private void writeObject(ObjectOutputStream s) throws IOException {
        Vector<Object> values = new Vector<Object>();

        s.defaultWriteObject();
        // Save the cellRenderer, if its Serializable.
        if(cellRenderer != null && cellRenderer instanceof Serializable) {
            values.addElement("cellRenderer");
            values.addElement(cellRenderer);
        }
        // Save the cellEditor, if its Serializable.
        if(cellEditor != null && cellEditor instanceof Serializable) {
            values.addElement("cellEditor");
            values.addElement(cellEditor);
        }
        // Save the treeModel, if its Serializable.
        if(treeModel != null && treeModel instanceof Serializable) {
            values.addElement("treeModel");
            values.addElement(treeModel);
        }
        // Save the selectionModel, if its Serializable.
        if(selectionModel != null && selectionModel instanceof Serializable) {
            values.addElement("selectionModel");
            values.addElement(selectionModel);
        }

        Object      expandedData = getArchivableExpandedState();

        if(expandedData != null) {
            values.addElement("expandedState");
            values.addElement(expandedData);
        }

        s.writeObject(values);
        if (getUIClassID().equals(uiClassID)) {
            byte count = JComponent.getWriteObjCounter(this);
            JComponent.setWriteObjCounter(this, --count);
            if (count == 0 && ui != null) {
                ui.installUI(this);
            }
        }
    }

    private void readObject(ObjectInputStream s)
        throws IOException, ClassNotFoundException {
        ObjectInputStream.GetField f = s.readFields();

        rootVisible = f.get("rootVisible", false);
        rowHeight = f.get("rowHeight", 0);
        rowHeightSet = f.get("rowHeightSet", false);
        showsRootHandles = f.get("showsRootHandles", false);
        showsRootHandlesSet = f.get("showsRootHandlesSet", false);
        editable = f.get("editable", false);
        largeModel = f.get("largeModel", false);
        visibleRowCount = f.get("visibleRowCount", 0);
        invokesStopCellEditing = f.get("invokesStopCellEditing", false);
        scrollsOnExpand = f.get("scrollsOnExpand", false);
        scrollsOnExpandSet = f.get("scrollsOnExpandSet", false);
        toggleClickCount = f.get("toggleClickCount", 0);
        leadPath = (TreePath) f.get("leadPath", null);
        anchorPath = (TreePath) f.get("anchorPath", null);
        expandsSelectedPaths = f.get("expandsSelectedPaths", false);
        settingUI = f.get("settingUI", false);
        boolean newDragEnabled = f.get("dragEnabled", false);
        checkDragEnabled(newDragEnabled);
        dragEnabled = newDragEnabled;
        DropMode newDropMode = (DropMode) f.get("dropMode",
                DropMode.USE_SELECTION);
        checkDropMode(newDropMode);
        dropMode = newDropMode;

        expandRow = f.get("expandRow", -1);
        dropTimer = (TreeTimer) f.get("dropTimer", null);

        // Create an instance of expanded state.

        expandedState = new Hashtable<TreePath, Boolean>();

        expandedStack = new Stack<Stack<TreePath>>();

        Vector<?>          values = (Vector)s.readObject();
        int             indexCounter = 0;
        int             maxCounter = values.size();

        if(indexCounter < maxCounter && values.elementAt(indexCounter).
           equals("cellRenderer")) {
            cellRenderer = (TreeCellRenderer)values.elementAt(++indexCounter);
            indexCounter++;
        }
        if(indexCounter < maxCounter && values.elementAt(indexCounter).
           equals("cellEditor")) {
            cellEditor = (TreeCellEditor)values.elementAt(++indexCounter);
            indexCounter++;
        }
        if(indexCounter < maxCounter && values.elementAt(indexCounter).
           equals("treeModel")) {
            treeModel = (TreeModel)values.elementAt(++indexCounter);
            indexCounter++;
        }
        if(indexCounter < maxCounter && values.elementAt(indexCounter).
           equals("selectionModel")) {
            selectionModel = (TreeSelectionModel)values.elementAt(++indexCounter);
            indexCounter++;
        }
        if(indexCounter < maxCounter && values.elementAt(indexCounter).
           equals("expandedState")) {
            unarchiveExpandedState(values.elementAt(++indexCounter));
            indexCounter++;
        }
        // Reinstall the redirector.
        if(listenerList.getListenerCount(TreeSelectionListener.class) != 0) {
            selectionRedirector = new TreeSelectionRedirector();
            selectionModel.addTreeSelectionListener(selectionRedirector);
        }
        // Listener to TreeModel.
        if(treeModel != null) {
            treeModelListener = createTreeModelListener();
            if(treeModelListener != null)
                treeModel.addTreeModelListener(treeModelListener);
        }
    }

    
Returns an object that can be archived indicating what nodes are
expanded and what aren't. The objects from the model are NOT
written out.
/**
     * Returns an object that can be archived indicating what nodes are
     * expanded and what aren't. The objects from the model are NOT
     * written out.
     */
    private Object getArchivableExpandedState() {
        TreeModel       model = getModel();

        if(model != null) {
            Enumeration<TreePath> paths = expandedState.keys();

            if(paths != null) {
                Vector<Object> state = new Vector<Object>();

                while(paths.hasMoreElements()) {
                    TreePath path = paths.nextElement();
                    Object     archivePath;

                    try {
                        archivePath = getModelIndexsForPath(path);
                    } catch (Error error) {
                        archivePath = null;
                    }
                    if(archivePath != null) {
                        state.addElement(archivePath);
                        state.addElement(expandedState.get(path));
                    }
                }
                return state;
            }
        }
        return null;
    }

    
Updates the expanded state of nodes in the tree based on the
previously archived state state.
/**
     * Updates the expanded state of nodes in the tree based on the
     * previously archived state <code>state</code>.
     */
    private void unarchiveExpandedState(Object state) {
        if(state instanceof Vector) {
            Vector<?>          paths = (Vector)state;

            for(int counter = paths.size() - 1; counter >= 0; counter--) {
                Boolean        eState = (Boolean)paths.elementAt(counter--);
                TreePath       path;

                try {
                    path = getPathForIndexs((int[])paths.elementAt(counter));
                    if(path != null)
                        expandedState.put(path, eState);
                } catch (Error error) {}
            }
        }
    }

    
Returns an array of integers specifying the indexs of the
components in the path. If path is
the root, this will return an empty array.  If path
is null, null will be returned.
/**
     * Returns an array of integers specifying the indexs of the
     * components in the <code>path</code>. If <code>path</code> is
     * the root, this will return an empty array.  If <code>path</code>
     * is <code>null</code>, <code>null</code> will be returned.
     */
    private int[] getModelIndexsForPath(TreePath path) {
        if(path != null) {
            TreeModel   model = getModel();
            int         count = path.getPathCount();
            int[]       indexs = new int[count - 1];
            Object      parent = model.getRoot();

            for(int counter = 1; counter < count; counter++) {
                indexs[counter - 1] = model.getIndexOfChild
                                   (parent, path.getPathComponent(counter));
                parent = path.getPathComponent(counter);
                if(indexs[counter - 1] < 0)
                    return null;
            }
            return indexs;
        }
        return null;
    }

    
Returns a TreePath created by obtaining the children
for each of the indices in indexs. If indexs
or the TreeModel is null, it will return
null.
/**
     * Returns a <code>TreePath</code> created by obtaining the children
     * for each of the indices in <code>indexs</code>. If <code>indexs</code>
     * or the <code>TreeModel</code> is <code>null</code>, it will return
     * <code>null</code>.
     */
    private TreePath getPathForIndexs(int[] indexs) {
        if(indexs == null)
            return null;

        TreeModel    model = getModel();

        if(model == null)
            return null;

        int          count = indexs.length;

        Object       parent = model.getRoot();
        if (parent == null)
            return null;

        TreePath     parentPath = new TreePath(parent);
        for(int counter = 0; counter < count; counter++) {
            parent = model.getChild(parent, indexs[counter]);
            if(parent == null)
                return null;
            parentPath = parentPath.pathByAddingChild(parent);
        }
        return parentPath;
    }

    
EmptySelectionModel is a TreeSelectionModel
that does not allow anything to be selected.

Warning:
Serialized objects of this class will not be compatible with
future Swing releases. The current serialization support is
appropriate for short term storage or RMI between applications running
the same version of Swing.  As of 1.4, support for long term storage
of all JavaBeans™
has been added to the java.beans package. Please see XMLEncoder. /**
     * <code>EmptySelectionModel</code> is a <code>TreeSelectionModel</code>
     * that does not allow anything to be selected.
     * <p>
     * <strong>Warning:</strong>
     * Serialized objects of this class will not be compatible with
     * future Swing releases. The current serialization support is
     * appropriate for short term storage or RMI between applications running
     * the same version of Swing.  As of 1.4, support for long term storage
     * of all JavaBeans&trade;
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    @SuppressWarnings("serial")
    protected static class EmptySelectionModel extends
              DefaultTreeSelectionModel
    {
        
The single instance of EmptySelectionModel. /**
         * The single instance of {@code EmptySelectionModel}.
         */
        protected static final EmptySelectionModel sharedInstance =
            new EmptySelectionModel();

        
Returns the single instance of EmptySelectionModel. 
Returns:
single instance of EmptySelectionModel/**
         * Returns the single instance of {@code EmptySelectionModel}.
         *
         * @return single instance of {@code EmptySelectionModel}
         */
        public static EmptySelectionModel sharedInstance() {
            return sharedInstance;
        }

        
This is overriden to do nothing; EmptySelectionModel does not allow a selection. 
Params:
paths – the paths to select; this is ignored/**
         * This is overriden to do nothing; {@code EmptySelectionModel}
         * does not allow a selection.
         *
         * @param paths the paths to select; this is ignored
         */
        public void setSelectionPaths(TreePath[] paths) {}

        
This is overriden to do nothing; EmptySelectionModel does not allow a selection. 
Params:
paths – the paths to add to the selection; this is ignored/**
         * This is overriden to do nothing; {@code EmptySelectionModel}
         * does not allow a selection.
         *
         * @param paths the paths to add to the selection; this is ignored
         */
        public void addSelectionPaths(TreePath[] paths) {}

        
This is overriden to do nothing; EmptySelectionModel does not allow a selection. 
Params:
paths – the paths to remove; this is ignored/**
         * This is overriden to do nothing; {@code EmptySelectionModel}
         * does not allow a selection.
         *
         * @param paths the paths to remove; this is ignored
         */
        public void removeSelectionPaths(TreePath[] paths) {}

        
This is overriden to do nothing; EmptySelectionModel does not allow a selection. 
Params:
mode – the selection mode; this is ignored
Since:
1.7/**
         * This is overriden to do nothing; {@code EmptySelectionModel}
         * does not allow a selection.
         *
         * @param mode the selection mode; this is ignored
         * @since 1.7
         */
        public void setSelectionMode(int mode) {
        }

        
This is overriden to do nothing; EmptySelectionModel does not allow a selection. 
Params:
mapper – the RowMapper instance; this is ignored
Since:
1.7/**
         * This is overriden to do nothing; {@code EmptySelectionModel}
         * does not allow a selection.
         *
         * @param mapper the {@code RowMapper} instance; this is ignored
         * @since 1.7
         */
        public void setRowMapper(RowMapper mapper) {
        }

        
This is overriden to do nothing; EmptySelectionModel does not allow a selection. 
Params:
listener – the listener to add; this is ignored
Since:
1.7/**
         * This is overriden to do nothing; {@code EmptySelectionModel}
         * does not allow a selection.
         *
         * @param listener the listener to add; this is ignored
         * @since 1.7
         */
        public void addTreeSelectionListener(TreeSelectionListener listener) {
        }

        
This is overriden to do nothing; EmptySelectionModel does not allow a selection. 
Params:
listener – the listener to remove; this is ignored
Since:
1.7/**
         * This is overriden to do nothing; {@code EmptySelectionModel}
         * does not allow a selection.
         *
         * @param listener the listener to remove; this is ignored
         * @since 1.7
         */
        public void removeTreeSelectionListener(
                TreeSelectionListener listener) {
        }

        
This is overriden to do nothing; EmptySelectionModel does not allow a selection. 
Params:
listener – the listener to add; this is ignored
Since:
1.7/**
         * This is overriden to do nothing; {@code EmptySelectionModel}
         * does not allow a selection.
         *
         * @param listener the listener to add; this is ignored
         * @since 1.7
         */
        public void addPropertyChangeListener(
                                PropertyChangeListener listener) {
        }

        
This is overriden to do nothing; EmptySelectionModel does not allow a selection. 
Params:
listener – the listener to remove; this is ignored
Since:
1.7/**
         * This is overriden to do nothing; {@code EmptySelectionModel}
         * does not allow a selection.
         *
         * @param listener the listener to remove; this is ignored
         * @since 1.7
         */
        public void removePropertyChangeListener(
                                PropertyChangeListener listener) {
        }
    }


    
Handles creating a new TreeSelectionEvent with the
JTree as the
source and passing it off to all the listeners.

Warning:
Serialized objects of this class will not be compatible with
future Swing releases. The current serialization support is
appropriate for short term storage or RMI between applications running
the same version of Swing.  As of 1.4, support for long term storage
of all JavaBeans™
has been added to the java.beans package. Please see XMLEncoder. /**
     * Handles creating a new <code>TreeSelectionEvent</code> with the
     * <code>JTree</code> as the
     * source and passing it off to all the listeners.
     * <p>
     * <strong>Warning:</strong>
     * Serialized objects of this class will not be compatible with
     * future Swing releases. The current serialization support is
     * appropriate for short term storage or RMI between applications running
     * the same version of Swing.  As of 1.4, support for long term storage
     * of all JavaBeans&trade;
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    @SuppressWarnings("serial")
    protected class TreeSelectionRedirector implements Serializable,
                    TreeSelectionListener
    {
        
Invoked by the TreeSelectionModel when the
selection changes.
Params:
e – the TreeSelectionEvent generated by the
             TreeSelectionModel/**
         * Invoked by the <code>TreeSelectionModel</code> when the
         * selection changes.
         *
         * @param e the <code>TreeSelectionEvent</code> generated by the
         *              <code>TreeSelectionModel</code>
         */
        public void valueChanged(TreeSelectionEvent e) {
            TreeSelectionEvent       newE;

            newE = (TreeSelectionEvent)e.cloneWithSource(JTree.this);
            fireValueChanged(newE);
        }
    } // End of class JTree.TreeSelectionRedirector

    //
    // Scrollable interface
    //

    
Returns the preferred display size of a JTree. The height is
determined from getVisibleRowCount and the width
is the current preferred width.
Returns:
a Dimension object containing the preferred size/**
     * Returns the preferred display size of a <code>JTree</code>. The height is
     * determined from <code>getVisibleRowCount</code> and the width
     * is the current preferred width.
     *
     * @return a <code>Dimension</code> object containing the preferred size
     */
    @BeanProperty(bound = false)
    public Dimension getPreferredScrollableViewportSize() {
        int                 width = getPreferredSize().width;
        int                 visRows = getVisibleRowCount();
        int                 height = -1;

        if(isFixedRowHeight())
            height = visRows * getRowHeight();
        else {
            TreeUI          ui = getUI();

            if (ui != null && visRows > 0) {
                int rc = ui.getRowCount(this);

                if (rc >= visRows) {
                    Rectangle bounds = getRowBounds(visRows - 1);
                    if (bounds != null) {
                        height = bounds.y + bounds.height;
                    }
                }
                else if (rc > 0) {
                    Rectangle bounds = getRowBounds(0);
                    if (bounds != null) {
                        height = bounds.height * visRows;
                    }
                }
            }
            if (height == -1) {
                height = 16 * visRows;
            }
        }
        return new Dimension(width, height);
    }

    
Returns the amount to increment when scrolling. The amount is
the height of the first displayed row that isn't completely in view
or, if it is totally displayed, the height of the next row in the
scrolling direction.
Params:
visibleRect – the view area visible within the viewport
orientation – either SwingConstants.VERTICAL
         or SwingConstants.HORIZONTAL
direction – less than zero to scroll up/left,
         greater than zero for down/right
See Also:
JScrollBar.setUnitIncrement(int)
Returns:
the "unit" increment for scrolling in the specified direction/**
     * Returns the amount to increment when scrolling. The amount is
     * the height of the first displayed row that isn't completely in view
     * or, if it is totally displayed, the height of the next row in the
     * scrolling direction.
     *
     * @param visibleRect the view area visible within the viewport
     * @param orientation either <code>SwingConstants.VERTICAL</code>
     *          or <code>SwingConstants.HORIZONTAL</code>
     * @param direction less than zero to scroll up/left,
     *          greater than zero for down/right
     * @return the "unit" increment for scrolling in the specified direction
     * @see JScrollBar#setUnitIncrement(int)
     */
    public int getScrollableUnitIncrement(Rectangle visibleRect,
                                          int orientation, int direction) {
        if(orientation == SwingConstants.VERTICAL) {
            Rectangle       rowBounds;
            int             firstIndex = getClosestRowForLocation
                                         (0, visibleRect.y);

            if(firstIndex != -1) {
                rowBounds = getRowBounds(firstIndex);
                if(rowBounds.y != visibleRect.y) {
                    if(direction < 0) {
                        // UP
                        return Math.max(0, (visibleRect.y - rowBounds.y));
                    }
                    return (rowBounds.y + rowBounds.height - visibleRect.y);
                }
                if(direction < 0) { // UP
                    if(firstIndex != 0) {
                        rowBounds = getRowBounds(firstIndex - 1);
                        return rowBounds.height;
                    }
                }
                else {
                    return rowBounds.height;
                }
            }
            return 0;
        }
        return 4;
    }


    
Returns the amount for a block increment, which is the height or
width of visibleRect, based on orientation.
Params:
visibleRect – the view area visible within the viewport
orientation – either SwingConstants.VERTICAL
         or SwingConstants.HORIZONTAL
direction – less than zero to scroll up/left,
         greater than zero for down/right.
See Also:
JScrollBar.setBlockIncrement(int)
Returns:
the "block" increment for scrolling in the specified direction/**
     * Returns the amount for a block increment, which is the height or
     * width of <code>visibleRect</code>, based on <code>orientation</code>.
     *
     * @param visibleRect the view area visible within the viewport
     * @param orientation either <code>SwingConstants.VERTICAL</code>
     *          or <code>SwingConstants.HORIZONTAL</code>
     * @param direction less than zero to scroll up/left,
     *          greater than zero for down/right.
     * @return the "block" increment for scrolling in the specified direction
     * @see JScrollBar#setBlockIncrement(int)
     */
    public int getScrollableBlockIncrement(Rectangle visibleRect,
                                           int orientation, int direction) {
        return (orientation == SwingConstants.VERTICAL) ? visibleRect.height :
            visibleRect.width;
    }

    
Returns false to indicate that the width of the viewport does not
determine the width of the table, unless the preferred width of
the tree is smaller than the viewports width.  In other words:
ensure that the tree is never smaller than its viewport.
See Also:
Scrollable.getScrollableTracksViewportWidth
Returns:
whether the tree should track the width of the viewport/**
     * Returns false to indicate that the width of the viewport does not
     * determine the width of the table, unless the preferred width of
     * the tree is smaller than the viewports width.  In other words:
     * ensure that the tree is never smaller than its viewport.
     *
     * @return whether the tree should track the width of the viewport
     * @see Scrollable#getScrollableTracksViewportWidth
     */
    @BeanProperty(bound = false)
    public boolean getScrollableTracksViewportWidth() {
        Container parent = SwingUtilities.getUnwrappedParent(this);
        if (parent instanceof JViewport) {
            return parent.getWidth() > getPreferredSize().width;
        }
        return false;
    }

    
Returns false to indicate that the height of the viewport does not
determine the height of the table, unless the preferred height
of the tree is smaller than the viewports height.  In other words:
ensure that the tree is never smaller than its viewport.
See Also:
Scrollable.getScrollableTracksViewportHeight
Returns:
whether the tree should track the height of the viewport/**
     * Returns false to indicate that the height of the viewport does not
     * determine the height of the table, unless the preferred height
     * of the tree is smaller than the viewports height.  In other words:
     * ensure that the tree is never smaller than its viewport.
     *
     * @return whether the tree should track the height of the viewport
     * @see Scrollable#getScrollableTracksViewportHeight
     */
    @BeanProperty(bound = false)
    public boolean getScrollableTracksViewportHeight() {
        Container parent = SwingUtilities.getUnwrappedParent(this);
        if (parent instanceof JViewport) {
            return parent.getHeight() > getPreferredSize().height;
        }
        return false;
    }

    
Sets the expanded state of this JTree.
If state is
true, all parents of path and path are marked as
expanded. If state is false, all parents of
path are marked EXPANDED, but path itself
is marked collapsed.

This will fail if a TreeWillExpandListener vetos it.
Params:
path – a TreePath identifying a node
state – if true, all parents of @{code path} and path are marked as expanded. Otherwise, all parents of path are marked EXPANDED, but path itself is marked collapsed./**
     * Sets the expanded state of this <code>JTree</code>.
     * If <code>state</code> is
     * true, all parents of <code>path</code> and path are marked as
     * expanded. If <code>state</code> is false, all parents of
     * <code>path</code> are marked EXPANDED, but <code>path</code> itself
     * is marked collapsed.<p>
     * This will fail if a <code>TreeWillExpandListener</code> vetos it.
     *
     * @param path a {@code TreePath} identifying a node
     * @param state if {@code true}, all parents of @{code path} and path are marked as expanded.
     *              Otherwise, all parents of {@code path} are marked EXPANDED,
     *              but {@code path} itself is marked collapsed.
     */
    protected void setExpandedState(TreePath path, boolean state) {
        if(path != null) {
            // Make sure all parents of path are expanded.
            Stack<TreePath> stack;
            TreePath parentPath = path.getParentPath();

            if (expandedStack.size() == 0) {
                stack = new Stack<TreePath>();
            }
            else {
                stack = expandedStack.pop();
            }

            try {
                while(parentPath != null) {
                    if(isExpanded(parentPath)) {
                        parentPath = null;
                    }
                    else {
                        stack.push(parentPath);
                        parentPath = parentPath.getParentPath();
                    }
                }
                for(int counter = stack.size() - 1; counter >= 0; counter--) {
                    parentPath = stack.pop();
                    if(!isExpanded(parentPath)) {
                        try {
                            fireTreeWillExpand(parentPath);
                        } catch (ExpandVetoException eve) {
                            // Expand vetoed!
                            return;
                        }
                        expandedState.put(parentPath, Boolean.TRUE);
                        fireTreeExpanded(parentPath);
                        if (accessibleContext != null) {
                            ((AccessibleJTree)accessibleContext).
                                              fireVisibleDataPropertyChange();
                        }
                    }
                }
            }
            finally {
                if (expandedStack.size() < TEMP_STACK_SIZE) {
                    stack.removeAllElements();
                    expandedStack.push(stack);
                }
            }
            if(!state) {
                // collapse last path.
                Object          cValue = expandedState.get(path);

                if(cValue != null && ((Boolean)cValue).booleanValue()) {
                    try {
                        fireTreeWillCollapse(path);
                    }
                    catch (ExpandVetoException eve) {
                        return;
                    }
                    expandedState.put(path, Boolean.FALSE);
                    fireTreeCollapsed(path);
                    if (removeDescendantSelectedPaths(path, false) &&
                        !isPathSelected(path)) {
                        // A descendant was selected, select the parent.
                        addSelectionPath(path);
                    }
                    if (accessibleContext != null) {
                        ((AccessibleJTree)accessibleContext).
                                    fireVisibleDataPropertyChange();
                    }
                }
            }
            else {
                // Expand last path.
                Object          cValue = expandedState.get(path);

                if(cValue == null || !((Boolean)cValue).booleanValue()) {
                    try {
                        fireTreeWillExpand(path);
                    }
                    catch (ExpandVetoException eve) {
                        return;
                    }
                    expandedState.put(path, Boolean.TRUE);
                    fireTreeExpanded(path);
                    if (accessibleContext != null) {
                        ((AccessibleJTree)accessibleContext).
                                          fireVisibleDataPropertyChange();
                    }
                }
            }
        }
    }

    
Returns an Enumeration of TreePaths that have been expanded that are descendants of parent. 
Params:
parent – a path
Returns:
the Enumeration of TreePaths/**
     * Returns an {@code Enumeration} of {@code TreePaths}
     * that have been expanded that
     * are descendants of {@code parent}.
     *
     * @param parent a path
     * @return the {@code Enumeration} of {@code TreePaths}
     */
    protected Enumeration<TreePath>
        getDescendantToggledPaths(TreePath parent)
    {
        if(parent == null)
            return null;

        Vector<TreePath> descendants = new Vector<TreePath>();
        Enumeration<TreePath> nodes = expandedState.keys();

        while(nodes.hasMoreElements()) {
            TreePath path = nodes.nextElement();
            if(parent.isDescendant(path))
                descendants.addElement(path);
        }
        return descendants.elements();
    }

    
Removes any descendants of the TreePaths in
toRemove
that have been expanded.
Params:
toRemove – an enumeration of the paths to remove; a value of null is ignored
Throws:
ClassCastException – if toRemove contains an element that is not a TreePath; null values are ignored/**
     * Removes any descendants of the <code>TreePaths</code> in
     * <code>toRemove</code>
     * that have been expanded.
     *
     * @param toRemove an enumeration of the paths to remove; a value of
     *        {@code null} is ignored
     * @throws ClassCastException if {@code toRemove} contains an
     *         element that is not a {@code TreePath}; {@code null}
     *         values are ignored
     */
     protected void
         removeDescendantToggledPaths(Enumeration<TreePath> toRemove)
    {
         if(toRemove != null) {
             while(toRemove.hasMoreElements()) {
                 Enumeration<?> descendants = getDescendantToggledPaths
                         (toRemove.nextElement());

                 if(descendants != null) {
                     while(descendants.hasMoreElements()) {
                         expandedState.remove(descendants.nextElement());
                     }
                 }
             }
         }
     }

     
Clears the cache of toggled tree paths. This does NOT send out
any TreeExpansionListener events.
/**
      * Clears the cache of toggled tree paths. This does NOT send out
      * any <code>TreeExpansionListener</code> events.
      */
     protected void clearToggledPaths() {
         expandedState.clear();
     }

     
Creates and returns an instance of TreeModelHandler.
The returned
object is responsible for updating the expanded state when the
TreeModel changes.

For more information on what expanded state means, see the
JTree description above.
Returns:
the instance of TreeModelHandler/**
      * Creates and returns an instance of <code>TreeModelHandler</code>.
      * The returned
      * object is responsible for updating the expanded state when the
      * <code>TreeModel</code> changes.
      * <p>
      * For more information on what expanded state means, see the
      * <a href=#jtree_description>JTree description</a> above.
      *
      * @return the instance of {@code TreeModelHandler}
      */
     protected TreeModelListener createTreeModelListener() {
         return new TreeModelHandler();
     }

    
Removes any paths in the selection that are descendants of
path. If includePath is true and
path is selected, it will be removed from the selection.
Params:
path – a path
includePath – is true and path is selected, it will be removed from the selection.
Returns:
true if a descendant was selected
Since:
1.3/**
     * Removes any paths in the selection that are descendants of
     * <code>path</code>. If <code>includePath</code> is true and
     * <code>path</code> is selected, it will be removed from the selection.
     *
     * @param path a path
     * @param includePath is {@code true} and {@code path} is selected,
     *                    it will be removed from the selection.
     * @return true if a descendant was selected
     * @since 1.3
     */
    protected boolean removeDescendantSelectedPaths(TreePath path,
                                                    boolean includePath) {
        TreePath[]    toRemove = getDescendantSelectedPaths(path, includePath);

        if (toRemove != null) {
            getSelectionModel().removeSelectionPaths(toRemove);
            return true;
        }
        return false;
    }

    
Returns an array of paths in the selection that are descendants of
path. The returned array may contain nulls.
/**
     * Returns an array of paths in the selection that are descendants of
     * <code>path</code>. The returned array may contain <code>null</code>s.
     */
    private TreePath[] getDescendantSelectedPaths(TreePath path,
                                                  boolean includePath) {
        TreeSelectionModel   sm = getSelectionModel();
        TreePath[]           selPaths = (sm != null) ? sm.getSelectionPaths() :
                                        null;

        if(selPaths != null) {
            boolean        shouldRemove = false;

            for(int counter = selPaths.length - 1; counter >= 0; counter--) {
                if(selPaths[counter] != null &&
                   path.isDescendant(selPaths[counter]) &&
                   (!path.equals(selPaths[counter]) || includePath))
                    shouldRemove = true;
                else
                    selPaths[counter] = null;
            }
            if(!shouldRemove) {
                selPaths = null;
            }
            return selPaths;
        }
        return null;
    }

    
Removes any paths from the selection model that are descendants of
the nodes identified by in e.
/**
     * Removes any paths from the selection model that are descendants of
     * the nodes identified by in <code>e</code>.
     */
    void removeDescendantSelectedPaths(TreeModelEvent e) {
        TreePath            pPath = SwingUtilities2.getTreePath(e, getModel());
        Object[]            oldChildren = e.getChildren();
        TreeSelectionModel  sm = getSelectionModel();

        if (sm != null && pPath != null && oldChildren != null &&
            oldChildren.length > 0) {
            for (int counter = oldChildren.length - 1; counter >= 0;
                 counter--) {
                // Might be better to call getDescendantSelectedPaths
                // numerous times, then push to the model.
                removeDescendantSelectedPaths(pPath.pathByAddingChild
                                              (oldChildren[counter]), true);
            }
        }
    }


     
Listens to the model and updates the expandedState
accordingly when nodes are removed, or changed.
/**
      * Listens to the model and updates the <code>expandedState</code>
      * accordingly when nodes are removed, or changed.
      */
    protected class TreeModelHandler implements TreeModelListener {
        public void treeNodesChanged(TreeModelEvent e) { }

        public void treeNodesInserted(TreeModelEvent e) { }

        public void treeStructureChanged(TreeModelEvent e) {
            if(e == null)
                return;

            // NOTE: If I change this to NOT remove the descendants
            // and update BasicTreeUIs treeStructureChanged method
            // to update descendants in response to a treeStructureChanged
            // event, all the children of the event won't collapse!
            TreePath            parent = SwingUtilities2.getTreePath(e, getModel());

            if(parent == null)
                return;

            if (parent.getPathCount() == 1) {
                // New root, remove everything!
                clearToggledPaths();

              Object treeRoot = treeModel.getRoot();

              if(treeRoot != null &&
                !treeModel.isLeaf(treeRoot)) {
                    // Mark the root as expanded, if it isn't a leaf.
                    expandedState.put(parent, Boolean.TRUE);
                }
            }
            else if(expandedState.get(parent) != null) {
                Vector<TreePath>    toRemove = new Vector<TreePath>(1);
                boolean             isExpanded = isExpanded(parent);

                toRemove.addElement(parent);
                removeDescendantToggledPaths(toRemove.elements());
                if(isExpanded) {
                    TreeModel         model = getModel();

                    if(model == null || model.isLeaf
                       (parent.getLastPathComponent()))
                        collapsePath(parent);
                    else
                        expandedState.put(parent, Boolean.TRUE);
                }
            }
            removeDescendantSelectedPaths(parent, false);
        }

        public void treeNodesRemoved(TreeModelEvent e) {
            if(e == null)
                return;

            TreePath            parent = SwingUtilities2.getTreePath(e, getModel());
            Object[]            children = e.getChildren();

            if(children == null)
                return;

            TreePath            rPath;
            Vector<TreePath>    toRemove
                = new Vector<TreePath>(Math.max(1, children.length));

            for(int counter = children.length - 1; counter >= 0; counter--) {
                rPath = parent.pathByAddingChild(children[counter]);
                if(expandedState.get(rPath) != null)
                    toRemove.addElement(rPath);
            }
            if(toRemove.size() > 0)
                removeDescendantToggledPaths(toRemove.elements());

            TreeModel         model = getModel();

            if(model == null || model.isLeaf(parent.getLastPathComponent()))
                expandedState.remove(parent);

            removeDescendantSelectedPaths(e);
        }
    }


    
DynamicUtilTreeNode can wrap
vectors/hashtables/arrays/strings and
create the appropriate children tree nodes as necessary. It is
dynamic in that it will only create the children as necessary.

Warning:
Serialized objects of this class will not be compatible with
future Swing releases. The current serialization support is
appropriate for short term storage or RMI between applications running
the same version of Swing.  As of 1.4, support for long term storage
of all JavaBeans™
has been added to the java.beans package. Please see XMLEncoder. /**
     * <code>DynamicUtilTreeNode</code> can wrap
     * vectors/hashtables/arrays/strings and
     * create the appropriate children tree nodes as necessary. It is
     * dynamic in that it will only create the children as necessary.
     * <p>
     * <strong>Warning:</strong>
     * Serialized objects of this class will not be compatible with
     * future Swing releases. The current serialization support is
     * appropriate for short term storage or RMI between applications running
     * the same version of Swing.  As of 1.4, support for long term storage
     * of all JavaBeans&trade;
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    @SuppressWarnings("serial")
    public static class DynamicUtilTreeNode extends DefaultMutableTreeNode {
        
Does the this JTree have children?
This property is currently not implemented.
/**
         * Does the this <code>JTree</code> have children?
         * This property is currently not implemented.
         */
        protected boolean            hasChildren;
        
Value to create children with. /** Value to create children with. */
        protected Object             childValue;
        
Have the children been loaded yet? /** Have the children been loaded yet? */
        protected boolean            loadedChildren;

        
Adds to parent all the children in children.
If children is an array or vector all of its
elements are added is children, otherwise if children
is a hashtable all the key/value pairs are added in the order
Enumeration returns them.
Params:
parent – the parent node
children – the children/**
         * Adds to parent all the children in <code>children</code>.
         * If <code>children</code> is an array or vector all of its
         * elements are added is children, otherwise if <code>children</code>
         * is a hashtable all the key/value pairs are added in the order
         * <code>Enumeration</code> returns them.
         *
         * @param parent the parent node
         * @param children the children
         */
        public static void createChildren(DefaultMutableTreeNode parent,
                                          Object children) {
            if(children instanceof Vector) {
                Vector<?>          childVector = (Vector)children;

                for(int counter = 0, maxCounter = childVector.size();
                    counter < maxCounter; counter++)
                    parent.add(new DynamicUtilTreeNode
                               (childVector.elementAt(counter),
                                childVector.elementAt(counter)));
            }
            else if(children instanceof Hashtable) {
                Hashtable<?,?>           childHT = (Hashtable)children;
                Enumeration<?>         keys = childHT.keys();
                Object              aKey;

                while(keys.hasMoreElements()) {
                    aKey = keys.nextElement();
                    parent.add(new DynamicUtilTreeNode(aKey,
                                                       childHT.get(aKey)));
                }
            }
            else if(children instanceof Object[]) {
                Object[]             childArray = (Object[])children;

                for(int counter = 0, maxCounter = childArray.length;
                    counter < maxCounter; counter++)
                    parent.add(new DynamicUtilTreeNode(childArray[counter],
                                                       childArray[counter]));
            }
        }

        
Creates a node with the specified object as its value and
with the specified children. For the node to allow children,
the children-object must be an array of objects, a
Vector, or a Hashtable -- even
if empty. Otherwise, the node is not
allowed to have children.
Params:
value –  the Object that is the value for the
             new node
children – an array of Objects, a
             Vector, or a Hashtable
             used to create the child nodes; if any other
             object is specified, or if the value is
             null,
             then the node is not allowed to have children/**
         * Creates a node with the specified object as its value and
         * with the specified children. For the node to allow children,
         * the children-object must be an array of objects, a
         * <code>Vector</code>, or a <code>Hashtable</code> -- even
         * if empty. Otherwise, the node is not
         * allowed to have children.
         *
         * @param value  the <code>Object</code> that is the value for the
         *              new node
         * @param children an array of <code>Object</code>s, a
         *              <code>Vector</code>, or a <code>Hashtable</code>
         *              used to create the child nodes; if any other
         *              object is specified, or if the value is
         *              <code>null</code>,
         *              then the node is not allowed to have children
         */
        public DynamicUtilTreeNode(Object value, Object children) {
            super(value);
            loadedChildren = false;
            childValue = children;
            if(children != null) {
                if(children instanceof Vector)
                    setAllowsChildren(true);
                else if(children instanceof Hashtable)
                    setAllowsChildren(true);
                else if(children instanceof Object[])
                    setAllowsChildren(true);
                else
                    setAllowsChildren(false);
            }
            else
                setAllowsChildren(false);
        }

        
Returns true if this node allows children. Whether the node
allows children depends on how it was created.
See Also:
DynamicUtilTreeNode
Returns:
true if this node allows children, false otherwise/**
         * Returns true if this node allows children. Whether the node
         * allows children depends on how it was created.
         *
         * @return true if this node allows children, false otherwise
         * @see JTree.DynamicUtilTreeNode
         */
        public boolean isLeaf() {
            return !getAllowsChildren();
        }

        
Returns the number of child nodes.
Returns:
the number of child nodes/**
         * Returns the number of child nodes.
         *
         * @return the number of child nodes
         */
        public int getChildCount() {
            if(!loadedChildren)
                loadChildren();
            return super.getChildCount();
        }

        
Loads the children based on childValue.
If childValue is a Vector
or array each element is added as a child,
if childValue is a Hashtable
each key/value pair is added in the order that
Enumeration returns the keys.
/**
         * Loads the children based on <code>childValue</code>.
         * If <code>childValue</code> is a <code>Vector</code>
         * or array each element is added as a child,
         * if <code>childValue</code> is a <code>Hashtable</code>
         * each key/value pair is added in the order that
         * <code>Enumeration</code> returns the keys.
         */
        protected void loadChildren() {
            loadedChildren = true;
            createChildren(this, childValue);
        }

        
Subclassed to load the children, if necessary.
/**
         * Subclassed to load the children, if necessary.
         */
        public TreeNode getChildAt(int index) {
            if(!loadedChildren)
                loadChildren();
            return super.getChildAt(index);
        }

        
Subclassed to load the children, if necessary.
/**
         * Subclassed to load the children, if necessary.
         */
        public Enumeration<TreeNode> children() {
            if(!loadedChildren)
                loadChildren();
            return super.children();
        }
    }

    void setUIProperty(String propertyName, Object value) {
        if (propertyName == "rowHeight") {
            if (!rowHeightSet) {
                setRowHeight(((Number)value).intValue());
                rowHeightSet = false;
            }
        } else if (propertyName == "scrollsOnExpand") {
            if (!scrollsOnExpandSet) {
                setScrollsOnExpand(((Boolean)value).booleanValue());
                scrollsOnExpandSet = false;
            }
        } else if (propertyName == "showsRootHandles") {
            if (!showsRootHandlesSet) {
                setShowsRootHandles(((Boolean)value).booleanValue());
                showsRootHandlesSet = false;
            }
        } else {
            super.setUIProperty(propertyName, value);
        }
    }


    
Returns a string representation of this JTree.
This method
is intended to be used only for debugging purposes, and the
content and format of the returned string may vary between
implementations. The returned string may be empty but may not
be null.
Returns:
 a string representation of this JTree./**
     * Returns a string representation of this <code>JTree</code>.
     * This method
     * is intended to be used only for debugging purposes, and the
     * content and format of the returned string may vary between
     * implementations. The returned string may be empty but may not
     * be <code>null</code>.
     *
     * @return  a string representation of this <code>JTree</code>.
     */
    protected String paramString() {
        String rootVisibleString = (rootVisible ?
                                    "true" : "false");
        String showsRootHandlesString = (showsRootHandles ?
                                         "true" : "false");
        String editableString = (editable ?
                                 "true" : "false");
        String largeModelString = (largeModel ?
                                   "true" : "false");
        String invokesStopCellEditingString = (invokesStopCellEditing ?
                                               "true" : "false");
        String scrollsOnExpandString = (scrollsOnExpand ?
                                        "true" : "false");

        return super.paramString() +
        ",editable=" + editableString +
        ",invokesStopCellEditing=" + invokesStopCellEditingString +
        ",largeModel=" + largeModelString +
        ",rootVisible=" + rootVisibleString +
        ",rowHeight=" + rowHeight +
        ",scrollsOnExpand=" + scrollsOnExpandString +
        ",showsRootHandles=" + showsRootHandlesString +
        ",toggleClickCount=" + toggleClickCount +
        ",visibleRowCount=" + visibleRowCount;
    }

/////////////////
// Accessibility support
////////////////

    
Gets the AccessibleContext associated with this JTree.
For JTrees, the AccessibleContext takes the form of an
AccessibleJTree.
A new AccessibleJTree instance is created if necessary.
Returns:
an AccessibleJTree that serves as the
        AccessibleContext of this JTree/**
     * Gets the AccessibleContext associated with this JTree.
     * For JTrees, the AccessibleContext takes the form of an
     * AccessibleJTree.
     * A new AccessibleJTree instance is created if necessary.
     *
     * @return an AccessibleJTree that serves as the
     *         AccessibleContext of this JTree
     */
    @BeanProperty(bound = false)
    public AccessibleContext getAccessibleContext() {
        if (accessibleContext == null) {
            accessibleContext = new AccessibleJTree();
        }
        return accessibleContext;
    }

    
This class implements accessibility support for the
JTree class.  It provides an implementation of the
Java Accessibility API appropriate to tree user-interface elements.

Warning:
Serialized objects of this class will not be compatible with
future Swing releases. The current serialization support is
appropriate for short term storage or RMI between applications running
the same version of Swing.  As of 1.4, support for long term storage
of all JavaBeans™
has been added to the java.beans package. Please see XMLEncoder. /**
     * This class implements accessibility support for the
     * <code>JTree</code> class.  It provides an implementation of the
     * Java Accessibility API appropriate to tree user-interface elements.
     * <p>
     * <strong>Warning:</strong>
     * Serialized objects of this class will not be compatible with
     * future Swing releases. The current serialization support is
     * appropriate for short term storage or RMI between applications running
     * the same version of Swing.  As of 1.4, support for long term storage
     * of all JavaBeans&trade;
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    @SuppressWarnings("serial")
    protected class AccessibleJTree extends AccessibleJComponent
            implements AccessibleSelection, TreeSelectionListener,
                       TreeModelListener, TreeExpansionListener  {

        TreePath   leadSelectionPath;
        Accessible leadSelectionAccessible;

        
Constructs AccessibleJTree /**
         * Constructs {@code AccessibleJTree}
         */
        public AccessibleJTree() {
            // Add a tree model listener for JTree
            TreeModel model = JTree.this.getModel();
            if (model != null) {
                model.addTreeModelListener(this);
            }
            JTree.this.addTreeExpansionListener(this);
            JTree.this.addTreeSelectionListener(this);
            leadSelectionPath = JTree.this.getLeadSelectionPath();
            leadSelectionAccessible = (leadSelectionPath != null)
                    ? new AccessibleJTreeNode(JTree.this,
                                              leadSelectionPath,
                                              JTree.this)
                    : null;
        }

        
Tree Selection Listener value change method. Used to fire the
property change
Params:
e – ListSelectionEvent/**
         * Tree Selection Listener value change method. Used to fire the
         * property change
         *
         * @param e ListSelectionEvent
         *
         */
        public void valueChanged(TreeSelectionEvent e) {
             firePropertyChange(AccessibleContext.ACCESSIBLE_SELECTION_PROPERTY,
                                Boolean.valueOf(false), Boolean.valueOf(true));
         }

        
Fire a visible data property change notification.
A 'visible' data property is one that represents
something about the way the component appears on the
display, where that appearance isn't bound to any other
property. It notifies screen readers  that the visual
appearance of the component has changed, so they can
notify the user.
/**
         * Fire a visible data property change notification.
         * A 'visible' data property is one that represents
         * something about the way the component appears on the
         * display, where that appearance isn't bound to any other
         * property. It notifies screen readers  that the visual
         * appearance of the component has changed, so they can
         * notify the user.
         */
        public void fireVisibleDataPropertyChange() {
           firePropertyChange(AccessibleContext.ACCESSIBLE_VISIBLE_DATA_PROPERTY,
                              Boolean.valueOf(false), Boolean.valueOf(true));
        }

        // Fire the visible data changes for the model changes.

        
Tree Model Node change notification.
Params:
e –  a Tree Model event/**
         * Tree Model Node change notification.
         *
         * @param e  a Tree Model event
         */
        public void treeNodesChanged(TreeModelEvent e) {
           fireVisibleDataPropertyChange();
        }

        
Tree Model Node change notification.
Params:
e –  a Tree node insertion event/**
         * Tree Model Node change notification.
         *
         * @param e  a Tree node insertion event
         */
        public void treeNodesInserted(TreeModelEvent e) {
           fireVisibleDataPropertyChange();
        }

        
Tree Model Node change notification.
Params:
e –  a Tree node(s) removal event/**
         * Tree Model Node change notification.
         *
         * @param e  a Tree node(s) removal event
         */
        public  void treeNodesRemoved(TreeModelEvent e) {
           fireVisibleDataPropertyChange();
        }

        
Tree Model structure change change notification.
Params:
e –  a Tree Model event/**
         * Tree Model structure change change notification.
         *
         * @param e  a Tree Model event
         */
        public  void treeStructureChanged(TreeModelEvent e) {
           fireVisibleDataPropertyChange();
        }

        
Tree Collapsed notification.
Params:
e –  a TreeExpansionEvent/**
         * Tree Collapsed notification.
         *
         * @param e  a TreeExpansionEvent
         */
        public  void treeCollapsed(TreeExpansionEvent e) {
            fireVisibleDataPropertyChange();
            TreePath path = e.getPath();
            if (path != null) {
                // Set parent to null so AccessibleJTreeNode computes
                // its parent.
                AccessibleJTreeNode node = new AccessibleJTreeNode(JTree.this,
                                                                   path,
                                                                   null);
                PropertyChangeEvent pce = new PropertyChangeEvent(node,
                    AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
                    AccessibleState.EXPANDED,
                    AccessibleState.COLLAPSED);
                firePropertyChange(AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
                                   null, pce);
            }
        }

        
Tree Model Expansion notification.
Params:
e –  a Tree node insertion event/**
         * Tree Model Expansion notification.
         *
         * @param e  a Tree node insertion event
         */
        public  void treeExpanded(TreeExpansionEvent e) {
            fireVisibleDataPropertyChange();
            TreePath path = e.getPath();
            if (path != null) {
                // TIGER - 4839971
                // Set parent to null so AccessibleJTreeNode computes
                // its parent.
                AccessibleJTreeNode node = new AccessibleJTreeNode(JTree.this,
                                                                   path,
                                                                   null);
                PropertyChangeEvent pce = new PropertyChangeEvent(node,
                    AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
                    AccessibleState.COLLAPSED,
                    AccessibleState.EXPANDED);
                firePropertyChange(AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
                                   null, pce);
            }
        }

        
 Fire an active descendant property change notification.
 The active descendant is used for objects such as list,
 tree, and table, which may have transient children.
 It notifies screen readers the active child of the component
 has been changed so user can be notified from there.
Params:
oldPath – - lead path of previous active child
newPath – - lead path of current active child/**
        *  Fire an active descendant property change notification.
        *  The active descendant is used for objects such as list,
        *  tree, and table, which may have transient children.
        *  It notifies screen readers the active child of the component
        *  has been changed so user can be notified from there.
        *
        * @param oldPath - lead path of previous active child
        * @param newPath - lead path of current active child
        *
        */
        void fireActiveDescendantPropertyChange(TreePath oldPath, TreePath newPath){
            if(oldPath != newPath){
                Accessible oldLSA = (oldPath != null)
                                    ? new AccessibleJTreeNode(JTree.this,
                                                              oldPath,
                                                              null)
                                    : null;

                Accessible newLSA = (newPath != null)
                                    ? new AccessibleJTreeNode(JTree.this,
                                                              newPath,
                                                              null)
                                    : null;
                firePropertyChange(AccessibleContext.ACCESSIBLE_ACTIVE_DESCENDANT_PROPERTY,
                                                                oldLSA, newLSA);
            }
        }

        private AccessibleContext getCurrentAccessibleContext() {
            Component c = getCurrentComponent();
            if (c instanceof Accessible) {
                return c.getAccessibleContext();
            } else {
                return null;
            }
        }

        private Component getCurrentComponent() {
            // is the object visible?
            // if so, get row, selected, focus & leaf state,
            // and then get the renderer component and return it
            TreeModel model = JTree.this.getModel();
            if (model == null) {
                return null;
            }

            Object treeRoot = model.getRoot();
            if (treeRoot == null) {
                return null;
            }
            TreePath path = new TreePath(treeRoot);
            if (JTree.this.isVisible(path)) {
                TreeCellRenderer r = JTree.this.getCellRenderer();
                TreeUI ui = JTree.this.getUI();
                if (ui != null) {
                    int row = ui.getRowForPath(JTree.this, path);
                    int lsr = JTree.this.getLeadSelectionRow();
                    boolean hasFocus = JTree.this.isFocusOwner()
                                       && (lsr == row);
                    boolean selected = JTree.this.isPathSelected(path);
                    boolean expanded = JTree.this.isExpanded(path);

                    return r.getTreeCellRendererComponent(JTree.this,
                        treeRoot, selected, expanded,
                        model.isLeaf(treeRoot), row, hasFocus);
                }
            }
            return null;
        }

        // Overridden methods from AccessibleJComponent

        
Get the role of this object.
See Also:
AccessibleRole
Returns:
an instance of AccessibleRole describing the role of the
object/**
         * Get the role of this object.
         *
         * @return an instance of AccessibleRole describing the role of the
         * object
         * @see AccessibleRole
         */
        public AccessibleRole getAccessibleRole() {
            return AccessibleRole.TREE;
        }

        
Returns the Accessible child, if one exists,
contained at the local coordinate Point.
Otherwise returns null.
Params:
p – point in local coordinates of this Accessible
Returns:
the Accessible, if it exists,
   at the specified location; else null/**
         * Returns the <code>Accessible</code> child, if one exists,
         * contained at the local coordinate <code>Point</code>.
         * Otherwise returns <code>null</code>.
         *
         * @param p point in local coordinates of this <code>Accessible</code>
         * @return the <code>Accessible</code>, if it exists,
         *    at the specified location; else <code>null</code>
         */
        public Accessible getAccessibleAt(Point p) {
            TreePath path = getClosestPathForLocation(p.x, p.y);
            if (path != null) {
                // JTree.this is NOT the parent; parent will get computed later
                return new AccessibleJTreeNode(JTree.this, path, null);
            } else {
                return null;
            }
        }

        
Returns the number of top-level children nodes of this
JTree.  Each of these nodes may in turn have children nodes.
Returns:
the number of accessible children nodes in the tree./**
         * Returns the number of top-level children nodes of this
         * JTree.  Each of these nodes may in turn have children nodes.
         *
         * @return the number of accessible children nodes in the tree.
         */
        public int getAccessibleChildrenCount() {
            TreeModel model = JTree.this.getModel();
            if (model == null) {
                return 0;
            }
            if (isRootVisible()) {
                return 1;    // the root node
            }

            Object treeRoot = model.getRoot();
            if (treeRoot == null)
                return 0;

            // return the root's first set of children count
            return model.getChildCount(treeRoot);
        }

        
Return the nth Accessible child of the object.
Params:
i – zero-based index of child
Returns:
the nth Accessible child of the object/**
         * Return the nth Accessible child of the object.
         *
         * @param i zero-based index of child
         * @return the nth Accessible child of the object
         */
        public Accessible getAccessibleChild(int i) {
            TreeModel model = JTree.this.getModel();
            if (model == null) {
                return null;
            }

            Object treeRoot = model.getRoot();
            if (treeRoot == null) {
                return null;
            }

            if (isRootVisible()) {
                if (i == 0) {    // return the root node Accessible
                    Object[] objPath = { treeRoot };
                    TreePath path = new TreePath(objPath);
                    return new AccessibleJTreeNode(JTree.this, path, JTree.this);
                } else {
                    return null;
                }
            }

            // return Accessible for one of root's child nodes
            int count = model.getChildCount(treeRoot);
            if (i < 0 || i >= count) {
                return null;
            }
            Object obj = model.getChild(treeRoot, i);
            if (obj == null)
                return null;

            Object[] objPath = {treeRoot, obj };

            TreePath path = new TreePath(objPath);
            return new AccessibleJTreeNode(JTree.this, path, JTree.this);
        }

        
Get the index of this object in its accessible parent.
See Also:
AccessibleAWTComponent.getAccessibleParent
Returns:
the index of this object in its parent.  Since a JTree
top-level object does not have an accessible parent./**
         * Get the index of this object in its accessible parent.
         *
         * @return the index of this object in its parent.  Since a JTree
         * top-level object does not have an accessible parent.
         * @see #getAccessibleParent
         */
        public int getAccessibleIndexInParent() {
            // didn't ever need to override this...
            return super.getAccessibleIndexInParent();
        }

        // AccessibleSelection methods
        
Get the AccessibleSelection associated with this object.  In the
implementation of the Java Accessibility API for this class,
return this object, which is responsible for implementing the
AccessibleSelection interface on behalf of itself.
Returns:
this object/**
         * Get the AccessibleSelection associated with this object.  In the
         * implementation of the Java Accessibility API for this class,
         * return this object, which is responsible for implementing the
         * AccessibleSelection interface on behalf of itself.
         *
         * @return this object
         */
        public AccessibleSelection getAccessibleSelection() {
            return this;
        }

        
Returns the number of items currently selected.
If no items are selected, the return value will be 0.
Returns:
the number of items currently selected./**
         * Returns the number of items currently selected.
         * If no items are selected, the return value will be 0.
         *
         * @return the number of items currently selected.
         */
        public int getAccessibleSelectionCount() {
            Object[] rootPath = new Object[1];
            rootPath[0] = treeModel.getRoot();
            if (rootPath[0] == null)
                return 0;

            TreePath childPath = new TreePath(rootPath);
            if (JTree.this.isPathSelected(childPath)) {
                return 1;
            } else {
                return 0;
            }
        }

        
Returns an Accessible representing the specified selected item
in the object.  If there isn't a selection, or there are
fewer items selected than the integer passed in, the return
value will be null.
Params:
i – the zero-based index of selected items
Returns:
an Accessible containing the selected item/**
         * Returns an Accessible representing the specified selected item
         * in the object.  If there isn't a selection, or there are
         * fewer items selected than the integer passed in, the return
         * value will be null.
         *
         * @param i the zero-based index of selected items
         * @return an Accessible containing the selected item
         */
        public Accessible getAccessibleSelection(int i) {
            // The JTree can have only one accessible child, the root.
            if (i == 0) {
                Object[] rootPath = new Object[1];
                rootPath[0] = treeModel.getRoot();
                if (rootPath[0] == null)
                    return null;

                TreePath childPath = new TreePath(rootPath);
                if (JTree.this.isPathSelected(childPath)) {
                    return new AccessibleJTreeNode(JTree.this, childPath, JTree.this);
                }
            }
            return null;
        }

        
Returns true if the current child of this object is selected.
Params:
i – the zero-based index of the child in this Accessible object.
See Also:
AccessibleContext.getAccessibleChild/**
         * Returns true if the current child of this object is selected.
         *
         * @param i the zero-based index of the child in this Accessible object.
         * @see AccessibleContext#getAccessibleChild
         */
        public boolean isAccessibleChildSelected(int i) {
            // The JTree can have only one accessible child, the root.
            if (i == 0) {
                Object[] rootPath = new Object[1];
                rootPath[0] = treeModel.getRoot();
                if (rootPath[0] == null)
                    return false;

                TreePath childPath = new TreePath(rootPath);
                return JTree.this.isPathSelected(childPath);
            } else {
                return false;
            }
        }

        
Adds the specified selected item in the object to the object's
selection.  If the object supports multiple selections,
the specified item is added to any existing selection, otherwise
it replaces any existing selection in the object.  If the
specified item is already selected, this method has no effect.
Params:
i – the zero-based index of selectable items/**
         * Adds the specified selected item in the object to the object's
         * selection.  If the object supports multiple selections,
         * the specified item is added to any existing selection, otherwise
         * it replaces any existing selection in the object.  If the
         * specified item is already selected, this method has no effect.
         *
         * @param i the zero-based index of selectable items
         */
        public void addAccessibleSelection(int i) {
           TreeModel model = JTree.this.getModel();
           if (model != null) {
               if (i == 0) {
                    Object[] objPath = {model.getRoot()};
                    if (objPath[0] == null)
                        return;

                   TreePath path = new TreePath(objPath);
                   JTree.this.addSelectionPath(path);
                }
            }
        }

        
Removes the specified selected item in the object from the object's
selection.  If the specified item isn't currently selected, this
method has no effect.
Params:
i – the zero-based index of selectable items/**
         * Removes the specified selected item in the object from the object's
         * selection.  If the specified item isn't currently selected, this
         * method has no effect.
         *
         * @param i the zero-based index of selectable items
         */
        public void removeAccessibleSelection(int i) {
            TreeModel model = JTree.this.getModel();
            if (model != null) {
                if (i == 0) {
                    Object[] objPath = {model.getRoot()};
                    if (objPath[0] == null)
                        return;

                    TreePath path = new TreePath(objPath);
                    JTree.this.removeSelectionPath(path);
                }
            }
        }

        
Clears the selection in the object, so that nothing in the
object is selected.
/**
         * Clears the selection in the object, so that nothing in the
         * object is selected.
         */
        public void clearAccessibleSelection() {
            int childCount = getAccessibleChildrenCount();
            for (int i = 0; i < childCount; i++) {
                removeAccessibleSelection(i);
            }
        }

        
Causes every selected item in the object to be selected
if the object supports multiple selections.
/**
         * Causes every selected item in the object to be selected
         * if the object supports multiple selections.
         */
        public void selectAllAccessibleSelection() {
            TreeModel model = JTree.this.getModel();
            if (model != null) {
                Object[] objPath = {model.getRoot()};
                if (objPath[0] == null)
                    return;

                TreePath path = new TreePath(objPath);
                JTree.this.addSelectionPath(path);
            }
        }

        
This class implements accessibility support for the
JTree child.  It provides an implementation of the
Java Accessibility API appropriate to tree nodes.
/**
         * This class implements accessibility support for the
         * <code>JTree</code> child.  It provides an implementation of the
         * Java Accessibility API appropriate to tree nodes.
         */
        protected class AccessibleJTreeNode extends AccessibleContext
            implements Accessible, AccessibleComponent, AccessibleSelection,
            AccessibleAction {

            private JTree tree = null;
            private TreeModel treeModel = null;
            private Object obj = null;
            private TreePath path = null;
            private Accessible accessibleParent = null;
            private int index = 0;
            private boolean isLeaf = false;

            
Constructs an AccessibleJTreeNode
Params:
t – an instance of JTree
p – an instance of TreePath
ap – an instance of Accessible
Since:
1.4/**
             * Constructs an AccessibleJTreeNode
             *
             * @param t an instance of {@code JTree}
             * @param p an instance of {@code TreePath}
             * @param ap an instance of {@code Accessible}
             * @since 1.4
             */
            public AccessibleJTreeNode(JTree t, TreePath p, Accessible ap) {
                tree = t;
                path = p;
                accessibleParent = ap;
                treeModel = t.getModel();
                obj = p.getLastPathComponent();
                if (treeModel != null) {
                    isLeaf = treeModel.isLeaf(obj);
                }
            }

            private TreePath getChildTreePath(int i) {
                // Tree nodes can't be so complex that they have
                // two sets of children -> we're ignoring that case
                if (i < 0 || i >= getAccessibleChildrenCount()) {
                    return null;
                } else {
                    Object childObj = treeModel.getChild(obj, i);
                    Object[] objPath = path.getPath();
                    Object[] objChildPath = new Object[objPath.length+1];
                    java.lang.System.arraycopy(objPath, 0, objChildPath, 0, objPath.length);
                    objChildPath[objChildPath.length-1] = childObj;
                    return new TreePath(objChildPath);
                }
            }

            
Get the AccessibleContext associated with this tree node.
In the implementation of the Java Accessibility API for
this class, return this object, which is its own
AccessibleContext.
Returns:
this object/**
             * Get the AccessibleContext associated with this tree node.
             * In the implementation of the Java Accessibility API for
             * this class, return this object, which is its own
             * AccessibleContext.
             *
             * @return this object
             */
            public AccessibleContext getAccessibleContext() {
                return this;
            }

            private AccessibleContext getCurrentAccessibleContext() {
                Component c = getCurrentComponent();
                if (c instanceof Accessible) {
                    return c.getAccessibleContext();
                } else {
                    return null;
                }
            }

            private Component getCurrentComponent() {
                // is the object visible?
                // if so, get row, selected, focus & leaf state,
                // and then get the renderer component and return it
                if (tree.isVisible(path)) {
                    TreeCellRenderer r = tree.getCellRenderer();
                    if (r == null) {
                        return null;
                    }
                    TreeUI ui = tree.getUI();
                    if (ui != null) {
                        int row = ui.getRowForPath(JTree.this, path);
                        boolean selected = tree.isPathSelected(path);
                        boolean expanded = tree.isExpanded(path);
                        boolean hasFocus = false; // how to tell?? -PK
                        return r.getTreeCellRendererComponent(tree, obj,
                            selected, expanded, isLeaf, row, hasFocus);
                    }
                }
                return null;
            }

        // AccessibleContext methods

             
Get the accessible name of this object.
Returns:
the localized name of the object; null if this
object does not have a name/**
              * Get the accessible name of this object.
              *
              * @return the localized name of the object; null if this
              * object does not have a name
              */
             public String getAccessibleName() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    String name = ac.getAccessibleName();
                    if ((name != null) && (name != "")) {
                        return ac.getAccessibleName();
                    } else {
                        return null;
                    }
                }
                if ((accessibleName != null) && (accessibleName != "")) {
                    return accessibleName;
                } else {
                    // fall back to the client property
                    return (String)getClientProperty(AccessibleContext.ACCESSIBLE_NAME_PROPERTY);
                }
            }

            
Set the localized accessible name of this object.
Params:
s – the new localized name of the object./**
             * Set the localized accessible name of this object.
             *
             * @param s the new localized name of the object.
             */
            public void setAccessibleName(String s) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    ac.setAccessibleName(s);
                } else {
                    super.setAccessibleName(s);
                }
            }

            //
            // *** should check tooltip text for desc. (needs MouseEvent)
            //
            
Get the accessible description of this object.
Returns:
the localized description of the object; null if
this object does not have a description/**
             * Get the accessible description of this object.
             *
             * @return the localized description of the object; null if
             * this object does not have a description
             */
            public String getAccessibleDescription() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    return ac.getAccessibleDescription();
                } else {
                    return super.getAccessibleDescription();
                }
            }

            
Set the accessible description of this object.
Params:
s – the new localized description of the object/**
             * Set the accessible description of this object.
             *
             * @param s the new localized description of the object
             */
            public void setAccessibleDescription(String s) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    ac.setAccessibleDescription(s);
                } else {
                    super.setAccessibleDescription(s);
                }
            }

            
Get the role of this object.
See Also:
AccessibleRole
Returns:
an instance of AccessibleRole describing the role of the object/**
             * Get the role of this object.
             *
             * @return an instance of AccessibleRole describing the role of the object
             * @see AccessibleRole
             */
            public AccessibleRole getAccessibleRole() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    return ac.getAccessibleRole();
                } else {
                    return AccessibleRole.UNKNOWN;
                }
            }

            
Get the state set of this object.
See Also:
AccessibleState
Returns:
an instance of AccessibleStateSet containing the
current state set of the object/**
             * Get the state set of this object.
             *
             * @return an instance of AccessibleStateSet containing the
             * current state set of the object
             * @see AccessibleState
             */
            public AccessibleStateSet getAccessibleStateSet() {
                AccessibleContext ac = getCurrentAccessibleContext();
                AccessibleStateSet states;
                if (ac != null) {
                    states = ac.getAccessibleStateSet();
                } else {
                    states = new AccessibleStateSet();
                }
                // need to test here, 'cause the underlying component
                // is a cellRenderer, which is never showing...
                if (isShowing()) {
                    states.add(AccessibleState.SHOWING);
                } else if (states.contains(AccessibleState.SHOWING)) {
                    states.remove(AccessibleState.SHOWING);
                }
                if (isVisible()) {
                    states.add(AccessibleState.VISIBLE);
                } else if (states.contains(AccessibleState.VISIBLE)) {
                    states.remove(AccessibleState.VISIBLE);
                }
                if (tree.isPathSelected(path)){
                    states.add(AccessibleState.SELECTED);
                }
                if (path == getLeadSelectionPath()) {
                    states.add(AccessibleState.ACTIVE);
                }
                if (!isLeaf) {
                    states.add(AccessibleState.EXPANDABLE);
                }
                if (tree.isExpanded(path)) {
                    states.add(AccessibleState.EXPANDED);
                } else {
                    states.add(AccessibleState.COLLAPSED);
                }
                if (tree.isEditable()) {
                    states.add(AccessibleState.EDITABLE);
                }
                return states;
            }

            
Get the Accessible parent of this object.
Returns:
the Accessible parent of this object; null if this
object does not have an Accessible parent/**
             * Get the Accessible parent of this object.
             *
             * @return the Accessible parent of this object; null if this
             * object does not have an Accessible parent
             */
            public Accessible getAccessibleParent() {
                // someone wants to know, so we need to create our parent
                // if we don't have one (hey, we're a talented kid!)
                if (accessibleParent == null) {
                    Object[] objPath = path.getPath();
                    if (objPath.length > 1) {
                        Object objParent = objPath[objPath.length-2];
                        if (treeModel != null) {
                            index = treeModel.getIndexOfChild(objParent, obj);
                        }
                        Object[] objParentPath = new Object[objPath.length-1];
                        java.lang.System.arraycopy(objPath, 0, objParentPath,
                                                   0, objPath.length-1);
                        TreePath parentPath = new TreePath(objParentPath);
                        accessibleParent = new AccessibleJTreeNode(tree,
                                                                   parentPath,
                                                                   null);
                        this.setAccessibleParent(accessibleParent);
                    } else if (treeModel != null) {
                        accessibleParent = tree; // we're the top!
                        index = 0; // we're an only child!
                        this.setAccessibleParent(accessibleParent);
                    }
                }
                return accessibleParent;
            }

            
Get the index of this object in its accessible parent.
See Also:
getAccessibleParent
Returns:
the index of this object in its parent; -1 if this
object does not have an accessible parent./**
             * Get the index of this object in its accessible parent.
             *
             * @return the index of this object in its parent; -1 if this
             * object does not have an accessible parent.
             * @see #getAccessibleParent
             */
            public int getAccessibleIndexInParent() {
                // index is invalid 'till we have an accessibleParent...
                if (accessibleParent == null) {
                    getAccessibleParent();
                }
                Object[] objPath = path.getPath();
                if (objPath.length > 1) {
                    Object objParent = objPath[objPath.length-2];
                    if (treeModel != null) {
                        index = treeModel.getIndexOfChild(objParent, obj);
                    }
                }
                return index;
            }

            
Returns the number of accessible children in the object.
Returns:
the number of accessible children in the object./**
             * Returns the number of accessible children in the object.
             *
             * @return the number of accessible children in the object.
             */
            public int getAccessibleChildrenCount() {
                // Tree nodes can't be so complex that they have
                // two sets of children -> we're ignoring that case
                return treeModel.getChildCount(obj);
            }

            
Return the specified Accessible child of the object.
Params:
i – zero-based index of child
Returns:
the Accessible child of the object/**
             * Return the specified Accessible child of the object.
             *
             * @param i zero-based index of child
             * @return the Accessible child of the object
             */
            public Accessible getAccessibleChild(int i) {
                // Tree nodes can't be so complex that they have
                // two sets of children -> we're ignoring that case
                if (i < 0 || i >= getAccessibleChildrenCount()) {
                    return null;
                } else {
                    Object childObj = treeModel.getChild(obj, i);
                    Object[] objPath = path.getPath();
                    Object[] objChildPath = new Object[objPath.length+1];
                    java.lang.System.arraycopy(objPath, 0, objChildPath, 0, objPath.length);
                    objChildPath[objChildPath.length-1] = childObj;
                    TreePath childPath = new TreePath(objChildPath);
                    return new AccessibleJTreeNode(JTree.this, childPath, this);
                }
            }

            
Gets the locale of the component. If the component does not have
a locale, then the locale of its parent is returned.
Throws:
IllegalComponentStateException – 
If the Component does not have its own locale and has not yet
been added to a containment hierarchy such that the locale can be
determined from the containing parent.
See Also:
setLocale
Returns:
This component's locale. If this component does not have
a locale, the locale of its parent is returned./**
             * Gets the locale of the component. If the component does not have
             * a locale, then the locale of its parent is returned.
             *
             * @return This component's locale. If this component does not have
             * a locale, the locale of its parent is returned.
             * @exception IllegalComponentStateException
             * If the Component does not have its own locale and has not yet
             * been added to a containment hierarchy such that the locale can be
             * determined from the containing parent.
             * @see #setLocale
             */
            public Locale getLocale() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    return ac.getLocale();
                } else {
                    return tree.getLocale();
                }
            }

            
Add a PropertyChangeListener to the listener list.
The listener is registered for all properties.
Params:
l –  The PropertyChangeListener to be added/**
             * Add a PropertyChangeListener to the listener list.
             * The listener is registered for all properties.
             *
             * @param l  The PropertyChangeListener to be added
             */
            public void addPropertyChangeListener(PropertyChangeListener l) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    ac.addPropertyChangeListener(l);
                } else {
                    super.addPropertyChangeListener(l);
                }
            }

            
Remove a PropertyChangeListener from the listener list.
This removes a PropertyChangeListener that was registered
for all properties.
Params:
l –  The PropertyChangeListener to be removed/**
             * Remove a PropertyChangeListener from the listener list.
             * This removes a PropertyChangeListener that was registered
             * for all properties.
             *
             * @param l  The PropertyChangeListener to be removed
             */
            public void removePropertyChangeListener(PropertyChangeListener l) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    ac.removePropertyChangeListener(l);
                } else {
                    super.removePropertyChangeListener(l);
                }
            }

            
Get the AccessibleAction associated with this object.  In the
implementation of the Java Accessibility API for this class,
return this object, which is responsible for implementing the
AccessibleAction interface on behalf of itself.
Returns:
this object/**
             * Get the AccessibleAction associated with this object.  In the
             * implementation of the Java Accessibility API for this class,
             * return this object, which is responsible for implementing the
             * AccessibleAction interface on behalf of itself.
             *
             * @return this object
             */
            public AccessibleAction getAccessibleAction() {
                return this;
            }

            
Get the AccessibleComponent associated with this object.  In the
implementation of the Java Accessibility API for this class,
return this object, which is responsible for implementing the
AccessibleComponent interface on behalf of itself.
Returns:
this object/**
             * Get the AccessibleComponent associated with this object.  In the
             * implementation of the Java Accessibility API for this class,
             * return this object, which is responsible for implementing the
             * AccessibleComponent interface on behalf of itself.
             *
             * @return this object
             */
            public AccessibleComponent getAccessibleComponent() {
                return this; // to override getBounds()
            }

            
Get the AccessibleSelection associated with this object if one
exists.  Otherwise return null.
Returns:
the AccessibleSelection, or null/**
             * Get the AccessibleSelection associated with this object if one
             * exists.  Otherwise return null.
             *
             * @return the AccessibleSelection, or null
             */
            public AccessibleSelection getAccessibleSelection() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null && isLeaf) {
                    return getCurrentAccessibleContext().getAccessibleSelection();
                } else {
                    return this;
                }
            }

            
Get the AccessibleText associated with this object if one
exists.  Otherwise return null.
Returns:
the AccessibleText, or null/**
             * Get the AccessibleText associated with this object if one
             * exists.  Otherwise return null.
             *
             * @return the AccessibleText, or null
             */
            public AccessibleText getAccessibleText() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    return getCurrentAccessibleContext().getAccessibleText();
                } else {
                    return null;
                }
            }

            
Get the AccessibleValue associated with this object if one
exists.  Otherwise return null.
Returns:
the AccessibleValue, or null/**
             * Get the AccessibleValue associated with this object if one
             * exists.  Otherwise return null.
             *
             * @return the AccessibleValue, or null
             */
            public AccessibleValue getAccessibleValue() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    return getCurrentAccessibleContext().getAccessibleValue();
                } else {
                    return null;
                }
            }


        // AccessibleComponent methods

            
Get the background color of this object.
Returns:
the background color, if supported, of the object;
otherwise, null/**
             * Get the background color of this object.
             *
             * @return the background color, if supported, of the object;
             * otherwise, null
             */
            public Color getBackground() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).getBackground();
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        return c.getBackground();
                    } else {
                        return null;
                    }
                }
            }

            
Set the background color of this object.
Params:
c – the new Color for the background/**
             * Set the background color of this object.
             *
             * @param c the new Color for the background
             */
            public void setBackground(Color c) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).setBackground(c);
                } else {
                    Component cp = getCurrentComponent();
                    if (cp != null) {
                        cp.setBackground(c);
                    }
                }
            }


            
Get the foreground color of this object.
Returns:
the foreground color, if supported, of the object;
otherwise, null/**
             * Get the foreground color of this object.
             *
             * @return the foreground color, if supported, of the object;
             * otherwise, null
             */
            public Color getForeground() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).getForeground();
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        return c.getForeground();
                    } else {
                        return null;
                    }
                }
            }

            public void setForeground(Color c) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).setForeground(c);
                } else {
                    Component cp = getCurrentComponent();
                    if (cp != null) {
                        cp.setForeground(c);
                    }
                }
            }

            public Cursor getCursor() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).getCursor();
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        return c.getCursor();
                    } else {
                        Accessible ap = getAccessibleParent();
                        if (ap instanceof AccessibleComponent) {
                            return ((AccessibleComponent) ap).getCursor();
                        } else {
                            return null;
                        }
                    }
                }
            }

            public void setCursor(Cursor c) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).setCursor(c);
                } else {
                    Component cp = getCurrentComponent();
                    if (cp != null) {
                        cp.setCursor(c);
                    }
                }
            }

            public Font getFont() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).getFont();
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        return c.getFont();
                    } else {
                        return null;
                    }
                }
            }

            public void setFont(Font f) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).setFont(f);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        c.setFont(f);
                    }
                }
            }

            public FontMetrics getFontMetrics(Font f) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).getFontMetrics(f);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        return c.getFontMetrics(f);
                    } else {
                        return null;
                    }
                }
            }

            public boolean isEnabled() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).isEnabled();
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        return c.isEnabled();
                    } else {
                        return false;
                    }
                }
            }

            public void setEnabled(boolean b) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).setEnabled(b);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        c.setEnabled(b);
                    }
                }
            }

            public boolean isVisible() {
                Rectangle pathBounds = tree.getPathBounds(path);
                Rectangle parentBounds = tree.getVisibleRect();
                return pathBounds != null && parentBounds != null &&
                        parentBounds.intersects(pathBounds);
            }

            public void setVisible(boolean b) {
            }

            public boolean isShowing() {
                return (tree.isShowing() && isVisible());
            }

            public boolean contains(Point p) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    Rectangle r = ((AccessibleComponent) ac).getBounds();
                    return r.contains(p);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        Rectangle r = c.getBounds();
                        return r.contains(p);
                    } else {
                        return getBounds().contains(p);
                    }
                }
            }

            public Point getLocationOnScreen() {
                if (tree != null) {
                    Point treeLocation = tree.getLocationOnScreen();
                    Rectangle pathBounds = tree.getPathBounds(path);
                    if (treeLocation != null && pathBounds != null) {
                        Point nodeLocation = new Point(pathBounds.x,
                                                       pathBounds.y);
                        nodeLocation.translate(treeLocation.x, treeLocation.y);
                        return nodeLocation;
                    } else {
                        return null;
                    }
                } else {
                    return null;
                }
            }

            
Returns the relative location of the node
Returns:
the relative location of the node/**
             * Returns the relative location of the node
             *
             * @return the relative location of the node
             */
            protected Point getLocationInJTree() {
                Rectangle r = tree.getPathBounds(path);
                if (r != null) {
                    return r.getLocation();
                } else {
                    return null;
                }
            }

            public Point getLocation() {
                Rectangle r = getBounds();
                if (r != null) {
                    return r.getLocation();
                } else {
                    return null;
                }
            }

            public void setLocation(Point p) {
            }

            public Rectangle getBounds() {
                Rectangle r = tree.getPathBounds(path);
                Accessible parent = getAccessibleParent();
                if (parent != null) {
                    if (parent instanceof AccessibleJTreeNode) {
                        Point parentLoc = ((AccessibleJTreeNode) parent).getLocationInJTree();
                        if (parentLoc != null && r != null) {
                            r.translate(-parentLoc.x, -parentLoc.y);
                        } else {
                            return null;        // not visible!
                        }
                    }
                }
                return r;
            }

            public void setBounds(Rectangle r) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).setBounds(r);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        c.setBounds(r);
                    }
                }
            }

            public Dimension getSize() {
                return getBounds().getSize();
            }

            public void setSize (Dimension d) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).setSize(d);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        c.setSize(d);
                    }
                }
            }

            
Returns the Accessible child, if one exists,
contained at the local coordinate Point.
Otherwise returns null.
Params:
p – point in local coordinates of this
   Accessible
Returns:
the Accessible, if it exists,
   at the specified location; else null/**
             * Returns the <code>Accessible</code> child, if one exists,
             * contained at the local coordinate <code>Point</code>.
             * Otherwise returns <code>null</code>.
             *
             * @param p point in local coordinates of this
             *    <code>Accessible</code>
             * @return the <code>Accessible</code>, if it exists,
             *    at the specified location; else <code>null</code>
             */
            public Accessible getAccessibleAt(Point p) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).getAccessibleAt(p);
                } else {
                    return null;
                }
            }

            @SuppressWarnings("deprecation")
            public boolean isFocusTraversable() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    return ((AccessibleComponent) ac).isFocusTraversable();
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        return c.isFocusTraversable();
                    } else {
                        return false;
                    }
                }
            }

            public void requestFocus() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).requestFocus();
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        c.requestFocus();
                    }
                }
            }

            public void addFocusListener(FocusListener l) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).addFocusListener(l);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        c.addFocusListener(l);
                    }
                }
            }

            public void removeFocusListener(FocusListener l) {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac instanceof AccessibleComponent) {
                    ((AccessibleComponent) ac).removeFocusListener(l);
                } else {
                    Component c = getCurrentComponent();
                    if (c != null) {
                        c.removeFocusListener(l);
                    }
                }
            }

        // AccessibleSelection methods

            
Returns the number of items currently selected.
If no items are selected, the return value will be 0.
Returns:
the number of items currently selected./**
             * Returns the number of items currently selected.
             * If no items are selected, the return value will be 0.
             *
             * @return the number of items currently selected.
             */
            public int getAccessibleSelectionCount() {
                int count = 0;
                int childCount = getAccessibleChildrenCount();
                for (int i = 0; i < childCount; i++) {
                    TreePath childPath = getChildTreePath(i);
                    if (tree.isPathSelected(childPath)) {
                       count++;
                    }
                }
                return count;
            }

            
Returns an Accessible representing the specified selected item
in the object.  If there isn't a selection, or there are
fewer items selected than the integer passed in, the return
value will be null.
Params:
i – the zero-based index of selected items
Returns:
an Accessible containing the selected item/**
             * Returns an Accessible representing the specified selected item
             * in the object.  If there isn't a selection, or there are
             * fewer items selected than the integer passed in, the return
             * value will be null.
             *
             * @param i the zero-based index of selected items
             * @return an Accessible containing the selected item
             */
            public Accessible getAccessibleSelection(int i) {
                int childCount = getAccessibleChildrenCount();
                if (i < 0 || i >= childCount) {
                    return null;        // out of range
                }
                int count = 0;
                for (int j = 0; j < childCount && i >= count; j++) {
                    TreePath childPath = getChildTreePath(j);
                    if (tree.isPathSelected(childPath)) {
                        if (count == i) {
                            return new AccessibleJTreeNode(tree, childPath, this);
                        } else {
                            count++;
                        }
                    }
                }
                return null;
            }

            
Returns true if the current child of this object is selected.
Params:
i – the zero-based index of the child in this Accessible
object.
See Also:
AccessibleContext.getAccessibleChild/**
             * Returns true if the current child of this object is selected.
             *
             * @param i the zero-based index of the child in this Accessible
             * object.
             * @see AccessibleContext#getAccessibleChild
             */
            public boolean isAccessibleChildSelected(int i) {
                int childCount = getAccessibleChildrenCount();
                if (i < 0 || i >= childCount) {
                    return false;       // out of range
                } else {
                    TreePath childPath = getChildTreePath(i);
                    return tree.isPathSelected(childPath);
                }
            }

            
Adds the specified selected item in the object to the object's
selection.  If the object supports multiple selections,
the specified item is added to any existing selection, otherwise
it replaces any existing selection in the object.  If the
specified item is already selected, this method has no effect.
Params:
i – the zero-based index of selectable items/**
             * Adds the specified selected item in the object to the object's
             * selection.  If the object supports multiple selections,
             * the specified item is added to any existing selection, otherwise
             * it replaces any existing selection in the object.  If the
             * specified item is already selected, this method has no effect.
             *
             * @param i the zero-based index of selectable items
             */
            public void addAccessibleSelection(int i) {
               TreeModel model = JTree.this.getModel();
               if (model != null) {
                   if (i >= 0 && i < getAccessibleChildrenCount()) {
                       TreePath path = getChildTreePath(i);
                       JTree.this.addSelectionPath(path);
                    }
                }
            }

            
Removes the specified selected item in the object from the
object's
selection.  If the specified item isn't currently selected, this
method has no effect.
Params:
i – the zero-based index of selectable items/**
             * Removes the specified selected item in the object from the
             * object's
             * selection.  If the specified item isn't currently selected, this
             * method has no effect.
             *
             * @param i the zero-based index of selectable items
             */
            public void removeAccessibleSelection(int i) {
               TreeModel model = JTree.this.getModel();
               if (model != null) {
                   if (i >= 0 && i < getAccessibleChildrenCount()) {
                       TreePath path = getChildTreePath(i);
                       JTree.this.removeSelectionPath(path);
                    }
                }
            }

            
Clears the selection in the object, so that nothing in the
object is selected.
/**
             * Clears the selection in the object, so that nothing in the
             * object is selected.
             */
            public void clearAccessibleSelection() {
                int childCount = getAccessibleChildrenCount();
                for (int i = 0; i < childCount; i++) {
                    removeAccessibleSelection(i);
                }
            }

            
Causes every selected item in the object to be selected
if the object supports multiple selections.
/**
             * Causes every selected item in the object to be selected
             * if the object supports multiple selections.
             */
            public void selectAllAccessibleSelection() {
               TreeModel model = JTree.this.getModel();
               if (model != null) {
                   int childCount = getAccessibleChildrenCount();
                   TreePath path;
                   for (int i = 0; i < childCount; i++) {
                       path = getChildTreePath(i);
                       JTree.this.addSelectionPath(path);
                   }
                }
            }

        // AccessibleAction methods

            
Returns the number of accessible actions available in this
tree node.  If this node is not a leaf, there is at least
one action (toggle expand), in addition to any available
on the object behind the TreeCellRenderer.
Returns:
the number of Actions in this object/**
             * Returns the number of accessible actions available in this
             * tree node.  If this node is not a leaf, there is at least
             * one action (toggle expand), in addition to any available
             * on the object behind the TreeCellRenderer.
             *
             * @return the number of Actions in this object
             */
            public int getAccessibleActionCount() {
                AccessibleContext ac = getCurrentAccessibleContext();
                if (ac != null) {
                    AccessibleAction aa = ac.getAccessibleAction();
                    if (aa != null) {
                        return (aa.getAccessibleActionCount() + (isLeaf ? 0 : 1));
                    }
                }
                return isLeaf ? 0 : 1;
            }

            
Return a description of the specified action of the tree node.
If this node is not a leaf, there is at least one action
description (toggle expand), in addition to any available
on the object behind the TreeCellRenderer.
Params:
i – zero-based index of the actions
Returns:
a description of the action/**
             * Return a description of the specified action of the tree node.
             * If this node is not a leaf, there is at least one action
             * description (toggle expand), in addition to any available
             * on the object behind the TreeCellRenderer.
             *
             * @param i zero-based index of the actions
             * @return a description of the action
             */
            public String getAccessibleActionDescription(int i) {
                if (i < 0 || i >= getAccessibleActionCount()) {
                    return null;
                }
                AccessibleContext ac = getCurrentAccessibleContext();
                if (i == 0) {
                    // TIGER - 4766636
                    return AccessibleAction.TOGGLE_EXPAND;
                } else if (ac != null) {
                    AccessibleAction aa = ac.getAccessibleAction();
                    if (aa != null) {
                        return aa.getAccessibleActionDescription(i - 1);
                    }
                }
                return null;
            }

            
Perform the specified Action on the tree node.  If this node
is not a leaf, there is at least one action which can be
done (toggle expand), in addition to any available on the
object behind the TreeCellRenderer.
Params:
i – zero-based index of actions
Returns:
true if the action was performed; else false./**
             * Perform the specified Action on the tree node.  If this node
             * is not a leaf, there is at least one action which can be
             * done (toggle expand), in addition to any available on the
             * object behind the TreeCellRenderer.
             *
             * @param i zero-based index of actions
             * @return true if the action was performed; else false.
             */
            public boolean doAccessibleAction(int i) {
                if (i < 0 || i >= getAccessibleActionCount()) {
                    return false;
                }
                AccessibleContext ac = getCurrentAccessibleContext();
                if (i == 0) {
                    if (JTree.this.isExpanded(path)) {
                        JTree.this.collapsePath(path);
                    } else {
                        JTree.this.expandPath(path);
                    }
                    return true;
                } else if (ac != null) {
                    AccessibleAction aa = ac.getAccessibleAction();
                    if (aa != null) {
                        return aa.doAccessibleAction(i - 1);
                    }
                }
                return false;
            }

        } // inner class AccessibleJTreeNode

    }  // inner class AccessibleJTree

} // End of class JTree