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package javax.swing;

import javax.swing.event.*;
import java.io.Serializable;
import java.util.EventListener;


The abstract definition for the data model that provides
a List with its contents.


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:Hans Muller
Type parameters:
  • <E> – the type of the elements of this model
Since:1.2
/**
 * The abstract definition for the data model that provides
 * a <code>List</code> with its contents.
 * <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}.
 *
 * @param <E> the type of the elements of this model
 *
 * @author Hans Muller
 * @since 1.2
 */
@SuppressWarnings("serial") // Same-version serialization only
public abstract class AbstractListModel<E> implements ListModel<E>, Serializable
{
    
The listener list.

/**
     * The listener list.
     */
    protected EventListenerList listenerList = new EventListenerList();


    
Adds a listener to the list that's notified each time a change
to the data model occurs.

Params:
  • l – the ListDataListener to be added
/**
     * Adds a listener to the list that's notified each time a change
     * to the data model occurs.
     *
     * @param l the <code>ListDataListener</code> to be added
     */
    public void addListDataListener(ListDataListener l) {
        listenerList.add(ListDataListener.class, l);
    }


    
Removes a listener from the list that's notified each time a
change to the data model occurs.

Params:
  • l – the ListDataListener to be removed
/**
     * Removes a listener from the list that's notified each time a
     * change to the data model occurs.
     *
     * @param l the <code>ListDataListener</code> to be removed
     */
    public void removeListDataListener(ListDataListener l) {
        listenerList.remove(ListDataListener.class, l);
    }


    
Returns an array of all the list data listeners
registered on this AbstractListModel.

See Also:
Returns:all of this model's ListDataListeners,
        or an empty array if no list data listeners
        are currently registered
Since:1.4
/**
     * Returns an array of all the list data listeners
     * registered on this <code>AbstractListModel</code>.
     *
     * @return all of this model's <code>ListDataListener</code>s,
     *         or an empty array if no list data listeners
     *         are currently registered
     *
     * @see #addListDataListener
     * @see #removeListDataListener
     *
     * @since 1.4
     */
    public ListDataListener[] getListDataListeners() {
        return listenerList.getListeners(ListDataListener.class);
    }


    
AbstractListModel subclasses must call this method
after
one or more elements of the list change.  The changed elements
are specified by the closed interval index0, index1 -- the endpoints
are included.  Note that
index0 need not be less than or equal to index1.

Params:
  • source – the ListModel that changed, typically "this"
  • index0 – one end of the new interval
  • index1 – the other end of the new interval
See Also:
/**
     * <code>AbstractListModel</code> subclasses must call this method
     * <b>after</b>
     * one or more elements of the list change.  The changed elements
     * are specified by the closed interval index0, index1 -- the endpoints
     * are included.  Note that
     * index0 need not be less than or equal to index1.
     *
     * @param source the <code>ListModel</code> that changed, typically "this"
     * @param index0 one end of the new interval
     * @param index1 the other end of the new interval
     * @see EventListenerList
     * @see DefaultListModel
     */
    protected void fireContentsChanged(Object source, int index0, int index1)
    {
        Object[] listeners = listenerList.getListenerList();
        ListDataEvent e = null;

        for (int i = listeners.length - 2; i >= 0; i -= 2) {
            if (listeners[i] == ListDataListener.class) {
                if (e == null) {
                    e = new ListDataEvent(source, ListDataEvent.CONTENTS_CHANGED, index0, index1);
                }
                ((ListDataListener)listeners[i+1]).contentsChanged(e);
            }
        }
    }


    
AbstractListModel subclasses must call this method
after
one or more elements are added to the model.  The new elements
are specified by a closed interval index0, index1 -- the enpoints
are included.  Note that
index0 need not be less than or equal to index1.

Params:
  • source – the ListModel that changed, typically "this"
  • index0 – one end of the new interval
  • index1 – the other end of the new interval
See Also:
/**
     * <code>AbstractListModel</code> subclasses must call this method
     * <b>after</b>
     * one or more elements are added to the model.  The new elements
     * are specified by a closed interval index0, index1 -- the enpoints
     * are included.  Note that
     * index0 need not be less than or equal to index1.
     *
     * @param source the <code>ListModel</code> that changed, typically "this"
     * @param index0 one end of the new interval
     * @param index1 the other end of the new interval
     * @see EventListenerList
     * @see DefaultListModel
     */
    protected void fireIntervalAdded(Object source, int index0, int index1)
    {
        Object[] listeners = listenerList.getListenerList();
        ListDataEvent e = null;

        for (int i = listeners.length - 2; i >= 0; i -= 2) {
            if (listeners[i] == ListDataListener.class) {
                if (e == null) {
                    e = new ListDataEvent(source, ListDataEvent.INTERVAL_ADDED, index0, index1);
                }
                ((ListDataListener)listeners[i+1]).intervalAdded(e);
            }
        }
    }


    
AbstractListModel subclasses must call this method
after one or more elements are removed from the model.
index0 and index1 are the end points
of the interval that's been removed.  Note that index0
need not be less than or equal to index1.

Params:
  • source – the ListModel that changed, typically "this"
  • index0 – one end of the removed interval,
              including index0
  • index1 – the other end of the removed interval,
              including index1
See Also:
/**
     * <code>AbstractListModel</code> subclasses must call this method
     * <b>after</b> one or more elements are removed from the model.
     * <code>index0</code> and <code>index1</code> are the end points
     * of the interval that's been removed.  Note that <code>index0</code>
     * need not be less than or equal to <code>index1</code>.
     *
     * @param source the <code>ListModel</code> that changed, typically "this"
     * @param index0 one end of the removed interval,
     *               including <code>index0</code>
     * @param index1 the other end of the removed interval,
     *               including <code>index1</code>
     * @see EventListenerList
     * @see DefaultListModel
     */
    protected void fireIntervalRemoved(Object source, int index0, int index1)
    {
        Object[] listeners = listenerList.getListenerList();
        ListDataEvent e = null;

        for (int i = listeners.length - 2; i >= 0; i -= 2) {
            if (listeners[i] == ListDataListener.class) {
                if (e == null) {
                    e = new ListDataEvent(source, ListDataEvent.INTERVAL_REMOVED, index0, index1);
                }
                ((ListDataListener)listeners[i+1]).intervalRemoved(e);
            }
        }
    }

    
Returns an array of all the objects currently registered as
FooListeners
upon this model.
FooListeners
are registered using the addFooListener method.


You can specify the listenerType argument
with a class literal, such as FooListener.class.
For example, you can query a list model
m
for its list data listeners
with the following code:

ListDataListener[] ldls = (ListDataListener[])(m.getListeners(ListDataListener.class));

If no such listeners exist,
this method returns an empty array.

Params:
  • listenerType –  the type of listeners requested;
         this parameter should specify an interface
         that descends from java.util.EventListener
Type parameters:
  • <T> – the type of EventListener class being requested
Throws:
  • ClassCastException – if listenerType doesn't
         specify a class or interface that implements
         java.util.EventListener
See Also:
Returns:an array of all objects registered as
         FooListeners
         on this model,
         or an empty array if no such
         listeners have been added
Since:1.3
/**
     * Returns an array of all the objects currently registered as
     * <code><em>Foo</em>Listener</code>s
     * upon this model.
     * <code><em>Foo</em>Listener</code>s
     * are registered using the <code>add<em>Foo</em>Listener</code> method.
     * <p>
     * You can specify the <code>listenerType</code> argument
     * with a class literal, such as <code><em>Foo</em>Listener.class</code>.
     * For example, you can query a list model
     * <code>m</code>
     * for its list data listeners
     * with the following code:
     *
     * <pre>ListDataListener[] ldls = (ListDataListener[])(m.getListeners(ListDataListener.class));</pre>
     *
     * If no such listeners exist,
     * this method returns an empty array.
     *
     * @param <T> the type of {@code EventListener} class being requested
     * @param listenerType  the type of listeners requested;
     *          this parameter should specify an interface
     *          that descends from <code>java.util.EventListener</code>
     * @return an array of all objects registered as
     *          <code><em>Foo</em>Listener</code>s
     *          on this model,
     *          or an empty array if no such
     *          listeners have been added
     * @exception ClassCastException if <code>listenerType</code> doesn't
     *          specify a class or interface that implements
     *          <code>java.util.EventListener</code>
     *
     * @see #getListDataListeners
     *
     * @since 1.3
     */
    public <T extends EventListener> T[] getListeners(Class<T> listenerType) {
        return listenerList.getListeners(listenerType);
    }
}