/*
 * Copyright (c) 2000, 2005, 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
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

// SAX default implementation for AttributeList.
// http://www.saxproject.org
// No warranty; no copyright -- use this as you will.
// $Id: AttributeListImpl.java,v 1.2 2004/11/03 22:53:08 jsuttor Exp $

package org.xml.sax.helpers;

import org.xml.sax.AttributeList;

import java.util.Vector;


Default implementation for AttributeList.

This module, both source code and documentation, is in the
Public Domain, and comes with NO WARRANTY.
See http://www.saxproject.org
for further information.

AttributeList implements the deprecated SAX1 AttributeList interface, and has been replaced by the new SAX2 
AttributesImpl interface.
This class provides a convenience implementation of the SAX AttributeList interface. This implementation is useful both for SAX parser writers, who can use it to provide attributes to the application, and for SAX application writers, who can use it to create a persistent copy of an element's attribute specifications:
private AttributeList myatts;
public void startElement (String name, AttributeList atts)
{
             // create a persistent copy of the attribute list
             // for use outside this method
  myatts = new AttributeListImpl(atts);
  [...]
}

Please note that SAX parsers are not required to use this
class to provide an implementation of AttributeList; it is
supplied only as an optional convenience.  In particular,
parser writers are encouraged to invent more efficient
implementations.
Author:
David Megginson
See Also:
AttributeList
DocumentHandler.startElement
Deprecated:
This class implements a deprecated interface, AttributeList; that interface has been replaced by Attributes, which is implemented in the 
           AttributesImpl helper class.
Since:
1.4, SAX 1.0/**
 * Default implementation for AttributeList.
 *
 * <blockquote>
 * <em>This module, both source code and documentation, is in the
 * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
 * See <a href='http://www.saxproject.org'>http://www.saxproject.org</a>
 * for further information.
 * </blockquote>
 *
 * <p>AttributeList implements the deprecated SAX1 {@link
 * org.xml.sax.AttributeList AttributeList} interface, and has been
 * replaced by the new SAX2 {@link org.xml.sax.helpers.AttributesImpl
 * AttributesImpl} interface.</p>
 *
 * <p>This class provides a convenience implementation of the SAX
 * {@link org.xml.sax.AttributeList AttributeList} interface.  This
 * implementation is useful both for SAX parser writers, who can use
 * it to provide attributes to the application, and for SAX application
 * writers, who can use it to create a persistent copy of an element's
 * attribute specifications:</p>
 *
 * <pre>
 * private AttributeList myatts;
 *
 * public void startElement (String name, AttributeList atts)
 * {
 *              // create a persistent copy of the attribute list
 *              // for use outside this method
 *   myatts = new AttributeListImpl(atts);
 *   [...]
 * }
 * </pre>
 *
 * <p>Please note that SAX parsers are not required to use this
 * class to provide an implementation of AttributeList; it is
 * supplied only as an optional convenience.  In particular,
 * parser writers are encouraged to invent more efficient
 * implementations.</p>
 *
 * @deprecated This class implements a deprecated interface,
 *             {@link org.xml.sax.AttributeList AttributeList};
 *             that interface has been replaced by
 *             {@link org.xml.sax.Attributes Attributes},
 *             which is implemented in the
 *             {@link org.xml.sax.helpers.AttributesImpl
 *            AttributesImpl} helper class.
 * @since 1.4, SAX 1.0
 * @author David Megginson
 * @see org.xml.sax.AttributeList
 * @see org.xml.sax.DocumentHandler#startElement
 */
public class AttributeListImpl implements AttributeList
{

    
Create an empty attribute list.
This constructor is most useful for parser writers, who
will use it to create a single, reusable attribute list that
can be reset with the clear method between elements.
See Also:
addAttribute
clear/**
     * Create an empty attribute list.
     *
     * <p>This constructor is most useful for parser writers, who
     * will use it to create a single, reusable attribute list that
     * can be reset with the clear method between elements.</p>
     *
     * @see #addAttribute
     * @see #clear
     */
    public AttributeListImpl ()
    {
    }


    
Construct a persistent copy of an existing attribute list.
This constructor is most useful for application writers,
who will use it to create a persistent copy of an existing
attribute list.
Params:
atts – The attribute list to copy
See Also:
DocumentHandler.startElement/**
     * Construct a persistent copy of an existing attribute list.
     *
     * <p>This constructor is most useful for application writers,
     * who will use it to create a persistent copy of an existing
     * attribute list.</p>
     *
     * @param atts The attribute list to copy
     * @see org.xml.sax.DocumentHandler#startElement
     */
    public AttributeListImpl (AttributeList atts)
    {
        setAttributeList(atts);
    }



    ////////////////////////////////////////////////////////////////////
    // Methods specific to this class.
    ////////////////////////////////////////////////////////////////////


    
Set the attribute list, discarding previous contents.
This method allows an application writer to reuse an
attribute list easily.
Params:
atts – The attribute list to copy./**
     * Set the attribute list, discarding previous contents.
     *
     * <p>This method allows an application writer to reuse an
     * attribute list easily.</p>
     *
     * @param atts The attribute list to copy.
     */
    public void setAttributeList (AttributeList atts)
    {
        int count = atts.getLength();

        clear();

        for (int i = 0; i < count; i++) {
            addAttribute(atts.getName(i), atts.getType(i), atts.getValue(i));
        }
    }


    
Add an attribute to an attribute list.
This method is provided for SAX parser writers, to allow them
to build up an attribute list incrementally before delivering
it to the application.
Params:
name – The attribute name.
type – The attribute type ("NMTOKEN" for an enumeration).
value – The attribute value (must not be null).
See Also:
removeAttribute
DocumentHandler.startElement/**
     * Add an attribute to an attribute list.
     *
     * <p>This method is provided for SAX parser writers, to allow them
     * to build up an attribute list incrementally before delivering
     * it to the application.</p>
     *
     * @param name The attribute name.
     * @param type The attribute type ("NMTOKEN" for an enumeration).
     * @param value The attribute value (must not be null).
     * @see #removeAttribute
     * @see org.xml.sax.DocumentHandler#startElement
     */
    public void addAttribute (String name, String type, String value)
    {
        names.addElement(name);
        types.addElement(type);
        values.addElement(value);
    }


    
Remove an attribute from the list.
SAX application writers can use this method to filter an
attribute out of an AttributeList.  Note that invoking this
method will change the length of the attribute list and
some of the attribute's indices.
If the requested attribute is not in the list, this is
a no-op.
Params:
name – The attribute name.
See Also:
addAttribute/**
     * Remove an attribute from the list.
     *
     * <p>SAX application writers can use this method to filter an
     * attribute out of an AttributeList.  Note that invoking this
     * method will change the length of the attribute list and
     * some of the attribute's indices.</p>
     *
     * <p>If the requested attribute is not in the list, this is
     * a no-op.</p>
     *
     * @param name The attribute name.
     * @see #addAttribute
     */
    public void removeAttribute (String name)
    {
        int i = names.indexOf(name);

        if (i >= 0) {
            names.removeElementAt(i);
            types.removeElementAt(i);
            values.removeElementAt(i);
        }
    }


    
Clear the attribute list.
SAX parser writers can use this method to reset the attribute
list between DocumentHandler.startElement events.  Normally,
it will make sense to reuse the same AttributeListImpl object
rather than allocating a new one each time.
See Also:
startElement.startElement/**
     * Clear the attribute list.
     *
     * <p>SAX parser writers can use this method to reset the attribute
     * list between DocumentHandler.startElement events.  Normally,
     * it will make sense to reuse the same AttributeListImpl object
     * rather than allocating a new one each time.</p>
     *
     * @see org.xml.sax.DocumentHandler#startElement
     */
    public void clear ()
    {
        names.removeAllElements();
        types.removeAllElements();
        values.removeAllElements();
    }



    ////////////////////////////////////////////////////////////////////
    // Implementation of org.xml.sax.AttributeList
    ////////////////////////////////////////////////////////////////////


    
Return the number of attributes in the list.
See Also:
AttributeList.getLength
Returns:
The number of attributes in the list./**
     * Return the number of attributes in the list.
     *
     * @return The number of attributes in the list.
     * @see org.xml.sax.AttributeList#getLength
     */
    public int getLength ()
    {
        return names.size();
    }


    
Get the name of an attribute (by position).
Params:
i – The position of the attribute in the list.
See Also:
AttributeList.getName(int)
Returns:
The attribute name as a string, or null if there
        is no attribute at that position./**
     * Get the name of an attribute (by position).
     *
     * @param i The position of the attribute in the list.
     * @return The attribute name as a string, or null if there
     *         is no attribute at that position.
     * @see org.xml.sax.AttributeList#getName(int)
     */
    public String getName (int i)
    {
        if (i < 0) {
            return null;
        }
        try {
            return (String)names.elementAt(i);
        } catch (ArrayIndexOutOfBoundsException e) {
            return null;
        }
    }


    
Get the type of an attribute (by position).
Params:
i – The position of the attribute in the list.
See Also:
AttributeList.getType(int)
Returns:
The attribute type as a string ("NMTOKEN" for an
        enumeration, and "CDATA" if no declaration was
        read), or null if there is no attribute at
        that position./**
     * Get the type of an attribute (by position).
     *
     * @param i The position of the attribute in the list.
     * @return The attribute type as a string ("NMTOKEN" for an
     *         enumeration, and "CDATA" if no declaration was
     *         read), or null if there is no attribute at
     *         that position.
     * @see org.xml.sax.AttributeList#getType(int)
     */
    public String getType (int i)
    {
        if (i < 0) {
            return null;
        }
        try {
            return (String)types.elementAt(i);
        } catch (ArrayIndexOutOfBoundsException e) {
            return null;
        }
    }


    
Get the value of an attribute (by position).
Params:
i – The position of the attribute in the list.
See Also:
AttributeList.getValue(int)
Returns:
The attribute value as a string, or null if
        there is no attribute at that position./**
     * Get the value of an attribute (by position).
     *
     * @param i The position of the attribute in the list.
     * @return The attribute value as a string, or null if
     *         there is no attribute at that position.
     * @see org.xml.sax.AttributeList#getValue(int)
     */
    public String getValue (int i)
    {
        if (i < 0) {
            return null;
        }
        try {
            return (String)values.elementAt(i);
        } catch (ArrayIndexOutOfBoundsException e) {
            return null;
        }
    }


    
Get the type of an attribute (by name).
Params:
name – The attribute name.
See Also:
AttributeList.getType(String)
Returns:
The attribute type as a string ("NMTOKEN" for an
        enumeration, and "CDATA" if no declaration was
        read)./**
     * Get the type of an attribute (by name).
     *
     * @param name The attribute name.
     * @return The attribute type as a string ("NMTOKEN" for an
     *         enumeration, and "CDATA" if no declaration was
     *         read).
     * @see org.xml.sax.AttributeList#getType(java.lang.String)
     */
    public String getType (String name)
    {
        return getType(names.indexOf(name));
    }


    
Get the value of an attribute (by name).
Params:
name – The attribute name.
See Also:
AttributeList.getValue(String)/**
     * Get the value of an attribute (by name).
     *
     * @param name The attribute name.
     * @see org.xml.sax.AttributeList#getValue(java.lang.String)
     */
    public String getValue (String name)
    {
        return getValue(names.indexOf(name));
    }



    ////////////////////////////////////////////////////////////////////
    // Internal state.
    ////////////////////////////////////////////////////////////////////

    Vector names = new Vector();
    Vector types = new Vector();
    Vector values = new Vector();

}

// end of AttributeListImpl.java