/*
 * @(#)AbstractListModel.java	1.35 05/11/17
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

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 <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<sup><font size="-2">TM</font></sup>
 * has been added to the <code>java.beans</code> package.
 * Please see {@link java.beans.XMLEncoder}.
 *
 * @version 1.35 11/17/05
 * @author Hans Muller
 */
public abstract class AbstractListModel implements ListModel, Serializable
{
    protected EventListenerList listenerList = new EventListenerList();


    /**
     * 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.
     *
     * @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 <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 (ListDataListener[])listenerList.getListeners(
                ListDataListener.class);
    }


    /**
     * <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);