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/* * @(#)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); } } } /** * <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); } } } /** * <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 * <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 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); } }