/* SwingPropertyChangeSupport.java -- Copyright (C) 2002, 2004 Free Software Foundation, Inc. This file is part of GNU Classpath. GNU Classpath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU Classpath 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 for more details. You should have received a copy of the GNU General Public License along with GNU Classpath; see the file COPYING. If not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version. */ package javax.swing.event; import java.beans.PropertyChangeEvent; import java.beans.PropertyChangeListener; import java.beans.PropertyChangeSupport; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.util.EventListener; import java.util.Hashtable; /** * SwingPropertyChangeSupport * @author Andrew Selkirk */ public final class SwingPropertyChangeSupport extends PropertyChangeSupport { private static final long serialVersionUID = 7162625831330845068L; //------------------------------------------------------------- // Variables -------------------------------------------------- //------------------------------------------------------------- /** * listeners */ private transient EventListenerList listeners; /** * propertyListeners */ private Hashtable propertyListeners; /** * source */ private Object source; //------------------------------------------------------------- // Initialization --------------------------------------------- //------------------------------------------------------------- /** * Constructor SwingPropertyChangeSupport * @param source TODO */ public SwingPropertyChangeSupport(Object source) { super(source); this.source = source; this.listeners = new EventListenerList(); this.propertyListeners = new Hashtable(); } // SwingPropertyChangeSupport() //------------------------------------------------------------- // Methods ---------------------------------------------------- //------------------------------------------------------------- /** * writeObject * @param stream TODO * @exception IOException TODO */ private void writeObject(ObjectOutputStream stream) throws IOException { // TODO } // writeObject() /** * readObject * @param stream TODO * @exception ClassNotFoundException TODO * @exception IOException TODO */ private void readObject(ObjectInputStream stream) throws ClassNotFoundException, IOException { // TODO } // readObject() /** * addPropertyChangeListener * @param listener TODO */ public synchronized void addPropertyChangeListener(PropertyChangeListener listener) { listeners.add(PropertyChangeListener.class, listener); } // addPropertyChangeListener() /** * addPropertyChangeListener * @param propertyName TODO * @param listener TODO */ public synchronized void addPropertyChangeListener(String propertyName, PropertyChangeListener listener) { // Variables EventListenerList list; // Get Listener list list = (EventListenerList) propertyListeners.get(propertyName); if (list == null) { list = new EventListenerList(); propertyListeners.put(propertyName, list); } // if // Add Listeners list.add(PropertyChangeListener.class, listener); } // addPropertyChangeListener() /** * removePropertyChangeListener * @param listener TODO */ public synchronized void removePropertyChangeListener(PropertyChangeListener listener) { listeners.remove(PropertyChangeListener.class, listener); } // removePropertyChangeListener() /** * removePropertyChangeListener * @param propertyName TODO * @param listener TODO */ public synchronized void removePropertyChangeListener(String propertyName, PropertyChangeListener listener) { // Variables EventListenerList list; // Get Listener list list = (EventListenerList) propertyListeners.get(propertyName); if (list == null) { return; } // if // Remove Listeners list.remove(PropertyChangeListener.class, listener); // Clean up propertyListeners if (list.getListenerCount() == 0) { propertyListeners.remove(propertyName); } // if } // removePropertyChangeListener() /** * firePropertyChange * @param propertyName TODO * @param oldValue TODO * @param newValue TODO */ public void firePropertyChange(String propertyName, Object oldValue, Object newValue) { // Variables PropertyChangeEvent event; // Create Property Change Event event = new PropertyChangeEvent(source, propertyName, oldValue, newValue); // Fire Event firePropertyChange(event); } // firePropertyChange() /** * firePropertyChange * @param event TODO */ public void firePropertyChange(PropertyChangeEvent event) { // Variables EventListenerList list; EventListener[] listenerList; int index; PropertyChangeListener listener; // Check Values if they are equal if (event.getOldValue() == null && event.getNewValue() == null || (event.getOldValue() != null && event.getNewValue() != null && event.getOldValue().equals(event.getNewValue()))) { return; } // if // Process Main Listener List listenerList = listeners.getListeners(PropertyChangeListener.class); for (index = 0; index < listenerList.length; index++) { listener = (PropertyChangeListener) listenerList[index]; listener.propertyChange(event); } // for // Process Property Listener List list = (EventListenerList) propertyListeners.get(event.getPropertyName()); if (list != null) { listenerList = list.getListeners(PropertyChangeListener.class); for (index = 0; index < listenerList.length; index++) { listener = (PropertyChangeListener) listenerList[index]; listener.propertyChange(event); } // for } // if } // firePropertyChange() /** * hasListeners * @param propertyName TODO * @returns boolean */ public synchronized boolean hasListeners(String propertyName) { // Get Listener list if (propertyListeners.get(propertyName) == null) { return false; } // if return true; } // hasListeners() } // SwingPropertyChangeSupport