| /* 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 |