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/*
* Sun Public License Notice
*
* The contents of this file are subject to the Sun Public License
* Version 1.0 (the "License"). You may not use this file except in
* compliance with the License. A copy of the License is available at
* http://www.sun.com/
*
* The Original Code is NetBeans. The Initial Developer of the Original
* Code is Sun Microsystems, Inc. Portions Copyright 1997-2002 Sun
* Microsystems, Inc. All Rights Reserved.
*/
package org.netbeans.modules.xml.tax.beans;
import java.beans.*;
import java.util.*;
import org.netbeans.tax.*;
/**
* This class listens on all members of object list and
* joins all member events into this one source.
*
* * TreeObjectListProxyListener proxy =
* new TreeObjectListProxyListener(list);
* proxy.addPropertyChangeListener(WeakListener.propertyChange(this, proxy));
*
*
* @author Petr Kuzel
* @version 1.0
*/
public class TreeObjectListProxyListener implements PropertyChangeListener {
private final TreeObjectList list;
private PropertyChangeSupport changeSupport;
/** Creates new TreeObjectListListener */
public TreeObjectListProxyListener(TreeObjectList list) {
this.list = list;
list.addPropertyChangeListener(this);
for (Iterator it = list.iterator(); it.hasNext();) {
TreeObject next = (TreeObject) it.next();
if (next != null) next.addPropertyChangeListener(this);
}
}
/*
* Update listening on list members, forward member events.
*/
public void propertyChange(final PropertyChangeEvent e) {
String name = e.getPropertyName();
Object source = e.getSource();
if (source == list) {
if (TreeObjectList.PROP_CONTENT_INSERT.equals(name)) {
TreeObject newObject = (TreeObject)e.getNewValue();
if (newObject != null) newObject.addPropertyChangeListener(this);
} else if (TreeObjectList.PROP_CONTENT_REMOVE.equals(name)) {
TreeObject oldObject = (TreeObject)e.getOldValue();
if (oldObject != null) oldObject.removePropertyChangeListener(this);
}
}
forward(e);
}
/**
*/
private void forward(final PropertyChangeEvent e) {
if (changeSupport != null)
changeSupport.firePropertyChange(e);
}
public void addPropertyChangeListener(PropertyChangeListener l) {
synchronized (this) {
if (changeSupport == null)
changeSupport = new PropertyChangeSupport(this);
}
changeSupport.addPropertyChangeListener(l);
}
public void removePropertyChangeListener(PropertyChangeListener l) {
if (changeSupport != null)
changeSupport.removePropertyChangeListener(l);
}
}
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