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App55 client library for the Java platform.
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.googlecode.openbeans;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.LinkedList;
import java.util.List;
public class PropertyChangeSupport implements Serializable
{
private static final long serialVersionUID = 6401253773779951803l;
private transient List globalListeners = new ArrayList();
private Hashtable children = new Hashtable();
private Object source;
@SuppressWarnings("unused")
// for serialization compatibility
private int propertyChangeSupportSerializedDataVersion = 1;
public PropertyChangeSupport(Object sourceBean)
{
if (sourceBean == null)
{
throw new NullPointerException();
}
this.source = sourceBean;
}
public void firePropertyChange(String propertyName, Object oldValue, Object newValue)
{
PropertyChangeEvent event = createPropertyChangeEvent(propertyName, oldValue, newValue);
doFirePropertyChange(event);
}
public void fireIndexedPropertyChange(String propertyName, int index, Object oldValue, Object newValue)
{
// nulls and equals check done in doFire...
doFirePropertyChange(new IndexedPropertyChangeEvent(source, propertyName, oldValue, newValue, index));
}
public synchronized void removePropertyChangeListener(String propertyName, PropertyChangeListener listener)
{
if ((propertyName != null) && (listener != null))
{
PropertyChangeSupport listeners = children.get(propertyName);
if (listeners != null)
{
listeners.removePropertyChangeListener(listener);
}
}
}
public synchronized void addPropertyChangeListener(String propertyName, PropertyChangeListener listener)
{
if ((listener != null) && (propertyName != null))
{
PropertyChangeSupport listeners = children.get(propertyName);
if (listeners == null)
{
listeners = new PropertyChangeSupport(source);
children.put(propertyName, listeners);
}
// RI compatibility
if (listener instanceof PropertyChangeListenerProxy)
{
PropertyChangeListenerProxy proxy = (PropertyChangeListenerProxy) listener;
listeners.addPropertyChangeListener(new PropertyChangeListenerProxy(proxy.getPropertyName(), (PropertyChangeListener) proxy.getListener()));
}
else
{
listeners.addPropertyChangeListener(listener);
}
}
}
public synchronized PropertyChangeListener[] getPropertyChangeListeners(String propertyName)
{
PropertyChangeSupport listeners = null;
if (propertyName != null)
{
listeners = children.get(propertyName);
}
return (listeners == null) ? new PropertyChangeListener[0] : listeners.getPropertyChangeListeners();
}
public void firePropertyChange(String propertyName, boolean oldValue, boolean newValue)
{
PropertyChangeEvent event = createPropertyChangeEvent(propertyName, oldValue, newValue);
doFirePropertyChange(event);
}
public void fireIndexedPropertyChange(String propertyName, int index, boolean oldValue, boolean newValue)
{
if (oldValue != newValue)
{
fireIndexedPropertyChange(propertyName, index, Boolean.valueOf(oldValue), Boolean.valueOf(newValue));
}
}
public void firePropertyChange(String propertyName, int oldValue, int newValue)
{
PropertyChangeEvent event = createPropertyChangeEvent(propertyName, oldValue, newValue);
doFirePropertyChange(event);
}
public void fireIndexedPropertyChange(String propertyName, int index, int oldValue, int newValue)
{
if (oldValue != newValue)
{
fireIndexedPropertyChange(propertyName, index, Integer.valueOf(oldValue), Integer.valueOf(newValue));
}
}
public synchronized boolean hasListeners(String propertyName)
{
if (globalListeners.size() > 0)
{
return true;
}
boolean result = false;
if (propertyName != null)
{
PropertyChangeSupport listeners = children.get(propertyName);
result = (listeners != null && listeners.hasListeners(propertyName));
}
return result;
}
public synchronized void removePropertyChangeListener(PropertyChangeListener listener)
{
if (listener instanceof PropertyChangeListenerProxy)
{
String name = ((PropertyChangeListenerProxy) listener).getPropertyName();
PropertyChangeListener lst = (PropertyChangeListener) ((PropertyChangeListenerProxy) listener).getListener();
removePropertyChangeListener(name, lst);
}
else
{
globalListeners.remove(listener);
}
}
public synchronized void addPropertyChangeListener(PropertyChangeListener listener)
{
if (listener instanceof PropertyChangeListenerProxy)
{
String name = ((PropertyChangeListenerProxy) listener).getPropertyName();
PropertyChangeListener lst = (PropertyChangeListener) ((PropertyChangeListenerProxy) listener).getListener();
addPropertyChangeListener(name, lst);
}
else if (listener != null)
{
globalListeners.add(listener);
}
}
public synchronized PropertyChangeListener[] getPropertyChangeListeners()
{
ArrayList result = new ArrayList(globalListeners);
for (String propertyName : children.keySet())
{
PropertyChangeSupport namedListener = children.get(propertyName);
PropertyChangeListener[] listeners = namedListener.getPropertyChangeListeners();
for (int i = 0; i < listeners.length; i++)
{
result.add(new PropertyChangeListenerProxy(propertyName, listeners[i]));
}
}
return result.toArray(new PropertyChangeListener[0]);
}
private void writeObject(ObjectOutputStream oos) throws IOException
{
oos.defaultWriteObject();
PropertyChangeListener[] gListeners = globalListeners.toArray(new PropertyChangeListener[0]);
for (int i = 0; i < gListeners.length; i++)
{
if (gListeners[i] instanceof Serializable)
{
oos.writeObject(gListeners[i]);
}
}
// Denotes end of list
oos.writeObject(null);
}
private void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException
{
ois.defaultReadObject();
this.globalListeners = new LinkedList();
if (null == this.children)
{
this.children = new Hashtable();
}
Object listener = null;
do
{
// Reads a listener _or_ proxy
listener = ois.readObject();
if (listener != null)
{
addPropertyChangeListener((PropertyChangeListener) listener);
}
}
while (listener != null);
}
public void firePropertyChange(PropertyChangeEvent event)
{
doFirePropertyChange(event);
}
private PropertyChangeEvent createPropertyChangeEvent(String propertyName, Object oldValue, Object newValue)
{
return new PropertyChangeEvent(source, propertyName, oldValue, newValue);
}
@SuppressWarnings("boxing")
private PropertyChangeEvent createPropertyChangeEvent(String propertyName, boolean oldValue, boolean newValue)
{
return new PropertyChangeEvent(source, propertyName, oldValue, newValue);
}
@SuppressWarnings("boxing")
private PropertyChangeEvent createPropertyChangeEvent(String propertyName, int oldValue, int newValue)
{
return new PropertyChangeEvent(source, propertyName, oldValue, newValue);
}
private void doFirePropertyChange(PropertyChangeEvent event)
{
Object oldValue = event.getOldValue();
Object newValue = event.getNewValue();
if (oldValue != null && newValue != null && oldValue.equals(newValue))
{
return;
}
// Collect up the global listeners
PropertyChangeListener[] gListeners;
synchronized (this)
{
gListeners = globalListeners.toArray(new PropertyChangeListener[0]);
}
// Fire the events for global listeners
for (int i = 0; i < gListeners.length; i++)
{
gListeners[i].propertyChange(event);
}
// Fire the events for the property specific listeners if any
if (event.getPropertyName() != null)
{
PropertyChangeSupport namedListener = children.get(event.getPropertyName());
if (namedListener != null)
{
namedListener.firePropertyChange(event);
}
}
}
}