/*
* 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 java.beans;
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.Iterator;
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;
// 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 = (PropertyChangeSupport) children.get(propertyName);
if (listeners != null) {
listeners.removePropertyChangeListener(listener);
}
}
}
public synchronized void addPropertyChangeListener(String propertyName,
PropertyChangeListener listener) {
if ((listener != null) && (propertyName != null)) {
PropertyChangeSupport listeners = (PropertyChangeSupport) 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 = (PropertyChangeSupport) 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,
new Integer(oldValue), new Integer(newValue));
}
}
public synchronized boolean hasListeners(String propertyName) {
if(globalListeners.size() > 0){
return true;
}
boolean result = false;
if (propertyName != null) {
PropertyChangeSupport listeners = (PropertyChangeSupport) 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);
Iterator propertyNameIterator = children.keySet().iterator();
while (propertyNameIterator.hasNext()) {
final String propertyName = (String) propertyNameIterator.next();
PropertyChangeSupport namedListener = (PropertyChangeSupport) children
.get(propertyName);
PropertyChangeListener[] listeners = namedListener
.getPropertyChangeListeners();
for (int i = 0; i < listeners.length; i++) {
result.add(new PropertyChangeListenerProxy(propertyName,
listeners[i]));
}
}
return (PropertyChangeListener[]) result.toArray(new PropertyChangeListener[0]);
}
private void writeObject(ObjectOutputStream oos) throws IOException {
oos.defaultWriteObject();
PropertyChangeListener[] gListeners = (PropertyChangeListener[]) 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);
}
private PropertyChangeEvent createPropertyChangeEvent(String propertyName,
boolean oldValue, boolean newValue) {
return new PropertyChangeEvent(source, propertyName, Boolean.valueOf(oldValue), Boolean.valueOf(newValue));
}
private PropertyChangeEvent createPropertyChangeEvent(String propertyName,
int oldValue, int newValue) {
return new PropertyChangeEvent(source, propertyName, new Integer(oldValue), new Integer(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 = (PropertyChangeListener[]) 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 = (PropertyChangeSupport) children
.get(event.getPropertyName());
if (namedListener != null) {
namedListener.firePropertyChange(event);
}
}
}
}