/*
* 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.List;
// FIXME: obviously need synchronization, when access listeners
public class VetoableChangeSupport implements Serializable {
private static final long serialVersionUID = -5090210921595982017l;
private Hashtable children = new Hashtable();
private transient ArrayList globalListeners = new ArrayList();
private Object source;
// for serialization
private int vetoableChangeSupportSerializedDataVersion = 2;
public VetoableChangeSupport(Object sourceBean) {
if (sourceBean == null) {
throw new NullPointerException();
}
this.source = sourceBean;
}
public synchronized void removeVetoableChangeListener(String propertyName,
VetoableChangeListener listener) {
if ((propertyName != null) && (listener != null)) {
VetoableChangeSupport listeners = (VetoableChangeSupport) children.get(propertyName);
if (listeners != null) {
listeners.removeVetoableChangeListener(listener);
}
}
}
public synchronized void addVetoableChangeListener(String propertyName,
VetoableChangeListener listener) {
if (propertyName != null && listener != null) {
VetoableChangeSupport listeners = (VetoableChangeSupport) children.get(propertyName);
if (listeners == null) {
listeners = new VetoableChangeSupport(source);
children.put(propertyName, listeners);
}
listeners.addVetoableChangeListener(listener);
}
}
public synchronized VetoableChangeListener[] getVetoableChangeListeners(
String propertyName) {
VetoableChangeSupport listeners = null;
if (propertyName != null) {
listeners = (VetoableChangeSupport) children.get(propertyName);
}
return (listeners == null) ? new VetoableChangeListener[] {}
: getAsVetoableChangeListenerArray(listeners);
}
public synchronized boolean hasListeners(String propertyName) {
boolean result = globalListeners.size() > 0;
if (!result && propertyName != null) {
VetoableChangeSupport listeners = (VetoableChangeSupport) children.get(propertyName);
if (listeners != null) {
result = listeners.globalListeners.size() > 0;
}
}
return result;
}
public synchronized void removeVetoableChangeListener(
VetoableChangeListener listener) {
if (listener != null) {
globalListeners.remove(listener);
}
}
public synchronized void addVetoableChangeListener(
VetoableChangeListener listener) {
if (listener != null) {
if (listener instanceof VetoableChangeListenerProxy) {
VetoableChangeListenerProxy proxy = (VetoableChangeListenerProxy) listener;
addVetoableChangeListener(proxy.getPropertyName(),
(VetoableChangeListener) proxy.getListener());
} else {
globalListeners.add(listener);
}
}
}
public synchronized VetoableChangeListener[] getVetoableChangeListeners() {
List result = new ArrayList();
if (globalListeners != null) {
result.addAll(globalListeners);
}
for (Iterator iterator = children.keySet().iterator(); iterator
.hasNext();) {
String propertyName = (String) iterator.next();
VetoableChangeSupport namedListener = (VetoableChangeSupport) children
.get(propertyName);
VetoableChangeListener[] childListeners = namedListener
.getVetoableChangeListeners();
for (int i = 0; i < childListeners.length; i++) {
result.add(new VetoableChangeListenerProxy(propertyName,
childListeners[i]));
}
}
return (VetoableChangeListener[]) result
.toArray(new VetoableChangeListener[result.size()]);
}
private void writeObject(ObjectOutputStream oos) throws IOException {
oos.defaultWriteObject();
VetoableChangeListener[] copy = new VetoableChangeListener[globalListeners
.size()];
globalListeners.toArray(copy);
for (int i = 0; i < copy.length; ++i) {
VetoableChangeListener listener = copy[i];
if (listener instanceof Serializable) {
oos.writeObject(listener);
}
}
// Denotes end of list
oos.writeObject(null);
}
private void readObject(ObjectInputStream ois) throws IOException,
ClassNotFoundException {
ois.defaultReadObject();
this.globalListeners = new ArrayList();
if (null == this.children) {
this.children = new Hashtable();
}
Object listener;
do {
// Reads a listener _or_ proxy
listener = ois.readObject();
addVetoableChangeListener((VetoableChangeListener) listener);
} while (listener != null);
}
public void fireVetoableChange(String propertyName, boolean oldValue,
boolean newValue) throws PropertyVetoException {
PropertyChangeEvent event = createPropertyChangeEvent(propertyName,
Boolean.valueOf(oldValue), Boolean.valueOf(newValue));
doFirePropertyChange(event);
}
public void fireVetoableChange(String propertyName, int oldValue,
int newValue) throws PropertyVetoException {
PropertyChangeEvent event = createPropertyChangeEvent(propertyName,
new Integer(oldValue), new Integer(newValue));
doFirePropertyChange(event);
}
public void fireVetoableChange(String propertyName, Object oldValue,
Object newValue) throws PropertyVetoException {
PropertyChangeEvent event = createPropertyChangeEvent(propertyName,
oldValue, newValue);
doFirePropertyChange(event);
}
public void fireVetoableChange(PropertyChangeEvent event)
throws PropertyVetoException {
doFirePropertyChange(event);
}
private PropertyChangeEvent createPropertyChangeEvent(String propertyName,
Object oldValue, Object newValue) {
return new PropertyChangeEvent(source, propertyName, oldValue, newValue);
}
private void doFirePropertyChange(PropertyChangeEvent event)
throws PropertyVetoException {
String propName = event.getPropertyName();
Object oldValue = event.getOldValue();
Object newValue = event.getNewValue();
if (newValue != null && oldValue != null && newValue.equals(oldValue)) {
return;
}
/* Take note of who we are going to notify (and potentially un-notify) */
VetoableChangeListener[] listensToAll;
VetoableChangeSupport listeners = null;
// property change
synchronized (this) {
listensToAll = (VetoableChangeListener[]) globalListeners
.toArray(new VetoableChangeListener[0]);
String propertyName = event.getPropertyName();
if (propertyName != null) {
listeners = (VetoableChangeSupport) children.get(propertyName);
}
}
try {
for (int i = 0; i < listensToAll.length; ++i) {
VetoableChangeListener listener = listensToAll[i];
listener.vetoableChange(event);
}
} catch (PropertyVetoException pve) {
// Tell them we have changed it back
PropertyChangeEvent revertEvent = createPropertyChangeEvent(
propName, newValue, oldValue);
for (int i = 0; i < listensToAll.length; ++i) {
VetoableChangeListener listener = listensToAll[i];
try {
listener.vetoableChange(revertEvent);
} catch (PropertyVetoException ignored) {
// expected
}
}
throw pve;
}
if (listeners != null) {
listeners.fireVetoableChange(event);
}
}
private static VetoableChangeListener[] getAsVetoableChangeListenerArray(
VetoableChangeSupport listeners) {
return (VetoableChangeListener[]) listeners.globalListeners.toArray(new VetoableChangeListener[0]);
}
}