/*
* 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.beancontext;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.beans.PropertyVetoException;
import java.beans.VetoableChangeListener;
import java.beans.VetoableChangeSupport;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import org.apache.harmony.beans.internal.nls.Messages;
public class BeanContextChildSupport implements BeanContextChild,
BeanContextServicesListener, Serializable {
private static final long serialVersionUID = 6328947014421475877L;
static final String BEAN_CONTEXT = "beanContext"; //$NON-NLS-1$
protected transient BeanContext beanContext;
public BeanContextChild beanContextChildPeer;
protected PropertyChangeSupport pcSupport;
protected transient boolean rejectedSetBCOnce;
protected VetoableChangeSupport vcSupport;
public BeanContextChildSupport() {
// This class implements the JavaBean component itself
this(null);
}
public BeanContextChildSupport(BeanContextChild bcc) {
// If 'bcc' parameter is not null the JavaBean component itself
// implements BeanContextChild
this.beanContextChildPeer = (bcc == null ? this : bcc);
// Initialize necessary fields for later use
pcSupport = new PropertyChangeSupport(this.beanContextChildPeer);
vcSupport = new VetoableChangeSupport(this.beanContextChildPeer);
this.rejectedSetBCOnce = false;
}
public void addPropertyChangeListener(String name,
PropertyChangeListener pcl) {
// Do nothing if name or listener is null
if ((name == null) || (pcl == null)) {
return;
}
this.pcSupport.addPropertyChangeListener(name, pcl);
}
public void addVetoableChangeListener(String name,
VetoableChangeListener vcl) {
// Do nothing if name or listener is null
if ((name == null) || (vcl == null)) {
return;
}
this.vcSupport.addVetoableChangeListener(name, vcl);
}
public void firePropertyChange(String name, Object oldValue, Object newValue) {
this.pcSupport.firePropertyChange(name, oldValue, newValue);
}
public void fireVetoableChange(String name, Object oldValue, Object newValue)
throws PropertyVetoException {
this.vcSupport.fireVetoableChange(name, oldValue, newValue);
}
public synchronized BeanContext getBeanContext() {
return this.beanContext;
}
public BeanContextChild getBeanContextChildPeer() {
return this.beanContextChildPeer;
}
protected void initializeBeanContextResources() {
}
public boolean isDelegated() {
return (!this.beanContextChildPeer.equals(this));
}
private void readObject(ObjectInputStream ois) throws IOException,
ClassNotFoundException {
ois.defaultReadObject();
}
protected void releaseBeanContextResources() {
}
public void removePropertyChangeListener(String name,
PropertyChangeListener pcl) {
this.pcSupport.removePropertyChangeListener(name, pcl);
}
public void removeVetoableChangeListener(String name,
VetoableChangeListener vcl) {
this.vcSupport.removeVetoableChangeListener(name, vcl);
}
public void serviceAvailable(BeanContextServiceAvailableEvent bcsae) {
if (isDelegated()) {
((BeanContextServicesListener) beanContextChildPeer)
.serviceAvailable(bcsae);
}
}
public void serviceRevoked(BeanContextServiceRevokedEvent bcsre) {
if (isDelegated()) {
((BeanContextServicesListener) beanContextChildPeer)
.serviceRevoked(bcsre);
}
}
public synchronized void setBeanContext(BeanContext bc)
throws PropertyVetoException {
// Do nothing if the old and new values are equal
if ((this.beanContext == null) && (bc == null)) {
return;
}
if ((this.beanContext != null) && this.beanContext.equals(bc)) {
return;
}
releaseBeanContextResources();
// Children are not allowed to repeatedly veto this operation.
// So, we set rejectedSetBCOnce flag to true if veto occurs
// and never veto the change again
if (!this.rejectedSetBCOnce) {
// Validate the new BeanContext value and throw
// PropertyVetoException if it was not successful
if (!validatePendingSetBeanContext(bc)) {
this.rejectedSetBCOnce = true;
fireVetoableChange(BEAN_CONTEXT, this.beanContext, bc);
throw new PropertyVetoException(Messages.getString("beans.0F"), //$NON-NLS-1$
new PropertyChangeEvent(this.beanContextChildPeer,
BEAN_CONTEXT, this.beanContext, bc));
}
this.rejectedSetBCOnce = false;
// We have to notify all listeners about "beanContext"
// property change
firePropertyChange(BEAN_CONTEXT, this.beanContext, bc);
this.beanContext = bc;
initializeBeanContextResources();
}
}
public boolean validatePendingSetBeanContext(BeanContext newValue) {
return true;
}
private void writeObject(ObjectOutputStream oos) throws IOException {
oos.defaultWriteObject();
}
}