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/*******************************************************************************
* Copyright (c) 2007, 2008 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0, which accompanies this distribution
* and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.utility.internal.model.listener.awt;
import java.awt.EventQueue;
import org.eclipse.jpt.utility.model.event.PropertyChangeEvent;
import org.eclipse.jpt.utility.model.listener.PropertyChangeListener;
/**
* Wrap another property change listener and forward events to it on the AWT
* event queue.
* Forward *every* event asynchronously via the UI thread so the listener
* receives in the same order they were generated.
*/
public class AWTPropertyChangeListenerWrapper
implements PropertyChangeListener
{
private final PropertyChangeListener listener;
public AWTPropertyChangeListenerWrapper(PropertyChangeListener listener) {
super();
if (listener == null) {
throw new NullPointerException();
}
this.listener = listener;
}
public void propertyChanged(PropertyChangeEvent event) {
this.executeOnEventQueue(this.buildRunnable(event));
}
private Runnable buildRunnable(final PropertyChangeEvent event) {
return new Runnable() {
public void run() {
AWTPropertyChangeListenerWrapper.this.propertyChanged_(event);
}
};
}
/**
* EventQueue#invokeLater(Runnable) seems to work OK;
* but using #invokeAndWait(Runnable) can sometimes make things
* more predictable when debugging, at the risk of deadlocks.
*/
private void executeOnEventQueue(Runnable r) {
EventQueue.invokeLater(r);
// try {
// EventQueue.invokeAndWait(r);
// } catch (InterruptedException ex) {
// throw new RuntimeException(ex);
// } catch (java.lang.reflect.InvocationTargetException ex) {
// throw new RuntimeException(ex);
// }
}
void propertyChanged_(PropertyChangeEvent event) {
this.listener.propertyChanged(event);
}
@Override
public String toString() {
return "AWT(" + this.listener.toString() + ")";
}
}
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