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/*******************************************************************************
* Copyright (c) 2007, 2010 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.common.utility.internal.model.listener.awt;
import java.awt.EventQueue;
import org.eclipse.jpt.common.utility.model.event.TreeAddEvent;
import org.eclipse.jpt.common.utility.model.event.TreeChangeEvent;
import org.eclipse.jpt.common.utility.model.event.TreeClearEvent;
import org.eclipse.jpt.common.utility.model.event.TreeRemoveEvent;
import org.eclipse.jpt.common.utility.model.listener.TreeChangeListener;
/**
* Wrap another tree change listener and forward events to it on the AWT
* event queue, asynchronously if necessary. If the event arrived on the UI
* thread that is probably because it was initiated by a UI widget; as a
* result, we want to loop back synchronously so the events can be
* short-circuited.
*/
public final class AWTTreeChangeListenerWrapper
implements TreeChangeListener
{
private final TreeChangeListener listener;
public AWTTreeChangeListenerWrapper(TreeChangeListener listener) {
super();
if (listener == null) {
throw new NullPointerException();
}
this.listener = listener;
}
public void nodeAdded(TreeAddEvent event) {
if (this.isExecutingOnUIThread()) {
this.nodeAdded_(event);
} else {
this.executeOnEventQueue(this.buildNodeAddedRunnable(event));
}
}
public void nodeRemoved(TreeRemoveEvent event) {
if (this.isExecutingOnUIThread()) {
this.nodeRemoved_(event);
} else {
this.executeOnEventQueue(this.buildNodeRemovedRunnable(event));
}
}
public void treeCleared(TreeClearEvent event) {
if (this.isExecutingOnUIThread()) {
this.treeCleared_(event);
} else {
this.executeOnEventQueue(this.buildTreeClearedRunnable(event));
}
}
public void treeChanged(TreeChangeEvent event) {
if (this.isExecutingOnUIThread()) {
this.treeChanged_(event);
} else {
this.executeOnEventQueue(this.buildTreeChangedRunnable(event));
}
}
private Runnable buildNodeAddedRunnable(final TreeAddEvent event) {
return new Runnable() {
public void run() {
AWTTreeChangeListenerWrapper.this.nodeAdded_(event);
}
@Override
public String toString() {
return "node added runnable"; //$NON-NLS-1$
}
};
}
private Runnable buildNodeRemovedRunnable(final TreeRemoveEvent event) {
return new Runnable() {
public void run() {
AWTTreeChangeListenerWrapper.this.nodeRemoved_(event);
}
@Override
public String toString() {
return "node removed runnable"; //$NON-NLS-1$
}
};
}
private Runnable buildTreeClearedRunnable(final TreeClearEvent event) {
return new Runnable() {
public void run() {
AWTTreeChangeListenerWrapper.this.treeCleared_(event);
}
@Override
public String toString() {
return "tree cleared runnable"; //$NON-NLS-1$
}
};
}
private Runnable buildTreeChangedRunnable(final TreeChangeEvent event) {
return new Runnable() {
public void run() {
AWTTreeChangeListenerWrapper.this.treeChanged_(event);
}
@Override
public String toString() {
return "tree changed runnable"; //$NON-NLS-1$
}
};
}
private boolean isExecutingOnUIThread() {
return EventQueue.isDispatchThread();
}
/**
* {@link EventQueue#invokeLater(Runnable)} seems to work OK;
* but using {@link EventQueue#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 nodeAdded_(TreeAddEvent event) {
this.listener.nodeAdded(event);
}
void nodeRemoved_(TreeRemoveEvent event) {
this.listener.nodeRemoved(event);
}
void treeCleared_(TreeClearEvent event) {
this.listener.treeCleared(event);
}
void treeChanged_(TreeChangeEvent event) {
this.listener.treeChanged(event);
}
@Override
public String toString() {
return "AWT(" + this.listener.toString() + ')'; //$NON-NLS-1$
}
}
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