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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.ui.internal.listeners;
import org.eclipse.jpt.utility.model.event.CollectionChangeEvent;
import org.eclipse.jpt.utility.model.listener.CollectionChangeListener;
import org.eclipse.swt.widgets.Display;
/**
* Wrap another collection change listener and forward events to it on the SWT
* UI thread.
*/
public class SWTCollectionChangeListenerWrapper
implements CollectionChangeListener
{
private final CollectionChangeListener listener;
public SWTCollectionChangeListenerWrapper(CollectionChangeListener listener) {
super();
if (listener == null) {
throw new NullPointerException();
}
this.listener = listener;
}
public void itemsAdded(CollectionChangeEvent event) {
if (this.isExecutingUIThread()) {
this.itemsAdded_(event);
} else {
this.executeOnUIThread(this.buildItemsAddedRunnable(event));
}
}
public void itemsRemoved(CollectionChangeEvent event) {
if (this.isExecutingUIThread()) {
this.itemsRemoved_(event);
} else {
this.executeOnUIThread(this.buildItemsRemovedRunnable(event));
}
}
public void collectionCleared(CollectionChangeEvent event) {
if (this.isExecutingUIThread()) {
this.collectionCleared_(event);
} else {
this.executeOnUIThread(this.buildCollectionClearedRunnable(event));
}
}
public void collectionChanged(CollectionChangeEvent event) {
if (this.isExecutingUIThread()) {
this.collectionChanged_(event);
} else {
this.executeOnUIThread(this.buildCollectionChangedRunnable(event));
}
}
private Runnable buildItemsAddedRunnable(final CollectionChangeEvent event) {
return new Runnable() {
public void run() {
SWTCollectionChangeListenerWrapper.this.itemsAdded_(event);
}
@Override
public String toString() {
return "items added";
}
};
}
private Runnable buildItemsRemovedRunnable(final CollectionChangeEvent event) {
return new Runnable() {
public void run() {
SWTCollectionChangeListenerWrapper.this.itemsRemoved_(event);
}
@Override
public String toString() {
return "items removed";
}
};
}
private Runnable buildCollectionClearedRunnable(final CollectionChangeEvent event) {
return new Runnable() {
public void run() {
SWTCollectionChangeListenerWrapper.this.collectionCleared_(event);
}
@Override
public String toString() {
return "collection cleared";
}
};
}
private Runnable buildCollectionChangedRunnable(final CollectionChangeEvent event) {
return new Runnable() {
public void run() {
SWTCollectionChangeListenerWrapper.this.collectionChanged_(event);
}
@Override
public String toString() {
return "collection changed";
}
};
}
private boolean isExecutingUIThread() {
return Display.getCurrent() != null;
}
/**
* Display#asyncExec(Runnable) seems to work OK;
* but using #syncExec(Runnable) can somtimes make things
* more predictable when debugging, at the risk of deadlocks.
*/
private void executeOnUIThread(Runnable r) {
Display.getDefault().asyncExec(r);
// Display.getDefault().syncExec(r);
}
void itemsAdded_(CollectionChangeEvent event) {
this.listener.itemsAdded(event);
}
void itemsRemoved_(CollectionChangeEvent event) {
this.listener.itemsRemoved(event);
}
void collectionCleared_(CollectionChangeEvent event) {
this.listener.collectionCleared(event);
}
void collectionChanged_(CollectionChangeEvent event) {
this.listener.collectionChanged(event);
}
@Override
public String toString() {
return "SWT(" + this.listener.toString() + ")";
}
}
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