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/*****************************************************************************
* Copyright (c) 2013, 2014 CEA LIST and others.
*
* 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:
* CEA LIST - Initial API and implementation
* Christian W. Damus (CEA) - bug 402525
*****************************************************************************/
package org.eclipse.papyrus.cdo.core.resource;
import java.util.Set;
import org.eclipse.core.commands.operations.IOperationHistory;
import org.eclipse.core.commands.operations.IUndoableOperation;
import org.eclipse.emf.cdo.eresource.EresourcePackage;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.transaction.ResourceSetChangeEvent;
import org.eclipse.papyrus.commands.NestingNotifyingWorkspaceCommandStack;
import com.google.common.collect.Sets;
/**
* A CDO-specific command-stack that attaches undo contexts describing object-level
* details of the scope of a change.
*/
public class CDOAwareCommandStack extends NestingNotifyingWorkspaceCommandStack {
public CDOAwareCommandStack(IOperationHistory history) {
super(history);
}
protected CDOAwareCommandStack(boolean nested, IOperationHistory history) {
super(nested, history);
}
@Override
protected NestingNotifyingWorkspaceCommandStack createNestedCommandStack(IOperationHistory history) {
return new CDOAwareCommandStack(true, history);
}
@Override
protected void hookUndoContexts(IUndoableOperation operation, ResourceSetChangeEvent event) {
super.hookUndoContexts(operation, event);
Set<EObject> affectedObjects = Sets.newHashSet();
for(Notification next : event.getNotifications()) {
Object notifier = next.getNotifier();
// don't exclude CDOResources, which are EObjects as well as Resources, unless the change
// is in some other property than the contents
if(notifier instanceof EObject) {
EObject object = (EObject)notifier;
if(object.eClass() != EresourcePackage.Literals.CDO_RESOURCE) {
affectedObjects.add(object);
} else if(next.getFeature() == EresourcePackage.Literals.CDO_RESOURCE__CONTENTS) {
affectedObjects.add(object);
}
}
}
if(!affectedObjects.isEmpty()) {
operation.addContext(new CDOUndoContext(affectedObjects));
}
}
}
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