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/*******************************************************************************
* Copyright (c) 2009 itemis AG (http://www.itemis.eu) 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
*******************************************************************************/
package org.eclipse.papyrus.infra.gmfdiag.xtext.glue.editingdomain;
import org.eclipse.emf.common.command.Command;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.transaction.NotificationFilter;
import org.eclipse.emf.transaction.ResourceSetChangeEvent;
import org.eclipse.emf.transaction.ResourceSetListener;
import org.eclipse.emf.transaction.RollbackException;
import org.eclipse.gef.EditPart;
import org.eclipse.gmf.runtime.diagram.ui.editparts.DiagramEditPart;
import org.eclipse.xtext.resource.XtextResource;
/**
* Reloads the semantic root element (the element of the diagram) on changes and refreshes the diagram. GMF does by
* default not listen to such events which can occur in an {@link XtextResource}, if the document changes close to the
* root element.
*
* Activate an instance of this in the {@link EditPart#activate()} method of the {@link DiagramEditPart}.
*
* @author koehnlein
*/
public class SemanticRootUnloadListener implements ResourceSetListener {
private DiagramEditPart rootEditPart;
private EObject semanticRootElement;
/**
* This element comes from the XText/GMF integration example, and was not originally documented.
* @param rootEditPart
*
*/
public SemanticRootUnloadListener(DiagramEditPart rootEditPart) {
this.rootEditPart = rootEditPart;
this.semanticRootElement = rootEditPart.resolveSemanticElement();
}
/**
* This element comes from the XText/GMF integration example, and was not originally documented.
*/
public void activate() {
rootEditPart.getEditingDomain().addResourceSetListener(this);
}
/**
* This element comes from the XText/GMF integration example, and was not originally documented.
*/
public void deactivate() {
rootEditPart.getEditingDomain().removeResourceSetListener(this);
}
public NotificationFilter getFilter() {
return new NotificationFilter.Custom() {
@Override
public boolean matches(Notification notification) {
int featureID = notification.getFeatureID(Resource.class);
Object notifier = notification.getNotifier();
int eventType = notification.getEventType();
return notification.getOldValue() == semanticRootElement && featureID == Resource.RESOURCE__CONTENTS
&& (eventType == Notification.REMOVE || eventType == Notification.SET)
&& notifier instanceof Resource;
}
};
}
public boolean isAggregatePrecommitListener() {
return false;
}
public boolean isPostcommitOnly() {
return true;
}
public boolean isPrecommitOnly() {
return false;
}
public void resourceSetChanged(ResourceSetChangeEvent event) {
semanticRootElement = rootEditPart.resolveSemanticElement();
rootEditPart.refresh();
}
public Command transactionAboutToCommit(ResourceSetChangeEvent event) throws RollbackException {
return null;
}
}
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