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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 java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.util.EContentAdapter;
import org.eclipse.xtext.resource.XtextResource;
import com.google.common.collect.Lists;
/**
* @author Knut Wannheden - Initial contribution and API
* @author Jan Koehnlein
*/
public class ChangeAggregatorAdapter extends EContentAdapter {
private Collection<EObject> modifiedObjects = new LinkedHashSet<EObject>();
private boolean isRecording = false;
private boolean isSuspended = false;
@Override
public void notifyChanged(Notification notification) {
super.notifyChanged(notification);
if (!doRecord(notification))
return;
if (notification.getNotifier() instanceof EObject) {
recordObjectModification((EObject) notification.getNotifier());
}
}
protected void recordObjectModification(EObject obj) {
if (obj.eResource() == null || false == obj.eResource() instanceof XtextResource)
modifiedObjects.remove(obj);
else
modifiedObjects.add(obj);
}
protected boolean doRecord(Notification notification) {
if (!isRecording || isSuspended || notification.isTouch())
return false;
switch (notification.getEventType()) {
case Notification.ADD:
case Notification.ADD_MANY:
case Notification.MOVE:
case Notification.REMOVE:
case Notification.REMOVE_MANY:
case Notification.SET:
case Notification.UNSET:
return true;
default:
return false;
}
}
private void reset() {
modifiedObjects.clear();
}
/**
* This element comes from the XText/GMF integration example, and was not originally documented.
*/
public void beginRecording() {
reset();
isRecording = true;
}
/**
* This element comes from the XText/GMF integration example, and was not originally documented.
*/
public void endRecording() {
isRecording = false;
}
/**
* This element comes from the XText/GMF integration example, and was not originally documented.
* @param isSuspended
*/
public void setSuspended(boolean isSuspended) {
this.isSuspended = isSuspended;
}
/**
* This element comes from the XText/GMF integration example, and was not originally documented.
* @return List<EOject>
*/
public List<EObject> getModificationRoots() {
Map<Resource, List<EObject>> resource2ChangePathMap = new HashMap<Resource, List<EObject>>();
for (EObject eObject : modifiedObjects) {
if (!eObject.eIsProxy()) {
Resource resource = eObject.eResource();
List<EObject> resourceChangePath = resource2ChangePathMap.get(resource);
if (resourceChangePath == null) {
resourceChangePath = allContainers(eObject);
resource2ChangePathMap.put(resource, resourceChangePath);
} else {
resourceChangePath.retainAll(allContainers(eObject));
}
}
}
List<EObject> modificationRoots = new ArrayList<EObject>(resource2ChangePathMap.size());
for (List<EObject> changePath : resource2ChangePathMap.values()) {
if (!changePath.isEmpty()) {
modificationRoots.add(changePath.get(changePath.size() - 1));
}
}
return modificationRoots;
}
private LinkedList<EObject> allContainers(EObject eObject) {
final LinkedList<EObject> allContainers = Lists.newLinkedList();
allContainers.add(eObject);
EObject currentContainer = eObject.eContainer();
final Resource resource = eObject.eResource();
while (currentContainer != null && resource == currentContainer.eResource()) {
allContainers.addFirst(currentContainer);
currentContainer = currentContainer.eContainer();
}
return allContainers;
}
/**
* Only attach to XtextResources
*/
@Override
protected void setTarget(Resource target) {
if (target instanceof XtextResource) {
super.setTarget(target);
}
}
@Override
protected void setTarget(EObject target) {
if (target.eResource() instanceof XtextResource) {
super.setTarget(target);
}
}
@Override
public boolean isAdapterForType(Object type) {
return type == ChangeAggregatorAdapter.class;
}
}
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