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/*****************************************************************************
* Copyright (c) 2014, 2015 CEA LIST, Christian W. Damus, 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 - bug 465416
*
*****************************************************************************/
package org.eclipse.papyrus.infra.sync;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import org.eclipse.emf.common.command.Command;
import org.eclipse.emf.common.command.CommandWrapper;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.emf.ecore.util.EContentsEList;
import org.eclipse.emf.ecore.util.EcoreUtil;
import org.eclipse.emf.ecore.util.FeatureMapUtil;
import org.eclipse.emf.edit.command.AddCommand;
import org.eclipse.emf.edit.command.DeleteCommand;
import org.eclipse.emf.edit.command.RemoveCommand;
import org.eclipse.emf.edit.command.SetCommand;
import com.google.common.base.Objects;
/**
* A synchronization feature for synchronizing {@link EReference}s between {@link EObject}s.
*
* @author Laurent Wouters
*
* @param <M>
* The type of the underlying model element common to all synchronized items in a single bucket
*/
public abstract class EObjectEReferenceSyncFeature<M extends EObject> extends EStructuralFeatureSyncFeature<M, EObject> {
/**
* Initialized this feature
*
* @param bucket
* The bucket doing the synchronization
*/
public EObjectEReferenceSyncFeature(SyncBucket<M, EObject, Notification> bucket, EReference reference, EReference... more) {
super(bucket, reference, more);
}
@Override
protected List<? extends EObject> getContents(EObject backend) {
return new EContentsEList<EObject>(backend, features);
}
@Override
protected EObject getNotifier(EObject backend) {
return backend;
}
@Override
protected EObject getModelOfNotifier(EObject backendNotifier) {
return backendNotifier;
}
/**
* Obtains a command that simply copies the new model element into the same feature of the target.
*/
@Override
protected Command doGetAddCommand(final SyncItem<M, EObject> from, final SyncItem<M, EObject> to, final EObject newSource) {
EReference reference = getReferencingFeature(from.getBackend(), newSource);
final EObject copy = EcoreUtil.copy(newSource);
return new CommandWrapper(reference.isMany()
? AddCommand.create(getEditingDomain(), to.getBackend(), reference, copy)
: SetCommand.create(getEditingDomain(), to.getBackend(), reference, copy)) {
@Override
public Collection<?> getResult() {
return Collections.singletonList(copy);
}
};
}
@Override
protected Command doGetRemoveCommand(final SyncItem<M, EObject> from, final EObject oldSource, final SyncItem<M, EObject> to, final EObject oldTarget) {
EReference reference = getReferencingFeature(to.getBackend(), oldTarget);
return reference.isContainment()
? createDeleteCommand(oldTarget)
: reference.isMany()
? RemoveCommand.create(getEditingDomain(), to.getBackend(), reference, oldTarget)
: SetCommand.create(getEditingDomain(), to.getBackend(), reference, SetCommand.UNSET_VALUE);
}
protected Command createDeleteCommand(EObject object) {
return DeleteCommand.create(getEditingDomain(), object);
}
protected EReference getReferencingFeature(EObject owner, EObject referenced) {
EReference result = null;
for (int i = 0; (result == null) && (i < features.length); i++) {
if (contains(owner, features[i], referenced)) {
result = (EReference) features[i]; // We only allow references in the constructor
}
}
return result;
}
private boolean contains(EObject owner, EStructuralFeature feature, Object value) {
return FeatureMapUtil.isMany(owner, feature)
? ((Collection<?>) owner.eGet(feature)).contains(value)
: Objects.equal(owner.eGet(feature), value);
}
}
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