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/*******************************************************************************
* Copyright (c) 2006, 2011 Obeo.
* 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:
* Obeo - initial API and implementation
*******************************************************************************/
package org.eclipse.papyrus.infra.emf.compare.merger;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.emf.compare.diff.merge.DefaultMerger;
import org.eclipse.emf.compare.diff.merge.service.MergeService;
import org.eclipse.emf.compare.diff.metamodel.DiffElement;
import org.eclipse.emf.compare.diff.metamodel.ModelElementChangeLeftTarget;
import org.eclipse.emf.compare.diff.metamodel.ModelElementChangeRightTarget;
import org.eclipse.emf.compare.diff.metamodel.UpdateReference;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EReference;
/**
* Merger for an {@link UpdateUniqueReferenceValue} operation.
*
* @author <a href="mailto:laurent.goubet@obeo.fr">Laurent Goubet</a>
*/
public class UpdateReferenceMerger extends DefaultMerger {
/**
* {@inheritDoc}
*
* @see org.eclipse.emf.compare.diff.merge.api.AbstractMerger#doApplyInOrigin()
*/
@Override
public void doApplyInOrigin() {
final UpdateReference theDiff = (UpdateReference)this.diff;
final EReference reference = theDiff.getReference();
final EObject element = theDiff.getLeftElement();
final EObject leftTarget = (EObject)theDiff.getRightElement().eGet(reference);
final EObject matchedLeftTarget = theDiff.getLeftTarget();
if (leftTarget == null) {
// We're unsetting the value, no need to copy
element.eUnset(reference);
} else {
MergeService.getCopier(diff).copyReferenceValue(reference, element, leftTarget,
matchedLeftTarget, -1);
}
}
/**
* {@inheritDoc}
*
* @see org.eclipse.emf.compare.diff.merge.api.AbstractMerger#doUndoInTarget()
*/
@Override
public void doUndoInTarget() {
final UpdateReference theDiff = (UpdateReference)this.diff;
final EReference reference = theDiff.getReference();
final EObject element = theDiff.getRightElement();
final EObject rightTarget = (EObject)theDiff.getLeftElement().eGet(reference);
final EObject matchedRightTarget = theDiff.getRightTarget();
if (rightTarget == null) {
// We're unsetting the value, no need to copy
element.eUnset(reference);
} else {
MergeService.getCopier(diff).copyReferenceValue(reference, element, rightTarget,
matchedRightTarget, -1);
}
}
/**
* {@inheritDoc}
*
* @see org.eclipse.emf.compare.diff.merge.DefaultMerger#getDependencies(boolean)
*/
@Override
protected List<DiffElement> getDependencies(boolean applyInOrigin) {
final List<DiffElement> diffs = diff.getRequires();
final List<DiffElement> result = new ArrayList<DiffElement>();
for (DiffElement diffElement : diffs) {
if (applyInOrigin && diffElement instanceof ModelElementChangeRightTarget) {
result.add(diffElement);
} else if (!applyInOrigin && diffElement instanceof ModelElementChangeLeftTarget) {
result.add(diffElement);
}
}
return result;
}
}
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