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/*******************************************************************************
* Copyright (c) 2012 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.emf.compare.equi;
import java.util.Set;
import org.eclipse.emf.compare.CompareFactory;
import org.eclipse.emf.compare.ComparePackage;
import org.eclipse.emf.compare.Comparison;
import org.eclipse.emf.compare.Diff;
import org.eclipse.emf.compare.Equivalence;
import org.eclipse.emf.compare.ReferenceChange;
import org.eclipse.emf.compare.utils.ReferenceUtil;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.ecore.util.EcoreUtil;
/**
* The requirements engine is in charge of actually computing the equivalences between the differences.
* <p>
* This default implementation aims at being generic enough to be used for any model, whatever the metamodel.
* However, specific requirements might be necessary.
* </p>
* TODO document available extension possibilities.
*
* @author <a href="mailto:cedric.notot@obeo.fr">Cedric Notot</a>
*/
public class DefaultEquiEngine implements IEquiEngine {
/**
* Cross referencer which links business model objects to the related differences.
*/
private EcoreUtil.CrossReferencer crossReferencerModelObjectsToDiffs;
/**
* Constructor.
*/
public DefaultEquiEngine() {
}
/**
* Constructor with a cross referencer.
*
* @param crossReferencer
* The cross referencer.
*/
public DefaultEquiEngine(EcoreUtil.CrossReferencer crossReferencer) {
this.crossReferencerModelObjectsToDiffs = crossReferencer;
}
/**
* {@inheritDoc}
*
* @see org.eclipse.emf.compare.equi.IEquiEngine#computeEquivalences(org.eclipse.emf.compare.Comparison)
*/
public void computeEquivalences(Comparison comparison) {
if (crossReferencerModelObjectsToDiffs == null) {
crossReferencerModelObjectsToDiffs = ReferenceUtil.initializeCrossReferencer(comparison);
}
for (Diff difference : comparison.getDifferences()) {
checkForEquivalences(comparison, difference);
}
}
/**
* Checks the potential equivalence from the given <code>difference</code>.
*
* @param comparison
* The comparison this engine is expected to complete.
* @param difference
* The difference that is to be checked
*/
protected void checkForEquivalences(Comparison comparison, Diff difference) {
if (difference instanceof ReferenceChange) {
ReferenceChange diff = (ReferenceChange)difference;
if (diff.getReference().getEOpposite() != null) {
Equivalence equivalence = diff.getEquivalence();
if (equivalence == null) {
equivalence = CompareFactory.eINSTANCE.createEquivalence();
comparison.getEquivalences().add(equivalence);
equivalence.getDifferences().add(difference);
// Find the opposite difference to reference it from the equivalence:
EReference oppositeReference = diff.getReference().getEOpposite();
Set<Diff> equivalentDifferences = ReferenceUtil.getCrossReferences(
crossReferencerModelObjectsToDiffs, oppositeReference, ComparePackage.eINSTANCE
.getReferenceChange_Reference(), Diff.class);
for (Diff eqDiff : equivalentDifferences) {
equivalence.getDifferences().add(eqDiff);
}
}
}
}
}
}
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