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/*******************************************************************************
* Copyright (c) 2015 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.diagram.sirius.internal;
import static com.google.common.collect.Collections2.filter;
import static org.eclipse.emf.compare.utils.EMFComparePredicates.CONTAINMENT_REFERENCE_CHANGE;
import static org.eclipse.emf.compare.utils.EMFComparePredicates.fromSide;
import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
import com.google.common.collect.Iterators;
import com.google.common.collect.Multimap;
import com.google.common.collect.Multimaps;
import com.google.common.collect.Sets;
import java.util.Iterator;
import java.util.Set;
import org.eclipse.emf.common.util.Monitor;
import org.eclipse.emf.compare.Comparison;
import org.eclipse.emf.compare.Diff;
import org.eclipse.emf.compare.DifferenceKind;
import org.eclipse.emf.compare.ReferenceChange;
import org.eclipse.emf.compare.diagram.internal.extensions.DiagramDiff;
import org.eclipse.emf.compare.postprocessor.IPostProcessor;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.gmf.runtime.notation.NotationPackage;
import org.eclipse.gmf.runtime.notation.View;
import org.eclipse.sirius.diagram.DNode;
import org.eclipse.sirius.diagram.DiagramPackage;
import org.eclipse.sirius.diagram.description.NodeMapping;
import org.eclipse.sirius.viewpoint.DSemanticDecorator;
import org.eclipse.sirius.viewpoint.ViewpointPackage;
/**
* A post processor to refine the differences found on a Sirius model.
*
* @author <a href="mailto:cedric.brun@obeo.fr">Cedric Brun</a>
*/
@SuppressWarnings("restriction")
public class SiriusDiffPostProcessor implements IPostProcessor {
/**
* Create a new predicate to check whether the value of a {@link ReferenceChange} is of a given type.
*
* @param clazz
* an EClass.
* @return true if the value of the {@link ReferenceChange} is of the given type.
*/
private static Predicate<ReferenceChange> valueIsKindOf(final EClass clazz) {
return new Predicate<ReferenceChange>() {
public boolean apply(ReferenceChange diff) {
return clazz.isSuperTypeOf(diff.getValue().eClass());
}
};
}
private static Function<? super ReferenceChange, EObject> getReferenceChangeValue() {
return new Function<ReferenceChange, EObject>() {
public EObject apply(ReferenceChange diff) {
return diff.getValue();
}
};
}
/**
* {@inheritDoc}
*/
public void postMatch(Comparison comparison, Monitor monitor) {
}
/**
* {@inheritDoc}
*/
public void postDiff(Comparison comparison, Monitor monitor) {
}
/**
* {@inheritDoc}
*/
public void postRequirements(Comparison comparison, Monitor monitor) {
/*
* Any added/deleted DSemanticDecorator must require the corresponding getTarget() addition/removal
*/
Iterable<ReferenceChange> allContainmentRefChanges = Iterables.filter(
Iterables.filter(comparison.getDifferences(), ReferenceChange.class),
CONTAINMENT_REFERENCE_CHANGE);
Iterable<ReferenceChange> addedOrRemovedSemanticDecorators = Iterables.filter(
allContainmentRefChanges, valueIsKindOf(ViewpointPackage.eINSTANCE.getDSemanticDecorator()));
Multimap<EObject, ReferenceChange> diffsByValue = Multimaps.index(allContainmentRefChanges,
getReferenceChangeValue());
/*
* Any added or removed semantic decorator should have a dependency to the corresponding
* addition/removal of semantic element.
*/
for (ReferenceChange referenceChange : addedOrRemovedSemanticDecorators) {
DSemanticDecorator value = (DSemanticDecorator)referenceChange.getValue();
if (value.getTarget() != null) {
EObject semanticTarget = value.getTarget();
addRequiresToDecoratedElement(diffsByValue, referenceChange, semanticTarget);
}
/*
* A DNode should always have its actualMapping reference set.
*/
if (value instanceof DNode) {
NodeMapping map = ((DNode)value).getActualMapping();
if (map != null) {
for (ReferenceChange actualMappingChange : Iterables
.filter(comparison.getDifferences(map), ReferenceChange.class)) {
if (actualMappingChange.getReference() == DiagramPackage.eINSTANCE
.getDNode_ActualMapping()
&& fromSide(referenceChange.getSource()).apply(actualMappingChange)) {
referenceChange.getImplies().add(actualMappingChange);
}
}
}
}
}
/*
* Any added or removed gmf Node should have a dependency to the corresponding addition/removal of a
* DSemantic decorator.
*/
Iterable<ReferenceChange> addedOrRemovedGmfView = Iterables.filter(allContainmentRefChanges,
valueIsKindOf(NotationPackage.eINSTANCE.getView()));
for (ReferenceChange referenceChange : addedOrRemovedGmfView) {
View value = (View)referenceChange.getValue();
/*
* beware here, GMF do som trick in getElement() and will return it's container element if the
* element is null..
*/
if (value.getElement() != null) {
EObject semanticTarget = value.getElement();
addRequiresToDecoratedElement(diffsByValue, referenceChange, semanticTarget);
}
}
}
/**
* Add diff requires for every change related to the semantic target.
*
* @param diffsByValue
* {@link ReferenceChange} differences indexed by value.
* @param referenceChange
* a given {@link ReferenceChange}.
* @param semanticTarget
* the semantic target.
*/
private void addRequiresToDecoratedElement(Multimap<EObject, ReferenceChange> diffsByValue,
ReferenceChange referenceChange, EObject semanticTarget) {
for (Diff valueDiff : diffsByValue.get(semanticTarget)) {
if (referenceChange.getKind() == DifferenceKind.ADD) {
if (valueDiff.getKind() == DifferenceKind.ADD
&& fromSide(referenceChange.getSource()).apply(valueDiff)) {
referenceChange.getRequires().add(valueDiff);
}
} else if (referenceChange.getKind() == DifferenceKind.DELETE) {
if (valueDiff.getKind() == DifferenceKind.DELETE
&& fromSide(referenceChange.getSource()).apply(valueDiff)) {
referenceChange.getRequires().add(valueDiff);
}
}
}
}
/**
* {@inheritDoc}
*/
public void postEquivalences(Comparison comparison, Monitor monitor) {
}
/**
* {@inheritDoc}
*/
public void postConflicts(Comparison comparison, Monitor monitor) {
}
/**
* {@inheritDoc}
*/
public void postComparison(Comparison comparison, Monitor monitor) {
/*
* We re-refine the refinements already setup by
* org.eclipse.emf.compare.diagram.internal.CompareDiagramPostProcessor
*/
Iterator<DiagramDiff> it = Iterators.filter(comparison.eAllContents(), DiagramDiff.class);
while (it.hasNext()) {
DiagramDiff next = it.next();
Set<Diff> refinesToAdd = Sets.newLinkedHashSet();
for (Diff refined : next.getRefinedBy()) {
collectDifferenceRefines(comparison, refinesToAdd, refined.getMatch().getLeft());
collectDifferenceRefines(comparison, refinesToAdd, refined.getMatch().getRight());
}
next.getRefinedBy().addAll(filter(refinesToAdd, fromSide(next.getSource())));
}
}
/**
* Collect the differences which have to be added as a refinment of the current DiagramDiff.
*
* @param comparison
* the current comparison.
* @param refinesToAdd
* the set of differences to add as refinement.
* @param changedEObject
* any changed EObject.
*/
private void collectDifferenceRefines(Comparison comparison, Set<Diff> refinesToAdd,
EObject changedEObject) {
if (changedEObject instanceof View) {
View gmfView = (View)changedEObject;
if (gmfView.getElement() instanceof DSemanticDecorator) {
for (Diff diffOnSemanticDecorator : comparison.getDifferences(gmfView.getElement())) {
refinesToAdd.add(diffOnSemanticDecorator);
}
}
}
}
}
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