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/*******************************************************************************
* Copyright (c) 2010-2012, Tamas Szabo, Gabor Bergmann, Istvan Rath and Daniel Varro
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package tools.refinery.viatra.runtime.base.core;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EReference;
import tools.refinery.viatra.runtime.base.api.NavigationHelper;
import tools.refinery.viatra.runtime.base.itc.igraph.IGraphDataSource;
import tools.refinery.viatra.runtime.base.itc.igraph.IGraphObserver;
import tools.refinery.viatra.runtime.matchers.util.CollectionsFactory;
import tools.refinery.viatra.runtime.matchers.util.IMemoryView;
import tools.refinery.viatra.runtime.matchers.util.IMultiset;
// TODO IBiDirectionalGraphDataSource
public class EMFDataSource implements IGraphDataSource<EObject> {
private List<IGraphObserver<EObject>> observers;
private Set<EReference> references;
private Set<EClass> classes;
private NavigationHelper navigationHelper;
private IMultiset<EObject> allEObjects; // contains objects even if only appearing as sources or targets
/**
* @param navigationHelper
* @param references
* @param classes
* additional classes to treat as nodes. Source and target classes of references need not be added.
*/
public EMFDataSource(NavigationHelper navigationHelper, Set<EReference> references, Set<EClass> classes) {
this.references = references;
this.classes = classes;
this.observers = new LinkedList<IGraphObserver<EObject>>();
this.navigationHelper = navigationHelper;
}
@Override
public Set<EObject> getAllNodes() {
return getAllEObjects().distinctValues();
}
@Override
public IMemoryView<EObject> getTargetNodes(EObject source) {
IMultiset<EObject> targetNodes = CollectionsFactory.createMultiset();
for (EReference ref : references) {
final Set<EObject> referenceValues = navigationHelper.getReferenceValues(source, ref);
for (EObject referenceValue : referenceValues) {
targetNodes.addOne(referenceValue);
}
}
return targetNodes;
}
@Override
public void attachObserver(IGraphObserver<EObject> go) {
observers.add(go);
}
@Override
public void attachAsFirstObserver(IGraphObserver<EObject> observer) {
observers.add(0, observer);
}
@Override
public void detachObserver(IGraphObserver<EObject> go) {
observers.remove(go);
}
public void notifyEdgeInserted(EObject source, EObject target) {
nodeAdditionInternal(source);
nodeAdditionInternal(target);
for (IGraphObserver<EObject> o : observers) {
o.edgeInserted(source, target);
}
}
public void notifyEdgeDeleted(EObject source, EObject target) {
for (IGraphObserver<EObject> o : observers) {
o.edgeDeleted(source, target);
}
nodeRemovalInternal(source);
nodeRemovalInternal(target);
}
public void notifyNodeInserted(EObject node) {
nodeAdditionInternal(node);
}
public void notifyNodeDeleted(EObject node) {
nodeRemovalInternal(node);
}
private void nodeAdditionInternal(EObject node) {
if (allEObjects.addOne(node))
for (IGraphObserver<EObject> o : observers) {
o.nodeInserted(node);
}
}
private void nodeRemovalInternal(EObject node) {
if (getAllEObjects().removeOne(node))
for (IGraphObserver<EObject> o : observers) {
o.nodeDeleted(node);
}
}
protected IMultiset<EObject> getAllEObjects() {
if (allEObjects == null) {
allEObjects = CollectionsFactory.createMultiset();
for (EClass clazz : classes) {
for (EObject obj : navigationHelper.getAllInstances(clazz)) {
allEObjects.addOne(obj);
}
}
for (EReference ref : references) {
navigationHelper.processAllFeatureInstances(ref, (source, target) -> {
allEObjects.addOne(source);
allEObjects.addOne((EObject) target);
});
}
}
return allEObjects;
}
}
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