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/*******************************************************************************
* Copyright (c) 2010-2013, Abel Hegedus, 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.api;
import static tools.refinery.viatra.runtime.matchers.util.Preconditions.checkArgument;
import java.util.Collection;
import java.util.HashSet;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EStructuralFeature;
/**
* Adapter class for lightweight observer which filters feature updates to a selected set of features.
*
* @author Abel Hegedus
*
*/
public abstract class LightweightEObjectObserverAdapter implements LightweightEObjectObserver {
private Collection<EStructuralFeature> observedFeatures;
/**
* Creates a new adapter with the given set of observed features.
*/
public LightweightEObjectObserverAdapter(Collection<EStructuralFeature> observedFeatures) {
checkArgument(observedFeatures != null, "List of observed features must not be null!");
this.observedFeatures = new HashSet<>(observedFeatures);
}
public void observeAdditionalFeature(EStructuralFeature observedFeature) {
checkArgument(observedFeature != null, "Cannot observe null feature!");
this.observedFeatures.add(observedFeature);
}
public void observeAdditionalFeatures(Collection<EStructuralFeature> observedFeatures) {
checkArgument(observedFeatures != null, "List of additional observed features must not be null!");
this.observedFeatures.addAll(observedFeatures);
}
public void removeObservedFeature(EStructuralFeature observedFeature) {
checkArgument(observedFeature != null, "Cannot remove null observed feature!");
this.observedFeatures.remove(observedFeature);
}
public void removeObservedFeatures(Collection<EStructuralFeature> observedFeatures) {
checkArgument(observedFeatures != null, "List of observed features to remove must not be null!");
this.observedFeatures.removeAll(observedFeatures);
}
@Override
public void notifyFeatureChanged(EObject host, EStructuralFeature feature, Notification notification) {
if(this.observedFeatures.contains(feature)) {
observedFeatureUpdate(host, feature, notification);
}
}
/**
* This method is called when the feature that changed is among the observed features of the adapter.
*
* @param host
* @param feature
* @param notification
*/
public abstract void observedFeatureUpdate(EObject host, EStructuralFeature feature, Notification notification);
}
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