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/*****************************************************************************
* Copyright (c) 2014 CEA LIST and others.
*
* 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:
* CEA LIST - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.emf.facet.efacet.core.internal;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.common.notify.impl.AdapterImpl;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.ETypedElement;
import org.eclipse.emf.ecore.util.EcoreUtil;
/**
* A cache of resolved facet overrides for an {@link EObject}. It expunges itself automatically when
* it detects that it is out-of-date with respect to the {@link FacetManagerContext}.
*/
class FacetCache extends AdapterImpl {
private final FacetManagerContext context;
private long currentGeneration = -1;
private final Map<ETypedElement, ETypedElement> overrides = new HashMap<ETypedElement, ETypedElement>();
FacetCache(EObject owner, FacetManagerContext context) {
this.context = context;
owner.eAdapters().add(this);
}
static FacetCache getInstance(EObject element, FacetManagerContext context) {
FacetCache result = (FacetCache) EcoreUtil.getExistingAdapter(element, context);
if (result == null) {
result = new FacetCache(element, context);
}
return result;
}
@Override
public boolean isAdapterForType(Object type) {
return type == context;
}
@Override
public void notifyChanged(Notification msg) {
if (!msg.isTouch()) {
// It could be that some facet/customization predicate has changed for me. Purge the cache
currentGeneration = -1;
}
}
public <T extends ETypedElement> T resolve(T feature) {
if (context.facetGeneration > currentGeneration) {
// Purge and recompute as needed
overrides.clear();
currentGeneration = context.facetGeneration;
}
// This should be safe because we should only add mappings of matching types, although this cannot
// actually be enforced in any way
@SuppressWarnings("unchecked")
T result = (T) overrides.get(feature);
return result;
}
<T extends ETypedElement> void add(T feature, T override) {
overrides.put(feature, override);
}
}
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