/*******************************************************************************
* <copyright>
*
* Copyright (c) 2005, 2010 SAP AG.
* 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:
* SAP AG - initial API, implementation and documentation
*
* </copyright>
*
*******************************************************************************/
package org.eclipse.graphiti.internal.services.impl;
import java.lang.ref.WeakReference;
import java.util.WeakHashMap;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.graphiti.dt.AbstractDiagramTypeProvider;
import org.eclipse.graphiti.dt.IDiagramTypeProvider;
import org.eclipse.graphiti.internal.services.IEmfService;
import org.eclipse.graphiti.mm.pictograms.Diagram;
/**
* @noinstantiate This class is not intended to be instantiated by clients.
* @noextend This class is not intended to be subclassed by clients.
*/
public final class EmfService implements IEmfService {
private WeakHashMap<Diagram, WeakReference<IDiagramTypeProvider>> diagToProvider = new WeakHashMap<Diagram, WeakReference<IDiagramTypeProvider>>();
public boolean isObjectAlive(EObject obj) {
return obj != null && obj.eResource() != null;
}
public IDiagramTypeProvider getDTPForDiagram(Diagram d) {
WeakReference<IDiagramTypeProvider> weakReference = diagToProvider.get(d);
if (weakReference == null || weakReference.get() == null) {
return new GenericDiagramTypeProvider() {
};
}
return weakReference.get();
}
public void wireDTPToDiagram(Diagram d, IDiagramTypeProvider provider) {
diagToProvider.put(d, new WeakReference<IDiagramTypeProvider>(provider));
}
/**
* Just a marker class. We want to return the generic provider to be able to
* work with diagrams (follow links etc) even if no DTP is registered.
* Scenario: extract the diagram object from a file and follow links to
* model objects-> link service needs the DTP to decide equality for bos
*/
private class GenericDiagramTypeProvider extends AbstractDiagramTypeProvider {
}
}