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/*******************************************************************************
* Copyright (c) 2013 CEA LIST.
* 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:
* Cedric Dumoulin - cedric.dumoulin@lifl.fr
******************************************************************************/
package org.eclipse.papyrus.layers.runtime;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.emf.common.notify.Adapter;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.common.notify.impl.AdapterImpl;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.gmf.runtime.notation.Diagram;
import org.eclipse.papyrus.infra.gmfdiag.common.model.NotationModel;
import org.eclipse.papyrus.layers.stackmodel.layers.LayersStack;
import org.eclipse.papyrus.layers.stackmodel.layers.LayersStackApplication;
/**
* This class listen to a {@link Resource} and send following events to listeners:
* <ul>
* <li>diagram removed</li>
* </ul>
*
* @author cedric dumoulin
*
*/
public class NotationDiagramRemovedFromResourceEventNotifier {
protected NotationModel notationModel;
/**
* List of listener to notify.
*/
protected List<INotationDiagramRemovedEventListener> listeners = new ArrayList<INotationDiagramRemovedEventListener>();
protected Adapter notationDiagramRemovedListener = new AdapterImpl() {
@Override
public void notifyChanged(Notification msg) {
// TODO When a Resource is unloaded, each diagram is removed and a corresponding event is fired.
// We need to separate event from a regular removal (user choose to remove a diagram) from events
// event fired by 'resource.unload()' (to be done).
if (msg.getEventType() == Notification.REMOVE
&& msg.getNotifier() instanceof Resource
&& msg.getOldValue() instanceof Diagram) {
// A diagram is removed from its resource
// System.err.println("Resource notified. Feature=" + msg.getFeature()
// + ", type="+ msg.getEventType()
// + ", newValue=" + msg.getNewValue()
// + ", oldValue=" + msg.getOldValue());
Resource resource = (Resource) msg.getNotifier();
// Fire event only if resource is loaded. This should avoid firing event when the
// diagram is removed because the resource is unloading.
if (resource.isLoaded()) {
fireDiagramRemovedEvent(msg);
}
}
};
};
/**
* Constructor.
*
* @param layersModel
*/
public NotationDiagramRemovedFromResourceEventNotifier(NotationModel notationModel) {
this.notationModel = notationModel;
activate();
}
/**
* Activate the listeners.
*
*/
protected void activate() {
// Listen on diagram removed events
notationModel.getResource().eAdapters().add(notationDiagramRemovedListener);
}
/**
* Deactivate listeners
*/
protected void deactivate() {
// Listen on diagram removed events
notationModel.getResource().eAdapters().remove(notationDiagramRemovedListener);
}
/**
* Dispose the synchronizer
*/
protected void dispose() {
// Deactivate listeners
deactivate();
notationModel = null;
}
/**
* Return true if the object is disposed.
*
* @return
*/
protected boolean isDisposed() {
return notationModel == null;
}
/**
* Add the specified listener to the list of listener.
* Do not add it if the listener is already in the list.
*
* @param listener
*/
public void addLayersModelEventListener(INotationDiagramRemovedEventListener listener) {
if (listener == null) {
return;
}
// Check if exist
if (listeners.contains(listener)) {
return;
}
listeners.add(listener);
}
/**
* Remove the specified listener from the list of listeners.
*
* @param listener
*/
public void removeLayersModelEventListener(INotationDiagramRemovedEventListener listener) {
listeners.remove(listener);
}
/**
* Called by events when a {@link LayersStack} is added to the {@link LayersStackApplication}
*
* @param msg
*/
protected void fireDiagramRemovedEvent(Notification msg) {
for (INotationDiagramRemovedEventListener listener : listeners) {
listener.diagramRemoved(msg);
}
}
/**
* Get the removed diagram in case of diagramRemoved event
*
* @param msg
* @return
*/
public static Diagram getRemovedDiagram(Notification msg) {
return (Diagram) msg.getOldValue();
}
}
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