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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.model;
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.papyrus.layers.stackmodel.layers.LayersStackApplication;
/**
* This class listen to a {@link LayersModel} and send following events to listeners:
* <ul>
* <li>root of type {@link LayersStackApplication} added</li>
* <li>root of type {@link LayersStackApplication} removed</li>
* </ul>
*
* @author cedric dumoulin
* TODO Rename to LayersStackApplicationLifeCycleEventNotifier
*/
public class LayersModelEventRootNotifier {
protected LayersModel layersModel;
/**
* List of listener to notify.
*/
protected List<ILayersModelRootEventListener> listeners = new ArrayList<ILayersModelRootEventListener>();
protected Adapter modelListener = new AdapterImpl() {
/**
* Something happen on the tree of object
*
* @see org.eclipse.emf.ecore.util.EContentAdapter#notifyChanged(org.eclipse.emf.common.notify.Notification)
*
* @param msg
*/
@Override
public void notifyChanged(Notification notification) {
// Check Resource modification
// There is 1 sources:
// LayersModel::Resource::contents
if (notification.getFeatureID(Resource.class) == Resource.RESOURCE__CONTENTS) {
// LayerOperator::layers || LayersStack::layers
// check the event type.
switch (notification.getEventType()) {
case Notification.SET:
break;
case Notification.ADD:
// A root is added
if (notification.getNewValue() instanceof LayersStackApplication) {
fireLayersModelRootAddedEvent(notification);
}
break;
case Notification.REMOVE:
// A root is removed
if (notification.getOldValue() instanceof LayersStackApplication) {
fireLayersModelRootRemovedEvent(notification);
}
break;
}
}
}
};
/**
* Constructor.
*
* @param layersModel
*/
public LayersModelEventRootNotifier(LayersModel layersModel) {
this.layersModel = layersModel;
activate();
}
/**
* Activate the listeners.
*
*/
protected void activate() {
// Listen on diagram removed events
layersModel.getResource().eAdapters().add(modelListener);
}
/**
* Deactivate listeners
*/
protected void deactivate() {
// Listen on diagram removed events
layersModel.getResource().eAdapters().remove(modelListener);
}
/**
* Dispose the synchronizer
*/
public void dispose() {
// Deactivate listeners
deactivate();
layersModel = null;
}
/**
* Return true if the object is disposed.
*
* @return
*/
protected boolean isDisposed() {
return layersModel == 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 addEventListener(ILayersModelRootEventListener 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 removeEventListener(ILayersModelRootEventListener listener) {
listeners.remove(listener);
}
/**
* Called by events when a root is added to the {@link LayersModel}
*
* @param msg
*/
protected void fireLayersModelRootAddedEvent(Notification msg) {
for (ILayersModelRootEventListener listener : listeners) {
listener.layersModelRootAdded(msg);
}
}
/**
* Called by events when a root is added to the {@link LayersModel}
*
* @param msg
*/
protected void fireLayersModelRootRemovedEvent(Notification msg) {
for (ILayersModelRootEventListener listener : listeners) {
listener.layersModelRootRemoved(msg);
}
}
}
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