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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.stackmodel.notifier;
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.ecore.util.EContentAdapter;
import org.eclipse.gmf.runtime.notation.Diagram;
import org.eclipse.gmf.runtime.notation.NotationPackage;
import org.eclipse.gmf.runtime.notation.View;
import org.eclipse.papyrus.layers.stackmodel.layers.LayersStack;
import org.eclipse.papyrus.layers.stackmodel.layers.LayersStackApplication;
/**
* An EMF {@link Adapter} listening on notation::diagram::view added and removed.
*
* This class listen to a {@link Diagram} and send following events to listeners:
* <ul>
* <li>view removed</li>
* <li>view added</li>
* </ul>
*
* @author cedric dumoulin
*
*/
public class DiagramViewChangedEventNotifier extends EContentAdapter {
boolean isDisposed = false;
/**
* List of listener to notify.
*/
protected List<IDiagramViewEventListener> listeners = new ArrayList<IDiagramViewEventListener>();
/**
* 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) {
// Self atttach
super.notifyChanged(notification);
// We are only interested in views (from newValue if set, or oldValue if removed)
// TODO Use an appropriate filter / Predicate to filter views.
Object newValue = notification.getNewValue();
if (!(newValue instanceof View || notification.getOldValue() instanceof View)) {
return;
}
// Check diagram modification
// There is 4 sources: View::persistedChildren and View::transientChildren
// Diagram::persistedChildren and Diagram::transientChildren
Object feature = notification.getFeature();
if (feature == NotationPackage.eINSTANCE.getView_PersistedChildren()
|| feature == NotationPackage.eINSTANCE.getView_TransientChildren()
|| feature == NotationPackage.eINSTANCE.getDiagram_PersistedEdges()
|| feature == NotationPackage.eINSTANCE.getDiagram_TransientEdges()) {
// LayerOperator::layers || LayersStack::layers
// check the event type.
switch (notification.getEventType()) {
case Notification.SET:
break;
case Notification.ADD:
// A view is added
fireDiagramViewAddedEvent(notification);
break;
case Notification.REMOVE:
// A layer is removed
fireDiagramViewRemovedEvent(notification);
break;
}
}
};
/**
* This Adapter is for {@link LayersTreeEventNotifier}.
*
* @see org.eclipse.emf.common.notify.impl.AdapterImpl#isAdapterForType(java.lang.Object)
*
* @param type
* @return
*/
@Override
public boolean isAdapterForType(Object type) {
return type == DiagramViewChangedEventNotifier.class;
}
/**
* Constructor.
*
* @param layersModel
*/
public DiagramViewChangedEventNotifier() {
}
/**
* Dispose the synchronizer
*/
public void dispose() {
if (isDisposed()) {
return;
}
isDisposed = true;
listeners.clear();
}
/**
* Return true if the object is disposed.
*
* @return
*/
public boolean isDisposed() {
return isDisposed == true;
}
/**
* 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(IDiagramViewEventListener 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(IDiagramViewEventListener listener) {
listeners.remove(listener);
}
/**
* Called by events when a {@link LayersStack} is added to the {@link LayersStackApplication}
*
* @param msg
*/
protected void fireDiagramViewAddedEvent(Notification msg) {
for (IDiagramViewEventListener listener : listeners) {
listener.diagramViewAdded(msg);
}
}
/**
* Called by events when a {@link LayersStack} is added to the {@link LayersStackApplication}
*
* @param msg
*/
protected void fireDiagramViewRemovedEvent(Notification msg) {
for (IDiagramViewEventListener listener : listeners) {
listener.diagramViewRemoved(msg);
}
}
/**
* Get the removed diagram in case of diagramRemoved event
*
* @param msg
* @return
*/
public static View viewAddedEvent_getAddedView(Notification msg) {
return (View) msg.getNewValue();
}
/**
* Get the removed diagram in case of diagramRemoved event
*
* @param msg
* @return
*/
public static View viewAddedEvent_getRemovedView(Notification msg) {
return (View) msg.getOldValue();
}
}
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