1 files changed, 162 insertions, 0 deletions
diff --git a/extraplugins/layers/org.eclipse.papyrus.layers.runtime/src/org/eclipse/papyrus/layers/runtime/NotationDiagramRemovedFromResourceEventNotifier.java b/extraplugins/layers/org.eclipse.papyrus.layers.runtime/src/org/eclipse/papyrus/layers/runtime/NotationDiagramRemovedFromResourceEventNotifier.java
new file mode 100644
index 00000000000..35f22c18782
--- /dev/null
+++ b/extraplugins/layers/org.eclipse.papyrus.layers.runtime/src/org/eclipse/papyrus/layers/runtime/NotationDiagramRemovedFromResourceEventNotifier.java
@@ -0,0 +1,162 @@
+/*******************************************************************************
+ * 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() {
+		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();
+	}
+	
+
+}