1 files changed, 207 insertions, 0 deletions
diff --git a/extraplugins/layers/org.eclipse.papyrus.layers.runtime/src/org/eclipse/papyrus/layers/runtime/LayersStackApplicationEventNotifier.java b/extraplugins/layers/org.eclipse.papyrus.layers.runtime/src/org/eclipse/papyrus/layers/runtime/LayersStackApplicationEventNotifier.java
new file mode 100644
index 00000000000..faa10ed9415
--- /dev/null
+++ b/extraplugins/layers/org.eclipse.papyrus.layers.runtime/src/org/eclipse/papyrus/layers/runtime/LayersStackApplicationEventNotifier.java
@@ -0,0 +1,207 @@
+/*******************************************************************************
+ * 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.papyrus.layers.runtime.model.LayersModel;
+import org.eclipse.papyrus.layers.stackmodel.layers.LayersPackage;
+import org.eclipse.papyrus.layers.stackmodel.layers.LayersStack;
+import org.eclipse.papyrus.layers.stackmodel.layers.LayersStackApplication;
+
+
+/**
+ * This class listen to a {@link LayersStackApplication} and send following to listeners:
+ * <ul>
+ *   <li>LayerStack added</li>
+ *   <li>LayerStack removed</li>
+ * </ul>
+ * 
+ * @author cedric dumoulin
+ *
+ */
+public class LayersStackApplicationEventNotifier {
+
+	protected LayersModel layersModel;
+
+	/**
+	 * List of listener to notify.
+	 */
+	protected List<ILayersStackApplicationEventListener> listeners = new ArrayList<ILayersStackApplicationEventListener>();
+	
+	/**
+	 * listener on LayerStack events
+	 */
+	protected Adapter layerStackListener = new AdapterImpl() {
+		public void notifyChanged(Notification msg) {
+			
+			switch(msg.getFeatureID(LayersStackApplication.class)) {
+			  case LayersPackage.LAYERS_STACK_APPLICATION__LAYERS_STACKS :
+				  switch(msg.getEventType()) {
+					case Notification.ADD:
+						// a layerStack is added to application
+						// layerStack = msg.getNewValue()
+						layerStackAdded(msg);
+						break;
+
+					case Notification.REMOVE:
+						// a layerStack is removed from application
+						// layerStack = msg.getOldValue()
+						layerStackRemoved(msg);
+						break;
+
+					default:
+						break;
+				  }
+				  break;
+			};
+		};
+	};
+	
+	/**
+	 * Constructor.
+	 *
+	 * @param layersModel
+	 */
+	public LayersStackApplicationEventNotifier(LayersModel layersModel) {
+		this.layersModel = layersModel;
+		activate();
+	}
+
+	/**
+	 * Constructor.
+	 *
+	 * @param layersModel
+	 * @param activate True if the notifier should be activated immediately. False otherwise.
+	 */
+	public LayersStackApplicationEventNotifier(LayersModel layersModel, boolean activate) {
+		this.layersModel = layersModel;
+		if( activate) {
+		  activate();
+		}
+	}
+
+	/**
+	 * Activate the listeners.
+	 * 
+	 */
+	protected void activate() {
+		// Listen on LayerStackApplication for LayerStack creation
+		// TODO Avoid to create the application here. Listen on its creation
+		// and listen on it when created.
+		
+		LayersStackApplication application = layersModel.getLayerStackApplication();
+		
+		application.eAdapters().add( layerStackListener );
+	}
+
+	/**
+	 * Deactivate listeners
+	 */
+	protected void deactivate() {
+		// The application can be already deactivated (because we are in dispose()
+		// See bug 431121
+		LayersStackApplication application = layersModel.lookupLayerStackApplication();
+		if( application != null) {
+			application.eAdapters().remove( layerStackListener );
+		}
+	}
+	
+	/**
+	 * Dispose the synchronizer
+	 */
+	protected 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 addLayersModelEventListener(ILayersStackApplicationEventListener 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(ILayersStackApplicationEventListener listener) {
+
+		listeners.remove(listener);
+	}
+	
+	/**
+	 * Called by events when a {@link LayersStack} is added to the {@link LayersStackApplication}
+	 * @param msg
+	 */
+	protected void layerStackAdded(Notification msg) {
+		for(ILayersStackApplicationEventListener listener : listeners) {
+			listener.layerStackAdded(msg);
+		}
+	}
+	
+	/**
+	 * Called by events when a {@link LayersStack} is removed from the {@link LayersStackApplication}
+	 * @param msg
+	 */
+	protected void layerStackRemoved(Notification msg) {
+		for(ILayersStackApplicationEventListener listener : listeners) {
+			listener.layerStackRemoved(msg);
+		}
+	}
+
+	/**
+	 * Utility method returning the layer stack in case of addedLayer event.
+	 * @param msg
+	 * @return
+	 */
+	public static LayersStack getAddedLayerStack(Notification msg) {
+		return (LayersStack)msg.getNewValue();
+	}
+	
+	/**
+	 * Utility method returning the layer stack in case of removeLayer event.
+	 * @param msg
+	 * @return
+	 */
+	public static LayersStack getRemovedLayerStack(Notification msg) {
+		return (LayersStack)msg.getOldValue();
+	}
+	
+
+}