/* $Id: GraphChangeAdapter.java 17850 2010-01-12 19:53:35Z linus $

  *****************************************************************************

  * Copyright (c) 2009 Contributors - see below

  * 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:

  *    mvw

  *****************************************************************************

  *

  * Some portions of this file was previously release using the BSD License:

  */

 // Copyright (c) 1996-2006 The Regents of the University of California. All

 // Rights Reserved. Permission to use, copy, modify, and distribute this

 // software and its documentation without fee, and without a written

 // agreement is hereby granted, provided that the above copyright notice

 // and this paragraph appear in all copies.  This software program and

 // documentation are copyrighted by The Regents of the University of

 // California. The software program and documentation are supplied "AS

 // IS", without any accompanying services from The Regents. The Regents

 // does not warrant that the operation of the program will be

 // uninterrupted or error-free. The end-user understands that the program

 // was developed for research purposes and is advised not to rely

 // exclusively on the program for any reason.  IN NO EVENT SHALL THE

 // UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,

 // SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS,

 // ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF

 // THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF

 // SUCH DAMAGE. THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY

 // WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

 // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE

 // PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF

 // CALIFORNIA HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT,

 // UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

 package org.argouml.uml.diagram;

 import org.argouml.model.DiDiagram;

 import org.argouml.model.DiElement;

 import org.argouml.model.Model;

 import org.tigris.gef.graph.GraphEvent;

 import org.tigris.gef.graph.GraphListener;

 import org.tigris.gef.graph.GraphModel;

 import org.tigris.gef.presentation.Fig;

 /**

  * Adapts changes in the Diagram subsystem (the graph presentation layer)

  * to changes in the Model subsyetm (diagram interchange model).

  * The curent implementaion does this by listening to graph events and

  * forwarding those as specific calls to the DiagramInterchangeModel.

  * This should be changed to a more standard Adapter architecture that

  * provides an interface for Figs and GraphModels to call only when required.

  *

  * @author Bob Tarling

  * @stereotype singleton

  */

 public final class GraphChangeAdapter implements GraphListener {

     /**

      * The instance.

      */

     private static final GraphChangeAdapter INSTANCE =

         new GraphChangeAdapter();

     /**

      * The getter for the instance.

      *

      * @return The instance.

      */

     public static GraphChangeAdapter getInstance() {

         return INSTANCE;

     }

     /**

      * The constructor of a singleton is private.

      */

     private GraphChangeAdapter() {

         // singleton, no instantiation

     }

     public DiDiagram createDiagram(Class type, Object owner) {

         if (Model.getDiagramInterchangeModel() != null) {

             return Model.getDiagramInterchangeModel()

                 .createDiagram(type, owner);

         }

         return null;

     }

     public void removeDiagram(DiDiagram dd) {

         if (Model.getDiagramInterchangeModel() != null) {

             Model.getDiagramInterchangeModel().deleteDiagram(dd);

         }

     }

     public DiElement createElement(GraphModel gm, Object node) {

         if (Model.getDiagramInterchangeModel() != null) {

             return Model.getDiagramInterchangeModel().createElement(

                 ((UMLMutableGraphSupport) gm).getDiDiagram(), node);

         }

         return null;

     }

     public void removeElement(DiElement element) {

         if (Model.getDiagramInterchangeModel() != null) {

             Model.getDiagramInterchangeModel().deleteElement(element);

         }

     }

     /*

      * @see org.tigris.gef.graph.GraphListener#nodeAdded(org.tigris.gef.graph.GraphEvent)

      */

     public void nodeAdded(GraphEvent e) {

         Object source = e.getSource();

         Object arg = e.getArg();

         if (source instanceof Fig) {

             source = ((Fig) source).getOwner();

         }

         if (arg instanceof Fig) {

             arg = ((Fig) arg).getOwner();

         }

         Model.getDiagramInterchangeModel().nodeAdded(source, arg);

     }

     /*

      * @see org.tigris.gef.graph.GraphListener#edgeAdded(org.tigris.gef.graph.GraphEvent)

      */

     public void edgeAdded(GraphEvent e) {

         Object source = e.getSource();

         Object arg = e.getArg();

         if (source instanceof Fig) {

             source = ((Fig) source).getOwner();

         }

         if (arg instanceof Fig) {

             arg = ((Fig) arg).getOwner();

         }

         Model.getDiagramInterchangeModel().edgeAdded(source, arg);

     }

     /*

      * @see org.tigris.gef.graph.GraphListener#nodeRemoved(org.tigris.gef.graph.GraphEvent)

      */

     public void nodeRemoved(GraphEvent e) {

         Object source = e.getSource();

         Object arg = e.getArg();

         if (source instanceof Fig) {

             source = ((Fig) source).getOwner();

         }

         if (arg instanceof Fig) {

             arg = ((Fig) arg).getOwner();

         }

         Model.getDiagramInterchangeModel().nodeRemoved(source, arg);

     }

     /*

      * @see org.tigris.gef.graph.GraphListener#edgeRemoved(org.tigris.gef.graph.GraphEvent)

      */

     public void edgeRemoved(GraphEvent e) {

         Object source = e.getSource();

         Object arg = e.getArg();

         if (source instanceof Fig) {

             source = ((Fig) source).getOwner();

         }

         if (arg instanceof Fig) {

             arg = ((Fig) arg).getOwner();

         }

         Model.getDiagramInterchangeModel().edgeRemoved(source, arg);

     }

     /*

      * @see org.tigris.gef.graph.GraphListener#graphChanged(org.tigris.gef.graph.GraphEvent)

      */

     public void graphChanged(GraphEvent e) {

         Object source = e.getSource();

         Object arg = e.getArg();

         if (source instanceof Fig) {

             source = ((Fig) source).getOwner();

         }

         if (arg instanceof Fig) {

             arg = ((Fig) arg).getOwner();

         }

         Model.getDiagramInterchangeModel().graphChanged(source, arg);

     }

 }