/* $Id: ActionAddExistingEdge.java 17865 2010-01-12 20:45:26Z 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:

  *    bobtarling

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

  *

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

  */

 // Copyright (c) 1996-2008 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.ui;

 import java.awt.event.ActionEvent;

 import org.argouml.model.Model;

 import org.argouml.ui.targetmanager.TargetManager;

 import org.argouml.uml.diagram.ArgoDiagram;

 import org.argouml.uml.diagram.DiagramUtils;

 import org.tigris.gef.base.Globals;

 import org.tigris.gef.graph.MutableGraphModel;

 import org.argouml.ui.UndoableAction;

 /**

 * ActionAddExistingEdge enables pasting of an existing edge into a Diagram.

 */

 public class ActionAddExistingEdge extends UndoableAction {

     private static final long serialVersionUID = 736094733140639882L;

     private Object edge = null;

     /**

      * Constructor for ActionAddExistingEdge.

      *

      * @param name       the name of the action

      * @param edgeObject    the edge (the UML ModelElement!)

      */

     public ActionAddExistingEdge(String name, Object edgeObject) {

         super(name);

         edge = edgeObject;

     }

     /*

      * @see java.awt.event.ActionListener#actionPerformed(ActionEvent)

      */

     @Override

     public void actionPerformed(ActionEvent arg0) {

         super.actionPerformed(arg0);

         // we have an edge (the UML modelelement!)

         if (edge == null) {

             return;

         }

         // let's test which situation we have. 3 Possibilities:

         // 1. The nodes are already on the diagram, we can use

         //    canAddEdge for this.

         // 2. One of the nodes is already on the diagram. The other

         //    has to be added.

         // 3. Both of the nodes are not yet on the diagram.

         // For the time being we will only implement situation 1.

         // TODO: implement situation 2 and 3.

         MutableGraphModel gm = (MutableGraphModel) DiagramUtils

                 .getActiveDiagram().getGraphModel();

         if (gm.canAddEdge(edge)) { // situation 1

             gm.addEdge(edge);

             if (Model.getFacade().isAAssociationClass(edge)) {

                 ModeCreateAssociationClass.buildInActiveLayer(Globals

                         .curEditor(), edge);

             }

         }

     }

     /*

      * @see javax.swing.Action#isEnabled()

      */

     @Override

     public boolean isEnabled() {

         Object target = TargetManager.getInstance().getModelTarget();

         ArgoDiagram dia = DiagramUtils.getActiveDiagram();

         if (dia == null) {

             return false;

         }

         MutableGraphModel gm = (MutableGraphModel) dia.getGraphModel();

         return gm.canAddEdge(target);

     }

 }