/* $Id: ChildGenRelated.java 17846 2010-01-12 19:37:12Z 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:

  *    tfmorris

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

  *

  * 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;

 import java.util.ArrayList;

 import java.util.Collections;

 import java.util.Enumeration;

 import java.util.List;

 import org.argouml.model.Model;

 import org.tigris.gef.base.Diagram;

 import org.tigris.gef.util.ChildGenerator;

 /**

  * Generator to find related elements for some model elements, such as for

  * Classes the attributes and operations, for diagrams nodes and elements, for

  * transitions trigger, guard and effects etc.

  *

  * @stereotype singleton

  * @author jrobbins

  */

 public class ChildGenRelated implements ChildGenerator {

     /**

      * The instance.

      */

     private static final ChildGenRelated SINGLETON = new ChildGenRelated();

     /**

      * @return Returns the singleton.

      */

     public static ChildGenRelated getSingleton() {

         return SINGLETON;

     }

     /**

      * Reply a java.util.Enumeration of the children of the given Object Returns

      * an enumeration or null if not possible to get the children.

      *

      * @see org.tigris.gef.util.ChildGenerator#gen(java.lang.Object)

      */

     public Enumeration gen(Object o) {

         // This is carried over from previous implementation

         // not sure why we don't want contents of package - tfm - 20060214

         if (Model.getFacade().isAPackage(o)) {

             return null;

         }

         if (o instanceof Diagram) {

             List res = new ArrayList();

             Diagram d = (Diagram) o;

             res.add(d.getGraphModel().getNodes());

             res.add(d.getGraphModel().getEdges());

             return Collections.enumeration(res);

         }

         // For all other model elements, return any elements

         // associated in any way

         if (Model.getFacade().isAUMLElement(o)) {

             return Collections.enumeration(Model.getFacade()

                     .getModelElementAssociated(o));

         }

         throw new IllegalArgumentException("Unknown element type " + o);

     }

     /**

      * The UID.

      */

     private static final long serialVersionUID = -893946595629032267L;

 } /* end class ChildGenRelated */