/* $Id: GoClassToNavigableClass.java 17844 2010-01-12 19:35:07Z 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.ui.explorer.rules;

 import java.util.ArrayList;

 import java.util.Collection;

 import java.util.Collections;

 import java.util.HashSet;

 import java.util.Iterator;

 import java.util.List;

 import java.util.Set;

 import org.argouml.i18n.Translator;

 import org.argouml.model.Model;

 /**

  * Rule for Class->Navigable Class.

  *

  */

 public class GoClassToNavigableClass extends AbstractPerspectiveRule {

     /*

      * @see org.argouml.ui.explorer.rules.PerspectiveRule#getRuleName()

      */

     public String getRuleName() {

         return Translator.localize("misc.class.navigable-class");

     }

     /*

      * @see org.argouml.ui.explorer.rules.PerspectiveRule#getChildren(java.lang.Object)

      */

     public Collection getChildren(Object parent) {

         if (!Model.getFacade().isAClass(parent)) {

             return Collections.EMPTY_SET;

         }

         List childClasses = new ArrayList();

         Collection ends = Model.getFacade().getAssociationEnds(parent);

         if (ends == null) {

             return Collections.EMPTY_SET;

         }

         Iterator it = ends.iterator();

         while (it.hasNext()) {

             Object ae = /*(MAssociationEnd)*/ it.next();

             Object asc = Model.getFacade().getAssociation(ae);

             Collection allEnds = Model.getFacade().getConnections(asc);

             Object otherEnd = null;

             Iterator endIt = allEnds.iterator();

             if (endIt.hasNext()) {

                 otherEnd = /*(MAssociationEnd)*/ endIt.next();

                 if (ae != otherEnd && endIt.hasNext()) {

                     otherEnd = /*(MAssociationEnd)*/ endIt.next();

                     if (ae != otherEnd) {

                         otherEnd = null;

                     }

                 }

             }

             if (otherEnd == null) {

                 continue;

             }

             if (!Model.getFacade().isNavigable(otherEnd)) {

                 continue;

             }

             if (childClasses.contains(Model.getFacade().getType(otherEnd))) {

                 continue;

             }

             childClasses.add(Model.getFacade().getType(otherEnd));

             // TODO: handle n-way Associations

         }

         return childClasses;

     }

     /*

      * @see org.argouml.ui.explorer.rules.PerspectiveRule#getDependencies(java.lang.Object)

      */

     public Set getDependencies(Object parent) {

         if (Model.getFacade().isAClass(parent)) {

             Set set = new HashSet();

             set.add(parent);

             return set;

         }

         return Collections.EMPTY_SET;

     }

 }