/* $Id: ActionSetAssociationRoleBase.java 17886 2010-01-12 21:15:17Z 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) 1996-2006 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

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

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 // UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

 // $header$

 package org.argouml.uml.ui.behavior.collaborations;

 import java.awt.event.ActionEvent;

 import org.argouml.model.Model;

 import org.argouml.uml.ui.UMLComboBox2;

 import org.argouml.ui.UndoableAction;

 /**

  * The action to set the base of an associationrole.

  * 

  * @since Oct 4, 2002

  * @author jaap.branderhorst@xs4all.nl

  */

 public class ActionSetAssociationRoleBase extends UndoableAction {

     /**

      * Constructor for ActionSetAssociationRoleBase.

      */

     public ActionSetAssociationRoleBase() {

         super();

     }

     /*

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

      */

     public void actionPerformed(ActionEvent e) {

         super.actionPerformed(e);

         if (e.getSource() instanceof UMLComboBox2) {

             UMLComboBox2 source = (UMLComboBox2) e.getSource();

             Object assoc = source.getSelectedItem();

             Object ar = source.getTarget();

             if (Model.getFacade().getBase(ar) == assoc) {

                 return; // base is already set to this assoc...

                 /* This check is needed, otherwise the setbase()

                  *  below gives an exception.*/

             }

             if (Model.getFacade().isAAssociation(assoc)

                     && Model.getFacade().isAAssociationRole(ar)) {

                 Model.getCollaborationsHelper().setBase(ar, assoc);

             }

         }

     }

 }