/* $Id: ActionNewGuard.java 17894 2010-01-12 21:29:01Z 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.

 // $header$

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

 import java.awt.event.ActionEvent;

 import org.argouml.model.Model;

 import org.argouml.ui.targetmanager.TargetManager;

 import org.argouml.uml.ui.AbstractActionNewModelElement;

 /**

  * The action to create a new Guard for a Transition. <p>

  * 

  * This action is (currently) not fit to create a guard for a transition 

  * that already has one! If this functionality is needed, then 

  * the old guard should be deleted before making a new one.

  * 

  * @since Dec 15, 2002

  * @author jaap.branderhorst@xs4all.nl

  */

 public class ActionNewGuard extends AbstractActionNewModelElement {

     private static ActionNewGuard singleton = new ActionNewGuard();

     /**

      * Constructor for ActionNewCallAction.

      */

     protected ActionNewGuard() {

         super();

     }

     /*

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

      */

     public void actionPerformed(ActionEvent e) {

         super.actionPerformed(e);

         TargetManager.getInstance().setTarget(

                 Model.getStateMachinesFactory().buildGuard(getTarget()));

     }

     /**

      * @return Returns the singleton.

      */

     public static ActionNewGuard getSingleton() {

         return singleton;

     }

     /*

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

      */

     public boolean isEnabled() {

         Object t = getTarget();

         return t != null

             && Model.getFacade().getGuard(t) == null;

     }

 }