/* $Id: UMLChangeExpressionModel.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:

  *    mvw

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

  *

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

  */

 // Copyright (c) 2006-2008 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.ui.behavior.state_machines;

 import org.apache.log4j.Logger;

 import org.argouml.model.Model;

 import org.argouml.ui.targetmanager.TargetManager;

 import org.argouml.uml.ui.UMLExpressionModel2;

 import org.argouml.uml.ui.UMLUserInterfaceContainer;

 /**

  * The model for the boolean expression of a ChangeEvent.

  * 

  * @author michiel

  */

 class UMLChangeExpressionModel extends UMLExpressionModel2 {

     private static final Logger LOG =

         Logger.getLogger(UMLChangeExpressionModel.class);

     /**

      * The constructor.

      *

      * @param container the container of UML user interface components

      * @param propertyName the name of the property

      */

     public UMLChangeExpressionModel(UMLUserInterfaceContainer container,

             String propertyName) {

         super(container, propertyName);

     }

     /*

      * @see org.argouml.uml.ui.UMLExpressionModel2#getExpression()

      */

     public Object getExpression() {

         return Model.getFacade().getChangeExpression(

                 TargetManager.getInstance().getTarget());

     }

     /*

      * @see org.argouml.uml.ui.UMLExpressionModel2#setExpression(java.lang.Object)

      */

     public void setExpression(Object expression) {

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

         if (target == null) {

             throw new IllegalStateException("There is no target for "

                     + getContainer());

         }

         Model.getStateMachinesHelper().setChangeExpression(target, expression);

     }

     /*

      * @see org.argouml.uml.ui.UMLExpressionModel2#newExpression()

      */

     public Object newExpression() {

         LOG.debug("new boolean expression");

         return Model.getDataTypesFactory().createBooleanExpression("", "");

     }

 }