/* $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
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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("", "");
    }

}