/* $Id: UMLExpressionExpressionModel.java 17896 2010-01-12 21:36:11Z 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) 2004-2009 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
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// 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,
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package org.argouml.core.propertypanels.ui;

import org.argouml.model.Model;

/**
 * The model for a UML Expression that is obtained from its "parent"
 * by getExpression - hence: Guard, ChangeEvent.
 *
 * @author Michiel, Penyaskito
 */
class UMLExpressionExpressionModel extends UMLExpressionModel {

    /**
     * The constructor.
     *
     */
    public UMLExpressionExpressionModel(Object target) {
        super(target, "expression");
    }

    /*
     * @see org.argouml.uml.ui.UMLExpressionModel2#getExpression()
     */
    public Object getExpression() {
        return Model.getFacade().getExpression(getTarget());
    }

    /*
     * @see org.argouml.uml.ui.UMLExpressionModel2#setExpression(java.lang.Object)
     */
    public void setExpression(Object expr) {
	assert (expr == null) || Model.getFacade().isAExpression(expr);
	Object target = getTarget();
	assert Model.getFacade().isAGuard(target)
		|| Model.getFacade().isAChangeEvent(target);
	Model.getStateMachinesHelper().setExpression(target, null);
	/* If we do not set it to null first, then we get a MDR DebugException: */
	Model.getStateMachinesHelper().setExpression(target, expr);
    }

    /*
     * @see org.argouml.uml.ui.UMLExpressionModel2#newExpression()
     */
    public Object newExpression(String lang, String body) {
        return Model.getDataTypesFactory().createBooleanExpression(lang, body);
    }
}