/* $Id: ActivityDiagramGraphModel.java 17851 2010-01-12 19:53:47Z 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
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package org.argouml.uml.diagram.activity;

import org.argouml.model.Model;
import org.argouml.uml.diagram.state.StateDiagramGraphModel;

/**
 * The graphmodel for an activitydiagram. A graph model in argouml
 * implements rules for adding and removing elements.
 *
 * @since Jul 11, 2004
 * @author jaap.branderhorst@xs4all.nl
 */
public class ActivityDiagramGraphModel extends StateDiagramGraphModel {

    /*
     * @see org.tigris.gef.graph.MutableGraphModel#canAddNode(java.lang.Object)
     */
    public boolean canAddNode(Object node) {
        if (containsNode(node)) {
            return false;
        }
        if (Model.getFacade().isAPartition(node)) {
            return true;
        }
        return super.canAddNode(node);
    }

    /**
     * The UID.
     */
    private static final long serialVersionUID = 5047684232283453072L;
}