/* $Id: ModeCreateCommentEdge.java 17865 2010-01-12 20:45:26Z 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) 2005-2008 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.diagram.ui;

 import org.argouml.model.Model;

 import org.argouml.uml.CommentEdge;

 import org.tigris.gef.presentation.Fig;

 /**

  * A Mode to interpret user input while creating a comment edge.

  * The comment can connect an existing comment node to any other existing

  * node or edge.

  */

 public final class ModeCreateCommentEdge extends ModeCreateGraphEdge {

     /*

      * If we're drawing to an edge then only allow if the start is a comment

      * @see org.argouml.uml.diagram.ui.ModeCreateGraphEdge#isConnectionValid(org.tigris.gef.presentation.Fig, org.tigris.gef.presentation.Fig)

      */

     @Override

     protected final boolean isConnectionValid(Fig source, Fig dest) {

         if (dest instanceof FigNodeModelElement) {

             Object srcOwner = source.getOwner();

             Object dstOwner = dest.getOwner();

             if (!Model.getFacade().isAModelElement(srcOwner)

                     || !Model.getFacade().isAModelElement(dstOwner)) {

                 return false;

             }

             if (Model.getModelManagementHelper().isReadOnly(srcOwner)

                     || Model.getModelManagementHelper().isReadOnly(dstOwner)) {

                 return false;

             }

             return Model.getFacade().isAComment(srcOwner)

                     || Model.getFacade().isAComment(dstOwner);

         } else {

             return true;

         }

     }

     protected final Object getMetaType() {

         return CommentEdge.class;

     }

 }