Ptidej-v5.2-master/POM Tests/data/ArgoUML_0.28/src/org/argouml/uml/diagram/ui/ModeCreateCommentEdge.java
// $Id: ModeCreateCommentEdge.java 15591 2008-08-20 00:21:10Z tfmorris $
// 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
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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;
    }
}
