// $Id: DummyModelCommand.java 12 2010-04-03 00:07:22Z marcusvnac $
// Copyright (c) 2005-2006 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
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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
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// SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS,
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package org.argouml.model;

/**
 * Dummy commands are created where we haven't yet designed the correct
 * command for undoing an operation. It acts as a marker of work to be done
 * to complete the Undo implementation.
 * It also allows the save action to enable at the correct time. If there
 * is no command generated and fired back to the main application then
 * the save action will not enable.
 * @author Bob Tarling
 */
public class DummyModelCommand extends ModelCommand {

    @Override
    public void undo() {
        // Do nothing.
    }

    @Override
    public Object execute() {
        // Do nothing.
        return null;
    }

    @Override
    public boolean isUndoable() {
        return false;
    }

    @Override
    public boolean isRedoable() {
        return false;
    }
}