Wed Mar 24 16:00:00 GMT 2004

Command

package ca.ubc.cs.spl.pattern.library; /* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- * * This file is part of the design patterns project at UBC * * The contents of this file are subject to the Mozilla Public License * Version 1.1 (the "License"); you may not use this file except in * compliance with the License. You may obtain a copy of the License at * either http://www.mozilla.org/MPL/ or http://aspectj.org/MPL/. * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is ca.ubc.cs.spl.patterns. * * Contributor(s): */ /** * This interface is implemented by <i>Command</i> objects. * * @author Jan Hannemann * @author Gregor Kiczales * @version 1.0, 05/13/02 * * @see Button * @see Label */ public interface Command { /** * Executes the command. * * @param receiver the object this command is manipulating. */ public void executeCommand(CommandReceiver receiver); /** * Queries the command's executable status. This interface method is * optional (default: all commands are excutable); a default * implementation is provided by the abstract CommandProtocol aspect. * * @returns a boolean indicating whether the command is excutable. */ public boolean isExecutable(); public void execute(); // dummy, aspect calls executeCommand(Receiver) if this method is called }


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