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package ca.ubc.cs.spl.aspectPatterns.patternLibrary;
/* -*- 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 https://www.mozilla.org/MPL/ or https://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.aspectPatterns.
*
* For more details and the latest version of this code, please see:
* https://www.cs.ubc.ca/labs/spl/projects/aodps.html
*
* Contributor(s):
*/
import java.util.Hashtable;
/**
* Implements the the abstract Strategy design pattern protocol<p>
*
* Defines the <i>Strategy</i> and <i>Context</i> role. Also provides
* methods for setting and retrieving the <i>Strategy</i> for a
* given <i>Context</i>.
*
* It is also possible (although not shown here) to provide abstract
* pointcuts for setting or removing <i>Strategy</i>s from
* <i>Context</>s. This would allow <i>Client</i> implementations
* to be free of pattern code. For an example of how to do that,
* see the implementation of the abstract CommandProtocol aspect.
*
* @author Jan Hannemann
* @author Gregor Kiczales
* @version 1.1, 02/17/04
*/
public abstract aspect StrategyProtocol {
/**
* Stores the current strategy for each context
*
* @param numbers the int array to sort
*/
Hashtable strategyPerContext = new Hashtable();
/**
* Defines the <i>Strategy</i> role
*/
protected interface Strategy { }
/**
* Defines the <i>Context</i> role
*/
protected interface Context { }
/**
* Sets the strategy for a given context
*
* @param c the context to set the strategy for
* @param s the new strategy
*/
public void setConcreteStrategy(Context c, Strategy s) {
strategyPerContext.put(c, s);
}
/**
* Returns the strategy for a given context
*
* @param c the context object
* @return the strategy object for that context
*/
public Strategy getConcreteStrategy(Context c) {
return (Strategy) strategyPerContext.get(c);
}
}
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