carfield.com.hk

BracketDecorator.java

2004-03-24T16:00:00Z

ConcreteOutput.java

2004-03-24T16:00:00Z

Main.java

2004-03-24T16:00:00Z

package examples.decorator.java;

/* -*- 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.pattern.
 *
 * Contributor(s): 
 */
 
/**
 * Implements the driver for the decorator design pattern example. 
 *
 * Intent: Attach additional responsibilities to an object dynamically. 
 * Decorators provide a flexible alternative to subclassing for extending 
 * functionality.
 *
 * Participating classes are <code>Output</code>s as Components,
 * <code>ConcreteOutput</code> as ConcreteComponent. The decorators 
 * are <code>OutputDecorator</code> as Decorator, and <code>
 * StarDecorator</code> and <code>BracketDecorator</code> as 
 * ConcreteDecorators.
 *
 * Experimental setup: Concrete decorator (ConcreteOutput) prints a
 * string, Decorators (StarDecorator and BracketDecorator) wrap other
 * output around it. Output should be: "[ *** <String> *** ]"
 *
 * This is the Java version. 
 *
 * This version allows for dynamic composition of decorators. 
 *
 * @author Jan Hannemann
 * @author Gregor Kiczales
 * @version 1.0, 06/13/02
 * 
 * @see Component
 * @see CompositeA 
 * @see LeafB
 */
 
public class Main {

 /**
 * Implements the driver for the decorator design pattern example. 
 *
 * Experimental setup: Concrete decorator (ConcreteOutput) prints a
 * string, Decorators (StarDecorator and BracketDecorator) wrap other
 * output around it. Output should be: "[ *** <String> *** ]" 
 *
 * @param args command line paramters, unused
 */
	
	public static void main(String[] args) {
	 
		Output original = new ConcreteOutput();
		Output stared = new StarDecorator(original);
		Output bracketed= new BracketDecorator(stared);
		
		bracketed.print("<String>"); 
		
		System.out.println();
	}
}

Output.java

2004-03-24T16:00:00Z

OutputDecorator.java

2004-03-24T16:00:00Z

package examples.decorator.java;

/* -*- 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.pattern.
 *
 * Contributor(s): 
 */
 
/**
 * Defines the Decorator interface. This is an abstract class to allow
 * for default implementations (set varible "output", provide default 
 * implementation for <code>print(String)</code>.
 *
 * @author Jan Hannemann
 * @author Gregor Kiczales
 * @version 1.0, 06/13/02
 */ 
 
public abstract class OutputDecorator implements Output {

 /**
 * the <code>Output</code> to decorate
 */ 

	protected Output output;
	
 /**
 * Prints the argument string to <code>System.out</code>. This method is
 * overwritten by concrete decorators. The default implementation 
 *
 * @param s the string to be printed.
 */
 
	public void print(String s) { 
		output.print(s);
	}
	
 /**
 * Defines the constructor signature. Also provides a default 
 * implementation so that concrete decorators don't have to 
 * re-implement can just call <code>super(..)</code> and don't have
 * to deal with setting the variable themselves.
 *
 * @param output the component to decorate.
 */
 
 	public OutputDecorator(Output output) {
		this.output = output;
	}
}

StarDecorator.java

2004-03-24T16:00:00Z

files.lst

2004-03-24T16:00:00Z