package ca.ubc.cs.spl.aspectPatterns.examples.iterator.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.aspectPatterns.
*
* For more details and the latest version of this code, please see:
* http://www.cs.ubc.ca/labs/spl/projects/aodps.html
*
* Contributor(s):
*/
import java.util.Iterator;
/**
* Implements the driver for the Iterator design pattern example.<p>
*
* Intent: <i>Provide a way to access the elements of an aggregate object
* sequentially without exposing its underlying representation.</i><p>
*
* Participating objects are <code>SimpleList</code> as <i>Aggregate</i>,
* <code>OpenList</code> as <i>ConcreteAggregate</i>, <code>
* java.util.Iterator</code> as <i>Iterator</i>, and <code>ReverseIterator
* </code> as <i>ConcreteIterator</i>.
*
* In this example, the concrete aggregate is a list that gets filled with
* five integer objects (1 to 5). The, the <code>ReverseIterator</code> is
* created and used to print all elements in reverse order.
*
* <p><i>This is the Java version.</i><p>
*
* @author Jan Hannemann
* @author Gregor Kiczales
* @version 1.1, 02/12/04
*
* @see SimpleList
* @see OpenList
* @see java.util.Iterator
* @see ReverseIterator
*/
public class Main {
/**
* Prints all elements in the iterator to <code>System.out</code>.
*
* @param iter the iterator which elements are to be printed
*/
private static void print(Iterator iter) {
while(iter.hasNext()) {
System.out.println(iter.next());
}
}
/**
* Implements the driver for the Iterator design pattern example.<p>
*
* In this example, the concrete aggregate is a list that gets filled with
* five integer objects (1 to 5). The, the <code>ReverseIterator</code> is
* created and used to print all elements in reverse order.
*
* @param args command line paramters, unused
*/
public static void main(String[] args) {
OpenList openList = new OpenList();
openList.append(new Integer(1));
openList.append(new Integer(2));
openList.append(new Integer(3));
openList.append(new Integer(4));
openList.append(new Integer(5));
System.out.println("List created, containing int objects 1, 2, 3, 4, 5.");
Iterator iter = openList.createReverseIterator();
System.out.println("Using ReverseIterator to print list elements in reverse order...");
print(iter);
System.out.println("done.");
}
}