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Wed Mar 24 16:00:00 GMT 2004
Queue
package examples.state.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 <i>context</i> of the queue example. This is effectively * a queue with limited capacity. Requests are forwared to the current state * object. * * @author Jan Hannemann * @author Gregor Kiczales * @version 1.0, 06/13/02 * */ public class Queue implements QueueContext { /** * the current state of this context */ protected QueueState state = new QueueEmpty(); /** * Tries to insert an object into the queue. Returns true if successful, * false otherwiese. * * @param arg the object to be inserted into the queue * @returns true if insertion was successful, false otherwise. */ public boolean insert(Object arg) { // Inserts a new Object into the queue return state.insert(this, arg); } /** * Returns the first item in the queue * * @returns the first item in the queue */ public Object getFirst() { // Returns the first element in the queue return state.getFirst(this); } /** * Tries to remove an object from the queue. Returns true if successful, * false otherwiese. * * @returns true if deletion was successful, false otherwise. */ public boolean removeFirst() { // Removes the first element from the queue return state.removeFirst(this); } /** * Sets the state of the context to the arguments state. * * @param state the new state for the context object. */ public void setState(QueueState state) { this.state = state; } }
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