com.mchange.util.impl.CircularListQueue Maven / Gradle / Ivy
/*
* Distributed as part of mchange-commons-java 0.2.9
*
* Copyright (C) 2015 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of EITHER:
*
* 1) The GNU Lesser General Public License (LGPL), version 2.1, as
* published by the Free Software Foundation
*
* OR
*
* 2) The Eclipse Public License (EPL), version 1.0
*
* You may choose which license to accept if you wish to redistribute
* or modify this work. You may offer derivatives of this work
* under the license you have chosen, or you may provide the same
* choice of license which you have been offered here.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received copies of both LGPL v2.1 and EPL v1.0
* along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
* If not, the text of these licenses are currently available at
*
* LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php
*
*/
package com.mchange.util.impl;
import com.mchange.util.*;
public class CircularListQueue implements Queue, Cloneable
{
CircularList list;
public int size() {return list.size();}
public boolean hasMoreElements() {return list.size() > 0;}
public void enqueue(Object obj) {list.appendElement(obj);}
public Object peek() {return list.getFirstElement();}
public Object dequeue()
{
Object out = list.getFirstElement();
list.removeFirstElement();
return out;
}
/**
* Returns a shallow copy. The queue is
* cloned, but not the elements within it.
*/
public Object clone()
{return new CircularListQueue((CircularList) list.clone());}
public CircularListQueue ()
{this.list = new CircularList();}
private CircularListQueue(CircularList list)
{this.list = list;}
}