1 package org.jaxen; 2 3 /* 4 * $Header: $ 5 * $Revision: $ 6 * $Date: $ 7 * 8 * ==================================================================== 9 * 10 * Copyright 2000-2005 bob mcwhirter & James Strachan. 11 * All rights reserved. 12 * 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions are 16 * met: 17 * 18 * * Redistributions of source code must retain the above copyright 19 * notice, this list of conditions and the following disclaimer. 20 * 21 * * Redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution. 24 * 25 * * Neither the name of the Jaxen Project nor the names of its 26 * contributors may be used to endorse or promote products derived 27 * from this software without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 30 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 31 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 32 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 33 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 34 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 35 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 36 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 37 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 38 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 39 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 40 * 41 * ==================================================================== 42 * This software consists of voluntary contributions made by many 43 * individuals on behalf of the Jaxen Project and was originally 44 * created by bob mcwhirter <bob@werken.com> and 45 * James Strachan <jstrachan@apache.org>. For more information on the 46 * Jaxen Project, please see <http://www.jaxen.org/>. 47 * 48 * $Id: $ 49 */ 50 51 import java.util.Collections; 52 import java.util.Iterator; 53 import java.util.ListIterator; 54 55 /*** 56 * Thread-safe constant iterators used to avoid the overhead of creating 57 * empty lists. 58 */ 59 public class JaxenConstants 60 { 61 62 private JaxenConstants() {} 63 64 /*** 65 * An iterator with no elements. <code>hasNext()</code> always 66 * returns false. This is thread-safe. 67 */ 68 public static final Iterator EMPTY_ITERATOR = Collections.EMPTY_LIST.iterator(); 69 70 /*** 71 * A list iterator with no elements. <code>hasNext()</code> always 72 * returns false. This is thread-safe. 73 */ 74 public static final ListIterator EMPTY_LIST_ITERATOR = Collections.EMPTY_LIST.listIterator(); 75 76 }