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 }