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Java > Open Source Codes > org > jaxen > JaxenConstants


1 package org.jaxen;
2
3 /*
4  * $Header: $
5  * $Revision: $
6  * $Date: $
7  *
8  * ====================================================================
9  *
10  * Copyright (C) 2000-2005 bob mcwhirter & James Strachan.
11  * All rights reserved.
12  *
13  * Redistribution and use in source and binary forms, with or without
14  * modification, are permitted provided that the following conditions
15  * are met:
16  *
17  * 1. Redistributions of source code must retain the above copyright
18  * notice, this list of conditions, and the following disclaimer.
19  *
20  * 2. Redistributions in binary form must reproduce the above copyright
21  * notice, this list of conditions, and the disclaimer that follows
22  * these conditions in the documentation and/or other materials
23  * provided with the distribution.
24  *
25  * 3. The name "Jaxen" must not be used to endorse or promote products
26  * derived from this software without prior written permission. For
27  * written permission, please contact license@jaxen.org.
28  *
29  * 4. Products derived from this software may not be called "Jaxen", nor
30  * may "Jaxen" appear in their name, without prior written permission
31  * from the Jaxen Project Management (pm@jaxen.org).
32  *
33  * In addition, we request (but do not require) that you include in the
34  * end-user documentation provided with the redistribution and/or in the
35  * software itself an acknowledgement equivalent to the following:
36  * "This product includes software developed by the
37  * Jaxen Project (http://www.jaxen.org/)."
38  * Alternatively, the acknowledgment may be graphical using the logos
39  * available at http://www.jaxen.org/
40  *
41  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
42  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
43  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
44  * DISCLAIMED. IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT
45  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
46  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
47  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
48  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
49  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
50  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
51  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52  * SUCH DAMAGE.
53  *
54  * ====================================================================
55  * This software consists of voluntary contributions made by many
56  * individuals on behalf of the Jaxen Project and was originally
57  * created by bob mcwhirter <bob@werken.com> and
58  * James Strachan <jstrachan@apache.org>. For more information on the
59  * Jaxen Project, please see <http://www.jaxen.org/>.
60  *
61  * $Id: $
62 */
63
64 import java.util.Collections JavaDoc;
65 import java.util.Iterator JavaDoc;
66 import java.util.ListIterator JavaDoc;
67
68 /**
69  * Thread-safe constant iterators used to avoid the overhead of creating
70  * empty lists.
71  */
72 public class JaxenConstants
73 {
74     
75     private JaxenConstants() {}
76
77     /**
78      * An iterator with no elements. <code>hasNext()</code> always
79      * returns false. This is thread-safe.
80      */
81     public static final Iterator JavaDoc EMPTY_ITERATOR = Collections.EMPTY_LIST.iterator();
82     
83     /**
84      * A list iterator with no elements. <code>hasNext()</code> always
85      * returns false. This is thread-safe.
86      */
87     public static final ListIterator JavaDoc EMPTY_LIST_ITERATOR = Collections.EMPTY_LIST.listIterator();
88     
89 }
90
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