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Java > Open Source Codes > org > dom4j > xpath > DefaultNamespaceContext


1 /*
2  * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
3  *
4  * This software is open source.
5  * See the bottom of this file for the licence.
6  */
7
8 package org.dom4j.xpath;
9
10 import java.io.Serializable JavaDoc;
11
12 import org.dom4j.Document;
13 import org.dom4j.Element;
14 import org.dom4j.Namespace;
15 import org.dom4j.Node;
16
17 import org.jaxen.NamespaceContext;
18
19 /**
20  * <p>
21  * <code>DefaultNamespaceContext</code> implements a Jaxen NamespaceContext
22  * such that a context node is used to determine the current XPath namespace
23  * prefixes and namespace URIs available.
24  * </p>
25  *
26  * @author <a HREF="mailto:jstrachan@apache.org">James Strachan </a>
27  */
28 public class DefaultNamespaceContext implements NamespaceContext, Serializable JavaDoc {
29     private final Element element;
30
31     public DefaultNamespaceContext(Element element) {
32         this.element = element;
33     }
34
35     public static DefaultNamespaceContext create(Object JavaDoc node) {
36         Element element = null;
37
38         if (node instanceof Element) {
39             element = (Element) node;
40         } else if (node instanceof Document) {
41             Document doc = (Document) node;
42             element = doc.getRootElement();
43         } else if (node instanceof Node) {
44             element = ((Node) node).getParent();
45         }
46
47         if (element != null) {
48             return new DefaultNamespaceContext(element);
49         }
50
51         return null;
52     }
53
54     public String JavaDoc translateNamespacePrefixToUri(String JavaDoc prefix) {
55         if ((prefix != null) && (prefix.length() > 0)) {
56             Namespace ns = element.getNamespaceForPrefix(prefix);
57
58             if (ns != null) {
59                 return ns.getURI();
60             }
61         }
62
63         return null;
64     }
65 }
66
67 /*
68  * Redistribution and use of this software and associated documentation
69  * ("Software"), with or without modification, are permitted provided that the
70  * following conditions are met:
71  *
72  * 1. Redistributions of source code must retain copyright statements and
73  * notices. Redistributions must also contain a copy of this document.
74  *
75  * 2. Redistributions in binary form must reproduce the above copyright notice,
76  * this list of conditions and the following disclaimer in the documentation
77  * and/or other materials provided with the distribution.
78  *
79  * 3. The name "DOM4J" must not be used to endorse or promote products derived
80  * from this Software without prior written permission of MetaStuff, Ltd. For
81  * written permission, please contact dom4j-info@metastuff.com.
82  *
83  * 4. Products derived from this Software may not be called "DOM4J" nor may
84  * "DOM4J" appear in their names without prior written permission of MetaStuff,
85  * Ltd. DOM4J is a registered trademark of MetaStuff, Ltd.
86  *
87  * 5. Due credit should be given to the DOM4J Project - http://www.dom4j.org
88  *
89  * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS ``AS IS'' AND
90  * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
91  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
92  * ARE DISCLAIMED. IN NO EVENT SHALL METASTUFF, LTD. OR ITS CONTRIBUTORS BE
93  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
94  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
95  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
96  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
97  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
98  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
99  * POSSIBILITY OF SUCH DAMAGE.
100  *
101  * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
102  */
103
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