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;
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 {
29 private final Element element;
30
31 public DefaultNamespaceContext(Element element) {
32 this.element = element;
33 }
34
35 public static DefaultNamespaceContext create(Object 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 translateNamespacePrefixToUri(String 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 */