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1   /*
2    * Copyright 2001-2004 (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    * $Id: DefaultNamespaceContext.java,v 1.7 2004/06/25 08:03:42 maartenc Exp $
8    */
9   
10  package org.dom4j.xpath;
11  
12  import java.io.Serializable;
13  
14  import org.dom4j.Document;
15  import org.dom4j.Element;
16  import org.dom4j.Namespace;
17  import org.dom4j.Node;
18  import org.jaxen.NamespaceContext;
19  
20  
21  /*** <p><code>DefaultNamespaceContext</code> implements a Jaxen 
22    * NamespaceContext such that a context node is used
23    * to determine the current XPath namespace prefixes and namespace URIs 
24    * available.</p>
25    *
26    * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
27    */
28  public class DefaultNamespaceContext implements NamespaceContext, Serializable {
29  
30      private final Element element;
31      
32      public DefaultNamespaceContext(Element element) {
33          this.element = element;
34      }
35  
36      public static DefaultNamespaceContext create(Object node) {
37          Element element = null;
38          if ( node instanceof Element ) {
39              element = (Element) node;
40          }
41          else if ( node instanceof Document ) {
42              Document doc = (Document) node;
43              element = doc.getRootElement();
44          }
45          else if ( node instanceof Node ) {
46              element = ((Node) node).getParent();
47          }
48          if (element != null) {
49              return new DefaultNamespaceContext(element);
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              if ( ns != null ) {
58                  return ns.getURI();
59              }
60          }
61          return null;
62      }
63  }
64  
65  
66  
67  
68  /*
69   * Redistribution and use of this software and associated documentation
70   * ("Software"), with or without modification, are permitted provided
71   * that the following conditions are met:
72   *
73   * 1. Redistributions of source code must retain copyright
74   *    statements and notices.  Redistributions must also contain a
75   *    copy of this document.
76   *
77   * 2. Redistributions in binary form must reproduce the
78   *    above copyright notice, this list of conditions and the
79   *    following disclaimer in the documentation and/or other
80   *    materials provided with the distribution.
81   *
82   * 3. The name "DOM4J" must not be used to endorse or promote
83   *    products derived from this Software without prior written
84   *    permission of MetaStuff, Ltd.  For written permission,
85   *    please contact dom4j-info@metastuff.com.
86   *
87   * 4. Products derived from this Software may not be called "DOM4J"
88   *    nor may "DOM4J" appear in their names without prior written
89   *    permission of MetaStuff, Ltd. DOM4J is a registered
90   *    trademark of MetaStuff, Ltd.
91   *
92   * 5. Due credit should be given to the DOM4J Project - 
93   *    http://www.dom4j.org
94   *
95   * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS
96   * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
97   * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
98   * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
99   * METASTUFF, LTD. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
100  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
101  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
102  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
103  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
104  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
105  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
106  * OF THE POSSIBILITY OF SUCH DAMAGE.
107  *
108  * Copyright 2001-2004 (C) MetaStuff, Ltd. All Rights Reserved.
109  *
110  * $Id: DefaultNamespaceContext.java,v 1.7 2004/06/25 08:03:42 maartenc Exp $
111  */