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1   /*
2    * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/pattern/NamespaceTest.java,v 1.6 2006/02/05 21:47:42 elharo Exp $
3    * $Revision: 1.6 $
4    * $Date: 2006/02/05 21:47:42 $
5    *
6    * ====================================================================
7    *
8    * Copyright 2000-2002 bob mcwhirter & James Strachan.
9    * All rights reserved.
10   *
11   * Redistribution and use in source and binary forms, with or without
12   * modification, are permitted provided that the following conditions are
13   * met:
14   * 
15   *   * Redistributions of source code must retain the above copyright
16   *     notice, this list of conditions and the following disclaimer.
17   * 
18   *   * Redistributions in binary form must reproduce the above copyright
19   *     notice, this list of conditions and the following disclaimer in the
20   *     documentation and/or other materials provided with the distribution.
21   * 
22   *   * Neither the name of the Jaxen Project nor the names of its
23   *     contributors may be used to endorse or promote products derived 
24   *     from this software without specific prior written permission.
25   * 
26   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
27   * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28   * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
29   * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
30   * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
31   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
32   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
33   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
34   * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
35   * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
36   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37   *
38   * ====================================================================
39   * This software consists of voluntary contributions made by many 
40   * individuals on behalf of the Jaxen Project and was originally 
41   * created by bob mcwhirter <bob@werken.com> and 
42   * James Strachan <jstrachan@apache.org>.  For more information on the 
43   * Jaxen Project, please see <http://www.jaxen.org/>.
44   * 
45   * $Id: NamespaceTest.java,v 1.6 2006/02/05 21:47:42 elharo Exp $
46   */
47  
48  package org.jaxen.pattern;
49  
50  import org.jaxen.Context;
51  import org.jaxen.Navigator;
52  
53  /*** <p><code>NamespaceTest</code> tests for a given namespace URI.</p>
54    *
55    * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
56    * @version $Revision: 1.6 $
57    */
58  public class NamespaceTest extends NodeTest {
59      
60      /*** The prefix to match against */
61      private String prefix;
62      
63      /*** The type of node to match - either attribute or element */
64      private short nodeType;
65      
66      public NamespaceTest(String prefix, short nodeType)   
67      {
68          if ( prefix == null ) 
69          {
70              prefix = "";
71          }
72          this.prefix = prefix;
73          this.nodeType = nodeType;
74      }
75          
76      /*** @return true if the pattern matches the given node
77        */
78      public boolean matches( Object node, Context context ) 
79      {
80          Navigator navigator = context.getNavigator();
81          String uri = getURI( node, context );
82          
83          if ( nodeType == Pattern.ELEMENT_NODE ) 
84          {
85              return navigator.isElement( node ) 
86                  && uri.equals( navigator.getElementNamespaceUri( node ) );
87          }
88          else if ( nodeType == Pattern.ATTRIBUTE_NODE ) 
89          {
90              return navigator.isAttribute( node )
91                  && uri.equals( navigator.getAttributeNamespaceUri( node ) );
92          }
93          return false;
94      }
95      
96      public double getPriority() 
97      {
98          return -0.25;
99      }
100 
101 
102     public short getMatchType() 
103     {
104         return nodeType;
105     }
106     
107     public String getText() 
108     {
109         return prefix + ":";
110     }
111     
112     public String toString()
113     {
114         return super.toString() + "[ prefix: " + prefix + " type: " + nodeType + " ]";
115     }
116     
117     /*** Returns the URI of the current prefix or "" if no URI can be found
118      */
119     protected String getURI(Object node, Context context)
120     {
121         String uri = context.getNavigator().translateNamespacePrefixToUri( prefix, node );
122         if ( uri == null )
123         {
124             uri = context.getContextSupport().translateNamespacePrefixToUri( prefix );
125         }
126         if ( uri == null ) 
127         {
128             uri = "";
129         }
130         return uri;
131     }
132 }