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1   /*
2    * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/pattern/NamespaceTest.java,v 1.4 2002/05/20 08:34:10 jstrachan Exp $
3    * $Revision: 1.4 $
4    * $Date: 2002/05/20 08:34:10 $
5    *
6    * ====================================================================
7    *
8    * Copyright (C) 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
13   * are met:
14   * 
15   * 1. Redistributions of source code must retain the above copyright
16   *    notice, this list of conditions, and the following disclaimer.
17   *
18   * 2. Redistributions in binary form must reproduce the above copyright
19   *    notice, this list of conditions, and the disclaimer that follows 
20   *    these conditions in the documentation and/or other materials 
21   *    provided with the distribution.
22   *
23   * 3. The name "Jaxen" must not be used to endorse or promote products
24   *    derived from this software without prior written permission.  For
25   *    written permission, please contact license@jaxen.org.
26   * 
27   * 4. Products derived from this software may not be called "Jaxen", nor
28   *    may "Jaxen" appear in their name, without prior written permission
29   *    from the Jaxen Project Management (pm@jaxen.org).
30   * 
31   * In addition, we request (but do not require) that you include in the 
32   * end-user documentation provided with the redistribution and/or in the 
33   * software itself an acknowledgement equivalent to the following:
34   *     "This product includes software developed by the
35   *      Jaxen Project (http://www.jaxen.org/)."
36   * Alternatively, the acknowledgment may be graphical using the logos 
37   * available at http://www.jaxen.org/
38   *
39   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
40   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
41   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
42   * DISCLAIMED.  IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT
43   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
45   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
46   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
47   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
48   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
49   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50   * SUCH DAMAGE.
51   *
52   * ====================================================================
53   * This software consists of voluntary contributions made by many 
54   * individuals on behalf of the Jaxen Project and was originally 
55   * created by bob mcwhirter <bob@werken.com> and 
56   * James Strachan <jstrachan@apache.org>.  For more information on the 
57   * Jaxen Project, please see <http://www.jaxen.org/>.
58   * 
59   * $Id: NamespaceTest.java,v 1.4 2002/05/20 08:34:10 jstrachan Exp $
60   */
61  
62  package org.jaxen.pattern;
63  
64  import org.jaxen.Context;
65  import org.jaxen.Navigator;
66  
67  /*** <p><code>NamespaceTest</code> tests for a given namespace URI.</p>
68    *
69    * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
70    * @version $Revision: 1.4 $
71    */
72  public class NamespaceTest extends NodeTest {
73      
74      /*** The prefix to match against */
75      private String prefix;
76      
77      /*** The type of node to match - either attribute or element */
78      private short nodeType;
79      
80      public NamespaceTest(String prefix, short nodeType)   
81      {
82          if ( prefix == null ) 
83          {
84              prefix = "";
85          }
86          this.prefix = prefix;
87          this.nodeType = nodeType;
88      }
89          
90      /*** @return true if the pattern matches the given node
91        */
92      public boolean matches( Object node, Context context ) 
93      {
94          Navigator navigator = context.getNavigator();
95          String uri = getURI( node, context );
96          
97          if ( nodeType == Pattern.ELEMENT_NODE ) 
98          {
99              return navigator.isElement( node ) 
100                 && uri.equals( navigator.getElementNamespaceUri( node ) );
101         }
102         else if ( nodeType == Pattern.ATTRIBUTE_NODE ) 
103         {
104             return navigator.isAttribute( node )
105                 && uri.equals( navigator.getAttributeNamespaceUri( node ) );
106         }
107         return false;
108     }
109     
110     public double getPriority() 
111     {
112         return -0.25;
113     }
114 
115 
116     public short getMatchType() 
117     {
118         return nodeType;
119     }
120     
121     public String getText() 
122     {
123         return prefix + ":";
124     }
125     
126     public String toString()
127     {
128         return super.toString() + "[ prefix: " + prefix + " type: " + nodeType + " ]";
129     }
130     
131     /*** Returns the URI of the current prefix or "" if no URI can be found
132      */
133     protected String getURI(Object node, Context context)
134     {
135         String uri = context.getNavigator().translateNamespacePrefixToUri( prefix, node );
136         if ( uri == null )
137         {
138             uri = context.getContextSupport().translateNamespacePrefixToUri( prefix );
139         }
140         if ( uri == null ) 
141         {
142             uri = "";
143         }
144         return uri;
145     }
146 }