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1   /*
2    * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/expr/DefaultAbsoluteLocationPath.java,v 1.18 2006/11/30 18:49:27 elharo Exp $
3    * $Revision: 1.18 $
4    * $Date: 2006/11/30 18:49:27 $
5    *
6    * ====================================================================
7    *
8    * Copyright 2000-2002 bob mcwhirter & James Strachan.
9    * All rights reserved.
10   *
11   *
12   * Redistribution and use in source and binary forms, with or without
13   * modification, are permitted provided that the following conditions are
14   * met:
15   * 
16   *   * Redistributions of source code must retain the above copyright
17   *     notice, this list of conditions and the following disclaimer.
18   * 
19   *   * Redistributions in binary form must reproduce the above copyright
20   *     notice, this list of conditions and the following disclaimer in the
21   *     documentation and/or other materials provided with the distribution.
22   * 
23   *   * Neither the name of the Jaxen Project nor the names of its
24   *     contributors may be used to endorse or promote products derived 
25   *     from this software without specific prior written permission.
26   * 
27   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
28   * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29   * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
30   * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
31   * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
32   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
33   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
34   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
35   * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
36   * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
37   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38   *
39   * ====================================================================
40   * This software consists of voluntary contributions made by many
41   * individuals on behalf of the Jaxen Project and was originally
42   * created by bob mcwhirter <bob@werken.com> and
43   * James Strachan <jstrachan@apache.org>.  For more information on the
44   * Jaxen Project, please see <http://www.jaxen.org/>.
45   *
46   * $Id: DefaultAbsoluteLocationPath.java,v 1.18 2006/11/30 18:49:27 elharo Exp $
47   */
48  package org.jaxen.expr;
49  
50  import java.util.Collections;
51  import java.util.List;
52  
53  import org.jaxen.Context;
54  import org.jaxen.ContextSupport;
55  import org.jaxen.JaxenException;
56  import org.jaxen.Navigator;
57  import org.jaxen.util.SingletonList;
58  
59  /***
60   * @deprecated this class will become non-public in the future;
61   *     use the interface instead
62   */
63  public class DefaultAbsoluteLocationPath extends DefaultLocationPath 
64  {
65      /***
66       * 
67       */
68      private static final long serialVersionUID = 2174836928310146874L;
69  
70      public DefaultAbsoluteLocationPath()
71      {
72      }
73  
74      public String toString()
75      {
76          return "[(DefaultAbsoluteLocationPath): " + super.toString() + "]";
77      }
78  
79      public boolean isAbsolute() 
80      {
81          return true;
82      }
83  
84      public String getText()
85      {
86          return "/" + super.getText();
87      }
88  
89      public Object evaluate(Context context) throws JaxenException
90      {
91          ContextSupport support = context.getContextSupport();
92          Navigator      nav     = support.getNavigator();
93          Context absContext = new Context( support );
94          List contextNodes = context.getNodeSet();
95  
96          if ( contextNodes.isEmpty() )
97          {
98              return Collections.EMPTY_LIST;
99          }
100 
101         Object firstNode = contextNodes.get( 0 );
102         Object docNode   = nav.getDocumentNode( firstNode );
103 
104         if ( docNode == null )
105         {
106             return Collections.EMPTY_LIST;
107         }
108 
109         List list = new SingletonList(docNode);
110 
111         absContext.setNodeSet( list );
112 
113         return super.evaluate( absContext );
114     }
115 
116 }
117