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1   /*
2    * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/expr/DefaultAbsoluteLocationPath.java,v 1.15 2005/09/06 13:41:01 elharo Exp $
3    * $Revision: 1.15 $
4    * $Date: 2005/09/06 13:41:01 $
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: DefaultAbsoluteLocationPath.java,v 1.15 2005/09/06 13:41:01 elharo Exp $
60   */
61  package org.jaxen.expr;
62  
63  import java.util.Collections;
64  import java.util.List;
65  
66  import org.jaxen.Context;
67  import org.jaxen.ContextSupport;
68  import org.jaxen.JaxenException;
69  import org.jaxen.Navigator;
70  import org.jaxen.util.SingletonList;
71  
72  /***
73   * @deprecated this class will become non-public in the future;
74   *     use the interface instead
75   */
76  public class DefaultAbsoluteLocationPath extends DefaultLocationPath 
77  {
78      public DefaultAbsoluteLocationPath()
79      {
80      }
81  
82      public String toString()
83      {
84          return "[(DefaultAbsoluteLocationPath): " + super.toString() + "]";
85      }
86  
87      public boolean isAbsolute() 
88      {
89          return true;
90      }
91  
92      public String getText()
93      {
94          return "/" + super.getText();
95      }
96  
97      public Object evaluate(Context context) throws JaxenException
98      {
99          ContextSupport support = context.getContextSupport();
100         Navigator      nav     = support.getNavigator();
101         Context absContext = new Context( support );
102         List contextNodes = context.getNodeSet();
103 
104         if ( contextNodes.isEmpty() )
105         {
106             return Collections.EMPTY_LIST;
107         }
108 
109         Object firstNode = contextNodes.get( 0 );
110         Object docNode   = nav.getDocumentNode( firstNode );
111 
112         if ( docNode == null )
113         {
114             return Collections.EMPTY_LIST;
115         }
116 
117         List list = new SingletonList(docNode);
118 
119         absContext.setNodeSet( list );
120 
121         return super.evaluate( absContext );
122     }
123 
124     public void accept(Visitor visitor)
125     {
126         visitor.visit(this);
127     }
128 }
129