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1   /*
2    * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/expr/DefaultAbsoluteLocationPath.java,v 1.13 2005/03/01 01:49:59 proyal Exp $
3    * $Revision: 1.13 $
4    * $Date: 2005/03/01 01:49:59 $
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 1.13 2005/03/01 01:49:59 proyal 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  public class DefaultAbsoluteLocationPath extends DefaultLocationPath 
73  {
74      public DefaultAbsoluteLocationPath()
75      {
76      }
77  
78      public String toString()
79      {
80          return "[(DefaultAbsoluteLocationPath): " + super.toString() + "]";
81      }
82  
83      public boolean isAbsolute() 
84      {
85          return true;
86      }
87  
88      public String getText()
89      {
90          return "/" + super.getText();
91      }
92  
93      public Object evaluate(Context context) throws JaxenException
94      {
95          ContextSupport support = context.getContextSupport();
96          Navigator      nav     = support.getNavigator();
97          Context absContext = new Context( support );
98          List contextNodes = context.getNodeSet();
99  
100         if ( contextNodes.isEmpty() )
101         {
102             return Collections.EMPTY_LIST;
103         }
104 
105         Object firstNode = contextNodes.get( 0 );
106         Object docNode   = nav.getDocumentNode( firstNode );
107 
108         if ( docNode == null )
109         {
110             return Collections.EMPTY_LIST;
111         }
112 
113         List list = new SingletonList(docNode);
114 
115         absContext.setNodeSet( list );
116 
117         return super.evaluate( absContext );
118     }
119 
120     public void accept(Visitor visitor)
121     {
122         visitor.visit(this);
123     }
124 }
125