1 /*
2  * $Header: /cvsroot/jaxen/jaxen/src/java/main/org/jaxen/expr/DefaultAbsoluteLocationPath.java,v 1.8 2002/04/26 17:17:34 jstrachan Exp $
3  * $Revision: 1.8 $
4  * $Date: 2002/04/26 17:17:34 $
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 1.8 2002/04/26 17:17:34 jstrachan Exp $
60  */
61 
62 
63 
64 package org.jaxen.expr;
65 
66 import org.jaxen.Context;
67 import org.jaxen.ContextSupport;
68 import org.jaxen.Navigator;
69 import org.jaxen.JaxenException;
70 
71 import java.util.List;
72 import java.util.ArrayList;
73 import java.util.Collections;
74 
75 public class DefaultAbsoluteLocationPath extends DefaultLocationPath
76 {
DefaultAbsoluteLocationPath()77     public DefaultAbsoluteLocationPath()
78     {
79     }
80 
toString()81     public String toString()
82     {
83         return "[(DefaultAbsoluteLocationPath): " + super.toString() + "]";
84     }
85 
isAbsolute()86     public boolean isAbsolute()
87     {
88         return true;
89     }
90 
getText()91     public String getText()
92     {
93         return "/" + super.getText();
94     }
95 
evaluate(Context context)96     public Object evaluate(Context context) throws JaxenException
97     {
98         ContextSupport support = context.getContextSupport();
99         Navigator      nav     = support.getNavigator();
100 
101         Context absContext = new Context( support );
102 
103 
104         List contextNodes = context.getNodeSet();
105 
106         if ( contextNodes.isEmpty() )
107         {
108             return Collections.EMPTY_LIST;
109         }
110 
111         Object firstNode = contextNodes.get( 0 );
112 
113         Object docNode   = nav.getDocumentNode( firstNode );
114 
115         if ( docNode == null )
116         {
117             return Collections.EMPTY_LIST;
118         }
119 
120         List list = new ArrayList(1);
121 
122         list.add( docNode );
123 
124         absContext.setNodeSet( list );
125 
126         return super.evaluate( absContext );
127     }
128 }
129