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Java > Open Source Codes > org > jaxen > expr > DefaultVariableReferenceExpr


1 /*
2  * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/expr/DefaultVariableReferenceExpr.java,v 1.9 2005/05/16 10:49:42 elharo Exp $
3  * $Revision: 1.9 $
4  * $Date: 2005/05/16 10:49:42 $
5  *
6  * ====================================================================
7  *
8  * Copyright (C) 2000-2002 bob mcwhirter & James Strachan.
9  * All rights reserved.
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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.
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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
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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,
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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: DefaultVariableReferenceExpr.java,v 1.9 2005/05/16 10:49:42 elharo Exp $
60  */
61
62
63
64 package org.jaxen.expr;
65
66 import org.jaxen.Context;
67 import org.jaxen.UnresolvableException;
68
69 class DefaultVariableReferenceExpr extends DefaultExpr implements VariableReferenceExpr
70 {
71     private String JavaDoc prefix;
72     private String JavaDoc variableName;
73
74     DefaultVariableReferenceExpr(String JavaDoc prefix,
75                                         String JavaDoc variableName)
76     {
77         this.prefix = prefix;
78         this.variableName = variableName;
79     }
80
81     public String JavaDoc getPrefix()
82     {
83         return this.prefix;
84     }
85
86     public String JavaDoc getVariableName()
87     {
88         return this.variableName;
89     }
90
91     public String JavaDoc toString()
92     {
93         String JavaDoc prefix = getPrefix();
94
95         if ( prefix == null )
96         {
97             return "[(DefaultVariableReferenceExpr): " + getVariableName() + "]";
98         }
99
100         return "[(DefaultVariableReferenceExpr): " + getPrefix() + ":" + getVariableName() + "]";
101     }
102
103     public String JavaDoc getText()
104     {
105         String JavaDoc prefix = getPrefix();
106
107         if ( prefix == null )
108         {
109             return "$" + getVariableName();
110         }
111
112         return "$" + prefix + ":" + getVariableName();
113     }
114
115     public Object JavaDoc evaluate(Context context)
116         throws UnresolvableException
117     {
118         String JavaDoc namespaceURI =
119             context.translateNamespacePrefixToUri( getPrefix() );
120
121         return context.getVariableValue( namespaceURI,
122                                          getPrefix(),
123                                          getVariableName() );
124     }
125     
126     public void accept(Visitor visitor)
127     {
128         visitor.visit(this);
129     }
130 }
131
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