1 /*
2 * $Header: /home/cvs/jakarta-commons/betwixt/src/java/org/apache/commons/betwixt/expression/VariableExpression.java,v 1.2 2002/07/01 18:58:53 rdonkin Exp $
3 * $Revision: 1.2 $
4 * $Date: 2002/07/01 18:58:53 $
5 *
6 * ====================================================================
7 *
8 * The Apache Software License, Version 1.1
9 *
10 * Copyright (c) 1999-2002 The Apache Software Foundation. All rights
11 * reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 *
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 *
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in
22 * the documentation and/or other materials provided with the
23 * distribution.
24 *
25 * 3. The end-user documentation included with the redistribution, if
26 * any, must include the following acknowlegement:
27 * "This product includes software developed by the
28 * Apache Software Foundation (http://www.apache.org/)."
29 * Alternately, this acknowlegement may appear in the software itself,
30 * if and wherever such third-party acknowlegements normally appear.
31 *
32 * 4. The names "The Jakarta Project", "Commons", and "Apache Software
33 * Foundation" must not be used to endorse or promote products derived
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35 * permission, please contact apache@apache.org.
36 *
37 * 5. Products derived from this software may not be called "Apache"
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40 *
41 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
42 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
43 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
44 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
45 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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47 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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53 * ====================================================================
54 *
55 * This software consists of voluntary contributions made by many
56 * individuals on behalf of the Apache Software Foundation. For more
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58 * <http://www.apache.org/>;.
59 *
60 * $Id: VariableExpression.java,v 1.2 2002/07/01 18:58:53 rdonkin Exp $
61 */
62 package org.apache.commons.betwixt.expression;
63
64 /*** <p><code>VariableExpression</code> represents a variable expression such as
65 * <code>$foo</code> which returns the value of the given variable.</p>
66 *
67 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
68 * @version $Revision: 1.2 $
69 */
70 public class VariableExpression implements Expression {
71
72 /*** The variable name */
73 private String variableName;
74
75 /*** Base constructor */
76 public VariableExpression() {
77 }
78
79 /*** Convenience constructor sets <code>VariableName</code> property */
80 public VariableExpression(String variableName) {
81 this.variableName = variableName;
82 }
83
84 /*** Return the value of a context variable.
85 *
86 * @param context evaluate against this context
87 * @return the value of the context variable named by the <code>VariableName</code> property
88 */
89 public Object evaluate(Context context) {
90 return context.getVariable( variableName );
91 }
92
93 /*** Gets the variable name */
94 public String getVariableName() {
95 return variableName;
96 }
97
98 /*** Sets the variable name */
99 public void setVariableName(String variableName) {
100 this.variableName = variableName;
101 }
102
103 public void update(Context context, String newValue) {
104 // do nothing
105 }
106
107 public String toString() {
108 return "VariableExpression [variable name=" + variableName + "]";
109 }
110 }
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