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Java > Open Source Codes > freemarker > core > DollarVariable


1 /*
2  * Copyright (c) 2003 The Visigoth Software Society. All rights
3  * reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  *
9  * 1. Redistributions of source code must retain the above copyright
10  * notice, this list of conditions and the following disclaimer.
11  *
12  * 2. Redistributions in binary form must reproduce the above copyright
13  * notice, this list of conditions and the following disclaimer in
14  * the documentation and/or other materials provided with the
15  * distribution.
16  *
17  * 3. The end-user documentation included with the redistribution, if
18  * any, must include the following acknowledgement:
19  * "This product includes software developed by the
20  * Visigoth Software Society (http://www.visigoths.org/)."
21  * Alternately, this acknowledgement may appear in the software itself,
22  * if and wherever such third-party acknowledgements normally appear.
23  *
24  * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
25  * project contributors may be used to endorse or promote products derived
26  * from this software without prior written permission. For written
27  * permission, please contact visigoths@visigoths.org.
28  *
29  * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
30  * nor may "FreeMarker" or "Visigoth" appear in their names
31  * without prior written permission of the Visigoth Software Society.
32  *
33  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
34  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
35  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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39  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
40  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
41  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
42  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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45  * ====================================================================
46  *
47  * This software consists of voluntary contributions made by many
48  * individuals on behalf of the Visigoth Software Society. For more
49  * information on the Visigoth Software Society, please see
50  * http://www.visigoths.org/
51  */
52
53 package freemarker.core;
54
55 import java.io.IOException JavaDoc;
56
57 import freemarker.template.TemplateException;
58
59 /**
60  * An instruction that outputs the value of an <tt>Expression</tt>.
61  */
62 final class DollarVariable extends TemplateElement {
63
64     private final Expression expression;
65     private final Expression escapedExpression;
66
67     DollarVariable(Expression expression, Expression escapedExpression) {
68         this.expression = expression;
69         this.escapedExpression = escapedExpression;
70     }
71
72     /**
73      * Outputs the string value of the enclosed expression.
74      */
75     void accept(Environment env) throws TemplateException, IOException JavaDoc {
76         env.getOut().write(escapedExpression.getStringValue(env));
77     }
78
79     public String JavaDoc getCanonicalForm() {
80         return "${" + expression.getCanonicalForm() + "}";
81     }
82
83     public String JavaDoc getDescription() {
84         return this.getSource() +
85         (expression == escapedExpression
86             ? ""
87             : " escaped ${" + escapedExpression.getCanonicalForm() + "}");
88     }
89
90     boolean heedsOpeningWhitespace() {
91         return true;
92     }
93
94     boolean heedsTrailingWhitespace() {
95         return true;
96     }
97 }
98
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