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Java > Open Source Codes > freemarker > core > NotExpression


1 /*
2  * Copyright (c) 2003 The Visigoth Software Society. All rights
3  * reserved.
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5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
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10  * notice, this list of conditions and the following disclaimer.
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12  * 2. Redistributions in binary form must reproduce the above copyright
13  * notice, this list of conditions and the following disclaimer in
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15  * distribution.
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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.
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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
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27  * permission, please contact visigoths@visigoths.org.
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30  * nor may "FreeMarker" or "Visigoth" appear in their names
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51  */
52
53 package freemarker.core;
54
55 import freemarker.template.TemplateException;
56
57 final class NotExpression extends BooleanExpression {
58
59     private final Expression target;
60
61     NotExpression(Expression target) {
62         this.target = target;
63     }
64
65     boolean isTrue(Environment env) throws TemplateException {
66         return (!target.isTrue(env));
67     }
68
69     public String JavaDoc getCanonicalForm() {
70         return "!" + target.getCanonicalForm();
71     }
72     
73     boolean isLiteral() {
74         return target.isLiteral();
75     }
76
77     Expression _deepClone(String JavaDoc name, Expression subst) {
78         return new NotExpression(target.deepClone(name, subst));
79     }
80 }
81
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