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Java > Open Source Codes > freemarker > core > Range


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
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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.
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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.
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.
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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.
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33  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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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 freemarker.template.*;
56
57 /**
58  * A class that represents a Range between two integers.
59  */
60 final class Range extends Expression {
61
62     final Expression left;
63     final Expression right;
64
65     Range(Expression left, Expression right) {
66         this.left = left;
67         this.right = right;
68     }
69     
70     boolean hasRhs() {
71         return right != null;
72     }
73
74     TemplateModel _getAsTemplateModel(Environment env)
75         throws TemplateException
76     {
77         int min = EvaluationUtil.getNumber(left, env).intValue();
78         int max = 0;
79         if (right != null) {
80             max = EvaluationUtil.getNumber(right, env).intValue();
81             return new NumericalRange(min, max);
82         }
83         return new NumericalRange(min);
84     }
85     
86     boolean isTrue(Environment env) throws TemplateException {
87         String JavaDoc msg = "Error " + getStartLocation() + ". "
88                     + "\nExpecting a boolean here."
89                     + " Expression " + this + " is a range.";
90         throw new NonBooleanException(msg, env);
91     }
92
93     public String JavaDoc getCanonicalForm() {
94         String JavaDoc rhs = right != null ? right.getCanonicalForm() : "";
95         return left.getCanonicalForm() + ".." + rhs;
96     }
97     
98     boolean isLiteral() {
99         boolean rightIsLiteral = right == null || right.isLiteral();
100         return constantValue != null || (left.isLiteral() && rightIsLiteral);
101     }
102     
103     Expression _deepClone(String JavaDoc name, Expression subst) {
104         return new Range(left.deepClone(name, subst), right.deepClone(name, subst));
105     }
106 }
107
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