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Java > Open Source Codes > freemarker > core > Dot


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
36  * DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
37  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
38  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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
43  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
44  * SUCH DAMAGE.
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 freemarker.template.TemplateException;
56 import freemarker.template.TemplateHashModel;
57 import freemarker.template.TemplateModel;
58
59 /**
60  * The dot operator. Used to reference items inside a
61  * <code>TemplateHashModel</code>.
62  */
63 final class Dot extends Expression {
64     private final Expression target;
65     private final String JavaDoc key;
66
67     Dot(Expression target, String JavaDoc key) {
68         this.target = target;
69         this.key = key;
70     }
71
72     TemplateModel _getAsTemplateModel(Environment env) throws TemplateException
73     {
74         TemplateModel leftModel = target.getAsTemplateModel(env);
75         if(leftModel instanceof TemplateHashModel) {
76             return ((TemplateHashModel) leftModel).get(key);
77         }
78         throw invalidTypeException(leftModel, target, env, "hash");
79     }
80
81     public String JavaDoc getCanonicalForm() {
82         return target.getCanonicalForm() + "." + key;
83     }
84     
85     boolean isLiteral() {
86         return target.isLiteral();
87     }
88
89     Expression _deepClone(String JavaDoc name, Expression subst) {
90         return new Dot(target.deepClone(name, subst), key);
91     }
92
93     boolean onlyHasIdentifiers() {
94         return (target instanceof Identifier) || ((target instanceof Dot) && ((Dot) target).onlyHasIdentifiers());
95     }
96 }
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