01: /*
02: * Copyright (c) 2003 The Visigoth Software Society. All rights
03: * reserved.
04: *
05: * Redistribution and use in source and binary forms, with or without
06: * modification, are permitted provided that the following conditions
07: * are met:
08: *
09: * 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 key;
66:
67: Dot(Expression target, String key) {
68: this .target = target;
69: this .key = key;
70: }
71:
72: TemplateModel _getAsTemplateModel(Environment env)
73: throws TemplateException {
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 getCanonicalForm() {
82: return target.getCanonicalForm() + "." + key;
83: }
84:
85: boolean isLiteral() {
86: return target.isLiteral();
87: }
88:
89: Expression _deepClone(String name, Expression subst) {
90: return new Dot(target.deepClone(name, subst), key);
91: }
92:
93: boolean onlyHasIdentifiers() {
94: return (target instanceof Identifier)
95: || ((target instanceof Dot) && ((Dot) target)
96: .onlyHasIdentifiers());
97: }
98: }
|