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Java > Open Source Codes > freemarker > core > EscapeBlock


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,
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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
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 java.io.IOException JavaDoc;
56 import freemarker.template.*;
57
58 /**
59  * Representation of the compile-time Escape directive.
60  * @version $Id: EscapeBlock.java,v 1.1 2003/04/22 21:05:01 revusky Exp $
61  * @author Attila Szegedi
62  */
63 class EscapeBlock extends TemplateElement {
64
65     private final String JavaDoc variable;
66     private final Expression expr;
67     private Expression escapedExpr;
68
69
70     EscapeBlock(String JavaDoc variable, Expression expr, Expression escapedExpr) {
71         this.variable = variable;
72         this.expr = expr;
73         this.escapedExpr = escapedExpr;
74     }
75
76     void setContent(TemplateElement nestedBlock) {
77         this.nestedBlock = nestedBlock;
78         // We don't need it anymore at this point
79 this.escapedExpr = null;
80     }
81
82     void accept(Environment env) throws TemplateException, IOException JavaDoc {
83         if (nestedBlock != null) {
84             env.visit(nestedBlock);
85         }
86     }
87
88     Expression doEscape(Expression subst) {
89         return escapedExpr.deepClone(variable, subst);
90     }
91
92     public String JavaDoc getDescription() {
93         return "escape " + variable + " as " + expr.toString();
94     }
95
96     public String JavaDoc getCanonicalForm() {
97         return "<#escape "
98             + variable
99             + " as "
100             + expr.getCanonicalForm()
101             + ">"
102             + nestedBlock.getCanonicalForm()
103             + "</#escape>";
104     }
105 }
106
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