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 java.io.IOException;
56 import freemarker.template;
57
58 /**
59 * An element that represents a conditionally executed block.
60 * @author <A HREF="mailto:jon@revusky.com">Jonathan Revusky</A>
61 */
62
63 final class ConditionalBlock extends TemplateElement {
64
65 final Expression condition;
66 private final boolean isFirst;
67 boolean isSimple;
68
69 ConditionalBlock(Expression condition, TemplateElement nestedBlock, boolean isFirst)
70 {
71 this.condition = condition;
72 this.nestedBlock = nestedBlock;
73 this.isFirst = isFirst;
74 }
75
76 void accept(Environment env) throws TemplateException, IOException {
77 if (condition == null || condition.isTrue(env)) {
78 if (nestedBlock != null) {
79 env.visit(nestedBlock);
80 }
81 }
82 }
83
84 public String getCanonicalForm() {
85 StringBuffer buf = new StringBuffer();
86 if (condition == null) {
87 buf.append("<#else");
88 }
89 else if (isFirst) {
90 buf.append("<#if ");
91 }
92 else {
93 buf.append("<#elseif ");
94 }
95 if (condition != null) {
96 buf.append(condition.getCanonicalForm());
97 }
98 buf.append(">");
99 if (nestedBlock != null) {
100 buf.append(nestedBlock.getCanonicalForm());
101 }
102 if (isSimple) {
103 buf.append("</#if>");
104 }
105 return buf.toString();
106 }
107
108 public String getDescription() {
109 String s = "if ";
110 if (condition == null) {
111 s = "else ";
112 }
113 else if (!isFirst) {
114 s = "elseif ";
115 }
116 String cond = condition != null ? condition.toString() : "";
117 return s + cond;
118 }
119 }
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