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.util.ArrayList;
56 import java.io.IOException;
57 import freemarker.template.TemplateException;
58
59 /**
60 * A instruction that handles if-elseif-else blocks.
61 * @author <A HREF="mailto:jon@revusky.com">Jonathan Revusky</A>
62 */
63
64 final class IfBlock extends TemplateElement {
65
66 IfBlock(ConditionalBlock block)
67 {
68 nestedElements = new ArrayList();
69 addBlock(block);
70 }
71
72 void addBlock(ConditionalBlock block) {
73 nestedElements.add(block);
74 }
75
76 void accept(Environment env) throws TemplateException, IOException {
77 for (int i = 0; i<nestedElements.size(); i++) {
78 ConditionalBlock cblock = (ConditionalBlock) nestedElements.get(i);
79 Expression condition = cblock.condition;
80 if (condition == null || condition.isTrue(env)) {
81 if (cblock.nestedBlock != null) {
82 env.visit(cblock.nestedBlock);
83 }
84 return;
85 }
86 }
87 }
88
89 public String getCanonicalForm() {
90 StringBuffer buf = new StringBuffer();
91 for (int i = 0; i<nestedElements.size(); i++) {
92 ConditionalBlock cblock = (ConditionalBlock) nestedElements.get(i);
93 buf.append(cblock.getCanonicalForm());
94 }
95 buf.append("</#if>");
96 return buf.toString();
97 }
98
99 TemplateElement postParseCleanup(boolean stripWhitespace)
100 throws ParseException
101 {
102 if (nestedElements.size() == 1) {
103 ConditionalBlock cblock = (ConditionalBlock) nestedElements.get(0);
104 cblock.isSimple = true;
105 cblock.setLocation(getTemplate(), cblock, this);
106 return cblock.postParseCleanup(stripWhitespace);
107 }
108 else {
109 return super.postParseCleanup(stripWhitespace);
110 }
111 }
112
113 public String getDescription() {
114 return "if-else ";
115 }
116 }
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