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1
52
53 package freemarker.core;
54
55 import java.util.ArrayList  ;
56 import java.io.IOException ;
57 import freemarker.template.TemplateException;
58
59
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 }
117 |
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