|
1
52
53 package freemarker.core;
54
55 import java.io.IOException  ;
56 import freemarker.template.*;
57
58
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 }
120 |
Popular Tags |
Java API By Example, From Geeks To Geeks.