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Java > Open Source Codes > tests > jfun > parsec > mssql > ExpressionCaseWhen


1 /*
2  * Created on 2004-11-15
3  *
4  * Author Ben Yu
5  */
6 package tests.jfun.parsec.mssql;
7
8 /**
9  * @author Ben Yu
10  *
11  * 2004-11-15
12  */
13 final class ExpressionCaseWhen implements Expression {
14
15   /*
16    * @see jfun.parsec.mssql.Expression#getPrecedence()
17    */
18   public int getPrecedence() {
19     return Precedences.case_stmt();
20   }
21
22   /*
23    * @see jfun.parsec.mssql.Expression#acceptVisitor(jfun.parsec.mssql.ExpressionVisitor)
24    */
25   public void acceptVisitor(ExpressionVisitor v) {
26     v.visitCaseWhen(cases, def);
27   }
28   public boolean hasDefault(){
29     return def != null;
30   }
31   private final BoolWhenThen[] cases;
32   private final Expression def;
33   
34   /**
35    * @param cases
36    * @param def
37    */
38   ExpressionCaseWhen(final BoolWhenThen[] cases, final Expression def) {
39     this.cases = cases;
40     this.def = def;
41   }
42   static Expression nodef(final BoolWhenThen[] cases){
43     return new ExpressionCaseWhen(cases, null);
44   }
45   static Expression def(final BoolWhenThen[] cases, Expression def){
46     return new ExpressionCaseWhen(cases, def);
47   }
48   public String JavaDoc toString(){
49     final StringBuffer JavaDoc buf = new StringBuffer JavaDoc("case");
50     for(int i=0; i<cases.length; i++){
51       final BoolWhenThen bwt = cases[i];
52       buf.append(" when ").append(bwt.getWhen()).append(" then ").append(bwt.getThen());
53     }
54     if(def != null)
55       buf.append(" else ").append(def);
56     buf.append(" end");
57     return buf.toString();
58   }
59 }
60
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