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


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 public final class NullLiteral extends LiteralExpression {
14   /*
15    * @see jfun.parsec.mssql.Expression#acceptVisitor(jfun.parsec.mssql.ExpressionVisitor)
16    */
17   public void acceptVisitor(ExpressionVisitor v) {
18     v.visitNull();
19   }
20
21   private NullLiteral() {}
22   private static final Expression singleton = new NullLiteral();
23   public static Expression instance(){return singleton;}
24   public String JavaDoc toString(){return "null";}
25 }
26
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