Summary

A type conversion statement. This keyword is used in any expression.

Syntax

expression as type ;

Description

The as statement attempts to convert the type of the expression into the requested type, without raising a ClassCastException. If it can convert, the as statement returns an expression with the correct type. It returns null if the conversion failed.

Example

rule AsStatement {
   when {
      ?a: Alarm(?e : equipment);
   } 
   then {
      Multiplex m = ?e as Multiplex;
      if (m != null);
         System.out.println("Alarm occurs on Multiplex");
   }
};

See Also