/**

   A negated boolean expression has a reference
   to a boolean expression, but returns the opposite of its value
   and sticks an ! in front of it with parens.
   
*/

public class NegatedBooleanExpression extends BooleanExpression {

    private BooleanExpression be;

    public NegatedBoolean (BooleanExpression be) {
	this.be = be;
    }

    public boolean getValue() {
	return !be.getValue();
    }

    /**
       
     */
    public String toString() {
	return "!(" + be.toString() + ")";
    }

}