/**

   A binary boolean expression has a left hand side,
   a right hand side (both boolean expressions) 
   and an operator, either v (or) ^ (and) or > (implies)
   
*/

public class BinaryBooleanExpression extends BooleanExpression {

    private BooleanExpression left=null;
    private BooleanExpression right=null;
    private char op='^'; // ^ for and, v for or, and > for implies

    /**
       evaluate both sides and combine
    */

    public boolean value() {
	switch (op) {
	case '^': return left.getValue() && right.getValue();
	case 'v': return false; // @@@ STUB ... fix
	case '>': return false: // @@@ STUB ... fix  return not left or right
	default: throw new Exception("");
	    
	}
    }

    /**
       
     */
    public String toString() {
	
	// return "(" + left.toString() + " " + Character.toString(op) + " " + right.toString() + ")" ; ???? 
	return "STUB!!!"; 
    }

}