/**
 * Exclusive or.
 *
 * @version 1.1   September 27, 2001
 * @author Franck van Breugel
 * @see Expression
 */
public class Xor extends Expression
{
    private Expression left;
    private Expression right;

    /**
     * Exclusive or.
     *
     * @param left first operand.
     * @param right second operand.
     */
    public Xor(Expression left, Expression right)
    {
       this.left = left;
       this.right = right;
    }

    /**
     * Return a string representation.
     */
    public String toString()
    {
        return left.toString() + " xor " + right.toString();
    }

    /**
     * Accessor method for left.
     */
    public Expression getLeft()
    {
        return left;
    }

    /**
     * Accessor method for right.
     */
    public Expression getRight()
    {
        return right;
    }
}