public void execute(Handler handler) {
int operand1;
int operand2;
int result;
operand2 = ((Integer) handler.pop()).intValue();
operand1 = ((Integer) handler.pop()).intValue();
if (operand2 > 0) {
result = operand1 << operand2;
} else {
result = operand1 >> -operand2;
}
handler.push(new Integer(result));
}
@Override
public void execute(Handler handler) throws ParseException {
Object o2 = handler.pop();
Object o1 = handler.pop();
if (o1 instanceof Number && o2 instanceof Number) {
handler.push(((Number) o1).doubleValue() <= ((Number) o2).doubleValue());
return;
}
if (o1 instanceof String && o2 instanceof String) {
handler.push(((String) o1).compareTo((String) o2) <= 0);
return;
}
throw new ParseException("operandes to not comparable");
}
@Override
public void execute(Handler handler) {
Object o1 = handler.pop();
Object o2 = handler.pop();
handler.push(o1.equals(o2));
}