public static Primitive unaryOperation(Primitive val, int kind) throws UtilEvalError {
if (val == NULL) throw new UtilEvalError("illegal use of null object or 'null' literal");
if (val == VOID) throw new UtilEvalError("illegal use of undefined object or 'void' literal");
Class operandType = val.getType();
Object operand = promoteToInteger(val.getValue());
if (operand instanceof Boolean)
return booleanUnaryOperation((Boolean) operand, kind) ? Primitive.TRUE : Primitive.FALSE;
else if (operand instanceof Integer) {
int result = intUnaryOperation((Integer) operand, kind);
// ++ and -- must be cast back the original type
if (kind == INCR || kind == DECR) {
if (operandType == Byte.TYPE) return new Primitive((byte) result);
if (operandType == Short.TYPE) return new Primitive((short) result);
if (operandType == Character.TYPE) return new Primitive((char) result);
}
return new Primitive(result);
} else if (operand instanceof Long)
return new Primitive(longUnaryOperation((Long) operand, kind));
else if (operand instanceof Float)
return new Primitive(floatUnaryOperation((Float) operand, kind));
else if (operand instanceof Double)
return new Primitive(doubleUnaryOperation((Double) operand, kind));
else throw new InterpreterError("An error occurred. Please call technical support.");
}
