case DOWN:
        return x;

      case UP:
        if (isMathematicalInteger(x)) {
          return x;
        } else {
          return (long) x + (x > 0 ? 1 : -1);
        }

      case HALF_EVEN:
        return rint(x);

      case HALF_UP:
        {
          double z = rint(x);
          if (abs(x - z) == 0.5) {
            return x + copySign(0.5, x);
          } else {
            return z;

import static java.math.RoundingMode.CEILING;
import static java.math.RoundingMode.DOWN;
import static java.math.RoundingMode.FLOOR;
import static java.math.RoundingMode.HALF_DOWN;
import static java.math.RoundingMode.HALF_EVEN;
import static java.math.RoundingMode.HALF_UP;
import static java.math.RoundingMode.UNNECESSARY;
import static java.math.RoundingMode.UP;
import static java.util.Arrays.asList;