} catch (ArithmeticException expected) {
        // do nothing
      }

      if (expectedDouble != null) {
        assertThat(LongMath.roundToDouble(candidate, UNNECESSARY)).isEqualTo(expectedDouble);
      } else {
        assertThrows(
            ArithmeticException.class, () -> LongMath.roundToDouble(candidate, UNNECESSARY));
      }
    }
  }

   *     is not a power of two
   */
  @SuppressWarnings("fallthrough")
  // TODO(kevinb): remove after this warning is disabled globally
  public static int log2(BigInteger x, RoundingMode mode) {
    checkPositive("x", checkNotNull(x));
    int logFloor = x.bitLength() - 1;
    switch (mode) {
      case UNNECESSARY:

      // every mode except UNNECESSARY
      BigDecimal expected = new BigDecimal(d).setScale(0, UNNECESSARY);
      boolean isInBounds =
          expected.compareTo(MAX_LONG_AS_BIG_DECIMAL) <= 0
              & expected.compareTo(MIN_LONG_AS_BIG_DECIMAL) >= 0;

      try {
        assertEquals(expected.longValue(), DoubleMath.roundToLong(d, UNNECESSARY));
        assertTrue(isInBounds);

            .isEqualTo(expectation);
      }

      if (!expectedValues.containsKey(UNNECESSARY)) {
        assertWithMessage("Expected roundUnnecessaryShouldThrow call")
            .that(unnecessaryShouldThrow)
            .isTrue();
        assertThrows(
            ArithmeticException.class, () -> BigIntegerMath.roundToDouble(input, UNNECESSARY));
      }
    }
  }

  @J2ktIncompatible
  @GwtIncompatible

      if (!expectedValues.containsKey(UNNECESSARY)) {
        assertWithMessage("Expected roundUnnecessaryShouldThrow call")
            .that(unnecessaryShouldThrow)
            .isTrue();
        assertThrows(
            "Expected ArithmeticException for roundToDouble(" + input + ", UNNECESSARY)",
            ArithmeticException.class,
            () -> BigDecimalMath.roundToDouble(input, UNNECESSARY));
      }
    }
  }

import static java.lang.Math.min;
import static java.math.BigInteger.valueOf;
import static java.math.RoundingMode.DOWN;
import static java.math.RoundingMode.FLOOR;
import static java.math.RoundingMode.UNNECESSARY;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.testing.NullPointerTester;

   * @throws ArithmeticException if {@code mode} is {@link RoundingMode#UNNECESSARY} and {@code x}
   *     is not a power of two
   */
  @SuppressWarnings("fallthrough")
  // TODO(kevinb): remove after this warning is disabled globally
  public static int log2(long x, RoundingMode mode) {
    checkPositive("x", x);
    switch (mode) {
      case UNNECESSARY:
        checkRoundingUnnecessary(isPowerOfTwo(x));
      // fall through

  /**
   * Figures out the HTTP request to make in response to receiving [userResponse]. This will
   * either add authentication headers, follow redirects or handle a client request timeout. If a
   * follow-up is either unnecessary or not applicable, this returns null.
   */
  @Throws(IOException::class)
  private fun followUpRequest(
    userResponse: Response,
    exchange: Exchange?,
  ): Request? {

   * each appears first in the source collection.
   *
   * <p><b>Performance note:</b> This method will sometimes recognize that the actual copy operation
   * is unnecessary; for example, {@code copyOf(copyOf(anArrayList))} will copy the data only once.
   * This reduces the expense of habitually making defensive copies at API boundaries. However, the

    var value = 0
    val groupOffset = i
    while (i < limit) {
      val c = input[i]
      if (c < '0' || c > '9') break
      if (value == 0 && groupOffset != i) return false // Reject unnecessary leading '0's.
      value = value * 10 + c.code - '0'.code
      if (value > 255) return false // Value out of range.
      i++
    }
    val groupLength = i - groupOffset