*/
    public static BigInteger toBigInteger(final Object o) {
        return toBigInteger(o, null);
    }

    /**
     * {@link BigInteger}に変換します。
     *
     * @param o
     *            変換元のオブジェクト
     * @param pattern
     *            パターン文字列
     * @return 変換された{@link BigInteger}
     */
    public static BigInteger toBigInteger(final Object o, final String pattern) {
        if (o == null) {

public class BigIntegerConversionUtilTest extends TestCase {

    /**
     * @throws Exception
     */
    public void testToBigIntegerForEmptyString() throws Exception {
        assertNull(BigIntegerConversionUtil.toBigInteger(""));
    }

  private static final BigDecimal MIN_LONG_AS_BIG_DECIMAL = BigDecimal.valueOf(Long.MIN_VALUE);

  public void testConstantsMaxFactorial() {
    BigInteger maxDoubleValue = BigDecimal.valueOf(Double.MAX_VALUE).toBigInteger();
    assertTrue(BigIntegerMath.factorial(DoubleMath.MAX_FACTORIAL).compareTo(maxDoubleValue) <= 0);
    assertTrue(
        BigIntegerMath.factorial(DoubleMath.MAX_FACTORIAL + 1).compareTo(maxDoubleValue) > 0);
  }

        } else if (type == Short.class) {
            return ShortConversionUtil.toShort(o);
        } else if (type == BigInteger.class) {
            return BigIntegerConversionUtil.toBigInteger(o);
        } else if (type == Byte.class) {
            return ByteConversionUtil.toByte(o);
        }
        return o;
    }

    /**
     * 指定されたプリミティブ型に対応するラッパー型に変換して返します。
     *
     * @param type

    InetAddress address = InetAddresses.forString(ip);
    boolean isIpv6 = address instanceof Inet6Address;
    assertEquals(bigIntegerIp, InetAddresses.toBigInteger(address));
    assertEquals(
        address,
        isIpv6
            ? InetAddresses.fromIPv6BigInteger(bigIntegerIp)
            : InetAddresses.fromIPv4BigInteger(bigIntegerIp));
  }

   *
   * @param address {@link InetAddress} to convert
   * @return {@code BigInteger} representation of the address
   * @since 28.2
   */
  public static BigInteger toBigInteger(InetAddress address) {
    return new BigInteger(1, address.getAddress());
  }

  /**
   * Returns an Inet4Address having the integer value specified by the argument.
   *

   *
   * @param address {@link InetAddress} to convert
   * @return {@code BigInteger} representation of the address
   * @since 28.2
   */
  public static BigInteger toBigInteger(InetAddress address) {
    return new BigInteger(1, address.getAddress());
  }

  /**
   * Returns an Inet4Address having the integer value specified by the argument.
   *