return listProduct(bignums).shiftLeft(shift);
  }

  static BigInteger listProduct(List<BigInteger> nums) {
    return listProduct(nums, 0, nums.size());
  }

  static BigInteger listProduct(List<BigInteger> nums, int start, int end) {
    switch (end - start) {
      case 0:
        return BigInteger.ONE;
      case 1:
        return nums.get(start);
      case 2:

        }

        return ImmutableList.of();
      };

  /**
   * Returns a predicate that returns the result of {@link File#isDirectory} on input files.
   *
   * @since 15.0
   */
  public static Predicate<File> isDirectory() {
    return FilePredicate.IS_DIRECTORY;
  }

  /**
   * Returns a predicate that returns the result of {@link File#isFile} on input files.
   *
   * @since 15.0
   */

     *
     * @return default current page number
     */
    protected int getDefaultCurrentPageNumber() {
        return Constants.DEFAULT_ADMIN_PAGE_NUMBER;
    }

    /**
     * Gets the default page size from system configuration.
     *
     * @return default page size
     */
    protected int getDefaultPageSize() {

    /**
     * Returns an {@link Iterable} that wraps a {@link SingleValueIterator} for use in a for-each statement.
     *
     * @param <E> the element type
     * @param value the single value returned by the iterator
     * @return an {@link Iterable} wrapping a {@link SingleValueIterator}
     */
    public static <E> Iterable<E> iterable(final E value) {
        return () -> new SingleValueIterator<>(value);
    }

        assertArgumentNotNull("reader", reader);
        return iterable(new BufferedReader(reader));
    }

    /**
     * Returns an {@link Iterable} that wraps a {@link LineIterator} for use in enhanced for-loops.
     *
     * @param reader
     *            The {@link BufferedReader} to read strings from. Must not be {@literal null}.
     * @return An {@link Iterable} that wraps a {@link LineIterator}.
     */

        if (maxLength != null && maxLength >= 0L) {
            return maxLength;
        }
        return defaultMaxLength;
    }

    /**
     * Returns the default maximum content length.
     * @return The default maximum content length in bytes.
     */
    public long getDefaultMaxLength() {
        return defaultMaxLength;
    }

    /**
     * Sets the default maximum content length.

    if (http2Connection == null) return false

    // 2. The routes must share an IP address.
    if (routes == null || !routeMatchesAny(routes)) return false

    // 3. This connection's server certificates must cover the new host.
    if (address.hostnameVerifier !== OkHostnameVerifier) return false
    if (!supportsUrl(address.url)) return false

    // 4. Certificate pinning must match the host.

    if (result == null) {
      result = readHeader()
      peekedHeader = result
    }

    if (result.isEndOfData) return null

    return result
  }

  /**
   * Consume the next header in the stream and return it. If there is no header to read because we
   * have reached a limit, this returns [END_OF_DATA].
   */
  internal fun readHeader(): DerHeader {
    require(peekedHeader == null)

        if (!includeObject && clazz == Object.class) {
            return false;
        }
        return clazz != null;
    }

    @Override
    public Class<?> next() {
        if (!hasNext()) {
            throw new NoSuchElementException();
        }
        final Class<?> result = clazz;
        clazz = clazz.getSuperclass();
        return result;
    }

    @Override
    public void remove() {

      }
      return textToNumericFormatV4(ipString);
    }
    return null;
  }

  private static byte @Nullable [] textToNumericFormatV4(String ipString) {
    if (IPV4_DELIMITER_MATCHER.countIn(ipString) + 1 != IPV4_PART_COUNT) {
      return null; // Wrong number of parts
    }

    byte[] bytes = new byte[IPV4_PART_COUNT];
    int start = 0;