// 0 or 2+ colons. Bare hostname or IPv6 literal.
        host = hostPortString;
        hasBracketlessColons = (colonPos >= 0);
      }
    }

    int port = NO_PORT;
    if (!Strings.isNullOrEmpty(portString)) {
      // Try to parse the whole port string as a number.
      // JDK7 accepts leading plus signs. We don't want to.
      checkArgument(

   *
   * @param string a string reference to check
   * @return {@code true} if the string is null or is the empty string
   */
  public static boolean isNullOrEmpty(@CheckForNull String string) {
    return Platform.stringIsNullOrEmpty(string);
  }

  /**
   * Returns a string, of length at least {@code minLength}, consisting of {@code string} prepended

   *
   * @param string a string reference to check
   * @return {@code true} if the string is null or is the empty string
   */
  public static boolean isNullOrEmpty(@CheckForNull String string) {
    return Platform.stringIsNullOrEmpty(string);
  }

  /**
   * Returns a string, of length at least {@code minLength}, consisting of {@code string} prepended