}
      }
    }
    if (ipString.charAt(0) == IPV6_DELIMITER && ipString.charAt(1) != IPV6_DELIMITER) {
      return null; // ^: requires ^::
    }
    if (ipString.charAt(ipString.length() - 1) == IPV6_DELIMITER
        && ipString.charAt(ipString.length() - 2) != IPV6_DELIMITER) {
      return null; // :$ requires ::$
    }

        return !isBlank(str);
    }

    /**
     * charを含んでいるかどうか返します。
     *
     * @param str
     *            文字列
     * @param ch
     *            char
     * @return charを含んでいるかどうか
     */
    public static boolean contains(final String str, final char ch) {
        if (isEmpty(str)) {
            return false;
        }

`UploadFile` tem os seguintes métodos `async`. Todos eles chamam os métodos de arquivos por baixo dos panos (usando o objeto `SpooledTemporaryFile` interno).

* `write(data)`: escreve dados (`data`) em `str` ou `bytes` no arquivo.

    private static final String COMMENT_CHARS = "#!";

    /** The list of possible key/value separators */
    private static final char[] SEPARATORS = new char[] {'=', ':'};

    /** The white space characters used as key/value separators. */
    private static final char[] WHITE_SPACE = new char[] {' ', '\t', '\f'};

    /**
     * Unless standard java props, use UTF-8
     */

                }
            } else if( Character.isDigit( line.charAt( 0 ))) {
                char[] data = line.toCharArray();
                int ip, i, j;
                Name name;
                NbtAddress addr;
                char c;

                c = '.';
                ip = i = 0;
                for( ; i < data.length && c == '.'; i++ ) {

    }
    return String.valueOf(newChars);
  }

  /**
   * If the argument is a {@linkplain #isLowerCase(char) lowercase ASCII character}, returns the
   * uppercase equivalent. Otherwise returns the argument.
   */
  public static char toUpperCase(char c) {
    return isLowerCase(c) ? (char) (c ^ CASE_MASK) : c;
  }

  /**

        }

        private void concatPath(StringBuilder url, String path) {
            if (!path.isEmpty()) {
                boolean initialUrlEndsWithSlash = url.charAt(url.length() - 1) == '/';
                boolean pathStartsWithSlash = path.charAt(0) == '/';

                if (pathStartsWithSlash) {
                    if (initialUrlEndsWithSlash) {
                        // 1 extra '/' to remove

                continue;
            }

            char ch = s.charAt(pos);
            pos++;
            if (ch == '\\') {
                sb.append(ch);
                if (pos >= end) {
                    break; // ERROR, or let it go?
                }
                ch = s.charAt(pos);
                pos++;
            }

            sb.append(ch);
        }

      int bytesWritten = 0;
      for (int i = 0; i < chars.length(); ) {
        int chunk = alphabet.decode(chars.charAt(i++)) << 18;
        chunk |= alphabet.decode(chars.charAt(i++)) << 12;
        target[bytesWritten++] = (byte) (chunk >>> 16);
        if (i < chars.length()) {
          chunk |= alphabet.decode(chars.charAt(i++)) << 6;
          target[bytesWritten++] = (byte) ((chunk >>> 8) & 0xFF);
          if (i < chars.length()) {

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