*
   * @throws NumberFormatException if the string does not contain a valid unsigned {@code long}
   *     value
   * @throws NullPointerException if {@code string} is null (in contrast to {@link
   *     Long#parseLong(String)})
   */
  @CanIgnoreReturnValue
  public static long parseUnsignedLong(String string) {
    return parseUnsignedLong(string, 10);
  }

  /**

  }

  /**
   * Parses the specified string as a signed decimal long value. The ASCII character {@code '-'} (
   * <code>'&#92;u002D'</code>) is recognized as the minus sign.
   *
   * <p>Unlike {@link Long#parseLong(String)}, this method returns {@code null} instead of throwing
   * an exception if parsing fails. Additionally, this method only accepts ASCII digits, and returns
   * {@code null} if non-ASCII digits are present in the string.

   *     Integer#parseInt(String)})
   */
  @CanIgnoreReturnValue
  public static int parseUnsignedInt(String string, int radix) {
    checkNotNull(string);
    long result = Long.parseLong(string, radix);
    if ((result & INT_MASK) != result) {
      throw new NumberFormatException(
          "Input " + string + " in base " + radix + " is not in the range of an unsigned integer");
    }

                effectiveDateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSS";
            }
            if ("long".equals(effectiveDateFormat)) {
                try {
                    return new java.util.Date(Long.parseLong(s));
                } catch (NumberFormatException e) {
                    throw new XmlPullParserException(e.getMessage(), parser, e);
                }
            } else {
                try {

     */
    private static class LongItem implements Item {
        private final long value;

        LongItem(String str) {
            this.value = Long.parseLong(str);
        }

        @Override
        public int getType() {
            return LONG_ITEM;
        }

        @Override
        public boolean isNull() {
            return value == 0;