}

        public String getTimeAdjustTimeMillis() {
            return get(FessEnv.TIME_ADJUST_TIME_MILLIS);
        }

        public Long getTimeAdjustTimeMillisAsLong() {
            return getAsLong(FessEnv.TIME_ADJUST_TIME_MILLIS);
        }

        public String getMailSendMock() {
            return get(FessEnv.MAIL_SEND_MOCK);
        }

        public boolean isMailSendMock() {

                } catch (NumberFormatException e) {
                    return null;
                }
            }

            @Override
            public Long getAsLong(String propertyKey) {
                String value = get(propertyKey);
                if (value == null) {
                    return null;
                }
                try {

  @Beta
  @InlineMe(replacement = "optional.stream()")
  @InlineMeValidationDisabled("Java 9+ API only")
  public static LongStream stream(OptionalLong optional) {
    return optional.isPresent() ? LongStream.of(optional.getAsLong()) : LongStream.empty();
  }

  /**
   * If a value is present in {@code optional}, returns a stream containing only that element,
   * otherwise returns an empty stream.
   *