if (StringUtil.isBlank(userCode)) {
            return null;
        }

        if (fessConfig.isValidUserCode(userCode)) {
            request.setAttribute(Constants.USER_CODE, userCode);
            return userCode;
        }
        return null;
    }

    protected String getId() {
        return UUID.randomUUID().toString().replace("-", StringUtil.EMPTY);
    }

        return DoubleMath.factorial(n);
      }

      @Override
      public int gcdInt(int a, int b) {
        return IntMath.gcd(a, b);
      }

      @Override
      public long gcdLong(long a, long b) {
        return LongMath.gcd(a, b);
      }

      @Override
      public long binomialCoefficient(int n, int k) {
        return LongMath.binomial(n, k);
      }

	return DelLoopbackRoutes(cfg)
}

type emptyDeps struct{}

func EmptyNlDeps() NetlinkDependencies {
	return &emptyDeps{}
}

func (r *emptyDeps) AddInpodMarkIPRule(cfg *Config) error {
	return nil
}

func (r *emptyDeps) DelInpodMarkIPRule(cfg *Config) error {
	return nil
}

func (r *emptyDeps) AddLoopbackRoutes(cfg *Config) error {
	return nil
}

            return ImmutableList.of(1, 2).iterator();
          }
        };
    assertFailure(tester);
  }

  public void testUnknownOrder() {
    new IteratorTester<Integer>(
        3, MODIFIABLE, newArrayList(1, 2), IteratorTester.KnownOrder.UNKNOWN_ORDER) {
      @Override
      protected Iterator<Integer> newTargetIterator() {
        return newArrayList(2, 1).iterator();
      }

	cause      error
}

func (err *s3Error) Cause() error {
	return err.cause
}

func (err *s3Error) ErrorCode() string {
	return err.code
}

func (err *s3Error) ErrorMessage() string {
	return err.message
}

func (err *s3Error) HTTPStatusCode() int {
	return err.statusCode
}

func (err *s3Error) Error() string {
	return err.message
}

func errCSVParsingError(err error) *s3Error {

		DeleteClauses:        []string{"DELETE", "FROM", "WHERE", "RETURNING"},
		LastInsertIDReversed: true,
	})

	return nil
}

func (DummyDialector) DefaultValueOf(field *schema.Field) clause.Expression {
	return clause.Expr{SQL: "DEFAULT"}
}

func (DummyDialector) Migrator(*gorm.DB) gorm.Migrator {
	return nil
}

func (DummyDialector) BindVarTo(writer clause.Writer, stmt *gorm.Statement, v interface{}) {

  }

  private int getCount(int index) {
    return (int) (cumulativeCounts[offset + index + 1] - cumulativeCounts[offset + index]);
  }

  @Override
  Entry<E> getEntry(int index) {
    return Multisets.immutableEntry(elementSet.asList().get(index), getCount(index));
  }

  @Override
  @CheckForNull
  public Entry<E> firstEntry() {
    return isEmpty() ? null : getEntry(0);
  }

  @Override

        if (commandLine.hasOption(CLIManager.FORCE)) {
            return Optional.of(Boolean.TRUE);
        }
        return Optional.empty();
    }

    @Override
    public Optional<Boolean> yes() {
        if (commandLine.hasOption(CLIManager.YES)) {
            return Optional.of(Boolean.TRUE);
        }
        return Optional.empty();
    }

    @Override
    public Optional<List<String>> goals() {

  @Override
  public int count(@CheckForNull Object element) {
    return forward.count(element);
  }

  @Override
  @CheckForNull
  public Entry<E> firstEntry() {
    return forward.lastEntry();
  }

  @Override
  @CheckForNull
  public Entry<E> lastEntry() {
    return forward.firstEntry();
  }

  @Override
  public int size() {
    return forward.size();
  }

  @Override

     * @param selectedMech
     * @return whether the specified mechanism is preferred
     */
    boolean isPreferredMech ( ASN1ObjectIdentifier selectedMech );


    /**
     * @return context flags
     */
    int getFlags ();


    /**
     * @return array of supported mechanism OIDs
     */
    ASN1ObjectIdentifier[] getSupportedMechs ();


    /**
     *