* otherwise returns an empty stream.
   */
  public static <T> Stream<T> stream(com.google.common.base.Optional<T> optional) {
    return optional.isPresent() ? Stream.of(optional.get()) : Stream.empty();
  }

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

        if (jobExecutor == null) {
            throw new ScheduledJobException("No jobExecutor: " + scriptType);
        }

        if (!jobManager.findJobByUniqueOf(LaJobUnique.of(id)).isPresent()) {
            if (logger.isDebugEnabled()) {
                logger.debug("Job is running: id={}", id);
            }
            return;
        }

        TimeoutTask task = null;
        try {

                          && (m.getModifiers() & (PUBLIC | PROTECTED | PRIVATE)) == 0)
              .transform(Method::getDeclaringClass);
      if (!supersWithPackagePrivateWriteReplace.isPresent()) {
        continue;
      }
      assertWithMessage(
              "To help optimizers, any class that inherits a package-private writeReplace() method"
                  + " should override that method.\n"

     *
     * @return ActionResponse directing to the appropriate page based on authentication result
     */
    @Execute
    public ActionResponse index() {
        if (fessLoginAssist.getSavedUserBean().isPresent()) {
            return redirectToSearchPage().orElseGet(() -> {
                if (logger.isDebugEnabled()) {
                    logger.debug("User is already logged in, redirecting to root.");
                }

   * @since 19.0
   */
  public long length() throws IOException {
    Optional<Long> lengthIfKnown = lengthIfKnown();
    if (lengthIfKnown.isPresent()) {
      return lengthIfKnown.get();
    }

    Closer closer = Closer.create();
    try {
      Reader reader = closer.register(openStream());
      return countBySkipping(reader);

   * @since 19.0
   */
  public long length() throws IOException {
    Optional<Long> lengthIfKnown = lengthIfKnown();
    if (lengthIfKnown.isPresent()) {
      return lengthIfKnown.get();
    }

    Closer closer = Closer.create();
    try {
      Reader reader = closer.register(openStream());
      return countBySkipping(reader);

     */
    @Execute
    public JsonResponse<ApiResult> list(final OptionalThing<String> id) {
        final List<Map<String, Object>> list = getFileItems(id.isPresent() ? decodePath(id.get()) : null);
        try {
            return asJson(new ApiResult.ApiStorageResponse().items(list).status(ApiResult.Status.OK).result());
        } catch (final ResultOffsetExceededException e) {

    assertEquals(expected.length(), source.length());
  }

  public void testLengthIfKnown() throws IOException {
    Optional<Long> lengthIfKnown = source.lengthIfKnown();
    if (lengthIfKnown.isPresent()) {
      assertEquals(expected.length(), (long) lengthIfKnown.get());
    }
  }

  public void testReadLines_withProcessor() throws IOException {
    List<String> list =
        source.readLines(

        jvmArgumentProviders.add(srcDistributionZip)
    }

    override fun executeTests() {
        cachesCleaner.get().cleanUpCaches()

        if (tracker.isPresent) {
            val daemonTrackerService = tracker.get()
            val testListener = daemonTrackerService.javaClass.getMethod("newDaemonListener").invoke(daemonTrackerService) as TestListener

     * @return true if the file configuration exists, false otherwise
     */
    protected Boolean isValidFileConfigId(final String fileconfigId) {
        return fileConfigService.getFileConfig(fileconfigId).isPresent();
    }