public interface ExtensibleEnumRegistry<T extends ExtensibleEnum> extends Service {
    @Nonnull
    Optional<T> lookup(@Nonnull String id);

    @Nonnull
    default T require(@Nonnull String id) {
        return lookup(id).orElseThrow(() -> new IllegalArgumentException("Unknown extensible enum value '" + id + "'"));
    }

                    .filter(project -> projectSelector.isMatchingProject(project, selector, reactorDirectory))
                    .findFirst()
                    .orElseThrow(() -> new MavenExecutionException(
                            "Could not find project to resume reactor build from: " + selector + " vs "
                                    + formatProjects(projects),

     *
     * @param id the id of the type to retrieve
     * @return the type
     */
    @Nonnull
    @Override
    default Type require(@Nonnull String id) {
        return lookup(id).orElseThrow(() -> new IllegalArgumentException("Unknown extensible enum value '" + id + "'"));
    }

    @Override
    public <T> T lookup(Class<T> type) {
        return objects.stream()
                .filter(type::isInstance)
                .map(type::cast)
                .findAny()
                .orElseThrow(() -> new LookupException("No service of type " + type));
    }

    @Override
    public <T> T lookup(Class<T> type, String name) {
        return null;
    }

    @Override

                stream(request.getParameterValues(name)).of(stream -> stream.filter(StringUtil::isNotBlank).forEach(permissionSet::add));
                return OptionalEntity.of(permissionSet);
            }).orElseThrow(() -> new InvalidAccessTokenException("invalid_token", "Invalid token: " + token));
        }
        return OptionalEntity.empty();
    }

                        messages -> messages.addErrorsFailedToProcessSsoRequest(UserMessages.GLOBAL_PROPERTY_KEY, e.getMessage()),
                        "Failed to process metadata.", e);
            }
        }).orElseThrow(() -> new SsoMessageException(
                messages -> messages.addErrorsFailedToProcessSsoRequest(UserMessages.GLOBAL_PROPERTY_KEY, "Invalid state."),

        return getCanonicalPath(Optional.ofNullable(
                        ServiceLoader.load(RootLocator.class).iterator().next().findMandatoryRoot(topDirectory))
                .orElseThrow());
    }

        DispatcherMeta meta = secDispatcher.availableDispatchers().stream()
                .filter(d -> Objects.equals(config.getDefaultDispatcher(), d.name()))
                .findFirst()
                .orElseThrow();
        if (!meta.fields().isEmpty()) {
            result = prompt.prompt(
                    context.header,
                    configureDispatcher(context, meta, prompt.getPromptBuilder())

    }

    public String getServerPath() {
        return getSessionManager().getAttribute(Constants.SEARCH_ENGINE_API_ACCESS_TOKEN, String.class).map(token -> ADMIN_SERVER + token)
                .orElseThrow(() -> new FessSystemException("Cannot create an access token."));
    }

    public void saveToken() {

 *
 * <ul>
 *   <li>This class is serializable; {@code java.util.Optional} is not.
 *   <li>{@code java.util.Optional} has the additional methods {@code ifPresent}, {@code filter},
 *       {@code flatMap}, and {@code orElseThrow}.
 *   <li>{@code java.util} offers the primitive-specialized versions {@code OptionalInt}, {@code
 *       OptionalLong} and {@code OptionalDouble}, the use of which is recommended; Guava does not
 *       have these.
 * </ul>