private static LogStream log = LogStream.getInstance();

    private MimeMap mimeMap;
    private String style;
    private NtlmSsp ntlmSsp;
    private boolean credentialsSupplied;
    private boolean enableBasic;
    private boolean insecureBasic;
    private String realm, defaultDomain;

    public void init() throws ServletException {
        InputStream is;
        StringBuffer sb = new StringBuffer();

     *
     * @param visitor the visitor to call back, must not be {@code null}
     * @return {@code true} to visit siblings nodes of this node as well, {@code false} to skip siblings
     */
    boolean accept(@Nonnull NodeVisitor visitor);

    /**
     * Returns a new tree starting at this node, filtering the children.
     * Note that this node will not be filtered and only the children

    @Override
    protected void setupHtmlData(final ActionRuntime runtime) {
        super.setupHtmlData(runtime);
        systemHelper.setupAdminHtmlData(this, runtime);

        final Boolean editable = getUserBean()
                .map(user -> user.hasRoles(fessConfig.getAuthenticationAdminRolesAsArray()) || user.hasRole(getActionRole())).orElse(false);
        runtime.registerData("editable", editable);

      yieldUntil()
    }
  }

  /** Process the queue until [condition] returns true. */
  private tailrec fun yieldUntil(
    strategy: ResumePriority = ResumePriority.AfterEnqueuedTasks,
    condition: () -> Boolean = { true },
  ) {
    taskRunner.assertThreadHoldsLock()
    val self = currentTask

    val yieldCompleteTask =
      object : SerialTask {
        override fun isReady() = condition()

    }

    /**
     * 空かどうかを返します。
     *
     * @return 空かどうか
     */
    public boolean isEmpty() {
        return size == 0;
    }

    /**
     * 要素が含まれているかどうかを返します。
     *
     * @param element
     *            要素
     * @return 要素が含まれているかどうか
     */
    public boolean contains(final E element) {
        return indexOf(element) != -1;
    }

    /**
     * 要素を削除します。

    }
    return classes;
  }

  private static boolean hasTest(Class<?> testClass, Iterable<String> testNames) {
    for (String testName : testNames) {
      try {
        testClass.getMethod(testName);
        return true;
      } catch (NoSuchMethodException e) {
        continue;
      }
    }
    return false;
  }

  private static boolean isEqualsDefined(Class<?> cls) {
    try {

        buf.append("[HOTTHREAD MONITOR] ");

        final FessConfig fessConfig = ComponentUtil.getFessConfig();

        buf.append('{');

        final boolean ignoreIdleThreads = Constants.TRUE.equalsIgnoreCase(fessConfig.getCrawlerHotthreadIgnoreIdleThreads());
        final TimeValue interval = TimeValue.parseTimeValue(fessConfig.getCrawlerHotthreadInterval(), "crawler.hotthread.interval");

        return getXContentBuilderOutputStream((builder, params) -> xContent.toXContent(builder, params), mediaType);
    }

    public static long scroll(final String index, final Function<SearchHit, Boolean> callback) {
        final SearchEngineClient client = ComponentUtil.getSearchEngineClient();
        return client.<SearchHit> scrollSearch(index, searchRequestBuilder -> true, (searchResponse, hit) -> hit,

            } catch (final Exception e) {
                logger.warn("Failed to apply {} to {}.", regexPattern.pattern(), input, e);
            }
        }
        return input;
    }

    public boolean hasUAMathcer() {
        return StringUtil.isNotBlank(getUserAgent());
    }

    public Matcher getUAMatcher(final CharSequence input) {
        if (!hasUAMathcer()) {
            return null;
        }

        throw ite.cause!!
      }
    }
  }

  @Suppress("UNUSED_PARAMETER")
  private fun expectedFailure(
    className: String,
    cause: Throwable,
  ): Boolean {
    return when (className) {
      "okhttp3.recipes.CheckHandshake" -> true // by design
      "okhttp3.recipes.RequestBodyCompression" -> true // expired token
      else -> false
    }
  }