* @throws NullPointerException if {@code string} is null
   */
  @Override
  public String escape(String string) {
    checkNotNull(string); // GWT specific check (do not optimize)
    // Inlineable fast-path loop which hands off to escapeSlow() only if needed
    int length = string.length();
    for (int index = 0; index < length; index++) {
      if (escape(string.charAt(index)) != null) {
        return escapeSlow(string, index);
      }

fi

# Gets the download command supported by the system (currently either curl or wget)
DOWNLOAD_COMMAND=""
function set_download_command () {
  # Try curl.
  if command -v curl > /dev/null; then
    if curl --version | grep Protocols  | grep https > /dev/null; then
      DOWNLOAD_COMMAND="curl -fLSs --retry 5 --retry-delay 1 --retry-connrefused"
      return
    fi
    echo curl does not support https, will try wget for downloading files.
  else

					<fmt:formatDate value="${fe:parseDate(doc.last_modified)}" type="BOTH" pattern="yyyy-MM-dd HH:mm" />
					<c:if test="${doc.last_modified==null || doc.last_modified==''}">
						<fmt:formatDate value="${fe:parseDate(doc.created)}" type="BOTH" pattern="yyyy-MM-dd HH:mm" />
					</c:if>
					<c:if test="${doc.content_length!=null && doc.content_length!=''}">
						<div class="d-sm-none"></div>
						<span class="d-none d-sm-inline">&nbsp;</span>

          while (true) {
            val action = actions.poll() ?: break
            action(stream)
          }
        }
      }
      return@FutureTask null
    }
  }

  /** Returns once all stream actions complete successfully. */
  fun awaitSuccess() {
    val futureTask =
      results.poll(5, TimeUnit.SECONDS)
        ?: throw AssertionError("no onRequest call received")

                if (isValid(urlQueue)) {
                    ResponseData responseData = null;
                    log(logHelper, LogType.START_CRAWLING, crawlerContext, urlQueue);
                    try {
                        final CrawlerClient client = getClient(urlQueue.getUrl());
                        if (client == null) {

        }
    }

    /**
     * 指定した初期コンテキストから指定されたオブジェクトを取得して返します。
     *
     * @param ctx
     *            初期コンテキスト。{@literal null}であってはいけません
     * @param jndiName
     *            検索するオブジェクトの名前。{@literal null}や空文字列であってはいけません
     * @return <code>jndiName</code>にバインドされているオブジェクト
     * @throws NamingRuntimeException
     *             初期コンテキストを作成できなかった場合にスローされます
     */

        convertedTexts.add(text);

        for (final ReadingConverter converter : converters) {
            String s;
            while ((s = queue.poll()) != null && convertedTexts.size() <= getMaxReadingNum()) {
                final List<String> results = converter.convert(s, field, lang);
                convertedTexts.addAll(results);
            }

   *     return ref.get() == null;
   *   }
   * });
   * }</pre>
   *
   * @throws RuntimeException if timed out or interrupted while waiting
   */
  public static void awaitClear(WeakReference<?> ref) {
    awaitDone(
        new FinalizationPredicate() {
          @Override
          public boolean isDone() {
            return ref.get() == null;
          }
        });
  }

  override fun contentType(): MediaType? = null

  override fun writeTo(sink: BufferedSink) {
    requestBodySinks.add(sink)
  }

  override fun isDuplex(): Boolean = true

  @Throws(InterruptedException::class)
  fun takeSink(): BufferedSink {
    return requestBodySinks.poll(5, SECONDS) ?: throw AssertionError("no sink to take")
  }

  fun assertNoMoreSinks() {

      override fun evaluate() {
        beforeEach(null)
        try {
          base.evaluate()
        } finally {
          afterEach(null)
        }
      }
    }
  }

  fun takeAll(): List<String> {
    val list = mutableListOf<String>()
    logs.drainTo(list)
    return list
  }

  fun take(): String {
    return logs.poll(10, TimeUnit.SECONDS)