}

    @Override
    protected void writeHeaders(final HttpServletResponse response) {
        ComponentUtil.getFessConfig().getApiDashboardResponseHeaderList().forEach(e -> response.setHeader(e.getFirst(), e.getSecond()));
    }

                        .collect(Collectors.groupingBy(Pair::getFirst, Collectors.mapping(Pair::getSecond, Collectors.toList())));
                appendJson("search-field", searchFieldMap, buf).append(',');
                final Map<String, List<String>> requestHeaderMap = entity.getRequestHeaderList().stream()
                        .collect(Collectors.groupingBy(Pair::getFirst, Collectors.mapping(Pair::getSecond, Collectors.toList())));

    Iterable<String> iterable = Collections.singletonList("foo");
    assertEquals("foo", Iterables.getFirst(iterable, "bar"));
  }

  public void testGetFirst_withDefault_empty() {
    Iterable<String> iterable = Collections.emptyList();
    assertEquals("bar", Iterables.getFirst(iterable, "bar"));
  }

  public void testGetFirst_withDefault_empty_null() {

        final String value = clientConfigMap.get(CRAWLER_CLIENTS);
        final CrawlerClient client = getClientRuleList(value).stream().map(e -> {
            if (e.getSecond().matcher(url).matches()) {
                return e.getFirst();
            }
            return null;
        }).filter(StringUtil::isNotBlank).findFirst()//
                .map(s -> clientFactory.getClient(s + ":" + url))//

     */
    public SLinkedList() {
        header.next = header;
        header.previous = header;
    }

    /**
     * 最初の要素を返します。
     *
     * @return 最初の要素
     */
    public E getFirst() {
        if (isEmpty()) {
            throw new NoSuchElementException();
        }
        return getFirstEntry().element;
    }

    /**
     * 最後の要素を返します。
     *
     * @return 最後の要素
     */

            final List<String> roles = new ArrayList<>();

            for (final Pair<String, String> searchFieldLog : searchLog.getSearchFieldLogList()) {
                final String name = searchFieldLog.getFirst();
                if (contentFieldNameSet.contains(name)) {
                    if (sb.length() > 0) {
                        sb.append(TEXT_SEP);
                    }

  /** @since 12.0 */
  @Override
  @CheckForNull
  public E ceiling(E e) {
    return Iterables.<@Nullable E>getFirst(tailSet(e, true), null);
  }

  /** @since 12.0 */
  @GwtIncompatible // NavigableSet
  @Override
  @CheckForNull
  public E higher(E e) {
    return Iterables.<@Nullable E>getFirst(tailSet(e, false), null);
  }

  @Override
  public E first() {
    return iterator().next();
  }

        final Pair<String, String>[] designJspFileNames = systemHelper.getDesignJspFileNames();
        assertEquals(1, designJspFileNames.length);
        assertEquals("xxx", designJspFileNames[0].getFirst());
        assertEquals("yyy", designJspFileNames[0].getSecond());
    }

    public void test_setForceStop() {
        assertFalse(systemHelper.isForceStop());
        systemHelper.setForceStop(true);

    @CheckForNull
    public E pollLast() {
      synchronized (mutex) {
        return delegate().pollLast();
      }
    }

    @Override
    public E getFirst() {
      synchronized (mutex) {
        return delegate().getFirst();
      }
    }

    @Override
    public E getLast() {
      synchronized (mutex) {
        return delegate().getLast();
      }
    }

  /** @since 12.0 */
  @Override
  @CheckForNull
  public E ceiling(E e) {
    return Iterables.<@Nullable E>getFirst(tailSet(e, true), null);
  }

  /** @since 12.0 */
  @GwtIncompatible // NavigableSet
  @Override
  @CheckForNull
  public E higher(E e) {
    return Iterables.<@Nullable E>getFirst(tailSet(e, false), null);
  }

  @Override
  public E first() {
    return iterator().next();
  }