// virtualHosts
        putResultDataBody(dataMap, fessConfig.getIndexFieldVirtualHost(),
                stream(crawlingConfig.getVirtualHosts()).get(stream -> stream.filter(StringUtil::isNotBlank).collect(Collectors.toList())));
        // TODO date
        // lang
        if (StringUtil.isNotBlank(fessConfig.getCrawlerDocumentFileDefaultLang())) {

                final List<String> urlList = split(startUrls.toString(), "\n")
                        .get(stream -> stream.map(String::trim).filter(StringUtil::isNotBlank).collect(Collectors.toList()));

                final String webUrls = urlList.stream()
                        .filter(s -> Arrays.stream(webProtocols).anyMatch(p -> s.startsWith(p)))
                        .collect(Collectors.joining("\n"));

                    uq.setUrl(d.getUrl());
                    uq.setWeight(d.getWeight());
                    return uq;
                })
                .collect(Collectors.toList());
        urlQueueService.offerAll(crawlerContext.sessionId, childList);
    }

    /**
     * Stores a single child URL to the crawling queue.
     * @param childUrl The child URL to store.

            protected List<String> loadDataStoreNameList() {
                // Return unsorted list to test sorting
                return List.of("Zebra", "Apple", "Banana").stream().sorted().collect(java.util.stream.Collectors.toList());
            }
        };

        List<String> names = testFactory.loadDataStoreNameList();
        assertEquals(3, names.size());
        assertEquals("Apple", names.get(0));

    }

    private ImmutableList<FluentFuture<?>> inputFutures() {
      return FluentIterable.from(inputs)
          .<FluentFuture<?>>transform(future -> future.state.future)
          .toList();
    }
  }

  /**
   * A generic {@link Combiner} that lets you use a lambda or method reference to combine two {@link

            String parentPath = entry.getKey();
            List<String> childNames = entry.getValue().stream()
                .map(this::getFileName)
                .collect(Collectors.toList());
            
            // Check if we have cached directory info
            DirectoryCacheEntry cache = leaseManager.getCacheEntry(parentPath);
            if (cache != null && cache.isComplete()) {

  }

  static class WithStreamParameter {
    private final List<?> list;

    // This should be ignored.
    public WithStreamParameter(Stream<?> s, String str) {
      this.list = s.collect(Collectors.toList());
      checkNotNull(str);
    }
  }

  static class UsesReferentialEquality {
    private final ReferentialEquality s;

    public UsesReferentialEquality(ReferentialEquality s) {

                return result.stream()
                        .map(o -> new Artifact((String) o.get("name"), (String) o.get("version"), (String) o.get("url")))
                        .collect(Collectors.toList());
            }
            return Collections.emptyList();
        } catch (final Exception e) {
            throw new PluginException("Failed to access " + url, e);
        }
    }

    /**

        dataMap.putAll(responseDataMap);
        dataMap.keySet()
                .stream()
                .filter(key -> key.endsWith(".overwrite")) //
                .collect(Collectors.toList())
                .forEach(key -> {
                    final String baseKey = key.substring(0, key.length() - ".overwrite".length());
                    final Object value = dataMap.remove(key);

   * <p><b>Note:</b> if mutability is not required and the elements are non-null, use {@link
   * ImmutableList#copyOf(Iterable)} instead. (Or, change {@code elements} to be a {@link
   * FluentIterable} and call {@code elements.toList()}.)
   *
   * <p><b>Note:</b> if {@code elements} is a {@link Collection}, you don't need this method. Use
   * the {@code ArrayList} {@linkplain ArrayList#ArrayList(Collection) constructor} directly, taking