*/
  @SuppressWarnings("unchecked")
  public static <T> Collector<T, ?, Optional<T>> toOptional() {
    return (Collector) TO_OPTIONAL;
  }

  private static final Object NULL_PLACEHOLDER = new Object();

  private static final Collector<@Nullable Object, ?, @Nullable Object> ONLY_ELEMENT =
      Collector.<@Nullable Object, ToOptionalState, @Nullable Object>of(
          ToOptionalState::new,

    QUEUED,
    RUNNING,
  }

  /** Underlying executor that all submitted Runnable objects are run on. */
  private final Executor executor;

  @GuardedBy("queue")
  private final Deque<Runnable> queue = new ArrayDeque<>();

  /** see {@link WorkerRunningState} */
  @LazyInit
  @GuardedBy("queue")
  private WorkerRunningState workerRunningState = IDLE;

  /**

    assertSideEffectFree(hash);
    assertReadableBytes(hash);
  }

  private static void assertSideEffectFree(HashCode hash) {
    byte[] original = hash.asBytes();
    byte[] mutated = hash.asBytes();
    mutated[0]++;
    assertTrue(Arrays.equals(original, hash.asBytes()));
  }

  private static void assertReadableBytes(HashCode hashCode) {
    assertTrue(hashCode.bits() >= 32); // sanity

public class DataConfig extends BsDataConfig implements CrawlingConfig {

    private static final long serialVersionUID = 1L;

    private static final Logger logger = LogManager.getLogger(DataConfig.class);

    private static final String CRAWLER_WEB_PREFIX = "crawler.web.";

    private static final String CRAWLER_WEB_HEADER_PREFIX = CRAWLER_WEB_PREFIX + "header.";

    private static final String CRAWLER_WEB_AUTH = CRAWLER_WEB_PREFIX + "auth";

    assertEquals(value, generator.generateFresh(type));
    assertEquals(value, generator.generateFresh(type));
  }

  private enum EmptyEnum {}

  private enum OneConstantEnum {
    CONSTANT1
  }

  private enum TwoConstantEnum {
    CONSTANT1,
    CONSTANT2
  }

  private static void assertCanGenerateOnly(TypeToken<?> type, Object expected) {
    FreshValueGenerator generator = new FreshValueGenerator();

  }

  // preserve singleton-ness, so equals() and hashCode() work correctly
  private Object readResolve() {
    return INSTANCE;
  }

  @Override
  public String toString() {
    return "Ordering.usingToString()";
  }

  private UsingToStringOrdering() {}

  @GwtIncompatible @J2ktIncompatible private static final long serialVersionUID = 0;

        super();
    }

    /**
     *
     */
    private static final long serialVersionUID = -3847521461674504364L;

    private static final Logger log = LoggerFactory.getLogger(NetworkExplorer.class);

    /** The CSS style for HTML rendering */
    private String style;
    /** Flag indicating if credentials were supplied */
    private boolean credentialsSupplied;
    /** Flag to enable basic authentication */

/**
 * Represents an NTLMSSP Type-1 message.
 */
public class Type1Message extends NtlmMessage {

    private static final int DEFAULT_FLAGS;

    private static final String DEFAULT_DOMAIN;

    private static final String DEFAULT_WORKSTATION;

    private String suppliedDomain;

    private String suppliedWorkstation;

    static {
        DEFAULT_FLAGS = NTLMSSP_NEGOTIATE_NTLM

    private static final long serialVersionUID = 1L;

    private static final Logger logger = LogManager.getLogger(WebAuthentication.class);

    private WebConfig webConfig;

    public Authentication getAuthentication() {
        return new AuthenticationImpl(getAuthScope(), getCredentials(), getAuthScheme());
    }

    private AuthScheme getAuthScheme() {

     */

    private static final NameServiceClient CLIENT = new NameServiceClient();

    private static final int DEFAULT_CACHE_POLICY = 30;
    private static final int CACHE_POLICY = Config.getInt("jcifs.smb1.netbios.cachePolicy", DEFAULT_CACHE_POLICY);
    private static final int FOREVER = -1;
    private static int nbnsIndex = 0;

    private static final HashMap ADDRESS_CACHE = new HashMap();