}

  @Override
  public @Nullable Entry<E> firstEntry() {
    return isEmpty() ? null : getEntry(0);
  }

  @Override
  public @Nullable Entry<E> lastEntry() {
    return isEmpty() ? null : getEntry(length - 1);
  }

  @Override
  public int count(@Nullable Object element) {
    int index = elementSet.indexOf(element);

     * Gets the identifier of this repository.
     *
     * @return the (case-sensitive) identifier, never {@code null}
     */
    @Nonnull
    String getId();

    /**
     * Gets the type of the repository, for example "default".
     *
     * @return the (case-sensitive) type of the repository, never {@code null}
     */
    @Nonnull
    String getType();

    public static void setFessConfig(final FessConfig fessConfig) {
        ComponentUtil.fessConfig = fessConfig;
        if (fessConfig == null) {
            systemHelper = null;
            FessProp.propMap.clear();
            componentMap.clear();
        }
    }

    /**
     * Registers a component instance with a name.
     * @param instance The component instance to register.

      if (state != null) {
        state.transitionService(service, NEW, STARTING);
        if (!(service instanceof NoOpService)) {
          logger.get().log(Level.FINE, "Starting {0}.", service);
        }
      }
    }

    @Override
    public void running() {
      ServiceManagerState state = this.state.get();
      if (state != null) {

        ArtifactResolutionResult result = artifactResolver.resolveTransitively(
                Collections.singleton(g), projectArtifact, remoteRepositories(), localRepository(), null);

        printErrors(result);

        assertEquals(2, result.getArtifacts().size());

        assertTrue(result.getArtifacts().contains(g));

        assertTrue(result.getArtifacts().contains(h));

    }

    public void test_execute_withNullContext() {
        // Test execute method with null context
        MatchAllDocsQuery query = new MatchAllDocsQuery();
        float boost = 1.0f;

        QueryBuilder result = matchAllQueryCommand.execute(null, query, boost);

        assertNotNull(result);
        assertTrue(result instanceof MatchAllQueryBuilder);
    }

        return of(element);
      default:
        return new RegularImmutableList<E>(ImmutableList.<E>nullCheckedList(elements));
    }
  }

  // Factory method that skips the null checks.  Used only when the elements
  // are guaranteed to be non-null.
  static <E> ImmutableList<E> unsafeDelegateList(List<? extends E> list) {
    switch (list.size()) {
      case 0:
        return of();
      case 1:

        assertEquals("", key);
    }

    public void test_getHostKey_nullVirtualHost() {
        RelatedQuery entity = createRelatedQuery("term", new String[] { "query" }, null);
        String key = relatedQueryHelper.getHostKey(entity);
        assertEquals("", key);
    }

    public void test_getHostKey_withVirtualHost() {

    }

    @Test
    @DisplayName("Constructor should handle null configuration")
    void testConstructorWithNullConfig() {
        // Given & When
        Smb2LockResponse lockResponse = new Smb2LockResponse(null);

        // Then
        assertNotNull(lockResponse);
    }

    @Nested
    @DisplayName("writeBytesWireFormat tests")

  @Override public Response intercept(Interceptor.Chain chain) throws IOException {
    Request originalRequest = chain.request();
    if (originalRequest.body() == null || originalRequest.header("Content-Encoding") != null) {
      return chain.proceed(originalRequest);
    }

    Request compressedRequest = originalRequest.newBuilder()
        .header("Content-Encoding", "gzip")