public @Nullable V get(@Nullable Object rowKey, @Nullable Object columnKey) {
    Map<C, V> row = safeGet(rowMap(), rowKey);
    return (row == null) ? null : safeGet(row, columnKey);
  }

  @Override
  public boolean isEmpty() {
    return size() == 0;
  }

  @Override
  public void clear() {
    Iterators.clear(cellSet().iterator());
  }

  @CanIgnoreReturnValue
  @Override

     * @param client The CrawlerClient instance.
     */
    public void addClient(final List<String> regexList, final CrawlerClient client) {
        if (regexList == null || regexList.isEmpty()) {
            throw new CrawlerSystemException("A regular expression list is null or empty.");
        }
        if (client == null) {
            throw new CrawlerSystemException("CrawlerClient is null.");
        }

            List<TaskSegment> taskSegments = lifecycleTaskSegmentCalculator.calculateTaskSegments(session);
            projectBuilds = buildListCalculator.calculateProjectBuilds(session, taskSegments);

            if (projectBuilds.isEmpty()) {
                throw new NoGoalSpecifiedException("No goals have been specified for this build."
                        + " You must specify a valid lifecycle phase or a goal in the format <plugin-prefix>:<goal> or"

    assertThat(future.isDone()).isFalse();
    assertThat(executedRunnables).isEmpty();
    assertThat(pendingRunnables).hasSize(1);
    pendingRunnables.remove(0).run();
    assertThat(future.isDone()).isTrue();
    assertThat(executedRunnables).containsExactly(runnable);
    assertThat(pendingRunnables).isEmpty();
  }

  public void testSubmit_runnable_throwsException() throws Exception {

    assertThat(future.isDone()).isFalse();
    assertThat(executedRunnables).isEmpty();
    assertThat(pendingRunnables).hasSize(1);
    pendingRunnables.remove(0).run();
    assertThat(future.isDone()).isTrue();
    assertThat(executedRunnables).containsExactly(runnable);
    assertThat(pendingRunnables).isEmpty();
  }

  public void testSubmit_runnable_throwsException() throws Exception {

        assertEquals(facetResponse, searchRenderData.getFacetResponse());
        assertNotNull(facetResponse.getQueryCountMap());
        assertTrue(facetResponse.getQueryCountMap().isEmpty());
    }

    @Test
    public void test_setAndGetAppendHighlightParams() {
        // Test with null
        searchRenderData.setAppendHighlightParams(null);

     * cache-control headers.
     */
    open fun cacheControl(cacheControl: CacheControl): Builder {
      val value = cacheControl.toString()
      return when {
        value.isEmpty() -> removeHeader("Cache-Control")
        else -> header("Cache-Control", value)
      }
    }

    open fun get(): Builder = method("GET", null)

    open fun head(): Builder = method("HEAD", null)

     * @throws CrawlingAccessException if access is denied
     */
    protected Blob getBlob(final String bucketName, final String path) {
        if (StringUtil.isEmpty(path)) {
            return null;
        }

        try {
            return storage.get(BlobId.of(bucketName, path));
        } catch (final StorageException e) {
            final int code = e.getCode();

      this.onBoth = unmodifiableMap(onBoth);
      this.differences = unmodifiableMap(differences);
    }

    @Override
    public boolean areEqual() {
      return onlyOnLeft.isEmpty() && onlyOnRight.isEmpty() && differences.isEmpty();
    }

    @Override
    public Map<K, V> entriesOnlyOnLeft() {
      return onlyOnLeft;
    }

    @Override
    public Map<K, V> entriesOnlyOnRight() {

      this.onBoth = unmodifiableMap(onBoth);
      this.differences = unmodifiableMap(differences);
    }

    @Override
    public boolean areEqual() {
      return onlyOnLeft.isEmpty() && onlyOnRight.isEmpty() && differences.isEmpty();
    }

    @Override
    public Map<K, V> entriesOnlyOnLeft() {
      return onlyOnLeft;
    }

    @Override
    public Map<K, V> entriesOnlyOnRight() {