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

    assertEquals(0, service.startUpCalled);
    assertEquals(0, service.shutDownCalled);
    assertEquals(Service.State.TERMINATED, service.state());
    assertThat(service.transitionStates).isEmpty();
  }

  public void testStop_afterStart() {
    TestService service = new TestService();
    service.startAsync().awaitRunning();
    assertEquals(1, service.startUpCalled);

   * SortedMultiset#contains}, {@link SortedMultiset#containsAll}, {@link SortedMultiset#count},
   * {@link SortedMultiset#firstEntry} {@link SortedMultiset#headMultiset}, {@link
   * SortedMultiset#isEmpty}, {@link SortedMultiset#lastEntry}, {@link SortedMultiset#subMultiset},
   * {@link SortedMultiset#tailMultiset}, the {@code size()} and {@code iterator()} methods of

   * Range#contains(Comparable) range.contains(k)}, then {@link #get(Comparable) get(k)} will return
   * {@code value}.
   *
   * <p>If {@code range} {@linkplain Range#isEmpty() is empty}, then this is a no-op.
   */
  void put(Range<K> range, V value);

  /**
   * Maps a range to a specified value, coalescing this range with any existing ranges with the same

        Element modelVersionElement = root.child(MODEL_VERSION).orElse(null);
        if (modelVersionElement != null) {
            String modelVersion = modelVersionElement.textContentTrimmed();
            if (!modelVersion.isEmpty()) {
                return modelVersion;
            }
        }

        // Fallback to namespace URI detection
        String namespaceUri = root.namespaceDeclaration(null);

            request.getEventSpyDispatcher().onEvent(settingsResult);
        }

        populateFromSettings(request, settingsResult.getEffectiveSettings());

        if (!settingsResult.getProblems().isEmpty() && LOGGER.isWarnEnabled()) {
            LOGGER.warn("");
            LOGGER.warn("Some problems were encountered while building the effective settings");

        if (!typeDeclaration.isPublic()) {
            return;
        }
        ClassMetaData outerClass = classStack.isEmpty() ? null : getCurrentClass();
        String baseName = typeDeclaration.getNameAsString();
        String className = outerClass == null ? packageName + '.' + baseName : outerClass.getClassName() + '.' + baseName;

  }

  public void testLineReading() throws IOException {
    File temp = createTempFile();
    assertThat(Files.readFirstLine(temp, UTF_8)).isNull();
    assertTrue(Files.readLines(temp, UTF_8).isEmpty());

    PrintWriter w = new PrintWriter(Files.newWriter(temp, UTF_8));
    w.println("hello");
    w.println("");
    w.println(" world  ");
    w.println("");
    w.close();

   * SortedMultiset#contains}, {@link SortedMultiset#containsAll}, {@link SortedMultiset#count},
   * {@link SortedMultiset#firstEntry} {@link SortedMultiset#headMultiset}, {@link
   * SortedMultiset#isEmpty}, {@link SortedMultiset#lastEntry}, {@link SortedMultiset#subMultiset},
   * {@link SortedMultiset#tailMultiset}, the {@code size()} and {@code iterator()} methods of

                // ModelBuildingEx is thrown only on FATAL and ERROR severities, but we still can have WARNs
                // that may lead to unexpected build failure, log them
                if (!modelResult.getProblems().isEmpty()) {
                    List<ModelProblem> problems = modelResult.getProblems();
                    if (logger.isDebugEnabled()) {
                        String problem = (problems.size() == 1) ? "problem" : "problems";