ImmutableGraph<String> graph = GraphBuilder.directed().<String>immutable().addNode("A").build();

    assertThat(graph.nodes()).containsExactly("A");
    assertThat(graph.edges()).isEmpty();
  }

  @Test
  public void immutableGraphBuilder_putEdgeFromNodes() {
    ImmutableGraph<String> graph =
        GraphBuilder.directed().<String>immutable().putEdge("A", "B").build();

                avgThreadTimeMs);

        // Verify performance improvements
        assertTrue(exceptions.isEmpty(), "No exceptions should occur during concurrent access");
        assertEquals(threadCount * operationsPerThread, successCount.get());

    multimapView.clear();
    assertFalse(multimapView.containsKey("foo"));
    assertFalse(map.containsKey("foo"));
    assertTrue(map.isEmpty());
    assertTrue(multimapView.isEmpty());
    multimap.clear();
    assertEquals(multimap.toString(), multimapView.toString());
    assertEquals(multimap.hashCode(), multimapView.hashCode());

            buf.append(",\"related_contents\":");
            buf.append(escapeJson(relatedContents));
            buf.append(',');
            buf.append("\"data\":[");
            if (!documentItems.isEmpty()) {
                boolean first1 = true;
                for (final Map<String, Object> document : documentItems) {
                    if (!first1) {
                        buf.append(',');

    public static MavenOptions layerMavenOptions(Collection<MavenOptions> options) {
        List<MavenOptions> o = options.stream().filter(Objects::nonNull).toList();
        if (o.isEmpty()) {
            throw new IllegalArgumentException("No options specified (or all were null)");
        } else if (o.size() == 1) {
            return o.get(0);
        } else {

        List<Expression> expressions = documentation.getExpressions();

        Map<String, Expression> bySyntax = new HashMap<>();

        if (expressions != null && !expressions.isEmpty()) {
            for (Expression expression : expressions) {
                bySyntax.put(expression.getSyntax(), expression);
            }
        }

        return bySyntax;
    }

        final ListResultBean<FileConfig> list = fileConfigBhv.selectList(cb -> {
            cb.query().setName_Equal(name);
            cb.query().addOrderBy_SortOrder_Asc();
        });
        if (list.isEmpty()) {
            return OptionalEntity.empty();
        }
        return OptionalEntity.of(list.get(0));
    }

    /**
     * Stores a file configuration in the database.

        getDocumentationRoot().getAsFileTree().matching(spec -> spec.include("**/*.adoc")).forEach(file -> {
            gatherBadSnippetsInFile(file, errors);
        });

        if (!errors.isEmpty()) {
            StringBuilder sb = new StringBuilder("Found reversed multi-language snippet order in AsciiDoc files:\n");
            for (Map.Entry<File, List<Error>> e : errors.entrySet()) {

                .stream()
                .map(MavenProject::getVersion)
                .collect(Collectors.collectingAndThen(Collectors.toList(), Collections::unmodifiableList));
        if (!versions.isEmpty()) {
            return versions;
        }
        return getAllProjects()
                .getOrDefault(artifact.getGroupId(), Collections.emptyMap())

      stackWithLastReturnedElementAtTop = null;
    }

    @Override
    public boolean hasNext() {
      return !nextElements.isEmpty();
    }

    @Override
    public boolean hasPrevious() {
      return !previousElements.isEmpty();
    }

    @Override
    public E next() {
      return transferElement(nextElements, previousElements);
    }

    @Override