packages.getOrPut(currentPackage) { mutableSetOf() } += subPackage
                currentPackage = currentPackage.child(subPackage)
            }
            packages.computeIfAbsent(currentPackage) { mutableSetOf() }
        }
        packages
    }

    override fun doesKotlinOnlyPackageExist(packageFqName: FqName): Boolean {

        vFrom.setCompareScope(scopedVertices);

        List<MetadataGraphEdge> exList = excidentEdges.computeIfAbsent(vFrom, k -> new ArrayList<>());

        if (!exList.contains(e)) {
            exList.add(e);
        }

        List<MetadataGraphEdge> inList = incidentEdges.computeIfAbsent(vTo, k -> new ArrayList<>());

        if (!inList.contains(e)) {
            inList.add(e);
        }

    public DefaultSuperPomProvider(ModelProcessor modelProcessor) {
        this.modelProcessor = modelProcessor;
    }

    @Override
    public Model getSuperPom(String version) {
        return SUPER_MODELS.computeIfAbsent(Objects.requireNonNull(version), v -> readModel(version, v));
    }

    private Model readModel(String version, String v) {
        String resource = "/org/apache/maven/model/pom-" + v + ".xml";

                allHandlers.clear();
            }
        }
    }

    @Override
    public ArtifactHandler getArtifactHandler(String id) {
        return allHandlers.computeIfAbsent(id, k -> {
            Type type = typeRegistry.require(id);
            return new DefaultArtifactHandler(
                    id,
                    type.getExtension(),
                    type.getClassifier(),

        lifecycle.phases().forEach(phase -> phase.plugins()
                .forEach(plugin -> plugin.getExecutions().forEach(exec -> exec.getGoals()
                        .forEach(goal -> goals.computeIfAbsent(phase.name(), n -> new ArrayList<>())
                                .add(plugin.getGroupId() + ":" + plugin.getArtifactId() + ":" + plugin.getVersion()
                                        + ":" + goal)))));

     */
    class DependencyCache {
        private final Map<String, DefaultLocalConfigurationMetadataBuilder.DependencyState> cache = new HashMap<>();

        public DefaultLocalConfigurationMetadataBuilder.DependencyState computeIfAbsent(
            ConfigurationInternal configuration,
            Function<ConfigurationInternal, DependencyState> factory
        ) {
            DependencyState state = cache.get(configuration.getName());

        ConfigurationInternal configurationInternal = (ConfigurationInternal) configuration;
        Set<TaskProvider<COMPILE>> compileTasks = Cast.uncheckedCast(configurationToCompileTasks.computeIfAbsent(configurationInternal, key -> new HashSet<>()));
        compileTasks.add(compileTask);

        JavaPluginExtension java = project.getExtensions().getByType(JavaPluginExtension.class);

    public Optional<Type> lookup(String id) {
        return Optional.of(require(id));
    }

    @Override
    @Nonnull
    public Type require(String id) {
        nonNull(id, "id");
        return usedTypes.computeIfAbsent(id, i -> {
            Type type = types.get(id);
            if (type == null) {
                // Copy data as the ArtifactHandler is not immutable, but Type should be.

        ModuleComponentRepository<?> sourceRepository = findSourceRepository(component.getSources());
        ResolvableArtifact resolvableArtifact = sourceRepository.getArtifactCache().computeIfAbsent(artifact.getId(), id -> {
            CalculatedValue<File> artifactSource = calculatedValueFactory.create(Describables.of(artifact.getId()), () -> resolveArtifactLater(artifact, component.getSources(), sourceRepository));

            .map(PluginId::getId)
            .orElseGet { pluginClass.name }
        val pluginJar = findPluginJar(pluginClass)
        if (pluginJar != null) {
            jarsByPlugin.computeIfAbsent(pluginId) { firstSeenPlugin -> registerValidationTaskForNewPlugin(firstSeenPlugin, project, lifecycleTask) }
                .add(pluginJar)
        } else {