import java.util.TreeSet;

import static org.gradle.model.internal.core.ModelNode.State.Created;
import static org.gradle.model.internal.core.ModelNode.State.Discovered;
import static org.gradle.model.internal.core.ModelNode.State.GraphClosed;
import static org.gradle.model.internal.core.ModelNode.State.Registered;
import static org.gradle.model.internal.core.ModelNode.State.SelfClosed;

@NotThreadSafe

    @Override
    protected ModelView<M> toView(MutableModelNode modelNode, ModelRuleDescriptor ruleDescriptor, boolean writable) {
        M instance = Cast.uncheckedCast(modelNode.getPrivateData());
        return InstanceModelView.of(modelNode.getPath(), getType(), instance);
    }

    @Override
    public Optional<String> getValueDescription(MutableModelNode modelNode) {

    protected final ModelType<C> type;
    protected final MutableModelNode modelNode;
    protected final boolean overwritable;
    protected final DefaultModelViewState state;

    public ScalarCollectionModelView(ModelPath path, ModelType<C> type, ModelType<E> elementType, MutableModelNode modelNode, ModelRuleDescriptor descriptor, boolean overwritable, boolean mutable) {
        this.path = path;

            return null;
        }
    }

    private ModelView<P> toView(MutableModelNode modelNode, ModelRuleDescriptor ruleDescriptor, boolean mutable) {
        ChildNodeInitializerStrategy<? super E> creatorStrategy = creatorStrategyAccessor.getStrategy(modelNode);
        DefaultModelViewState state = new DefaultModelViewState(modelNode.getPath(), publicType, ruleDescriptor, mutable, !mutable);

        where:
        state                           | expected
        ModelNode.State.Registered      | null
        ModelNode.State.Discovered      | null
        ModelNode.State.Created         | "created"
        ModelNode.State.DefaultsApplied | ModelActionRole.Defaults.name()
        ModelNode.State.Initialized     | ModelActionRole.Initialize.name()
        ModelNode.State.Mutated         | ModelActionRole.Mutate.name()

                    public void execute(MutableModelNode modelNode) {
                        ChildNodeInitializerStrategyAccessor<E> strategyAccessor = ChildNodeInitializerStrategyAccessors.fromPrivateData();
                        Class<? extends T> implementationType = schema.getImplementationType().asSubclass(schema.getType().getConcreteClass());

            lss(CustomSourceSet)
        }
        """

        when:
        succeeds "model"

        then:
        def modelNode = ModelReportOutput.from(output).modelNode
        modelNode.lss.@creator[0] == "lss(CustomSourceSet) @ build.gradle line 13, column 13"
        modelNode.lss.@type[0] == "CustomSourceSet"
    }

    def "can create a LSS as property of a managed type"() {
        buildFile << """

    private final MutableModelNode sources;

    public BaseComponentSpec() {
        MutableModelNode modelNode = getInfo().modelNode;
        binaries = ModelMaps.addModelMapNode(modelNode, BINARY_SPEC_MODEL_TYPE, "binaries");
        sources = ModelMaps.addModelMapNode(modelNode, LANGUAGE_SOURCE_SET_MODEL_TYPE, "sources");
    }

    @Override
    public ModelMap<LanguageSourceSet> getSources() {

        project.fireDeferredConfiguration();
        if (modelNode != null) {
            project.getModelRegistry().atStateOrLater(modelNode.getPath(), ModelNode.State.SelfClosed);
        }
    }

    @Override
    public void prepareForExecution(Task task) {
        assert task.getProject() == project;
        if (modelNode != null && modelNode.hasLink(task.getName())) {

        Object getPrivateData() {
            return null
        }

        @Override
        void setTarget(ModelNode target) {

        }

        @Override
        void ensureUsable() {

        }

        @Override
        void ensureAtLeast(ModelNode.State state) {

        }

        @Override