import java.util.Map;

public abstract class AbstractPolymorphicDomainObjectContainer<T>
        extends AbstractNamedDomainObjectContainer<T> implements PolymorphicDomainObjectContainerInternal<T> {

    private final ContainerElementsDynamicObject elementsDynamicObject = new ContainerElementsDynamicObject();

    private final Class<U> type;
    private final AbstractPolymorphicDomainObjectContainer<? super U> parent;

    public TypedDomainObjectContainerWrapper(Class<U> type, AbstractPolymorphicDomainObjectContainer<? super U> parent) {
        super(parent.withType(type));
        this.parent = parent;
        this.type = type;
    }

    @Override

    def setup() {
        container = instantiator.newInstance(PolymorphicTestContainer.class, instantiator, collectionCallbackActionDecorator)
    }
}

class PolymorphicTestContainer extends AbstractPolymorphicDomainObjectContainer<TestObject> {
    PolymorphicTestContainer(Instantiator instantiator, CollectionCallbackActionDecorator collectionCallbackActionDecorator) {

import org.gradle.internal.reflect.Instantiator;
import org.gradle.model.internal.core.NamedEntityInstantiator;

import java.util.Set;

public class DefaultPolymorphicDomainObjectContainer<T> extends AbstractPolymorphicDomainObjectContainer<T>
    implements ExtensiblePolymorphicDomainObjectContainer<T> {
    protected final DefaultPolymorphicNamedEntityInstantiator<T> namedEntityInstantiator;
    private final Instantiator elementInstantiator;