registry.registerFactory(type, factory, descriptor);
    }

    @Override
    public Set<? extends Class<? extends T>> getCreatableTypes() {
        return instantiator.getCreatableTypes();
    }

    @Override
    public <U extends T> void registerFactory(Class<U> type, NamedDomainObjectFactory<? extends U> factory) {
        registry.registerFactory(type, factory);
    }

        this.baseItemModelType = baseItemModelType;
        this.managed = managed;
        this.creatorStrategyAccessor = creatorStrategyAccessor;
    }

    private Collection<? extends Class<?>> getCreatableTypes() {
        return Collections.singleton(baseItemModelType.getConcreteClass());
    }

    private String getContainerTypeDescription(Class<?> containerType, Collection<? extends Class<?>> creatableTypes) {

import java.util.Set;

public interface PolymorphicNamedEntityInstantiator<T> extends NamedEntityInstantiator<T>, NamedDomainObjectFactoryRegistry<T> {
    Set<? extends Class<? extends T>> getCreatableTypes();

        }
        factories.put(type, factory);
    }

    @Override
    public Set<? extends Class<? extends T>> getCreatableTypes() {
        return ImmutableSet.copyOf(factories.keySet());
    }

            }
        });
    }

    @Override
    public Set<? extends Class<? extends T>> getCreateableTypes() {
        return namedEntityInstantiator.getCreatableTypes();
    }

                registrations.execute(new PolymorphicNamedEntityInstantiator<I>() {
                    @Override
                    public Set<? extends Class<? extends I>> getCreatableTypes() {
                        return instantiator.getCreatableTypes();
                    }

                    @Override
                    public <U extends I> void registerFactory(Class<U> type, NamedDomainObjectFactory<? extends U> factory) {