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

    private final ContainerElementsDynamicObject elementsDynamicObject = new ContainerElementsDynamicObject();

    protected AbstractPolymorphicDomainObjectContainer(Class<T> type, Instantiator instantiator, Namer<? super T> namer, CollectionCallbackActionDecorator callbackDecorator) {

    private final Instantiator instantiator;
    private final Namer<? super T> namer;
    protected final Index<T> index;

    private final ContainerElementsDynamicObject elementsDynamicObject = new ContainerElementsDynamicObject();

    private final List<Rule> rules = new ArrayList<Rule>();
    private final Set<String> applyingRulesFor = new HashSet<String>();