third_party/WebKit/Source/core/dom/MutationObserverRegistration.h

/*
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#ifndef MutationObserverRegistration_h
#define MutationObserverRegistration_h

#include "core/dom/MutationObserver.h"
#include "platform/heap/Handle.h"
#include "wtf/HashSet.h"
#include "wtf/text/AtomicString.h"
#include "wtf/text/AtomicStringHash.h"

namespace blink {

class QualifiedName;

class MutationObserverRegistration final : public GarbageCollectedFinalized<MutationObserverRegistration> {
public:
    static MutationObserverRegistration* create(MutationObserver&, Node*, MutationObserverOptions, const HashSet<AtomicString>& attributeFilter);
    ~MutationObserverRegistration();

    void resetObservation(MutationObserverOptions, const HashSet<AtomicString>& attributeFilter);
    void observedSubtreeNodeWillDetach(Node&);
    void clearTransientRegistrations();
    bool hasTransientRegistrations() const { return m_transientRegistrationNodes && !m_transientRegistrationNodes->isEmpty(); }
    void unregister();

    bool shouldReceiveMutationFrom(Node&, MutationObserver::MutationType, const QualifiedName* attributeName) const;
    bool isSubtree() const { return m_options & MutationObserver::Subtree; }

    MutationObserver& observer() const { return *m_observer; }
    MutationRecordDeliveryOptions deliveryOptions() const { return m_options & (MutationObserver::AttributeOldValue | MutationObserver::CharacterDataOldValue); }
    MutationObserverOptions mutationTypes() const { return m_options & MutationObserver::AllMutationTypes; }

    void addRegistrationNodesToSet(HeapHashSet<Member<Node>>&) const;

    DECLARE_TRACE();

    DECLARE_TRACE_WRAPPERS();

    void dispose();

private:
    MutationObserverRegistration(MutationObserver&, Node*, MutationObserverOptions, const HashSet<AtomicString>& attributeFilter);

    Member<MutationObserver> m_observer;
    WeakMember<Node> m_registrationNode;
    Member<Node> m_registrationNodeKeepAlive;
    typedef HeapHashSet<Member<Node>> NodeHashSet;
    Member<NodeHashSet> m_transientRegistrationNodes;

    MutationObserverOptions m_options;
    HashSet<AtomicString> m_attributeFilter;
};

} // namespace blink

#endif // MutationObserverRegistration_h