/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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 * contributors may be used to endorse or promote products derived from
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 *
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#ifndef MutationObserverRegistration_h
#define MutationObserverRegistration_h

#if ENABLE(MUTATION_OBSERVERS)

#include "WebKitMutationObserver.h"
#include <wtf/HashSet.h>
#include <wtf/text/AtomicString.h>
#include <wtf/text/AtomicStringHash.h>

namespace WebCore {

class MutationObserverRegistration {
public:

    static PassOwnPtr<MutationObserverRegistration> create(PassRefPtr<WebKitMutationObserver>, Node*);

    ~MutationObserverRegistration();

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

    bool shouldReceiveMutationFrom(Node*, WebKitMutationObserver::MutationType, const AtomicString& attributeName);
    bool inline isSubtree() const { return m_options & WebKitMutationObserver::Subtree; }

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

private:
    MutationObserverRegistration(PassRefPtr<WebKitMutationObserver>, Node*);

    const HashSet<AtomicString>& caseInsensitiveAttributeFilter();

    RefPtr<WebKitMutationObserver> m_observer;
    Node* m_registrationNode;
    RefPtr<Node> m_registrationNodeKeepAlive;
    typedef HashSet<RefPtr<Node> > NodeHashSet;
    OwnPtr<NodeHashSet> m_transientRegistrationNodes;

    MutationObserverOptions m_options;
    HashSet<AtomicString> m_attributeFilter;
    OwnPtr<HashSet<AtomicString> > m_caseInsensitiveAttributeFilter;
};

} // namespace WebCore

#endif // ENABLE(MUTATION_OBSERVERS)

#endif // MutationObserverRegistration_h
