1/*
2 * Copyright (C) 2011 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#ifndef MutationObserverRegistration_h
32#define MutationObserverRegistration_h
33
34#include "MutationObserver.h"
35#include <wtf/HashSet.h>
36#include <wtf/text/AtomicString.h>
37#include <wtf/text/AtomicStringHash.h>
38
39namespace WebCore {
40
41class QualifiedName;
42
43class MutationObserverRegistration {
44public:
45    static PassOwnPtr<MutationObserverRegistration> create(PassRefPtr<MutationObserver>, Node*, MutationObserverOptions, const HashSet<AtomicString>& attributeFilter);
46    ~MutationObserverRegistration();
47
48    void resetObservation(MutationObserverOptions, const HashSet<AtomicString>& attributeFilter);
49    void observedSubtreeNodeWillDetach(Node*);
50    void clearTransientRegistrations();
51    bool hasTransientRegistrations() const { return m_transientRegistrationNodes && !m_transientRegistrationNodes->isEmpty(); }
52    static void unregisterAndDelete(MutationObserverRegistration*);
53
54    bool shouldReceiveMutationFrom(Node*, MutationObserver::MutationType, const QualifiedName* attributeName) const;
55    bool isSubtree() const { return m_options & MutationObserver::Subtree; }
56
57    MutationObserver* observer() const { return m_observer.get(); }
58    MutationRecordDeliveryOptions deliveryOptions() const { return m_options & (MutationObserver::AttributeOldValue | MutationObserver::CharacterDataOldValue); }
59    MutationObserverOptions mutationTypes() const { return m_options & MutationObserver::AllMutationTypes; }
60
61    void addRegistrationNodesToSet(HashSet<Node*>&) const;
62
63private:
64    MutationObserverRegistration(PassRefPtr<MutationObserver>, Node*, MutationObserverOptions, const HashSet<AtomicString>& attributeFilter);
65
66    RefPtr<MutationObserver> m_observer;
67    Node* m_registrationNode;
68    RefPtr<Node> m_registrationNodeKeepAlive;
69    typedef HashSet<RefPtr<Node>> NodeHashSet;
70    OwnPtr<NodeHashSet> m_transientRegistrationNodes;
71
72    MutationObserverOptions m_options;
73    HashSet<AtomicString> m_attributeFilter;
74};
75
76} // namespace WebCore
77
78#endif // MutationObserverRegistration_h
79