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#pragma once
32
33#include "GCReachableRef.h"
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 {
44 WTF_MAKE_FAST_ALLOCATED;
45public:
46 MutationObserverRegistration(MutationObserver&, Node&, MutationObserverOptions, const HashSet<AtomicString>& attributeFilter);
47 ~MutationObserverRegistration();
48
49 void resetObservation(MutationObserverOptions, const HashSet<AtomicString>& attributeFilter);
50 void observedSubtreeNodeWillDetach(Node&);
51 std::unique_ptr<HashSet<GCReachableRef<Node>>> takeTransientRegistrations();
52 bool hasTransientRegistrations() const { return m_transientRegistrationNodes && !m_transientRegistrationNodes->isEmpty(); }
53
54 bool shouldReceiveMutationFrom(Node&, MutationObserver::MutationType, const QualifiedName* attributeName) const;
55 bool isSubtree() const { return m_options & MutationObserver::Subtree; }
56
57 MutationObserver& observer() { return m_observer.get(); }
58 Node& node() { return m_node; }
59 MutationRecordDeliveryOptions deliveryOptions() const { return m_options & (MutationObserver::AttributeOldValue | MutationObserver::CharacterDataOldValue); }
60 MutationObserverOptions mutationTypes() const { return m_options & MutationObserver::AllMutationTypes; }
61
62 void addRegistrationNodesToSet(HashSet<Node*>&) const;
63
64private:
65 Ref<MutationObserver> m_observer;
66 Node& m_node;
67 RefPtr<Node> m_nodeKeptAlive;
68 std::unique_ptr<HashSet<GCReachableRef<Node>>> m_transientRegistrationNodes;
69 MutationObserverOptions m_options;
70 HashSet<AtomicString> m_attributeFilter;
71};
72
73} // namespace WebCore
74