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 MutationObserverInterestGroup_h
32#define MutationObserverInterestGroup_h
33
34#include "core/dom/Document.h"
35#include "core/dom/MutationObserver.h"
36#include "core/dom/Node.h"
37#include "core/dom/QualifiedName.h"
38#include "platform/heap/Handle.h"
39#include "wtf/HashMap.h"
40#include "wtf/PassOwnPtr.h"
41
42namespace blink {
43
44class MutationObserverInterestGroup FINAL : public NoBaseWillBeGarbageCollectedFinalized<MutationObserverInterestGroup> {
45public:
46    static PassOwnPtrWillBeRawPtr<MutationObserverInterestGroup> createForChildListMutation(Node& target)
47    {
48        if (!target.document().hasMutationObserversOfType(MutationObserver::ChildList))
49            return nullptr;
50
51        MutationRecordDeliveryOptions oldValueFlag = 0;
52        return createIfNeeded(target, MutationObserver::ChildList, oldValueFlag);
53    }
54
55    static PassOwnPtrWillBeRawPtr<MutationObserverInterestGroup> createForCharacterDataMutation(Node& target)
56    {
57        if (!target.document().hasMutationObserversOfType(MutationObserver::CharacterData))
58            return nullptr;
59
60        return createIfNeeded(target, MutationObserver::CharacterData, MutationObserver::CharacterDataOldValue);
61    }
62
63    static PassOwnPtrWillBeRawPtr<MutationObserverInterestGroup> createForAttributesMutation(Node& target, const QualifiedName& attributeName)
64    {
65        if (!target.document().hasMutationObserversOfType(MutationObserver::Attributes))
66            return nullptr;
67
68        return createIfNeeded(target, MutationObserver::Attributes, MutationObserver::AttributeOldValue, &attributeName);
69    }
70
71    bool isOldValueRequested();
72    void enqueueMutationRecord(PassRefPtrWillBeRawPtr<MutationRecord>);
73
74    void trace(Visitor*);
75
76private:
77    static PassOwnPtrWillBeRawPtr<MutationObserverInterestGroup> createIfNeeded(Node& target, MutationObserver::MutationType, MutationRecordDeliveryOptions oldValueFlag, const QualifiedName* attributeName = 0);
78    MutationObserverInterestGroup(WillBeHeapHashMap<RawPtrWillBeMember<MutationObserver>, MutationRecordDeliveryOptions>& observers, MutationRecordDeliveryOptions oldValueFlag);
79
80    bool hasOldValue(MutationRecordDeliveryOptions options) { return options & m_oldValueFlag; }
81
82    WillBeHeapHashMap<RawPtrWillBeMember<MutationObserver>, MutationRecordDeliveryOptions> m_observers;
83    MutationRecordDeliveryOptions m_oldValueFlag;
84};
85
86}
87
88#endif // MutationObserverInterestGroup_h
89