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 "Document.h"
34#include "MutationObserver.h"
35#include <memory>
36#include <wtf/HashMap.h>
37
38namespace WebCore {
39
40class QualifiedName;
41
42class MutationObserverInterestGroup {
43 WTF_MAKE_FAST_ALLOCATED;
44public:
45 MutationObserverInterestGroup(HashMap<Ref<MutationObserver>, MutationRecordDeliveryOptions>&&, MutationRecordDeliveryOptions);
46
47 static std::unique_ptr<MutationObserverInterestGroup> createForChildListMutation(Node& target)
48 {
49 if (!target.document().hasMutationObserversOfType(MutationObserver::ChildList))
50 return nullptr;
51
52 MutationRecordDeliveryOptions oldValueFlag = 0;
53 return createIfNeeded(target, MutationObserver::ChildList, oldValueFlag);
54 }
55
56 static std::unique_ptr<MutationObserverInterestGroup> createForCharacterDataMutation(Node& target)
57 {
58 if (!target.document().hasMutationObserversOfType(MutationObserver::CharacterData))
59 return nullptr;
60
61 return createIfNeeded(target, MutationObserver::CharacterData, MutationObserver::CharacterDataOldValue);
62 }
63
64 static std::unique_ptr<MutationObserverInterestGroup> createForAttributesMutation(Node& target, const QualifiedName& attributeName)
65 {
66 if (!target.document().hasMutationObserversOfType(MutationObserver::Attributes))
67 return nullptr;
68
69 return createIfNeeded(target, MutationObserver::Attributes, MutationObserver::AttributeOldValue, &attributeName);
70 }
71
72 bool isOldValueRequested() const;
73 void enqueueMutationRecord(Ref<MutationRecord>&&);
74
75private:
76 static std::unique_ptr<MutationObserverInterestGroup> createIfNeeded(Node& target, MutationObserver::MutationType, MutationRecordDeliveryOptions oldValueFlag, const QualifiedName* attributeName = nullptr);
77
78 bool hasOldValue(MutationRecordDeliveryOptions options) const { return options & m_oldValueFlag; }
79
80 HashMap<Ref<MutationObserver>, MutationRecordDeliveryOptions> m_observers;
81 MutationRecordDeliveryOptions m_oldValueFlag;
82};
83
84} // namespace WebCore
85