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#include "config.h"
32
33#include "MutationObserverInterestGroup.h"
34
35#include "MutationObserverRegistration.h"
36#include "MutationRecord.h"
37
38namespace WebCore {
39
40inline MutationObserverInterestGroup::MutationObserverInterestGroup(HashMap<Ref<MutationObserver>, MutationRecordDeliveryOptions>&& observers, MutationRecordDeliveryOptions oldValueFlag)
41 : m_observers(WTFMove(observers))
42 , m_oldValueFlag(oldValueFlag)
43{
44 ASSERT(!m_observers.isEmpty());
45}
46
47std::unique_ptr<MutationObserverInterestGroup> MutationObserverInterestGroup::createIfNeeded(Node& target, MutationObserver::MutationType type, MutationRecordDeliveryOptions oldValueFlag, const QualifiedName* attributeName)
48{
49 ASSERT((type == MutationObserver::Attributes && attributeName) || !attributeName);
50 auto observers = target.registeredMutationObservers(type, attributeName);
51 if (observers.isEmpty())
52 return nullptr;
53
54 return std::make_unique<MutationObserverInterestGroup>(WTFMove(observers), oldValueFlag);
55}
56
57bool MutationObserverInterestGroup::isOldValueRequested() const
58{
59 for (auto options : m_observers.values()) {
60 if (hasOldValue(options))
61 return true;
62 }
63 return false;
64}
65
66void MutationObserverInterestGroup::enqueueMutationRecord(Ref<MutationRecord>&& mutation)
67{
68 RefPtr<MutationRecord> mutationWithNullOldValue;
69 for (auto& observerOptionsPair : m_observers) {
70 auto& observer = observerOptionsPair.key.get();
71 if (hasOldValue(observerOptionsPair.value)) {
72 observer.enqueueMutationRecord(mutation.copyRef());
73 continue;
74 }
75 if (!mutationWithNullOldValue) {
76 if (mutation->oldValue().isNull())
77 mutationWithNullOldValue = mutation.ptr();
78 else
79 mutationWithNullOldValue = MutationRecord::createWithNullOldValue(mutation).ptr();
80 }
81 observer.enqueueMutationRecord(*mutationWithNullOldValue);
82 }
83}
84
85} // namespace WebCore
86