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 "core/dom/MutationObserverInterestGroup.h"
34
35#include "core/dom/MutationRecord.h"
36
37namespace blink {
38
39PassOwnPtrWillBeRawPtr<MutationObserverInterestGroup> MutationObserverInterestGroup::createIfNeeded(Node& target, MutationObserver::MutationType type, MutationRecordDeliveryOptions oldValueFlag, const QualifiedName* attributeName)
40{
41    ASSERT((type == MutationObserver::Attributes && attributeName) || !attributeName);
42    WillBeHeapHashMap<RawPtrWillBeMember<MutationObserver>, MutationRecordDeliveryOptions> observers;
43    target.getRegisteredMutationObserversOfType(observers, type, attributeName);
44    if (observers.isEmpty())
45        return nullptr;
46
47    return adoptPtrWillBeNoop(new MutationObserverInterestGroup(observers, oldValueFlag));
48}
49
50MutationObserverInterestGroup::MutationObserverInterestGroup(WillBeHeapHashMap<RawPtrWillBeMember<MutationObserver>, MutationRecordDeliveryOptions>& observers, MutationRecordDeliveryOptions oldValueFlag)
51    : m_oldValueFlag(oldValueFlag)
52{
53    ASSERT(!observers.isEmpty());
54    m_observers.swap(observers);
55}
56
57bool MutationObserverInterestGroup::isOldValueRequested()
58{
59    for (WillBeHeapHashMap<RawPtrWillBeMember<MutationObserver>, MutationRecordDeliveryOptions>::iterator iter = m_observers.begin(); iter != m_observers.end(); ++iter) {
60        if (hasOldValue(iter->value))
61            return true;
62    }
63    return false;
64}
65
66void MutationObserverInterestGroup::enqueueMutationRecord(PassRefPtrWillBeRawPtr<MutationRecord> prpMutation)
67{
68    RefPtrWillBeRawPtr<MutationRecord> mutation = prpMutation;
69    RefPtrWillBeRawPtr<MutationRecord> mutationWithNullOldValue = nullptr;
70    for (WillBeHeapHashMap<RawPtrWillBeMember<MutationObserver>, MutationRecordDeliveryOptions>::iterator iter = m_observers.begin(); iter != m_observers.end(); ++iter) {
71        MutationObserver* observer = iter->key;
72        if (hasOldValue(iter->value)) {
73            observer->enqueueMutationRecord(mutation);
74            continue;
75        }
76        if (!mutationWithNullOldValue) {
77            if (mutation->oldValue().isNull())
78                mutationWithNullOldValue = mutation;
79            else
80                mutationWithNullOldValue = MutationRecord::createWithNullOldValue(mutation).get();
81        }
82        observer->enqueueMutationRecord(mutationWithNullOldValue);
83    }
84}
85
86void MutationObserverInterestGroup::trace(Visitor* visitor)
87{
88#if ENABLE(OILPAN)
89    visitor->trace(m_observers);
90#endif
91}
92
93} // namespace blink
94