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
37 namespace WebCore {
38
createIfNeeded(Node & target,MutationObserver::MutationType type,MutationRecordDeliveryOptions oldValueFlag,const QualifiedName * attributeName)39 PassOwnPtr<MutationObserverInterestGroup> MutationObserverInterestGroup::createIfNeeded(Node& target, MutationObserver::MutationType type, MutationRecordDeliveryOptions oldValueFlag, const QualifiedName* attributeName)
40 {
41 ASSERT((type == MutationObserver::Attributes && attributeName) || !attributeName);
42 HashMap<MutationObserver*, MutationRecordDeliveryOptions> observers;
43 target.getRegisteredMutationObserversOfType(observers, type, attributeName);
44 if (observers.isEmpty())
45 return nullptr;
46
47 return adoptPtr(new MutationObserverInterestGroup(observers, oldValueFlag));
48 }
49
MutationObserverInterestGroup(HashMap<MutationObserver *,MutationRecordDeliveryOptions> & observers,MutationRecordDeliveryOptions oldValueFlag)50 MutationObserverInterestGroup::MutationObserverInterestGroup(HashMap<MutationObserver*, MutationRecordDeliveryOptions>& observers, MutationRecordDeliveryOptions oldValueFlag)
51 : m_oldValueFlag(oldValueFlag)
52 {
53 ASSERT(!observers.isEmpty());
54 m_observers.swap(observers);
55 }
56
isOldValueRequested()57 bool MutationObserverInterestGroup::isOldValueRequested()
58 {
59 for (HashMap<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
enqueueMutationRecord(PassRefPtr<MutationRecord> prpMutation)66 void MutationObserverInterestGroup::enqueueMutationRecord(PassRefPtr<MutationRecord> prpMutation)
67 {
68 RefPtr<MutationRecord> mutation = prpMutation;
69 RefPtr<MutationRecord> mutationWithNullOldValue;
70 for (HashMap<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
86 } // namespace WebCore
87