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 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 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 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 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