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