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#ifndef MutationObserverInterestGroup_h 32#define MutationObserverInterestGroup_h 33 34#include "Document.h" 35#include "MutationObserver.h" 36#include "QualifiedName.h" 37#include <memory> 38#include <wtf/HashMap.h> 39 40namespace WebCore { 41 42class MutationObserverInterestGroup { 43public: 44 MutationObserverInterestGroup(HashMap<MutationObserver*, MutationRecordDeliveryOptions>& observers, MutationRecordDeliveryOptions oldValueFlag); 45 46 static std::unique_ptr<MutationObserverInterestGroup> createForChildListMutation(Node& target) 47 { 48 if (!target.document().hasMutationObserversOfType(MutationObserver::ChildList)) 49 return nullptr; 50 51 MutationRecordDeliveryOptions oldValueFlag = 0; 52 return createIfNeeded(target, MutationObserver::ChildList, oldValueFlag); 53 } 54 55 static std::unique_ptr<MutationObserverInterestGroup> createForCharacterDataMutation(Node& target) 56 { 57 if (!target.document().hasMutationObserversOfType(MutationObserver::CharacterData)) 58 return nullptr; 59 60 return createIfNeeded(target, MutationObserver::CharacterData, MutationObserver::CharacterDataOldValue); 61 } 62 63 static std::unique_ptr<MutationObserverInterestGroup> createForAttributesMutation(Node& target, const QualifiedName& attributeName) 64 { 65 if (!target.document().hasMutationObserversOfType(MutationObserver::Attributes)) 66 return nullptr; 67 68 return createIfNeeded(target, MutationObserver::Attributes, MutationObserver::AttributeOldValue, &attributeName); 69 } 70 71 bool isOldValueRequested(); 72 void enqueueMutationRecord(PassRefPtr<MutationRecord>); 73 74private: 75 static std::unique_ptr<MutationObserverInterestGroup> createIfNeeded(Node& target, MutationObserver::MutationType, MutationRecordDeliveryOptions oldValueFlag, const QualifiedName* attributeName = nullptr); 76 77 bool hasOldValue(MutationRecordDeliveryOptions options) { return options & m_oldValueFlag; } 78 79 HashMap<MutationObserver*, MutationRecordDeliveryOptions> m_observers; 80 MutationRecordDeliveryOptions m_oldValueFlag; 81}; 82 83} 84 85#endif // MutationObserverInterestGroup_h 86