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      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 "core/dom/Document.h"
     35 #include "core/dom/MutationObserver.h"
     36 #include "core/dom/Node.h"
     37 #include "core/dom/QualifiedName.h"
     38 #include "platform/heap/Handle.h"
     39 #include "wtf/HashMap.h"
     40 #include "wtf/PassOwnPtr.h"
     41 
     42 namespace WebCore {
     43 
     44 class MutationObserverInterestGroup FINAL : public NoBaseWillBeGarbageCollectedFinalized<MutationObserverInterestGroup> {
     45 public:
     46     static PassOwnPtrWillBeRawPtr<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 PassOwnPtrWillBeRawPtr<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 PassOwnPtrWillBeRawPtr<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(PassRefPtrWillBeRawPtr<MutationRecord>);
     73 
     74     void trace(Visitor*);
     75 
     76 private:
     77     static PassOwnPtrWillBeRawPtr<MutationObserverInterestGroup> createIfNeeded(Node& target, MutationObserver::MutationType, MutationRecordDeliveryOptions oldValueFlag, const QualifiedName* attributeName = 0);
     78     MutationObserverInterestGroup(WillBeHeapHashMap<RawPtrWillBeMember<MutationObserver>, MutationRecordDeliveryOptions>& observers, MutationRecordDeliveryOptions oldValueFlag);
     79 
     80     bool hasOldValue(MutationRecordDeliveryOptions options) { return options & m_oldValueFlag; }
     81 
     82     WillBeHeapHashMap<RawPtrWillBeMember<MutationObserver>, MutationRecordDeliveryOptions> m_observers;
     83     MutationRecordDeliveryOptions m_oldValueFlag;
     84 };
     85 
     86 }
     87 
     88 #endif // MutationObserverInterestGroup_h
     89