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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 #include "config.h"
     32 
     33 #include "core/dom/MutationObserverInterestGroup.h"
     34 
     35 #include "core/dom/MutationRecord.h"
     36 #include "core/dom/Node.h"
     37 #include "core/dom/QualifiedName.h"
     38 
     39 namespace WebCore {
     40 
     41 PassOwnPtr<MutationObserverInterestGroup> MutationObserverInterestGroup::createIfNeeded(Node* target, MutationObserver::MutationType type, MutationRecordDeliveryOptions oldValueFlag, const QualifiedName* attributeName)
     42 {
     43     ASSERT((type == MutationObserver::Attributes && attributeName) || !attributeName);
     44     HashMap<MutationObserver*, MutationRecordDeliveryOptions> observers;
     45     target->getRegisteredMutationObserversOfType(observers, type, attributeName);
     46     if (observers.isEmpty())
     47         return nullptr;
     48 
     49     return adoptPtr(new MutationObserverInterestGroup(observers, oldValueFlag));
     50 }
     51 
     52 MutationObserverInterestGroup::MutationObserverInterestGroup(HashMap<MutationObserver*, MutationRecordDeliveryOptions>& observers, MutationRecordDeliveryOptions oldValueFlag)
     53     : m_oldValueFlag(oldValueFlag)
     54 {
     55     ASSERT(!observers.isEmpty());
     56     m_observers.swap(observers);
     57 }
     58 
     59 bool MutationObserverInterestGroup::isOldValueRequested()
     60 {
     61     for (HashMap<MutationObserver*, MutationRecordDeliveryOptions>::iterator iter = m_observers.begin(); iter != m_observers.end(); ++iter) {
     62         if (hasOldValue(iter->value))
     63             return true;
     64     }
     65     return false;
     66 }
     67 
     68 void MutationObserverInterestGroup::enqueueMutationRecord(PassRefPtr<MutationRecord> prpMutation)
     69 {
     70     RefPtr<MutationRecord> mutation = prpMutation;
     71     RefPtr<MutationRecord> mutationWithNullOldValue;
     72     for (HashMap<MutationObserver*, MutationRecordDeliveryOptions>::iterator iter = m_observers.begin(); iter != m_observers.end(); ++iter) {
     73         MutationObserver* observer = iter->key;
     74         if (hasOldValue(iter->value)) {
     75             observer->enqueueMutationRecord(mutation);
     76             continue;
     77         }
     78         if (!mutationWithNullOldValue) {
     79             if (mutation->oldValue().isNull())
     80                 mutationWithNullOldValue = mutation;
     81             else
     82                 mutationWithNullOldValue = MutationRecord::createWithNullOldValue(mutation).get();
     83         }
     84         observer->enqueueMutationRecord(mutationWithNullOldValue);
     85     }
     86 }
     87 
     88 } // namespace WebCore
     89