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      1 /*
      2  * Copyright (C) 2012 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
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "core/dom/IdTargetObserverRegistry.h"
     28 
     29 #include "core/dom/IdTargetObserver.h"
     30 
     31 namespace blink {
     32 
     33 PassOwnPtrWillBeRawPtr<IdTargetObserverRegistry> IdTargetObserverRegistry::create()
     34 {
     35     return adoptPtrWillBeNoop(new IdTargetObserverRegistry());
     36 }
     37 
     38 void IdTargetObserverRegistry::trace(Visitor* visitor)
     39 {
     40 #if ENABLE(OILPAN)
     41     visitor->trace(m_registry);
     42     visitor->trace(m_notifyingObserversInSet);
     43 #endif
     44 }
     45 
     46 void IdTargetObserverRegistry::addObserver(const AtomicString& id, IdTargetObserver* observer)
     47 {
     48     if (id.isEmpty())
     49         return;
     50 
     51     IdToObserverSetMap::AddResult result = m_registry.add(id.impl(), nullptr);
     52     if (result.isNewEntry)
     53         result.storedValue->value = adoptPtrWillBeNoop(new ObserverSet());
     54 
     55     result.storedValue->value->add(observer);
     56 }
     57 
     58 void IdTargetObserverRegistry::removeObserver(const AtomicString& id, IdTargetObserver* observer)
     59 {
     60     if (id.isEmpty() || m_registry.isEmpty())
     61         return;
     62 
     63     IdToObserverSetMap::iterator iter = m_registry.find(id.impl());
     64 
     65     ObserverSet* set = iter->value.get();
     66     set->remove(observer);
     67     if (set->isEmpty() && set != m_notifyingObserversInSet)
     68         m_registry.remove(iter);
     69 }
     70 
     71 void IdTargetObserverRegistry::notifyObserversInternal(const AtomicString& id)
     72 {
     73     ASSERT(!id.isEmpty());
     74     ASSERT(!m_registry.isEmpty());
     75 
     76     m_notifyingObserversInSet = m_registry.get(id.impl());
     77     if (!m_notifyingObserversInSet)
     78         return;
     79 
     80     WillBeHeapVector<RawPtrWillBeMember<IdTargetObserver> > copy;
     81     copyToVector(*m_notifyingObserversInSet, copy);
     82     for (WillBeHeapVector<RawPtrWillBeMember<IdTargetObserver> >::const_iterator it = copy.begin(); it != copy.end(); ++it) {
     83         if (m_notifyingObserversInSet->contains(*it))
     84             (*it)->idTargetChanged();
     85     }
     86 
     87     if (m_notifyingObserversInSet->isEmpty())
     88         m_registry.remove(id.impl());
     89 
     90     m_notifyingObserversInSet = nullptr;
     91 }
     92 
     93 bool IdTargetObserverRegistry::hasObservers(const AtomicString& id) const
     94 {
     95     if (id.isEmpty() || m_registry.isEmpty())
     96         return false;
     97     ObserverSet* set = m_registry.get(id.impl());
     98     return set && !set->isEmpty();
     99 }
    100 
    101 } // namespace blink
    102