Home | History | Annotate | Download | only in dom 
      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 WebCore {
     32 
     33 PassOwnPtr<IdTargetObserverRegistry> IdTargetObserverRegistry::create()
     34 {
     35     return adoptPtr(new IdTargetObserverRegistry());
     36 }
     37 
     38 void IdTargetObserverRegistry::addObserver(const AtomicString& id, IdTargetObserver* observer)
     39 {
     40     if (id.isEmpty())
     41         return;
     42 
     43     IdToObserverSetMap::AddResult result = m_registry.add(id.impl(), nullptr);
     44     if (result.isNewEntry)
     45         result.iterator->value = adoptPtr(new ObserverSet());
     46 
     47     result.iterator->value->add(observer);
     48 }
     49 
     50 void IdTargetObserverRegistry::removeObserver(const AtomicString& id, IdTargetObserver* observer)
     51 {
     52     if (id.isEmpty() || m_registry.isEmpty())
     53         return;
     54 
     55     IdToObserverSetMap::iterator iter = m_registry.find(id.impl());
     56 
     57     ObserverSet* set = iter->value.get();
     58     set->remove(observer);
     59     if (set->isEmpty() && set != m_notifyingObserversInSet)
     60         m_registry.remove(iter);
     61 }
     62 
     63 void IdTargetObserverRegistry::notifyObserversInternal(const AtomicString& id)
     64 {
     65     ASSERT(!id.isEmpty());
     66     ASSERT(!m_registry.isEmpty());
     67 
     68     m_notifyingObserversInSet = m_registry.get(id.impl());
     69     if (!m_notifyingObserversInSet)
     70         return;
     71 
     72     Vector<IdTargetObserver*> copy;
     73     copyToVector(*m_notifyingObserversInSet, copy);
     74     for (Vector<IdTargetObserver*>::const_iterator it = copy.begin(); it != copy.end(); ++it) {
     75         if (m_notifyingObserversInSet->contains(*it))
     76             (*it)->idTargetChanged();
     77     }
     78 
     79     if (m_notifyingObserversInSet->isEmpty())
     80         m_registry.remove(id.impl());
     81 
     82     m_notifyingObserversInSet = 0;
     83 }
     84 
     85 } // namespace WebCore
     86