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 #ifndef IdTargetObserverRegistry_h 27 #define IdTargetObserverRegistry_h 28 29 #include "wtf/Forward.h" 30 #include "wtf/HashMap.h" 31 #include "wtf/HashSet.h" 32 #include "wtf/PassOwnPtr.h" 33 #include "wtf/text/StringHash.h" 34 35 namespace WebCore { 36 37 class IdTargetObserver; 38 39 class IdTargetObserverRegistry { 40 WTF_MAKE_FAST_ALLOCATED; 41 friend class IdTargetObserver; 42 public: 43 static PassOwnPtr<IdTargetObserverRegistry> create(); 44 void notifyObservers(const AtomicString& id); 45 46 private: 47 IdTargetObserverRegistry() : m_notifyingObserversInSet(0) { } 48 void addObserver(const AtomicString& id, IdTargetObserver*); 49 void removeObserver(const AtomicString& id, IdTargetObserver*); 50 void notifyObserversInternal(const AtomicString& id); 51 52 typedef HashSet<IdTargetObserver*> ObserverSet; 53 typedef HashMap<StringImpl*, OwnPtr<ObserverSet> > IdToObserverSetMap; 54 IdToObserverSetMap m_registry; 55 ObserverSet* m_notifyingObserversInSet; 56 }; 57 58 inline void IdTargetObserverRegistry::notifyObservers(const AtomicString& id) 59 { 60 ASSERT(!m_notifyingObserversInSet); 61 if (id.isEmpty() || m_registry.isEmpty()) 62 return; 63 IdTargetObserverRegistry::notifyObserversInternal(id); 64 } 65 66 } // namespace WebCore 67 68 #endif // IdTargetObserverRegistry_h 69
