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 IdTargetObserver_h 27 #define IdTargetObserver_h 28 29 #include "platform/heap/Handle.h" 30 #include "wtf/text/AtomicString.h" 31 32 namespace WebCore { 33 34 class IdTargetObserverRegistry; 35 36 class IdTargetObserver : public NoBaseWillBeGarbageCollectedFinalized<IdTargetObserver> { 37 public: 38 virtual ~IdTargetObserver(); 39 virtual void trace(Visitor*); 40 virtual void idTargetChanged() = 0; 41 virtual void unregister(); 42 43 protected: 44 IdTargetObserver(IdTargetObserverRegistry&, const AtomicString& id); 45 46 private: registry()47 IdTargetObserverRegistry& registry() { return *m_registry; } 48 49 RawPtrWillBeMember<IdTargetObserverRegistry> m_registry; 50 AtomicString m_id; 51 }; 52 53 } // namespace WebCore 54 55 #endif // IdTargetObserver_h 56