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 RefCountedSupplement_h 27#define RefCountedSupplement_h 28 29#include "platform/Supplementable.h" 30#include "wtf/RefCounted.h" 31#include "wtf/RefPtr.h" 32 33namespace blink { 34 35#if !ENABLE(OILPAN) 36template<class T, class S> 37class RefCountedSupplement : public RefCounted<S> { 38public: 39 typedef RefCountedSupplement<T, S> ThisType; 40 41 virtual ~RefCountedSupplement() { } 42 43 class Wrapper FINAL : public Supplement<T> { 44 public: 45 explicit Wrapper(PassRefPtr<ThisType> wrapped) : m_wrapped(wrapped) { } 46 virtual ~Wrapper() { } 47#if ENABLE(SECURITY_ASSERT) 48 virtual bool isRefCountedWrapper() const OVERRIDE { return true; } 49#endif 50 ThisType* wrapped() const { return m_wrapped.get(); } 51 52 private: 53 54 RefPtr<ThisType> m_wrapped; 55 }; 56 57 static void provideTo(Supplementable<T>& host, const char* key, PassRefPtr<ThisType> supplement) 58 { 59 host.provideSupplement(key, adoptPtr(new Wrapper(supplement))); 60 } 61 62 static ThisType* from(Supplementable<T>& host, const char* key) 63 { 64 Supplement<T>* found = static_cast<Supplement<T>*>(host.requireSupplement(key)); 65 if (!found) 66 return 0; 67 ASSERT_WITH_SECURITY_IMPLICATION(found->isRefCountedWrapper()); 68 return static_cast<Wrapper*>(found)->wrapped(); 69 } 70}; 71#endif 72 73} // namespace blink 74 75#endif // RefCountedSupplement_h 76