third_party/WebKit/Source/platform/RefCountedSupplement.h

   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
  33 namespace blink {
  34
  35 #if !ENABLE(OILPAN)
  36 template<class T, class S>
  37 class RefCountedSupplement : public RefCounted<S> {
  38 public:
  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         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