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