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/*
* Copyright (C) 2012 Google, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef Supplementable_h
#define Supplementable_h
#include <wtf/HashMap.h>
#include <wtf/PassOwnPtr.h>
#include <wtf/text/AtomicString.h>
#include <wtf/text/AtomicStringHash.h>
namespace WebCore {
template<typename T>
class Supplementable;
template<typename T>
class Supplement {
public:
virtual ~Supplement() { }
#if !ASSERT_DISABLED
virtual bool isRefCountedWrapper() const { return false; }
#endif
static void provideTo(Supplementable<T>* host, const AtomicString& key, PassOwnPtr<Supplement<T> > supplement)
{
host->provideSupplement(key, supplement);
}
static Supplement<T>* from(Supplementable<T>* host, const AtomicString& key)
{
return host ? host->requireSupplement(key) : 0;
}
};
template<typename T>
class Supplementable {
public:
void provideSupplement(const AtomicString& key, PassOwnPtr<Supplement<T> > supplement)
{
ASSERT(!m_supplements.get(key.impl()));
m_supplements.set(key, supplement);
}
Supplement<T>* requireSupplement(const AtomicString& key)
{
return m_supplements.get(key);
}
private:
typedef HashMap<AtomicString, OwnPtr<Supplement<T> > > SupplementMap;
SupplementMap m_supplements;
};
} // namespace WebCore
#endif // Supplementable_h
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