/* * 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() { } 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