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MultiTypeFactory.hpp

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 * This file is part of openWNS (open Wireless Network Simulator)
 * _____________________________________________________________________________
 *
 * Copyright (C) 2004-2007
 * Chair of Communication Networks (ComNets)
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 * _____________________________________________________________________________
 *
 * openWNS is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License version 2 as published by the
 * Free Software Foundation;
 *
 * openWNS is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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#ifndef WNS_MODULE_MULTITYPEFACTORY_HPP
#define WNS_MODULE_MULTITYPEFACTORY_HPP

#include <WNS/Chamaeleon.hpp>

namespace wns { namespace module {
    template<typename I>
    class MultiTypeFactory
    {
    public:
        typedef wns::ChamaeleonBase::BadCast BadCast;
        MultiTypeFactory()
        {}

        virtual
        ~MultiTypeFactory()
        {}

        template <typename T>
        T
        get(const I& i)
        {
            ChamaeleonBase* v = create(i);
            if(!v) {
                return NULL;
            }

            Chamaeleon<T>* ct = 0;
            T t = 0;
            try {
                ct = v->template downCast<T>();
                t = ct->unHide();
                delete ct;
            } catch(...) {
                if(ct)
                    delete ct;
                    // FIXME(msg): we can free the chamaeleon, but not the
                    // obj hidden within the chamaeleon.
                delete v;

                throw;
            }

            return t;
        }
    protected:
        virtual ChamaeleonBase*
        create(const I& i) =0;
    };
}
}
#endif // NOT defined WNS_MODULE_MULTITYPEFACTORY_HPP

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