ObjectFactory.h

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/******************************************************************************
*
* Copyright Saab AB, 2006-2013 (http://safir.sourceforge.net)
* 
* Created by: Lars Hagström / stlrha
*
*******************************************************************************
*
* This file is part of Safir SDK Core.
*
* Safir SDK Core is free software: you can redistribute it and/or modify
* it under the terms of version 3 of the GNU General Public License as
* published by the Free Software Foundation.
*
* Safir SDK Core 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Safir SDK Core.  If not, see <http://www.gnu.org/licenses/>.
*
******************************************************************************/

#ifndef __DOTS_OBJECT_FACTORY_H__
#define __DOTS_OBJECT_FACTORY_H__

#include <boost/noncopyable.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/thread/once.hpp>
#include <Safir/Dob/Typesystem/Defs.h>
#include <Safir/Dob/Typesystem/Exceptions.h>

#ifdef _MSC_VER
#pragma warning(push) 
#pragma warning(disable: 4275)
#endif

namespace Safir
{
namespace Dob
{
namespace Typesystem
{
    //forward declaration since we would rather not include dots_object.h (Object.cpp includes this file...)
    class Object;

    typedef boost::shared_ptr<Object> ObjectPtr;

    class DOTS_CPP_API ObjectFactory
        : private boost::noncopyable
    {
    public:
        static ObjectFactory & Instance();

        ObjectPtr CreateObject(const TypeId typeId) const;

        typedef ObjectPtr (*CreateObjectCallback)(char const * const blob);

        bool RegisterClass(const TypeId typeId, CreateObjectCallback createFunction);

        ObjectPtr CreateObject(char const * const blob) const;

    private:
        ObjectFactory();
        ~ObjectFactory();

#ifdef _MSC_VER
#pragma warning (push)
#pragma warning (disable: 4251) // warning C4251: 'Safir::Dob::Typesystem::ObjectFactory::m_CallbackMap' : class 'stdext::hash_map<_Kty,_Ty>' needs to have dll-interface to be used by clients of class 'Safir::Dob::Typesystem::ObjectFactory'
#endif

        typedef unordered_map<TypeId,CreateObjectCallback> CallbackMap;
        CallbackMap m_CallbackMap;

#ifdef _MSC_VER
#pragma warning (pop)
#endif

        struct SingletonHelper
        {
        private:
            friend ObjectFactory& ObjectFactory::Instance();

            static ObjectFactory& Instance();
            static boost::once_flag m_onceFlag;
        };
    };
}
}
}

#ifdef _MSC_VER
#pragma warning(pop)
#endif

#endif