MetaClass.h

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////////////////////////////////////////////////////////////////////////////////
//    Scorched3D (c) 2000-2009
//
//    This file is part of Scorched3D.
//
//    Scorched3D is free software; you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation; either version 2 of the License, or
//    (at your option) any later version.
//
//    Scorched3D 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 Scorched3D; if not, write to the Free Software
//    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
////////////////////////////////////////////////////////////////////////////////

#if !defined(__INCLUDE_MetaClassh_INCLUDE__)
#define __INCLUDE_MetaClassh_INCLUDE__

#include <string>
#include <map>

#define REGISTER_CLASS_HEADER(x) \
\
class METAFACTORY_##x : public MetaClassFactory \
{ \
        virtual MetaClass *getClassCopy() { return new x ; } \
}; \
virtual const char *getClassName() { return #x ; } \
virtual unsigned int getMetaClassId() \
{ \
        static unsigned int metaClassID = nextMetaClassId_++; return metaClassID; \
} 

#define REGISTER_CLASS_SOURCE(x) \
        struct META_##x { META_##x() { MetaClassRegistration::addMap(#x , new x::METAFACTORY_##x ); } }; \
        static META_##x META_IMPL_##x ;

class MetaClass
{
public:
        MetaClass();
        virtual ~MetaClass();   

        // Automatically given by the 
        // REGISTER_CLASS_HEADER and
        // REGISTER_CLASS_SOURCE macros
        virtual unsigned int getMetaClassId() = 0;
        virtual const char *getClassName() = 0;
protected:
        static unsigned int nextMetaClassId_;
};

class MetaClassFactory
{
public:
        MetaClassFactory();
        virtual ~MetaClassFactory();
        
        // Automatically given by the 
        // REGISTER_CLASS_HEADER and
        // REGISTER_CLASS_SOURCE macros
        virtual MetaClass *getClassCopy() = 0;
};

class MetaClassRegistration
{
public:
        static void addMap(const char *name, MetaClassFactory *mclass);
        static std::map<std::string, MetaClassFactory *> *classMap;
        static MetaClass *getNewClass(const char *name);
        static MetaClassFactory *getFactory(const char *name);
};

#endif // __INCLUDE_MetaClassh_INCLUDE__

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