OBTPrototypeFactory.h

Go to the documentation of this file.

#ifndef OBT_PROTOTYPE_FACTORY_H
#define OBT_PROTOTYPE_FACTORY_H

#include <utility>
#include <map>

#include "OBTSingleton.h"

namespace OBT
{
template< class TIdentifier, class TCreator > 
class PrototypeFactory
{
public:

        friend class Singleton< PrototypeFactory< TIdentifier, TCreator > > ;

        virtual ~PrototypeFactory() ;

        const TCreator& create( const TIdentifier& classId ) const ;

        template < class TDerivedCreator > bool registerCreator( const TIdentifier& classId ) ;

private:

        PrototypeFactory() ;

        PrototypeFactory( const PrototypeFactory& ) ;

        PrototypeFactory& operator=( const PrototypeFactory& ) ;

        std::map< TIdentifier, TCreator* > _creators ;
} ;

//-------------------------------------------------------------------------
// constructor
//-------------------------------------------------------------------------
template< class TIdentifier, class TCreator >
PrototypeFactory< TIdentifier, TCreator >::PrototypeFactory()
{
}

//-------------------------------------------------------------------------
// destructor
//-------------------------------------------------------------------------
template< class TIdentifier, class TCreator >
PrototypeFactory< TIdentifier, TCreator >::~PrototypeFactory()
{
}

//-------------------------------------------------------------------------
// create
//-------------------------------------------------------------------------
template< class TIdentifier, class TCreator >
const TCreator&
        PrototypeFactory< TIdentifier, TCreator >::create( const TIdentifier& classId ) const
{
        typename std::map< TIdentifier, TCreator* >::const_iterator ite( _creators.find( classId ) ) ;
        if( ite != _creators.end() )
        {
                return *ite->second ;
        }

        static TCreator creator ;
        return creator ;
}

//-------------------------------------------------------------------------
// registerCreator
//-------------------------------------------------------------------------
template< class TIdentifier, class TCreator > 
template< class TDerivedCreator >
bool
        PrototypeFactory< TIdentifier, TCreator >::registerCreator( const TIdentifier& classId )
{
        static TDerivedCreator creator ;
        _creators[classId] = &creator ;
        return true ;
}
} // namespace OBT

#endif //OBT_PROTOTYPE_FACTORY_H

---