factory.hpp

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/***********************************************************************************************************
Copyright (c) 2012, Sebastian Breß, Otto-von-Guericke University of Magdeburg, Germany. All rights reserved.

This program and accompanying materials are made available under the terms of the 
GNU LESSER GENERAL PUBLIC LICENSE - Version 3, http://www.gnu.org/licenses/lgpl-3.0.txt
***********************************************************************************************************/
#pragma once

#include <map>

namespace hype{
   namespace core{

            template<class AbstractProduct, typename IdentifierType, typename ProductCreator = AbstractProduct* (*)()>
             class Factory{
                       private:
                             typedef std::map<IdentifierType, ProductCreator> AssocMap;
                             AssocMap associations_;
       
                       public:

                              Factory(): associations_(){}
~Factory(){
associations_.erase(associations_.begin(), associations_.end());
}

                              bool Register(const IdentifierType& id, ProductCreator creator){
                                    return associations_.insert(typename AssocMap::value_type(id,creator)).second;
                              }

                              bool Unregister(const IdentifierType& id){
                                    return associations_.erase(id)==1;
                              } 
                              AbstractProduct* CreateObject(const IdentifierType& id){
                                    typename AssocMap::const_iterator i = associations_.find(id);
                                    if(i!=associations_.end()){
                                         return i->second();
                                    }
                                    return NULL;
                              }
           };

   }; //end namespace core
}; //end namespace hype