utilmm: utilmm: factory.hh Source File

00001 /* -*- C++ -*-
00002  * $Id: factory.hh 957 2005-03-07 16:01:20Z sjoyeux $
00003  */
00004 #ifndef UTILMM_TYPES_FACTORY_HEADER
00005 # define UTILMM_TYPES_FACTORY_HEADER
00006 #include "utilmm/config/config.h"
00007 
00008 #include "boost/utility.hpp"
00009 
00010 #include "utilmm/singleton/wrapper_fwd.hh"
00011 #include "utilmm/functional/arg_traits.hh"
00012 
00013 #include "utilmm/types/factory_fwd.hh"
00014 #include "utilmm/types/bits/factory_error.hh"
00015 
00016 namespace utilmm {
00017 
00042   template< class AbstractProduct, typename IdentifierType, typename Result,
00043             typename ProductCreator,
00044             template<typename, class, typename> class FactoryErrorPolicy,
00045             class OrderId >
00046   class factory
00047     :public FactoryErrorPolicy<IdentifierType, AbstractProduct, Result>,
00048      public boost::noncopyable {
00049   private:
00050     typedef typename arg_traits<IdentifierType>::type id_param;
00051     typedef typename arg_traits<ProductCreator>::type creator_param;
00052 
00053     typedef std::map<IdentifierType, ProductCreator, OrderId> factory_db;
00054     
00055     factory_db associations;
00056 
00057   public:
00070     bool add(id_param id, creator_param creator) {
00071       typename factory_db::value_type to_add(id, creator);
00072 
00073       return associations.insert(to_add).second;
00074     }
00084     bool remove(id_param id) {
00085       return associations.erase(id)==1;
00086     }
00087 
00100     bool make_alias(id_param from, id_param to) {
00101       typename factory_db::iterator i = associations.find(to);
00102       
00103       return associations.end()==i || add(from, i->second);
00104     }
00105 
00116     Result create(id_param id) {
00117       typename factory_db::iterator i = associations.find(id);
00118       
00119       if( associations.end()==i )
00120         return this->on_unknown_id(id);
00121       else
00122         return (i->second)();
00123     }
00124 
00133     bool check_entry(id_param id) const {
00134       return associations.find(id)!=associations.end();
00135     }
00136 
00148     ProductCreator const &get_creator(id_param id) const {
00149       typename factory_db::const_iterator i = associations.find(id);
00150       
00151       if( associations.end()==i )
00152         return this->on_unknown_type(id);
00153       else
00154         return i->second;
00155     }
00156     
00157   private:
00158     factory() {}
00159     ~factory() {}
00160 
00161     template<class Ty>
00162     friend class singleton::wrapper;
00163   }; // class utilmm::factory<>
00164             
00165 } // namespace utilmm
00166 
00167 # define IN_UTILMM_TYPES_FACTORY_HEADER
00168 #include "utilmm/types/bits/factory.tcc"
00169 # undef IN_UTILMM_TYPES_FACTORY_HEADER
00170 #endif // UTILMM_TYPES_FACTORY_HEADER
00171