factory_error.hh

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/* -*- C++ -*-
 * $Id: factory_error.hh 954 2005-02-23 12:38:20Z fpy $
 */
#ifndef UTILMM_TYPES_FACTORY_ERROR_HEADER
# define UTILMM_TYPES_FACTORY_ERROR_HEADER

# include <stdexcept>
# include <sstream>

namespace utilmm {
  namespace factory_toolbox {
    
    template<class AbstractProduct, typename IdentifierType, typename Result>
    struct error {
      
      class exception
        :public std::runtime_error {
      private:
        exception(std::string const &msg)
          : std::runtime_error(msg) {}

        friend class error;
      }; // class utilmm::factory_toolbox::error<>::exception

      template<typename Ty>
      static Ty on_unknown_id(IdentifierType const &id) {
        std::ostringstream msg;
        msg<<"factory error : type "<<id<<" is unknown.";
        throw exception(msg.str());
      }

      static Result on_unknown_type(IdentifierType const &id) {
        return on_unknown_id<Result>(id);
      }
    }; // struct utilmm::factory_toolbox::error<>
    
  } // namespace utilmm::factory_toolbox
} // namespace utilmm

#endif // UTILMM_TYPES_FACTORY_ERROR_HEADER