factory.hpp

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/*
  CLAW - a C++ Library Absolutely Wonderful
 
  CLAW is a free library without any particular aim but being useful to
  anyone.
 
  Copyright (C) 2005-2011 Julien Jorge
 
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.
 
  This library 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
  Lesser General Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
  contact: julien.jorge@stuff-o-matic.com
*/
#ifndef __CLAW_FACTORY_HPP__
#define __CLAW_FACTORY_HPP__
 
#ifdef CLAW_FACTORY_IS_SINGLETON
#include <claw/basic_singleton.hpp>
#endif
 
#include <claw/exception.hpp>
#include <map>
 
namespace claw
{
  namespace pattern
  {
    class bad_type_identifier : public exception
    {
    public:
      bad_type_identifier() throw()
        : exception("No type has this identifier.")
      {}
    }; // class bad_type_identifier

    template <typename BaseClass, typename IdentifierType>
#ifdef CLAW_FACTORY_IS_SINGLETON
    class factory : public basic_singleton<factory<BaseClass, IdentifierType> >
#else
    class factory
#endif
    {
    private:
      class class_creator_base
      {
      public:
        virtual ~class_creator_base();
        virtual BaseClass* create() const = 0;
 
      }; // class class_creator_base

      template <typename Derived>
      class class_creator : public class_creator_base
      {
      public:
        virtual Derived* create() const;
 
      }; // class class_creator

      typedef IdentifierType identifier_type;

      typedef BaseClass base_class;

      typedef std::map<identifier_type, class_creator_base*> class_map;
 
    public:
      ~factory();
 
      template <typename T>
      bool register_type(const identifier_type& id);
 
      base_class* create(const identifier_type& id) const;
 
      bool is_known_type(const identifier_type& id) const;
 
    private:
      class_map m_classes;
 
    }; // class factory
 
  }
}
 
#include <claw/factory.tpp>
 
#endif // __CLAW_FACTORY_HPP__