/*
  CONFIGRULES.hpp  -  interface for rule based configuration
 
  Copyright (C)         CinelerraCV
    2007,               Hermann Vosseler <Ichthyostega@web.de>
 
  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; either version 2 of the
  License, or (at your option) any later version.
 
  This program 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 General Public License for more details.
 
  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
*/


/** @file configrules.hpp
 ** Interface for accessing rule based configuration.
 ** By using the Query template, you can pose a query in prolog syntax and get some
 ** existing or newly created object fulfilling the requested predicates. The actual 
 ** implementation is hidden behind the #instance (Singleton factory). As of 1/2008, 
 ** it is \i planned to use an embedded YAP Prolog system at some point in the future,
 ** for now we use a \link MockConfigRules mock implementation \endlink employing a
 ** preconfigured Map.
 **
 ** Fully implementing this facility would require the participating objects to register capabilities
 ** they want to provide, together with functors carrying out the neccessary configuration steps.
 ** All details and consequences of this approach still have to be worked out...
 **
 ** @see cinelerra::Query
 ** @see mobject::session::DefsManager
 ** @see asset::StructFactory 
 **
 */


#ifndef CINELERRA_CONFIGRULES_H
#define CINELERRA_CONFIGRULES_H

#include "common/query.hpp"
#include "common/singleton.hpp"

#include <string>



namespace cinelerra
  {
  using std::string;
  
  /** 
   * Generic query interface for retrieving objects matching
   * some capability query
   */
  class ConfigRules
    {
    protected:
      ConfigRules ();
      friend class cinelerra::singleton::StaticCreate<ConfigRules>;

    public:
      static Singleton<ConfigRules> instance;
    };

    
  namespace query
    {
    
    
  
  } // namespace query
    
} // namespace cinelerra
#endif