output-designation.hpp

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/*
  OUTPUT-DESIGNATION.hpp  -  specifying a desired output destination

   Copyright (C)
     2010,            Hermann Vosseler <Ichthyostega@web.de>

  **Lumiera** 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. See the file COPYING for further details.

*/


#ifndef STEAM_MOBJECT_OUTPUT_DESIGNATION_H
#define STEAM_MOBJECT_OUTPUT_DESIGNATION_H

#include "steam/asset/pipe.hpp"
#include "lib/hash-value.h"
#include "lib/opaque-holder.hpp"
#include "lib/meta/typelist-manip.hpp"


namespace steam {
namespace mobject {
  
  namespace mp = lib::meta;
  
  class MObject;
  
  template<class MX>
  class PlacementRef;
  
  typedef PlacementRef<MObject> RefPlacement;
  
  
  
  class OutputDesignation
    {
    public:
      using   PID = asset::ID<asset::Pipe>;
      using PPipe = asset::PPipe;
      
      explicit OutputDesignation (PID explicitTarget);
      explicit OutputDesignation (RefPlacement const& indirectTarget);
      explicit OutputDesignation (uint relative_busNr =0);
      
      // using default copying
      
      
      PID
      resolve (PPipe origin)
        {
          return spec_->resolve (origin);
        }
      
      //TODO: API to retrieve target stream type
      
      
      class TargetSpec
        {
        public:
          virtual ~TargetSpec();
          virtual PID resolve (PPipe origin)  =0;
        };
      
    private:
      enum
        { VTABLE   = sizeof(size_t)
        , SPEC_SIZ = VTABLE
                   + mp::maxSize<
                       mp::Types< PID, lumiera_uid, uint>::List>::value
        };
      typedef lib::OpaqueHolder<TargetSpec, SPEC_SIZ> SpecBuff;
      
      
      SpecBuff spec_;
      
    };
  
  
  
}} // namespace steam::mobject
#endif /*STEAM_MOBJECT_OUTPUT_DESIGNATION_H*/