/*
  This file is part of Machina.
  Copyright 2007-2013 David Robillard <http://drobilla.net>

  Machina 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 3 of the License, or any later version.

  Machina 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 Machina.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef MACHINA_STATEFUL_HPP
#define MACHINA_STATEFUL_HPP

#include <stdint.h>

#include "sord/sordmm.hpp"

#include "machina/types.hpp"

namespace Raul {
class Atom;
}

namespace machina {

class URIs;

class Stateful
{
public:
	Stateful();

	virtual ~Stateful() {}

	virtual void set(URIInt key, const Raul::Atom& value) {}
	virtual void write_state(Sord::Model& model) = 0;

	uint64_t          id() const { return _id; }
	const Sord::Node& rdf_id(Sord::World& world) const;

	static uint64_t next_id() { return _next_id++; }

protected:
	explicit Stateful(uint64_t id) : _id(id) {}

private:
	static uint64_t _next_id;

	uint64_t           _id;
	mutable Sord::Node _rdf_id;
};

class StatefulKey : public Stateful
{
public:
	explicit StatefulKey(uint64_t id) : Stateful(id) {}

	void write_state(Sord::Model& model) {}
};

} // namespace machina

#endif // MACHINA_STATEFUL_HPP