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/*
Copyright (C) 2000 Paul Davis
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.
*/
#ifndef __pbd_stateful_h__
#define __pbd_stateful_h__
#include <string>
#include "pbd/id.h"
class XMLNode;
namespace PBD {
namespace sys {
class path;
}
class Stateful {
public:
Stateful();
virtual ~Stateful();
virtual XMLNode& get_state (void) = 0;
virtual int set_state (const XMLNode&, int version) = 0;
/* Extra XML nodes */
void add_extra_xml (XMLNode&);
XMLNode *extra_xml (const std::string& str);
const PBD::ID& id() const { return _id; }
static int current_state_version;
static int loading_state_version;
protected:
void add_instant_xml (XMLNode&, const sys::path& directory_path);
XMLNode *instant_xml (const std::string& str, const sys::path& directory_path);
XMLNode *_extra_xml;
XMLNode *_instant_xml;
PBD::ID _id;
};
} // namespace PBD
#endif /* __pbd_stateful_h__ */
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