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inference_engine.h

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// Inference Engine Basics implementation -*- C++ -*-

// Copyright (C) 2001-2003 Hermann Schichl
//
// This file is part of the COCONUT API.  This library
// is free software; you can redistribute it and/or modify it under the
// terms of the Library GNU General Public License as published by the
// Free Software Foundation; either version 2, 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
// Library GNU General Public License for more details.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the Library GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the Library GNU General Public License.

#ifndef _INFERENCE_ENGINE_H
#define _INFERENCE_ENGINE_H

#include <iostream>
#include <coconut_config.h>
#include <search_node.h>
#include <termreason.h>
#include <gptr.h>
#include <string>
#include <dbtools.h>
#include <viewdbase>
#include <ie_statistic.h>
#include <control_data.h>
#include <ie_rettype.h>

using namespace vgtl;

class inference_engine
{
protected:
  std::string __name;
  const gptr<work_node>* __wnode;
  work_node_context* __wnc;
  vdbl::viewdbase __vdb;
  std::vector<delta_id> _old_deltas, _new_deltas;

private:
  void __prep_delta_list();

public:
  // the constructor for a basic inference engine
  inference_engine(const gptr<work_node>& wnode, const std::string& __n)
         : __name(__n), __wnode(&wnode),
           __wnc(new work_node_context(&wnode)),
           __vdb(*(*wnode).database()->get_local_copy(),
                 (*wnode).get_dbuserid(), *__wnc,
                 std::vector<std::pair<vdbl::tableid,vdbl::rowid> >(
                 (*wnode).get_annotations().begin(),
                 (*wnode).get_annotations().end())),
           _old_deltas(), _new_deltas()
    { __prep_delta_list(); }

  virtual ~inference_engine() { delete __wnc; }

  virtual bool update_engine(const gptr<work_node>& wnode)
    {
      __wnode = &wnode;
      swap(_old_deltas, _new_deltas);
      __prep_delta_list();
      return true;
    }

  // returns the deltas to be applied and unapplied
  std::pair<std::list<delta_id>,std::list<delta_id> > new_deltas();

  const delta* get_delta(const delta_id& __d) const
    { return &(*__wnode)->get_delta(__d); }

  const model* get_model() const
    { return (*__wnode)->get_model(); }
  
  virtual ie_return_type infer(const control_data& __c)
    { return ie_return_type(termination_reason(0, std::string("SUCCESS"))); }

  const std::string& get_name() const { return __name; }
       
  // collect statistics
  virtual statistic_info last_call_stat() { return statistic_info(); }
  virtual statistic_info cumulative_stat() { return statistic_info(); }
};

#endif /* _INFERENCE_ENGINE_H */

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