recencyPredictor.h

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/******************************************************
 *  Presage, an extensible predictive text entry system
 *  ---------------------------------------------------
 *
 *  Copyright (C) 2008  Matteo Vescovi <matteo.vescovi@yahoo.co.uk>

    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.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
                                                                             *
                                                                **********(*)*/


#ifndef PRESAGE_RECENCYPREDICTOR
#define PRESAGE_RECENCYPREDICTOR

#include "predictor.h"
#include "../core/logger.h"
#include "../core/dispatcher.h"

class RecencyPredictor : public Predictor, public Observer {
public:
    RecencyPredictor (Configuration*, ContextTracker*, const char*);
    ~RecencyPredictor();

    virtual Prediction predict (const size_t size, const char** filter) const;

    virtual void learn (const std::vector<std::string>& change);

    virtual void update (const Observable* variable);

private:
    void set_lambda           (const std::string& value);
    void set_n_0              (const std::string& value);
    void set_cutoff_threshold (const std::string& value);

    std::string LOGGER;
    std::string LAMBDA;
    std::string N_0;
    std::string CUTOFF_THRESHOLD;
    
    double lambda;
    double n_0;
    size_t cutoff_threshold;

    Dispatcher<RecencyPredictor> dispatcher;

};

#endif // PRESAGE_RECENCYPREDICTOR