VwCacheReader.h

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/*
 * Copyright (c) 2009 Yahoo! Inc.  All rights reserved.  The copyrights
 * embodied in the content of this file are licensed under the BSD
 * (revised) open source license.
 *
 * 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 3 of the License, or
 * (at your option) any later version.
 *
 * Written (W) 2011 Shashwat Lal Das
 * Adaptation of Vowpal Wabbit v5.1.
 * Copyright (C) 2011 Berlin Institute of Technology and Max-Planck-Society.
 */

#ifndef _VW_CACHEREAD_H__
#define _VW_CACHEREAD_H__

#include <shogun/base/SGObject.h>
#include <shogun/lib/common.h>
#include <shogun/io/IOBuffer.h>
#include <shogun/classifier/vw/vw_common.h>

namespace shogun
{

enum EVwCacheType
{
    C_NATIVE = 0,
    C_PROTOBUF = 1
};

class CVwCacheReader: public CSGObject
{
public:
    CVwCacheReader();

    CVwCacheReader(char * fname, CVwEnvironment* env_to_use);

    CVwCacheReader(int32_t f, CVwEnvironment* env_to_use);

    virtual ~CVwCacheReader();

    virtual void set_file(int32_t f);

    virtual void set_env(CVwEnvironment* env_to_use);

    virtual CVwEnvironment* get_env();

    virtual void set_mm(float64_t label)
    {
        env->min_label = CMath::min(env->min_label, label);
        if (label != FLT_MAX)
            env->max_label = CMath::max(env->max_label, label);
    }

    virtual void noop_mm(float64_t label) { }

    virtual void set_minmax(float64_t label)
    {
        set_mm(label);
    }

    virtual bool read_cached_example(VwExample* const ae) = 0;

    virtual const char* get_name() const { return "VwCacheReader"; }

protected:
    int32_t fd;

    CVwEnvironment* env;
};

}
#endif // _VW_CACHEREAD_H__