StreamingVwCacheFile.h

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/*
 * 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
 * Copyright (C) 2011 Berlin Institute of Technology and Max-Planck-Society
 */
#ifndef __STREAMING_VWCACHEFILE_H__
#define __STREAMING_VWCACHEFILE_H__

#include <shogun/lib/config.h>

#include <shogun/io/streaming/StreamingFile.h>
#include <shogun/classifier/vw/vw_common.h>
#include <shogun/classifier/vw/cache/VwCacheReader.h>
#include <shogun/classifier/vw/cache/VwNativeCacheReader.h>

namespace shogun
{
class CStreamingVwCacheFile: public CStreamingFile
{
public:
    CStreamingVwCacheFile();

    CStreamingVwCacheFile(EVwCacheType cache_type);

    CStreamingVwCacheFile(char* fname, char rw='r', EVwCacheType cache_type = C_NATIVE);

    virtual ~CStreamingVwCacheFile();

    virtual void get_vector(VwExample* &ex, int32_t &len);

    virtual void get_vector_and_label(VwExample* &ex, int32_t &len, float64_t &label);

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

    void set_env(CVwEnvironment* env_to_use);

    CVwEnvironment* get_env()
    {
        SG_REF(env);
        return env;
    }

    bool is_seekable() { return true; }

    void reset_stream();

private:
    virtual void init(EVwCacheType cache_type);

protected:
    CVwCacheReader* cache_reader;

    CVwEnvironment* env;

    EVwCacheType cache_format;
};
}
#endif //__STREAMING_VWCACHEFILE_H__