StreamingFeatures.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
 * Written (W) 2012 Heiko Strathmann
 * Copyright (C) 2011 Berlin Institute of Technology and Max-Planck-Society
 */
#ifndef _STREAMING_FEATURES__H__
#define _STREAMING_FEATURES__H__

#include <shogun/lib/config.h>

#include <shogun/lib/common.h>
#include <shogun/features/Features.h>
#include <shogun/io/streaming/StreamingFile.h>

namespace shogun
{
class CStreamingFeatures : public CFeatures
{

public:

    CStreamingFeatures();

    virtual ~CStreamingFeatures();

    void set_read_functions();

    virtual void set_vector_reader()=0;

    virtual void set_vector_and_label_reader()=0;

    virtual void start_parser()=0;

    virtual void end_parser()=0;

    virtual float64_t get_label()=0;

    virtual bool get_next_example()=0;

    virtual void release_example()=0;

    virtual int32_t get_num_features()=0;

    virtual bool get_has_labels();

    virtual bool is_seekable();

    virtual void reset_stream();

    virtual CFeatures* get_streamed_features(index_t num_elements)
    {
        SG_ERROR("%s::get_streamed_features() is not yet implemented!\n",
                get_name());
        return NULL;
    }

protected:

    bool has_labels;

    CStreamingFile* working_file;

    bool seekable;

};
}
#endif // _STREAMING_FEATURES__H__