StringPreprocessor.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) 1999-2009 Soeren Sonnenburg
 * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
 */

#ifndef _CSTRINGPREPROC__H__
#define _CSTRINGPREPROC__H__

#include <shogun/lib/config.h>

#include <shogun/features/Features.h>
#include <shogun/features/StringFeatures.h>
#include <shogun/lib/common.h>
#include <shogun/preprocessor/Preprocessor.h>

namespace shogun
{
template <class ST> class CStringFeatures;

template <class ST> class CStringPreprocessor : public CPreprocessor
{
    public:
        CStringPreprocessor() : CPreprocessor() {}

        virtual CFeatures* apply(CFeatures* features);

        virtual bool apply_to_string_features(CFeatures* f)=0;

        virtual ST* apply_to_string(ST* f, int32_t &len)=0;

        virtual EFeatureClass get_feature_class() { return C_STRING; }
        virtual EFeatureType get_feature_type();

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

        virtual EPreprocessorType get_type() const { return P_UNKNOWN; }

};

template<> inline EFeatureType CStringPreprocessor<uint64_t>::get_feature_type()
{
    return F_ULONG;
}

template<> inline EFeatureType CStringPreprocessor<int64_t>::get_feature_type()
{
    return F_LONG;
}

template<> inline EFeatureType CStringPreprocessor<uint32_t>::get_feature_type()
{
    return F_UINT;
}

template<> inline EFeatureType CStringPreprocessor<int32_t>::get_feature_type()
{
    return F_INT;
}

template<> inline EFeatureType CStringPreprocessor<uint16_t>::get_feature_type()
{
    return F_WORD;
}

template<> inline EFeatureType CStringPreprocessor<int16_t>::get_feature_type()
{
    return F_WORD;
}

template<> inline EFeatureType CStringPreprocessor<uint8_t>::get_feature_type()
{
    return F_BYTE;
}

template<> inline EFeatureType CStringPreprocessor<int8_t>::get_feature_type()
{
    return F_BYTE;
}

template<> inline EFeatureType CStringPreprocessor<char>::get_feature_type()
{
    return F_CHAR;
}

template<> inline EFeatureType CStringPreprocessor<bool>::get_feature_type()
{
    return F_BOOL;
}

template<> inline EFeatureType CStringPreprocessor<float32_t>::get_feature_type()
{
    return F_SHORTREAL;
}

template<> inline EFeatureType CStringPreprocessor<float64_t>::get_feature_type()
{
    return F_DREAL;
}

template<> inline EFeatureType CStringPreprocessor<floatmax_t>::get_feature_type()
{
    return F_LONGREAL;
}

template <class ST>
CFeatures* CStringPreprocessor<ST>::apply(CFeatures* features)
{
    REQUIRE(features->get_feature_class()==C_STRING, "Provided features (%d) "
            "has to be of C_STRING (%d) class!\n",
            features->get_feature_class(), C_STRING);

    apply_to_string_features(features);
    return features;
}

}
#endif