cs760-dt-learn/Feature.hpp at master · malichan/cs760-dt-learn · GitHub

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#ifndef Feature_hpp
#define Feature_hpp

#include <string>
#include <vector>
#include <unordered_map>

using namespace std;

class Feature {
private:
    int index;
    string name;
    string type;
    int range;

protected:
    Feature(int index, const string& name, const string& type, int range) : index(index), name(name), type(type), range(range) {}

public:
    int getIndex() const {
        return index;
    }

    const string& getName() const {
        return name;
    }

    const string& getType() const {
        return type;
    }

    int getRange() const {
        return range;
    }

    virtual ~Feature() {}
    virtual string toString() const = 0;
    virtual double convertValueToInternal(const string& str) const = 0;
    virtual string convertInternalToValue(double val) const = 0;
};

class NumericFeature : public Feature {
private:

public:
    NumericFeature(int index, const string& name) : Feature(index, name, "numeric", 2) {}

    virtual string toString() const;
    virtual double convertValueToInternal(const string& str) const;
    virtual string convertInternalToValue(double val) const;
};

class NominalFeature : public Feature {
private:
    vector<string> idxToName;
    unordered_map<string, int> nameToIdx;

public:
    NominalFeature(int index, const string& name, const vector<string>& values) : Feature(index, name, "nominal", (int)values.size()), idxToName(values) {
        for (int i = 0; i < getRange(); ++i)
            nameToIdx[idxToName[i]] = i;
    }

    virtual string toString() const;
    virtual double convertValueToInternal(const string& str) const;
    virtual string convertInternalToValue(double val) const;
};

#endif /* Feature_hpp */