TauJetCorrFactors.h

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#ifndef DataFormats_PatCandidates_TauJetCorrFactors_h
#define DataFormats_PatCandidates_TauJetCorrFactors_h

#include <vector>
#include <string>
#include <math.h>

namespace pat {

  class TauJetCorrFactors {

  public:
    // tau-jet energy correction factor. 
    // the std::string indicates the correction level according to jetMET definitions.
    typedef std::pair<std::string, float> CorrectionFactor;

  public:
    // default Constructor
    TauJetCorrFactors() {};
    // constructor by value
    TauJetCorrFactors(const std::string& label, const std::vector<CorrectionFactor>& jec);

    // instance label of the jet energy corrections set 
    std::string jecSet() const { return label_; }
    // correction level from unsigned int
    std::string jecLevel(const unsigned int& level) const { return jec_.at(level).first; };
    // correction level from std::string
    int jecLevel(const std::string& level) const;

    // correction factor up to a given level
    float correction(unsigned int level) const;
    // a list of the labels of all correction levels according to jetMET definitions, separated by '\n'
    std::string correctionLabelString() const;
    // a vector of the labels of all correction levels according to jetMET definitions
    std::vector<std::string> correctionLabels() const;
    // label of a specific correction factor according to jetMET definitions; for overflow a string ERROR is returned
    std::string correctionLabel(unsigned int level) const { return (level<jec_.size() ? jec_.at(level).first : std::string("ERROR")); };
    // number of available correction factors
    unsigned int numberOfCorrectionLevels() const { return jec_.size(); };
    // print function for debugging
    void print() const;

  private:
    // instance label of jet energy correction factors
    std::string label_;
    // vector of CorrectionFactors. NOTE: the correction factors are expected to appear 
    // nested; they may appear in arbitary number and order according to the configuration 
    // of the jetCorrFactors module. 
    std::vector<CorrectionFactor> jec_;
  };
}

#endif