/data/refman/pasoursint/CMSSW_5_3_0/src/SimDataFormats/GeneratorProducts/interface/GenEventInfoProduct.h

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#ifndef SimDataFormats_GeneratorProducts_GenEventInfoProduct_h
#define SimDataFormats_GeneratorProducts_GenEventInfoProduct_h

#include <vector>
#include <memory>

#include "SimDataFormats/GeneratorProducts/interface/PdfInfo.h"

namespace HepMC { class GenEvent; } // forward declaration

class GenEventInfoProduct {
    public:
        GenEventInfoProduct();
        GenEventInfoProduct(const HepMC::GenEvent *evt);
        GenEventInfoProduct(const GenEventInfoProduct &other);
        virtual ~GenEventInfoProduct();

        GenEventInfoProduct &operator = (const GenEventInfoProduct &other);

        typedef gen::PdfInfo PDF;

        // getters

        const std::vector<double> &weights() const { return weights_; }
        double weight() const;

        unsigned int signalProcessID() const { return signalProcessID_; }

        double qScale() const { return qScale_; }
        double alphaQCD() const { return alphaQCD_; }
        double alphaQED() const { return alphaQED_; }

        const PDF *pdf() const { return pdf_.get(); }
        bool hasPDF() const { return pdf() != 0; }

        const std::vector<double> &binningValues() const { return binningValues_; }
        bool hasBinningValues() const { return !binningValues_.empty(); }

        // setters

        void setWeights(const std::vector<double> &weights)
        { weights_ = weights; }

        void setSignalProcessID(unsigned int procID)
        { signalProcessID_  = procID; }

        void setScales(double q = -1., double qcd = -1., double qed = -1.)
        { qScale_ = q, alphaQCD_ = qcd, alphaQED_ = qed; }

        void setPDF(const PDF *pdf) { pdf_.reset(pdf ? new PDF(*pdf) : 0); }

        void setBinningValues(const std::vector<double> &values)
        { binningValues_ = values; }

    private:
        // HepMC::GenEvent provides a list of weights
        std::vector<double>     weights_;

        // generator-dependent process ID
        unsigned int            signalProcessID_;

        // information about scales
        double                  qScale_;
        double                  alphaQCD_, alphaQED_;

        // optional PDF info
        std::auto_ptr<PDF>      pdf_;

        // If event was produced in bis, this contains
        // the values that were used to define which
        // bin the event belongs in
        // This replaces the genEventScale, which only
        // corresponds to Pythia pthat.  The RunInfo
        // will contain the information what physical
        // quantity these values actually belong to
        std::vector<double>     binningValues_;
};

#endif // SimDataFormats_GeneratorProducts_GenEventInfoProduct_h