/data/refman/pasoursint/CMSSW_5_3_1/src/DataFormats/PatCandidates/interface/ParametrizationHelper.h

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#ifndef DataFormats_PatCandidates_interface_ParametrizationHelper_h
#define DataFormats_PatCandidates_interface_ParametrizationHelper_h

#include "DataFormats/PatCandidates/interface/CandKinResolution.h"
#include <string>

namespace pat { namespace helper {
namespace ParametrizationHelper {

    inline uint32_t dimension(pat::CandKinResolution::Parametrization parametrization) {
        return (static_cast<uint32_t>(parametrization) & 0x0F);
    }

    pat::CandKinResolution::Parametrization fromString(const std::string &name) ;

    const char * name(pat::CandKinResolution::Parametrization param) ;   

    math::PtEtaPhiMLorentzVector polarP4fromParameters( pat::CandKinResolution::Parametrization parametrization, 
                                                        const AlgebraicVector4 &parameters, 
                                                        const math::PtEtaPhiMLorentzVector &initialP4) ;

    math::XYZTLorentzVector p4fromParameters(pat::CandKinResolution::Parametrization parametrization, 
                                            const AlgebraicVector4 &parameters,
                                            const math::XYZTLorentzVector &initialP4) ;

    AlgebraicVector4 parametersFromP4(pat::CandKinResolution::Parametrization parametrization, const math::XYZTLorentzVector &p4) ;

    AlgebraicVector4 parametersFromP4(pat::CandKinResolution::Parametrization parametrization, const math::PtEtaPhiMLorentzVector &p4) ;

    void setParametersFromP4(pat::CandKinResolution::Parametrization parametrization, AlgebraicVector4 &pars, const math::XYZTLorentzVector &p4) ;

    void setParametersFromP4(pat::CandKinResolution::Parametrization parametrization, AlgebraicVector4 &pars, const math::PtEtaPhiMLorentzVector &p4) ;

    template <typename T>
    void setParametersFromAnyVector(pat::CandKinResolution::Parametrization parametrization, AlgebraicVector4 &pars, const T &p4) ;


    AlgebraicVector4 diffToParameters(pat::CandKinResolution::Parametrization parametrization, 
                const math::XYZTLorentzVector &p4ini, const math::XYZTLorentzVector &p4fin) ;


    AlgebraicVector4 diffToParameters(pat::CandKinResolution::Parametrization parametrization, 
                const math::PtEtaPhiMLorentzVector &p4ini, const math::PtEtaPhiMLorentzVector &p4fin) ;

 
    bool isAlwaysMassless(pat::CandKinResolution::Parametrization parametrization) ;

    bool isAlwaysMassive(pat::CandKinResolution::Parametrization parametrization) ;

    bool isMassConstrained(pat::CandKinResolution::Parametrization parametrization) ;

    bool isPhysical(pat::CandKinResolution::Parametrization parametrization, const AlgebraicVector4 &v4, const math::PtEtaPhiMLorentzVector &initialP4) ;
} } }

#endif