JetMatching.h

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#ifndef GeneratorInterface_PartonShowerVeto_JetMatching_h
#define GeneratorInterface_PartonShowerVeto_JetMatching_h

#include <memory>
#include <vector>
#include <string>
#include <set>

#include <boost/shared_ptr.hpp>

#include <HepMC/GenEvent.h>
#include <HepMC/SimpleVector.h>

#include "FWCore/ParameterSet/interface/ParameterSet.h"

namespace lhef {

class LHERunInfo;
class LHEEvent;
class JetInput;
// class JetClustering;
}

namespace gen {

class JetMatching {
    public:
    JetMatching(const edm::ParameterSet &params);
    virtual ~JetMatching();

    struct JetPartonMatch {
        JetPartonMatch(const HepMC::FourVector  &parton,
                       const HepMC::FourVector  &jet,
                       double           delta,
                       int          pdgId) :
            parton(parton), jet(jet),
            delta(delta), pdgId(pdgId) {}

        JetPartonMatch(const HepMC::FourVector  &parton,
                       int          pdgId) :
            parton(parton), delta(-1.0), pdgId(pdgId) {}

        JetPartonMatch(const HepMC::FourVector &jet) :
            jet(jet), delta(-1.0), pdgId(0) {}

        inline bool isMatch() const { return delta >= 0 && pdgId; }
        inline bool hasParton() const { return pdgId; }
        inline bool hasJet() const { return delta >= 0 || !pdgId; }

        HepMC::FourVector   parton;
        HepMC::FourVector   jet;
        double          delta;
        int         pdgId;
    };

    virtual void init(const lhef::LHERunInfo* runInfo);
    virtual void beforeHadronisation(const lhef::LHEEvent* event);
    virtual void beforeHadronisationExec();

    virtual int match(const HepMC::GenEvent *partonLevel,
                      const HepMC::GenEvent *finalState,
                      bool showeredFinalState = false) = 0;

    virtual std::set<std::string> capabilities() const;
    
    void resetMatchingStatus() { fMatchingStatus = false; }
    bool isMatchingDone() { return fMatchingStatus; }

    const std::vector<JetPartonMatch> &getMatchSummary() const
    { return matchSummary; }

    static std::auto_ptr<JetMatching> create(
                    const edm::ParameterSet &params);

    protected:
        bool fMatchingStatus;
    std::vector<JetPartonMatch> matchSummary;
};

} // namespace gen


#endif // GeneratorCommon_PartonShowerVeto_JetMatching_h