/data/refman/pasoursint/CMSSW_5_3_0/src/GeneratorInterface/PartonShowerVeto/interface/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