TopDecaySubset.h

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#include <memory>
#include <string>
#include <vector>
#include <map>

#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/EDProducer.h"
#include "FWCore/Framework/interface/Frameworkfwd.h"

#include "FWCore/Utilities/interface/InputTag.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "DataFormats/HepMCCandidate/interface/GenParticle.h"

class TopDecaySubset : public edm::EDProducer {

 public:
  enum  FillMode {kStable, kME};
  enum ShowerModel{kStart=-1, kNone, kPythia, kHerwig};

  explicit TopDecaySubset(const edm::ParameterSet& cfg);
  ~TopDecaySubset();
  virtual void produce(edm::Event& event, const edm::EventSetup& setup);

 private:
  std::vector<const reco::GenParticle*> findTops(const reco::GenParticleCollection& parts);
  ShowerModel checkShowerModel(const std::vector<const reco::GenParticle*>& tops) const;
  void checkWBosons(std::vector<const reco::GenParticle*>& tops) const;
  void fillListing(const std::vector<const reco::GenParticle*>& tops, reco::GenParticleCollection& target);

  void clearReferences();
  void fillReferences(const reco::GenParticleRefProd& refProd, reco::GenParticleCollection& target);
  reco::Particle::LorentzVector p4(const std::vector<const reco::GenParticle*>::const_iterator top, int statusFlag);
  reco::Particle::LorentzVector p4(const reco::GenParticle::const_iterator part, int statusFlag);
  void addDaughters(int& idx, const reco::GenParticle::const_iterator part, reco::GenParticleCollection& target, bool recursive=true);
  void addRadiation(int& idx, const reco::GenParticle::const_iterator part, reco::GenParticleCollection& target);

 private:
  edm::InputTag src_;
  bool addRadiation_;
  FillMode fillMode_;
  ShowerModel showerModel_;

  int motherPartIdx_;                    
  std::map<int,std::vector<int> > refs_; 
};