HITRegionalPixelSeedGenerator.h

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#ifndef HITRegionalPixelSeedGenerator_h
#define HITRegionalPixelSeedGenerator_h

//
// Class:           HITRegionalPixelSeedGenerator


#include "FWCore/Framework/interface/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/ConsumesCollector.h"
#include "DataFormats/Common/interface/Handle.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Utilities/interface/InputTag.h"
#include "RecoTracker/TkTrackingRegions/interface/TrackingRegionProducer.h"
#include "RecoTracker/TkTrackingRegions/interface/GlobalTrackingRegion.h"
#include "RecoTracker/TkTrackingRegions/interface/RectangularEtaPhiTrackingRegion.h"
#include "DataFormats/VertexReco/interface/Vertex.h"
#include "DataFormats/VertexReco/interface/VertexFwd.h"
#include "DataFormats/TrackReco/interface/Track.h"
#include "DataFormats/JetReco/interface/CaloJetCollection.h"
#include "DataFormats/Math/interface/Vector3D.h"
#include "DataFormats/L1Trigger/interface/L1JetParticle.h"
#include "DataFormats/L1Trigger/interface/L1JetParticleFwd.h"
#include "DataFormats/HLTReco/interface/TriggerFilterObjectWithRefs.h"
#include "DataFormats/HcalIsolatedTrack/interface/IsolatedPixelTrackCandidate.h"

// Math
#include "Math/GenVector/VectorUtil.h"
#include "Math/GenVector/PxPyPzE4D.h"

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

#include "DataFormats/Common/interface/Ref.h"
#include "DataFormats/JetReco/interface/Jet.h"

class HITRegionalPixelSeedGenerator : public TrackingRegionProducer {
 public:
  
  explicit HITRegionalPixelSeedGenerator(const edm::ParameterSet& conf_,
    edm::ConsumesCollector && iC)
  {
    edm::LogInfo ("HITRegionalPixelSeedGenerator")<<"Enter the HITRegionalPixelSeedGenerator";
    
    edm::ParameterSet regionPSet = conf_.getParameter<edm::ParameterSet>("RegionPSet");
    
    ptmin=regionPSet.getParameter<double>("ptMin");
    originradius=regionPSet.getParameter<double>("originRadius");
    halflength=regionPSet.getParameter<double>("originHalfLength");
    etaCenter_=regionPSet.getParameter<double>("etaCenter");
    phiCenter_=regionPSet.getParameter<double>("phiCenter");
    deltaTrackEta = regionPSet.getParameter<double>("deltaEtaTrackRegion");
    deltaTrackPhi = regionPSet.getParameter<double>("deltaPhiTrackRegion");
    deltaL1JetEta = regionPSet.getParameter<double>("deltaEtaL1JetRegion");
    deltaL1JetPhi = regionPSet.getParameter<double>("deltaPhiL1JetRegion");
    usejets_ = regionPSet.getParameter<bool>("useL1Jets");
    usetracks_ = regionPSet.getParameter<bool>("useTracks");
    useIsoTracks_ = regionPSet.getParameter<bool>("useIsoTracks");
    fixedReg_ = regionPSet.getParameter<bool>("fixedReg");

    if (usetracks_) token_trks = iC.consumes<reco::TrackCollection>(regionPSet.getParameter<edm::InputTag>("trackSrc"));
    if (usetracks_ || useIsoTracks_ || fixedReg_ || usejets_) 
      token_vertex = iC.consumes<reco::VertexCollection>(regionPSet.getParameter<edm::InputTag>("vertexSrc"));
    if (useIsoTracks_) token_isoTrack = iC.consumes<trigger::TriggerFilterObjectWithRefs>(regionPSet.getParameter<edm::InputTag>("isoTrackSrc"));
    if (usejets_) token_l1jet = iC.consumes<l1extra::L1JetParticleCollection>(regionPSet.getParameter<edm::InputTag>("l1tjetSrc"));
  }

  ~HITRegionalPixelSeedGenerator() override {}
  
  
  std::vector<std::unique_ptr<TrackingRegion> > regions(const edm::Event& e, const edm::EventSetup& es) const override
    {
      std::vector<std::unique_ptr<TrackingRegion> > result;
      float originz =0.;
      
      double deltaZVertex =  halflength;
      
      
      
      if (usetracks_)
    {
      edm::Handle<reco::TrackCollection> tracks;
      e.getByToken(token_trks, tracks);
      
      edm::Handle<reco::VertexCollection> vertices;
      e.getByToken(token_vertex,vertices);
      const reco::VertexCollection vertCollection = *(vertices.product());
      reco::VertexCollection::const_iterator ci = vertCollection.begin();
      
      if(!vertCollection.empty()) 
        {
          originz = ci->z();
        }
      else
        {
          deltaZVertex = 15.;
        }
      
      GlobalVector globalVector(0,0,1);
      if(tracks->empty()) return result;
      
      reco::TrackCollection::const_iterator itr = tracks->begin();
      for(;itr != tracks->end();itr++)
        {
          
          GlobalVector ptrVec((itr)->px(),(itr)->py(),(itr)->pz());
          globalVector = ptrVec;
          
          
          result.push_back(std::make_unique<RectangularEtaPhiTrackingRegion>(globalVector,
                                                                                 GlobalPoint(0,0,originz),
                                                                                 ptmin,
                                                                                 originradius,
                                                                                 deltaZVertex,
                                                                                 deltaTrackEta,
                                                                                 deltaTrackPhi));
        }
    }
      
      if (useIsoTracks_)
        {
          edm::Handle<trigger::TriggerFilterObjectWithRefs> isotracks;
          e.getByToken(token_isoTrack, isotracks);

      std::vector< edm::Ref<reco::IsolatedPixelTrackCandidateCollection> > isoPixTrackRefs;
    
      isotracks->getObjects(trigger::TriggerTrack, isoPixTrackRefs);
      
          edm::Handle<reco::VertexCollection> vertices;
          e.getByToken(token_vertex,vertices);
          const reco::VertexCollection vertCollection = *(vertices.product());
          reco::VertexCollection::const_iterator ci = vertCollection.begin();

          if(!vertCollection.empty()) 
        {
          originz = ci->z();
        }
      else
        {
          deltaZVertex = 15.;
        }
      
          GlobalVector globalVector(0,0,1);
          if(isoPixTrackRefs.empty()) return result;
      
          for(uint32_t p=0; p<isoPixTrackRefs.size(); p++)
            {
              GlobalVector ptrVec((isoPixTrackRefs[p]->track())->px(),(isoPixTrackRefs[p]->track())->py(),(isoPixTrackRefs[p]->track())->pz());
              globalVector = ptrVec;
          
              result.push_back(std::make_unique<RectangularEtaPhiTrackingRegion>(globalVector,
                                                                                 GlobalPoint(0,0,originz),
                                                                                 ptmin,
                                                                                 originradius,
                                                                                 deltaZVertex,
                                                                                 deltaTrackEta,
                                                                                 deltaTrackPhi));
        }
    }
      
      if (usejets_)
    {
      edm::Handle<l1extra::L1JetParticleCollection> jets;
      e.getByToken(token_l1jet, jets);

          edm::Handle<reco::VertexCollection> vertices;
          e.getByToken(token_vertex, vertices);
          const reco::VertexCollection vertCollection = *(vertices.product());
          reco::VertexCollection::const_iterator ci = vertCollection.begin();
          if(!vertCollection.empty()) 
        {
          originz = ci->z();
        }
      else
        {
          deltaZVertex = 15.;
        }

      GlobalVector globalVector(0,0,1);
      if(jets->empty()) return result;
      
      for (l1extra::L1JetParticleCollection::const_iterator iJet = jets->begin(); iJet != jets->end(); iJet++) 
        {
          GlobalVector jetVector(iJet->p4().x(), iJet->p4().y(), iJet->p4().z());
          GlobalPoint  vertex(0, 0, originz);
          
          result.push_back(std::make_unique<RectangularEtaPhiTrackingRegion>( jetVector,
                                                                                  vertex,
                                                                                  ptmin,
                                                                                  originradius,
                                                                                  deltaZVertex,
                                                                                  deltaL1JetEta,
                                                                                  deltaL1JetPhi ));
        }
    }
      if (fixedReg_)
    {
      GlobalVector fixedVector(cos(phiCenter_)*sin(2*atan(exp(-etaCenter_))), sin(phiCenter_)*sin(2*atan(exp(-etaCenter_))), cos(2*atan(exp(-etaCenter_))));
      GlobalPoint  vertex(0, 0, originz);
      
      edm::Handle<reco::VertexCollection> vertices;
      e.getByToken(token_vertex,vertices);
      const reco::VertexCollection vertCollection = *(vertices.product());
      reco::VertexCollection::const_iterator ci = vertCollection.begin();
      if(!vertCollection.empty()) 
        {
          originz = ci->z();
        }
      else
        {
          deltaZVertex = 15.;
        }
      
      result.push_back(std::make_unique<RectangularEtaPhiTrackingRegion>( fixedVector,
                                                                              vertex,
                                                                              ptmin,
                                                                              originradius,
                                                                              deltaZVertex,
                                                                              deltaL1JetEta,
                                                                              deltaL1JetPhi ));
    }
      
      return result;
    }
  
  
 private:
  edm::ParameterSet conf_;
  
  float ptmin;
  float originradius;
  float halflength;
  double etaCenter_;
  double phiCenter_;
  float deltaTrackEta;
  float deltaTrackPhi;
  float deltaL1JetEta;
  float deltaL1JetPhi;
  bool usejets_;
  bool usetracks_;
  bool fixedReg_;
  bool useIsoTracks_;
  edm::EDGetTokenT<reco::TrackCollection> token_trks; 
  edm::EDGetTokenT<reco::VertexCollection> token_vertex; 
  edm::EDGetTokenT<trigger::TriggerFilterObjectWithRefs> token_isoTrack; 
  edm::EDGetTokenT<l1extra::L1JetParticleCollection> token_l1jet; 

};

#endif