/data/refman/pasoursint/CMSSW_6_1_2_SLHC2/src/RecoBTau/JetCrystalsAssociator/src/JetCrystalsAssociator.cc

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// -*- C++ -*-
//
// Package:    JetCrystalsAssociator
// Class:      JetCrystalsAssociator
// 
//
// Original Author:  Simone Gennai
//         Created:  Wed Apr 12 11:12:49 CEST 2006
//
//


// system include files
#include <memory>
#include <string>
#include <iostream>
#include "FWCore/MessageLogger/interface/MessageLogger.h"

// user include files
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/InputTag.h"
#include "FWCore/Framework/interface/ESHandle.h"


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

//Calorimeter stuff
#include "DataFormats/CaloTowers/interface/CaloTowerCollection.h"
#include "DataFormats/DetId/interface/DetId.h"
#include "DataFormats/EgammaReco/interface/BasicCluster.h"
#include "DataFormats/EcalDetId/interface/EcalSubdetector.h"

#include "DataFormats/CaloTowers/interface/CaloTowerDetId.h" 
#include "DataFormats/EcalDetId/interface/EBDetId.h"
#include "DataFormats/EcalDetId/interface/EEDetId.h"
#include "DataFormats/EcalRecHit/interface/EcalRecHitCollections.h"

#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "Geometry/CaloGeometry/interface/CaloSubdetectorGeometry.h"
#include "Geometry/CaloGeometry/interface/CaloGeometry.h"
#include "Geometry/CaloGeometry/interface/CaloCellGeometry.h"
#include "Geometry/Records/interface/CaloGeometryRecord.h"

// Math
#include "Math/GenVector/VectorUtil.h"
#include "Math/GenVector/PxPyPzE4D.h"
using namespace reco;

//
// class decleration
//

class JetCrystalsAssociator : public edm::EDProducer {

   public:
      explicit JetCrystalsAssociator(const edm::ParameterSet&);
      ~JetCrystalsAssociator();


      virtual void produce(edm::Event&, const edm::EventSetup&);
   private:
      std::auto_ptr<JetCrystalsAssociationCollection> associate( 
          const edm::Handle<CaloJetCollection> & jets,
          const edm::OrphanHandle<EMLorentzVectorCollection> & myLorentzRecHits) const;


  // ----------member data ---------------------------
  edm::InputTag m_jetsSrc;
  edm::InputTag m_EBRecHits;
  edm::InputTag m_EERecHits;

  double m_deltaRCut;
};

JetCrystalsAssociator::JetCrystalsAssociator(const edm::ParameterSet& iConfig)
{
  produces<reco::JetCrystalsAssociationCollection>();
  produces<reco::EMLorentzVectorCollection>();

  m_EBRecHits = iConfig.getParameter<edm::InputTag>("EBRecHits");
  m_EERecHits = iConfig.getParameter<edm::InputTag>("EERecHits");
  m_jetsSrc   = iConfig.getParameter<edm::InputTag>("jets");
  m_deltaRCut = iConfig.getParameter<double>("coneSize");
}


JetCrystalsAssociator::~JetCrystalsAssociator()
{
 
  // do anything here that needs to be done at desctruction time
  // (e.g. close files, deallocate resources etc.)

}


//
// member functions
//

// ------------ method called to produce the data  ------------
void
JetCrystalsAssociator::produce(edm::Event& iEvent, const edm::EventSetup& iSetup)
{
  using namespace edm;
  using namespace reco;
  using namespace std;

  // geometry initialization
  ESHandle<CaloGeometry> geometry;
  iSetup.get<CaloGeometryRecord>().get(geometry);
  
  const CaloSubdetectorGeometry* EB = geometry->getSubdetectorGeometry(DetId::Ecal,EcalBarrel);
   const CaloSubdetectorGeometry* EE = geometry->getSubdetectorGeometry(DetId::Ecal,EcalEndcap);
   // end 
   
   Handle<CaloJetCollection> jets;
   iEvent.getByLabel(m_jetsSrc, jets);
   
   // get calo towers collection
   //   Handle<CaloTowerCollection> caloTowers; 
   //   iEvent.getByLabel(m_towersSrc, caloTowers);

   // calculation of ECAL isolation
   Handle<EBRecHitCollection> EBRecHits;
   Handle<EERecHitCollection> EERecHits;
   iEvent.getByLabel( m_EBRecHits, EBRecHits );
   iEvent.getByLabel( m_EERecHits, EERecHits );
   
   std::auto_ptr<EMLorentzVectorCollection> jetRecHits( new EMLorentzVectorCollection() );
   //loop on jets and associate
   for (size_t t = 0; t < jets->size(); t++)
    {
      const std::vector<CaloTowerPtr>  myTowers=(*jets)[t].getCaloConstituents();
      //      cout <<"Jet id "<<t<<endl;
      //      cout <<"Tower size "<<myTowers.size()<<endl;
      for (unsigned int iTower = 0; iTower < myTowers.size(); iTower++)
        {
          CaloTowerPtr theTower = myTowers[iTower];
          size_t numRecHits = theTower->constituentsSize();
        // access CaloRecHits
        for (size_t j = 0; j < numRecHits; j++) {
          DetId RecHitDetID=theTower->constituent(j);
          DetId::Detector DetNum=RecHitDetID.det();
          if( DetNum == DetId::Ecal ){
            int EcalNum =  RecHitDetID.subdetId();
            if( EcalNum == 1 ){
              EBDetId EcalID = RecHitDetID;
              EBRecHitCollection::const_iterator theRecHit=EBRecHits->find(EcalID);
              if(theRecHit != EBRecHits->end()){
                DetId id = theRecHit->detid();
                const CaloCellGeometry* this_cell = EB->getGeometry(id);
                if (this_cell) {
                  GlobalPoint posi = this_cell->getPosition();
                  double energy = theRecHit->energy();
                  double eta = posi.eta();
                  double phi = posi.phi();
                  double theta = posi.theta();
                  if(theta > M_PI) theta = 2 * M_PI- theta;
                  double et = energy * sin(theta);
                  // cout <<"Et "<<et<<endl;
                  EMLorentzVector p(et, eta, phi, energy);
                  jetRecHits->push_back(p);
                }
              }
            } else if ( EcalNum == 2 ) {
              EEDetId EcalID = RecHitDetID;
              EERecHitCollection::const_iterator theRecHit=EERecHits->find(EcalID);         
              if(theRecHit != EBRecHits->end()){
                DetId id = theRecHit->detid();
                const CaloCellGeometry* this_cell = EE->getGeometry(id);
                if (this_cell) {
                  GlobalPoint posi = this_cell->getPosition();
                  double energy = theRecHit->energy();
                  double eta = posi.eta();
                  double phi = posi.phi();
                  double theta = posi.theta();
                  if (theta > M_PI) theta = 2 * M_PI - theta;
                  double et = energy * sin(theta);
                  // cout <<"Et "<<et<<endl;
                  EMLorentzVector p(et, eta, phi, energy);
                  jetRecHits->push_back(p);
                }
              }
            }
          }
        }
      }
    }

  edm::OrphanHandle <reco::EMLorentzVectorCollection> myRecHits = iEvent.put(jetRecHits);

  std::auto_ptr<JetCrystalsAssociationCollection> jetCrystals = associate(jets,myRecHits);
  iEvent.put( jetCrystals );
}

std::auto_ptr<JetCrystalsAssociationCollection> JetCrystalsAssociator::associate( 
        const edm::Handle<CaloJetCollection> & jets,
        const edm::OrphanHandle<EMLorentzVectorCollection> & myLorentzRecHits) const
{
  // we know we will save an element per input jet
  std::auto_ptr<JetCrystalsAssociationCollection> outputCollection( new JetCrystalsAssociationCollection( jets->size() ) );

  //loop on jets and associate
  for (size_t j = 0; j < jets->size(); j++) {
    (*outputCollection)[j].first = edm::RefToBase<Jet>(CaloJetRef(jets, j));
    for (size_t t = 0; t < myLorentzRecHits->size(); t++) {
      double delta = ROOT::Math::VectorUtil::DeltaR((*jets)[j].p4().Vect(), (*myLorentzRecHits)[t]);
      if (delta < m_deltaRCut)
        (*outputCollection)[j].second.push_back( EMLorentzVectorRef(myLorentzRecHits, t) );
    }
  }  
  return outputCollection;
}

//define this as a plug-in
DEFINE_FWK_MODULE(JetCrystalsAssociator);