/data/refman/pasoursint/CMSSW_4_1_8_patch9/src/RecoEcal/EgammaClusterProducers/src/PreshowerClusterProducer.cc

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// system include files
#include <vector>
#include <memory>

// user include files
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/EDAnalyzer.h"

#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "DataFormats/Common/interface/Handle.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/Utilities/interface/Exception.h"

// Reconstruction Classes
#include "DataFormats/EcalRecHit/interface/EcalRecHit.h"
#include "DataFormats/EcalRecHit/interface/EcalRecHitCollections.h"
#include "DataFormats/EgammaReco/interface/SuperCluster.h"
#include "DataFormats/EgammaReco/interface/SuperClusterFwd.h"
#include "DataFormats/EgammaReco/interface/PreshowerClusterFwd.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "Geometry/CaloGeometry/interface/CaloSubdetectorGeometry.h"
#include "Geometry/CaloGeometry/interface/CaloGeometry.h"
#include "Geometry/CaloGeometry/interface/CaloCellGeometry.h"
#include "Geometry/CaloGeometry/interface/TruncatedPyramid.h"
#include "Geometry/EcalAlgo/interface/EcalPreshowerGeometry.h"
#include "Geometry/CaloTopology/interface/EcalPreshowerTopology.h"
#include "Geometry/Records/interface/CaloGeometryRecord.h"
#include "DataFormats/HcalDetId/interface/HcalDetId.h"
#include "DataFormats/EcalDetId/interface/EcalSubdetector.h"
#include "DataFormats/EcalDetId/interface/EBDetId.h"
#include "DataFormats/EcalDetId/interface/EEDetId.h"
#include "DataFormats/EcalDetId/interface/ESDetId.h"
#include "CondFormats/DataRecord/interface/ESGainRcd.h"
#include "CondFormats/DataRecord/interface/ESMIPToGeVConstantRcd.h"
#include "CondFormats/DataRecord/interface/ESEEIntercalibConstantsRcd.h"
#include <fstream>

#include "RecoEcal/EgammaClusterProducers/interface/PreshowerClusterProducer.h"


using namespace edm;
using namespace std;


PreshowerClusterProducer::PreshowerClusterProducer(const edm::ParameterSet& ps) {

  // use configuration file to setup input/output collection names 
  preshHitProducer_   = ps.getParameter<edm::InputTag>("preshRecHitProducer");

  // Name of a SuperClusterCollection to make associations:
  endcapSClusterProducer_   = ps.getParameter<edm::InputTag>("endcapSClusterProducer");

  // Output collections:
  preshClusterCollectionX_ = ps.getParameter<std::string>("preshClusterCollectionX");
  preshClusterCollectionY_ = ps.getParameter<std::string>("preshClusterCollectionY");
  preshNclust_             = ps.getParameter<int>("preshNclust");

  etThresh_ =  ps.getParameter<double>("etThresh");

  assocSClusterCollection_ = ps.getParameter<std::string>("assocSClusterCollection");

  produces< reco::PreshowerClusterCollection >(preshClusterCollectionX_);
  produces< reco::PreshowerClusterCollection >(preshClusterCollectionY_);
  produces< reco::SuperClusterCollection >(assocSClusterCollection_);

  float preshStripECut = ps.getParameter<double>("preshStripEnergyCut");
    int preshSeededNst = ps.getParameter<int>("preshSeededNstrip");
  preshClustECut = ps.getParameter<double>("preshClusterEnergyCut");

  // The debug level
  std::string debugString = ps.getParameter<std::string>("debugLevel");
  if      (debugString == "DEBUG")   debugL = PreshowerClusterAlgo::pDEBUG;
  else if (debugString == "INFO")    debugL = PreshowerClusterAlgo::pINFO;
  else                               debugL = PreshowerClusterAlgo::pERROR;

  presh_algo = new PreshowerClusterAlgo(preshStripECut,preshClustECut,preshSeededNst,debugL);

  nEvt_ = 0;  

}


PreshowerClusterProducer::~PreshowerClusterProducer() {
   delete presh_algo;
}


void PreshowerClusterProducer::produce(edm::Event& evt, const edm::EventSetup& es) {

  edm::Handle< EcalRecHitCollection >   pRecHits;
  edm::Handle< reco::SuperClusterCollection > pSuperClusters;

  // get the ECAL geometry:
  edm::ESHandle<CaloGeometry> geoHandle;
  es.get<CaloGeometryRecord>().get(geoHandle);

  // retrieve ES-EE intercalibration constants
  set(es);

  const CaloSubdetectorGeometry *geometry = geoHandle->getSubdetectorGeometry(DetId::Ecal, EcalPreshower);
  const CaloSubdetectorGeometry *& geometry_p = geometry;

   // create auto_ptr to a PreshowerClusterCollection
   std::auto_ptr< reco::PreshowerClusterCollection > clusters_p1(new reco::PreshowerClusterCollection);
   std::auto_ptr< reco::PreshowerClusterCollection > clusters_p2(new reco::PreshowerClusterCollection);
   // create new collection of corrected super clusters
   std::auto_ptr< reco::SuperClusterCollection > superclusters_p(new reco::SuperClusterCollection);

   CaloSubdetectorTopology * topology_p=0;
   if (geometry)
     topology_p  = new EcalPreshowerTopology(geoHandle);

   // fetch the product (pSuperClusters)
   evt.getByLabel(endcapSClusterProducer_, pSuperClusters);   
   const reco::SuperClusterCollection* SClusts = pSuperClusters.product();
   if ( debugL <= PreshowerClusterAlgo::pINFO ) std::cout <<"### Total # Endcap Superclusters: " << SClusts->size() << std::endl;
   
   // fetch the product (RecHits)
   evt.getByLabel( preshHitProducer_, pRecHits);
   // pointer to the object in the product
   const EcalRecHitCollection* rechits = pRecHits.product(); // EcalRecHitCollection hit_collection = *rhcHandle;
   if ( debugL == PreshowerClusterAlgo::pDEBUG ) std::cout << "PreshowerClusterProducerInfo: ### Total # of preshower RecHits: " 
                                                           << rechits->size() << std::endl;

  // make the map of rechits:
   std::map<DetId, EcalRecHit> rechits_map;
   EcalRecHitCollection::const_iterator it;
   for (it = rechits->begin(); it != rechits->end(); it++) {
     // remove bad ES rechits
     if (it->recoFlag()==14 || (it->recoFlag()<=10 && it->recoFlag()>=5)) continue;
     //Make the map of DetID, EcalRecHit pairs
     rechits_map.insert(std::make_pair(it->id(), *it));   
   }
   // The set of used DetID's for a given event:
   std::set<DetId> used_strips;
   used_strips.clear();
   
  if ( debugL <= PreshowerClusterAlgo::pINFO ) std::cout << "PreshowerClusterProducerInfo: ### rechits_map of size " 
                                                         << rechits_map.size() <<" was created!" << std::endl;   
  
  reco::PreshowerClusterCollection clusters1, clusters2;   // output collection of corrected PCs
  reco::SuperClusterCollection new_SC; // output collection of corrected SCs

  if ( debugL == PreshowerClusterAlgo::pDEBUG ) std::cout << " Making a cycle over Superclusters ..." << std::endl; 
  //make cycle over super clusters
  reco::SuperClusterCollection::const_iterator it_super;
  int isc = 0;
  for ( it_super=SClusts->begin();  it_super!=SClusts->end(); it_super++ ) {     
       float e1=0;
       float e2=0;
       float deltaE=0;
       reco::CaloClusterPtrVector new_BC; 
       ++isc;

       if ( debugL <= PreshowerClusterAlgo::pINFO ) std::cout << " superE = " << it_super->energy() << " superETA = " << it_super->eta() 
                                                       << " superPHI = " << it_super->phi() << std::endl;
       if ( debugL == PreshowerClusterAlgo::pINFO ) std::cout << " This SC contains " << it_super->clustersSize() << " BCs" << std::endl;

       reco::CaloCluster_iterator bc_iter = it_super->clustersBegin();
       for ( ; bc_iter !=it_super->clustersEnd(); ++bc_iter ) {  
         if (geometry)
           {
             // Get strip position at intersection point of the line EE - Vertex:
             double X = (*bc_iter)->x();
             double Y = (*bc_iter)->y();
             double Z = (*bc_iter)->z();        
             const GlobalPoint point(X,Y,Z);    
             
             DetId tmp1 = (dynamic_cast<const EcalPreshowerGeometry*>(geometry_p))->getClosestCellInPlane(point, 1);
             DetId tmp2 = (dynamic_cast<const EcalPreshowerGeometry*>(geometry_p))->getClosestCellInPlane(point, 2);
             ESDetId strip1 = (tmp1 == DetId(0)) ? ESDetId(0) : ESDetId(tmp1);
             ESDetId strip2 = (tmp2 == DetId(0)) ? ESDetId(0) : ESDetId(tmp2);     
             
             if ( debugL <= PreshowerClusterAlgo::pINFO ) {
               if ( strip1 != ESDetId(0) && strip2 != ESDetId(0) ) {
                 std::cout << " Intersected preshower strips are: " << std::endl;
                 std::cout << strip1 << std::endl;
                 std::cout << strip2 << std::endl;
               }
               else if ( strip1 == ESDetId(0) )
                 std::cout << " No intersected strip in plane 1 " << std::endl;
               else if ( strip2 == ESDetId(0) )
                 std::cout << " No intersected strip in plane 2 " << std::endl;
             }        
             
             // Get a vector of ES clusters (found by the PreshSeeded algorithm) associated with a given EE basic cluster.           
             for (int i=0; i<preshNclust_; i++) {
               reco::PreshowerCluster cl1 = presh_algo->makeOneCluster(strip1,&used_strips,&rechits_map,geometry_p,topology_p);   
               cl1.setBCRef(*bc_iter);
               if ( cl1.energy() > preshClustECut) {
                 clusters1.push_back(cl1);
                 e1 += cl1.energy();       
               }
               reco::PreshowerCluster cl2 = presh_algo->makeOneCluster(strip2,&used_strips,&rechits_map,geometry_p,topology_p); 
               cl2.setBCRef(*bc_iter);
               
               if ( cl2.energy() > preshClustECut) {
                 clusters2.push_back(cl2);
                 e2 += cl2.energy();
               }                                       
             } // end of cycle over ES clusters
           }
         new_BC.push_back(*bc_iter);
       }  // end of cycle over BCs
       
       if ( debugL <= PreshowerClusterAlgo::pINFO ) std::cout << " For SC #" << isc-1 << ", containing " << it_super->clustersSize() 
                                                              << " basic clusters, PreshowerClusterAlgo made " 
                                                              << clusters1.size() << " in X plane and " << clusters2.size() 
                                                              << " in Y plane " << " preshower clusters " << std::endl;
       
       // update energy of the SuperCluster    
       if(e1+e2 > 1.0e-10) {
         // GeV to #MIPs
         e1 = e1 / mip_;
         e2 = e2 / mip_;
         deltaE = gamma_*(e1+alpha_*e2);       
       }
       
       //corrected Energy
       float E = it_super->energy() + deltaE;
       
       if ( debugL == PreshowerClusterAlgo::pDEBUG ) std::cout << " Creating corrected SC " << std::endl;
       reco::SuperCluster sc( E, it_super->position(), it_super->seed(), new_BC, deltaE);
 
      if(sc.energy()*sin(sc.position().theta())>etThresh_)
         new_SC.push_back(sc);
       if ( debugL <= PreshowerClusterAlgo::pINFO ) std::cout << " SuperClusters energies: new E = " << sc.energy() 
                                        << " vs. old E =" << it_super->energy() << std::endl;

   } // end of cycle over SCs
  


   // copy the preshower clusters into collections and put in the Event:
   clusters_p1->assign(clusters1.begin(), clusters1.end());
   clusters_p2->assign(clusters2.begin(), clusters2.end());
   // put collection of preshower clusters to the event
   evt.put( clusters_p1, preshClusterCollectionX_ );
   evt.put( clusters_p2, preshClusterCollectionY_ );
   if ( debugL <= PreshowerClusterAlgo::pINFO ) std::cout << "Preshower clusters added to the event" << std::endl;

   // put collection of corrected super clusters to the event
   superclusters_p->assign(new_SC.begin(), new_SC.end());
   evt.put(superclusters_p, assocSClusterCollection_);
   if ( debugL <= PreshowerClusterAlgo::pINFO ) std::cout << "Corrected SClusters added to the event" << std::endl;

   if (topology_p)
     delete topology_p;

   nEvt_++;

}

void PreshowerClusterProducer::set(const edm::EventSetup& es) {

  es.get<ESGainRcd>().get(esgain_);
  const ESGain *gain = esgain_.product();

  es.get<ESMIPToGeVConstantRcd>().get(esMIPToGeV_);
  const ESMIPToGeVConstant *mipToGeV = esMIPToGeV_.product();

  es.get<ESEEIntercalibConstantsRcd>().get(esEEInterCalib_);
  const ESEEIntercalibConstants *esEEInterCalib = esEEInterCalib_.product();

  double ESGain = gain->getESGain();
  mip_ = (ESGain == 1) ? mipToGeV->getESValueLow() : mipToGeV->getESValueHigh(); 
  gamma_ = (ESGain == 1) ? esEEInterCalib->getGammaLow0() : esEEInterCalib->getGammaHigh0();
  alpha_ = (ESGain == 1) ? esEEInterCalib->getAlphaLow0() : esEEInterCalib->getAlphaHigh0();
}