/data/refman/pasoursint/CMSSW_6_1_2_SLHC2_patch1/src/RecoEcal/EgammaClusterProducers/src/CleanAndMergeProducer.cc

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// C/C++ headers
#include <iostream>
#include <vector>
#include <memory>

// Framework
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "DataFormats/Common/interface/Handle.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/Framework/interface/ESHandle.h"
// Reconstruction Classes
#include "DataFormats/EcalRecHit/interface/EcalRecHit.h"
#include "DataFormats/EcalRecHit/interface/EcalRecHitCollections.h"
#include "DataFormats/EcalDetId/interface/EBDetId.h"
#include "DataFormats/EgammaReco/interface/BasicCluster.h"
#include "DataFormats/EgammaReco/interface/SuperCluster.h"
#include "DataFormats/EgammaReco/interface/SuperClusterFwd.h"
#include "DataFormats/EgammaReco/interface/BasicClusterFwd.h"
#include "CondFormats/DataRecord/interface/EcalChannelStatusRcd.h"
#include "CondFormats/EcalObjects/interface/EcalChannelStatus.h"

// Geometry
#include "Geometry/Records/interface/CaloGeometryRecord.h"
#include "Geometry/CaloGeometry/interface/CaloSubdetectorGeometry.h"
#include "Geometry/CaloGeometry/interface/CaloCellGeometry.h"
#include "Geometry/CaloGeometry/interface/CaloGeometry.h"
#include "Geometry/CaloTopology/interface/EcalBarrelTopology.h"
#include "Geometry/CaloTopology/interface/EcalEndcapTopology.h"
#include "Geometry/CaloTopology/interface/EcalPreshowerTopology.h"

// Class header file
#include "RecoEcal/EgammaClusterProducers/interface/CleanAndMergeProducer.h"
#include "RecoEcal/EgammaCoreTools/interface/PositionCalc.h"
#include "DataFormats/CaloRecHit/interface/CaloCluster.h"


/*
CleanAndMergeProducer:
^^^^^^^^^^^^^^^^^^^^^^

Takes  as  input the cleaned  and the  uncleaned collection of SC
and produces an uncleaned collection of SC without the duplicates
and  a collection of  references  to the cleaned collection of SC

25 June 2010
Nikolaos Rompotis and Chris Seez  - Imperial College London
many thanks to Shahram Rahatlou and Federico Ferri


*/


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

        // get the parameters
        // the cleaned collection:
        cleanScInputTag_   = ps.getParameter<edm::InputTag>("cleanScInputTag");
        uncleanScInputTag_ = ps.getParameter<edm::InputTag>("uncleanScInputTag");          

        // the names of the products to be produced:
        bcCollection_ = ps.getParameter<std::string>("bcCollection");
        scCollection_ = ps.getParameter<std::string>("scCollection");
        refScCollection_ = ps.getParameter<std::string>("refScCollection");

        std::map<std::string,double> providedParameters;  
        providedParameters.insert(std::make_pair("LogWeighted",ps.getParameter<bool>("posCalc_logweight")));
        providedParameters.insert(std::make_pair("T0_barl",ps.getParameter<double>("posCalc_t0")));
        providedParameters.insert(std::make_pair("W0",ps.getParameter<double>("posCalc_w0")));
        providedParameters.insert(std::make_pair("X0",ps.getParameter<double>("posCalc_x0")));

        hitproducer_ = ps.getParameter<std::string>("ecalhitproducer");
        hitcollection_ =ps.getParameter<std::string>("ecalhitcollection");

        // the products:
        produces< reco::BasicClusterCollection >(bcCollection_);
        produces< reco::SuperClusterCollection >(scCollection_);
        produces< reco::SuperClusterRefVector >(refScCollection_);

}

CleanAndMergeProducer::~CleanAndMergeProducer() {;}

void CleanAndMergeProducer::produce(edm::Event& evt, 
                                    const edm::EventSetup& es)
{
        // get the input collections
        // ______________________________________________________________________________________
        //
        // cluster collections:

        edm::Handle<reco::SuperClusterCollection> pCleanSC;
        edm::Handle<reco::SuperClusterCollection> pUncleanSC;

        evt.getByLabel(cleanScInputTag_, pCleanSC);
        if (!(pCleanSC.isValid())) 
        {
          edm::LogWarning("MissingInput")<< "could not get a handle on the clean Super Clusters!";
          return;
        }

        evt.getByLabel(uncleanScInputTag_, pUncleanSC);
        if (!(pUncleanSC.isValid())) 
        {
          
          edm::LogWarning("MissingInput")<< "could not get a handle on the unclean Super Clusters!";
          return;
        }

        //
        // collections are all taken now _____________________________________________________
        //
        //
        // the collections to be produced:
        reco::BasicClusterCollection basicClusters;
        reco::SuperClusterCollection superClusters;
        reco::SuperClusterRefVector * scRefs = new reco::SuperClusterRefVector;

        //
        // run over the uncleaned SC and check how many of them are matched to the cleaned ones
        // if you find a matched one, create a reference to the cleaned collection and store it
        // if you find an unmatched one, then keep all its basic clusters in the basic Clusters 
        // vector
        int uncleanSize =  pUncleanSC->size();
        int cleanSize =    pCleanSC->size();

        LogTrace("EcalCleaning") << "Size of Clean Collection: " << cleanSize 
                << ", uncleanSize: " << uncleanSize  << std::endl;
        //
        // keep whether the SC in unique in the uncleaned collection
        std::vector<int> isUncleanOnly;     // 1 if unique in the uncleaned
        std::vector<int> basicClusterOwner; // contains the index of the SC that owns that BS
        std::vector<int> isSeed; // if this basic cluster is a seed it is 1
        for (int isc =0; isc< uncleanSize; ++isc) {
          reco::SuperClusterRef unscRef( pUncleanSC, isc );    
          const std::vector< std::pair<DetId, float> > & uhits = unscRef->hitsAndFractions();
          int uhitsSize = uhits.size();
          bool foundTheSame = false;
          for (int jsc=0; jsc < cleanSize; ++jsc) { // loop over the cleaned SC
            reco::SuperClusterRef cscRef( pCleanSC, jsc );
            const std::vector< std::pair<DetId, float> > & chits = cscRef->hitsAndFractions();
            int chitsSize =  chits.size();
            foundTheSame = true;
            if (unscRef->seed()->seed() == cscRef->seed()->seed() && chitsSize == uhitsSize) { 
              // if the clusters are exactly the same then because the clustering
              // algorithm works in a deterministic way, the order of the rechits
              // will be the same
              for (int i=0; i< chitsSize; ++i) {
                if (uhits[i].first != chits[i].first ) { foundTheSame=false;  break;}
              }
              if (foundTheSame) { // ok you have found it!
                // make the reference
                //scRefs->push_back( edm::Ref<reco::SuperClusterCollection>(pCleanSC, jsc) );
                scRefs->push_back( cscRef );
                isUncleanOnly.push_back(0);
                break;
              }
            }
          }
          if (not foundTheSame) {
            // mark it as unique in the uncleaned
            isUncleanOnly.push_back(1);
            // keep all its basic clusters
            for (reco::CaloCluster_iterator bciter = unscRef->clustersBegin(); bciter != unscRef->clustersEnd(); ++bciter) {
              // the basic clusters
              basicClusters.push_back(**bciter);
              basicClusterOwner.push_back(isc);
            }
          }
        }
        int bcSize =  basicClusters.size();
        
        LogDebug("EcalCleaning") << "Found cleaned SC: " << cleanSize <<  " uncleaned SC: " 
                << uncleanSize << " from which " << scRefs->size() 
                << " will become refs to the cleaned collection" ;
     

        // now you have the collection of basic clusters of the SC to be remain in the
        // in the clean collection, export them to the event
        // you will need to reread them later in order to make correctly the refs to the SC
        std::auto_ptr< reco::BasicClusterCollection> basicClusters_p(new reco::BasicClusterCollection);
        basicClusters_p->assign(basicClusters.begin(), basicClusters.end());
        edm::OrphanHandle<reco::BasicClusterCollection> bccHandle =  
                evt.put(basicClusters_p, bcCollection_);
        if (!(bccHandle.isValid())) {
          edm::LogWarning("MissingInput")<<"could not get a handle on the BasicClusterCollection!" << std::endl;
          return;
        }

        LogDebug("EcalCleaning")<< "Got the BasicClusters from the event again";
        // now you have to create again your superclusters
        // you run over the uncleaned SC, but now you know which of them are
        // the ones that are needed and which are their basic clusters
        for (int isc=0; isc< uncleanSize; ++isc) {
          if (isUncleanOnly[isc]==1) { // look for sc that are unique in the unclean collection
            // make the basic cluster collection
            reco::CaloClusterPtrVector clusterPtrVector;
            reco::CaloClusterPtr seed; // the seed is the basic cluster with the highest energy
            double energy = -1;
            for (int jbc=0; jbc< bcSize; ++jbc) {
              if (basicClusterOwner[jbc]==isc) {
                reco::CaloClusterPtr currentClu = reco::CaloClusterPtr(bccHandle, jbc);
                clusterPtrVector.push_back(currentClu);
                if (energy< currentClu->energy()) {
                  energy = currentClu->energy(); seed = currentClu;
                }
              }
            }
            reco::SuperClusterRef unscRef( pUncleanSC, isc ); 
            reco::SuperCluster newSC(unscRef->energy(), unscRef->position(), seed, clusterPtrVector );
            superClusters.push_back(newSC);
          }
          
        }
        // export the collection of references to the clean collection
        std::auto_ptr< reco::SuperClusterRefVector >  scRefs_p( scRefs );
        evt.put(scRefs_p, refScCollection_);

        // the collection of basic clusters is already in the event
        // the collection of uncleaned SC
        std::auto_ptr< reco::SuperClusterCollection > superClusters_p(new reco::SuperClusterCollection);
        superClusters_p->assign(superClusters.begin(), superClusters.end());
        evt.put(superClusters_p, scCollection_);
        LogDebug("EcalCleaning")<< "Hybrid Clusters (Basic/Super) added to the Event! :-)";
}