/data/refman/pasoursint/CMSSW_6_1_2_SLHC4_patch1/src/RecoParticleFlow/PFClusterTools/plugins/CalibratableTest.cc

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#include "RecoParticleFlow/PFClusterTools/interface/CalibratableTest.h"
#include "DataFormats/ParticleFlowReco/interface/PFSimParticle.h"
#include "DataFormats/ParticleFlowReco/interface/PFSimParticleFwd.h"
#include "DataFormats/ParticleFlowReco/interface/PFRecHit.h"
#include "DataFormats/ParticleFlowReco/interface/PFRecHitFwd.h"
#include "DataFormats/ParticleFlowCandidate/interface/PFCandidateFwd.h"
#include "DataFormats/ParticleFlowCandidate/interface/PFCandidate.h"
#include "DataFormats/ParticleFlowReco/interface/PFBlockElementFwd.h"
#include "DataFormats/ParticleFlowReco/interface/PFBlockElementCluster.h"
#include "DataFormats/ParticleFlowReco/interface/PFBlock.h"
#include "DataFormats/ParticleFlowReco/interface/PFRecTrackFwd.h"
#include "DataFormats/ParticleFlowReco/interface/PFTrack.h"
#include "DataFormats/ParticleFlowReco/interface/PFNuclearInteraction.h"
#include "DataFormats/ParticleFlowReco/interface/PFClusterFwd.h"
#include "DataFormats/ParticleFlowReco/interface/PFCluster.h"
#include "DataFormats/ParticleFlowReco/interface/PFRecHitFraction.h"
#include "DataFormats/TrackReco/interface/TrackFwd.h"
#include "DataFormats/Math/interface/LorentzVector.h"

using namespace edm;
using namespace pftools;
using namespace reco;

CalibratableTest::CalibratableTest(const edm::ParameterSet& parameters) :
        debug_(0), nParticleWrites_(0), nParticleFails_(0), nEventWrites_(0), nEventFails_(0),
                         deltaRCandToSim_(0.4) {

        std::cout << __PRETTY_FUNCTION__ << std::endl;
        
        /* This procedure is GENERIC to storing any dictionary enable class in a ROOT tree. */
        tree_ = fileservice_->make<TTree>("CalibratableTest", "");
        calib_ = new Calibratable();
        tree_->Branch("Calibratable", "pftools::Calibratable", &calib_, 32000, 2);
        
        inputTagCandidates_= parameters.getParameter<InputTag>("PFCandidates");
        inputTagSimParticles_= parameters.getParameter<InputTag>("PFSimParticles");
        inputTagClustersEcal_= parameters.getParameter<InputTag>("PFClustersEcal");
        inputTagClustersHcal_= parameters.getParameter<InputTag>("PFClustersHcal");
        deltaRCandToSim_ = parameters.getParameter<double>("deltaRCandToSim");
        debug_= parameters.getParameter<int>("debug");
}

CalibratableTest::~CalibratableTest() {

}

void CalibratableTest::beginJob() {
        if (debug_ > 1)
                std::cout << __PRETTY_FUNCTION__ << "\n";

}

void CalibratableTest::analyze(const edm::Event& event,
                const edm::EventSetup& iSetup) {
        if (debug_ > 1)
                std::cout << __PRETTY_FUNCTION__ << "\n";

        //Extract new collection references
        pfCandidates_ = new Handle<PFCandidateCollection>;
        simParticles_ = new Handle<PFSimParticleCollection>;
        clustersEcal_ = new Handle<PFClusterCollection>;
        clustersHcal_ = new Handle<PFClusterCollection>;

        getCollection(*pfCandidates_, inputTagCandidates_, event);
        getCollection(*simParticles_, inputTagSimParticles_, event);
        getCollection(*clustersEcal_, inputTagClustersEcal_, event);
        getCollection(*clustersHcal_, inputTagClustersHcal_, event);

        //Reset calibratable branch
        thisEventPasses_ = true;
        thisParticlePasses_ = true;
        calib_->reset();

        if (debug_ > 1)
                std::cout << "\tStarting event..."<< std::endl;

        PFSimParticleCollection sims = **simParticles_;
        PFCandidateCollection candidates = **pfCandidates_;
        PFClusterCollection clustersEcal = **clustersEcal_;
        PFClusterCollection clustersHcal = **clustersHcal_;

        if (sims.size() == 0) {
                std::cout << "\tNo sim particles found!" << std::endl;
                thisEventPasses_ = false;
        }

        //Find primary pions in the event
        std::vector<unsigned> primarySims = findPrimarySimParticles(sims);
        if (debug_) {
                std::cout << "\tFound "<< primarySims.size()
                                << " primary sim particles, "<< (**pfCandidates_).size() << " pfCandidates\n";
        }
        for (std::vector<unsigned>::const_iterator cit = primarySims.begin(); cit
                        != primarySims.end(); ++cit) {
                //There will be one write to the tree for each pion found.
                if (debug_ > 1)
                        std::cout << "\t**Starting particle...**\n";
                const PFSimParticle& sim = sims[*cit];
                //One sim per calib =>
                calib_->sim_numEvent_ = 1;
                calib_->sim_isMC_ = true;
                calib_->sim_energyEvent_ = sim.trajectoryPoint(PFTrajectoryPoint::ClosestApproach).momentum().E();
                calib_->sim_phi_ = sim.trajectoryPoint(PFTrajectoryPoint::ClosestApproach).momentum().Phi();
                calib_->sim_eta_ = sim.trajectoryPoint(PFTrajectoryPoint::ClosestApproach).momentum().Eta();

                if (sim.nTrajectoryPoints() > PFTrajectoryPoint::ECALEntrance) {
                        calib_->sim_etaEcal_ = sim.trajectoryPoint(PFTrajectoryPoint::ECALEntrance).positionREP().Eta();
                        calib_->sim_phiEcal_ = sim.trajectoryPoint(PFTrajectoryPoint::ECALEntrance).positionREP().Phi();
                }
                if (sim.nTrajectoryPoints() > PFTrajectoryPoint::HCALEntrance) {
                        calib_->sim_etaHcal_ = sim.trajectoryPoint(PFTrajectoryPoint::HCALEntrance).positionREP().Eta();
                        calib_->sim_phiHcal_ = sim.trajectoryPoint(PFTrajectoryPoint::HCALEntrance).positionREP().Phi();
                }

                // Find candidates near this sim particle
                std::vector<unsigned> matchingCands = findCandidatesInDeltaR(sim,
                                candidates, deltaRCandToSim_);
                if (debug_ > 3)
                        std::cout << "\t\tFound candidates near sim, found "
                                        << matchingCands.size()<< " of them.\n";
                if (matchingCands.size() == 0)
                        thisParticlePasses_ = false;
                for (std::vector<unsigned>::const_iterator mcIt = matchingCands.begin(); mcIt
                                != matchingCands.end(); ++mcIt) {
                        const PFCandidate& theCand = candidates[*mcIt];
                        extractCandidate(theCand);
                }
                //Finally,
                fillTreeAndReset();
                
        }

        delete pfCandidates_;
        delete simParticles_;
        delete clustersEcal_;
        delete clustersHcal_;

        if (thisEventPasses_)
                ++nEventWrites_;
        else
                ++nEventFails_;

}

std::vector<unsigned> CalibratableTest::findPrimarySimParticles(
                const std::vector<PFSimParticle>& sims) {
        std::vector<unsigned> answers;
        unsigned index(0);
        for (std::vector<PFSimParticle>::const_iterator cit = sims.begin(); cit
                        != sims.end(); ++cit) {
                PFSimParticle theSim = *cit;
                //TODO: what about rejected events?
                if (theSim.motherId() >= 0)
                        continue;
                int particleId = abs(theSim.pdgCode());
                if (particleId != 211)
                        continue;
                //TODO: ...particularly interacting pions?
                if (theSim.daughterIds().size() > 0)
                        continue;
                answers.push_back(index);
                ++index;
        }
        return answers;
}

void CalibratableTest::extractCandidate(const PFCandidate& cand) {
        if (debug_ > 3)
                std::cout << "\tCandidate: "<< cand << "\n";

        //There may be several PFCandiates per sim particle. So we create a mini-class
        //to represent each one. CandidateWrapper is defined in Calibratable.
        //It's very easy to use, as we shall see...
        CandidateWrapper cw;
        cw.energy_ = cand.energy();
        cw.eta_ = cand.eta();
        cw.phi_ = cand.phi();
        cw.type_ = cand.particleId();
        cw.energyEcal_ = cand.ecalEnergy();
        cw.energyHcal_ = cand.hcalEnergy();
        if (debug_ > 4)
                std::cout << "\t\tECAL energy = " << cand.ecalEnergy()
                                << ", HCAL energy = " << cand.hcalEnergy() << "\n";

        //Now, extract block elements from the pfCandidate:
        PFCandidate::ElementsInBlocks eleInBlocks = cand.elementsInBlocks();
        if (debug_ > 3)
                std::cout << "\tLooping over elements in blocks, "
                                << eleInBlocks.size() << " of them."<< std::endl;
        for (PFCandidate::ElementsInBlocks::iterator bit = eleInBlocks.begin(); bit
                        != eleInBlocks.end(); ++bit) {

                /* 
                 * Find PFClusters associated with this candidate.
                 */
                
                //Extract block reference
                PFBlockRef blockRef((*bit).first);
                //Extract index
                unsigned indexInBlock((*bit).second);
                //Dereference the block (what a palava!)
                const PFBlock& block = *blockRef;
                //And finally get a handle on the elements
                const edm::OwnVector<reco::PFBlockElement> & elements = block.elements();
                //get references to the candidate's track, ecal clusters and hcal clusters
                switch (elements[indexInBlock].type()) {
                case PFBlockElement::ECAL: {
                        reco::PFClusterRef clusterRef = elements[indexInBlock].clusterRef();
                        const PFCluster theRealCluster = *clusterRef;
                        CalibratableElement d(theRealCluster.energy(),
                                        theRealCluster.positionREP().eta(), theRealCluster.positionREP().phi(), theRealCluster.layer() );
                        calib_->cluster_ecal_.push_back(d);
                        if (debug_ > 4)
                                std::cout << "\t\tECAL cluster: "<< theRealCluster << "\n";

                        break;
                }

                case PFBlockElement::HCAL: {
                        reco::PFClusterRef clusterRef = elements[indexInBlock].clusterRef();
                        const PFCluster theRealCluster = *clusterRef;
                        CalibratableElement d(theRealCluster.energy(),
                                        theRealCluster.positionREP().eta(), theRealCluster.positionREP().phi(), theRealCluster.layer() );
                        calib_->cluster_hcal_.push_back(d);
                        if (debug_ > 4)
                                std::cout << "\t\tHCAL cluster: "<< theRealCluster << "\n";

                        break;
                }

                default:
                        if (debug_ > 3)
                                std::cout << "\t\tOther block type: "
                                                << elements[indexInBlock].type() << "\n";
                        break;
                }

        }
        //For each candidate found,
        calib_->cands_.push_back(cw);
}

std::vector<unsigned> CalibratableTest::findCandidatesInDeltaR(
                const PFSimParticle& pft, const std::vector<PFCandidate>& cands,
                const double& deltaRCut) {

        unsigned index(0);
        std::vector<unsigned> answers;

        double trEta = pft.trajectoryPoint(PFTrajectoryPoint::ECALEntrance).positionREP().Eta();
        double trPhi = pft.trajectoryPoint(PFTrajectoryPoint::ECALEntrance).positionREP().Phi();

        for (std::vector<PFCandidate>::const_iterator cit = cands.begin(); cit
                        != cands.end(); ++cit) {

                PFCandidate cand = *cit;
                double cEta = cand.eta();
                double cPhi = cand.phi();

                if (deltaR(cEta, trEta, cPhi, trPhi) < deltaRCut) {
                        //accept
                        answers.push_back(index);
                }

                ++index;
        }
        return answers;
}

void CalibratableTest::fillTreeAndReset() {
        if (thisEventPasses_ && thisParticlePasses_) {
                ++nParticleWrites_;
                calib_->recompute();
                if (debug_> 4) {
                        //print a summary
                        std::cout << *calib_;
                }
                tree_->Fill();
        } else {
                ++nParticleFails_;
        }
        if (debug_ > 1)
                std::cout << "\t**Finished particle.**\n";
        calib_->reset();
}

void CalibratableTest::endJob() {

        if (debug_> 0) {
                std::cout << __PRETTY_FUNCTION__ << std::endl;

                std::cout << "\tnParticleWrites: "<< nParticleWrites_
                                << ", nParticleFails: "<< nParticleFails_ << "\n";
                std::cout << "\tnEventWrites: "<< nEventWrites_ << ", nEventFails: "
                                << nEventFails_ << "\n";
                std::cout << "Leaving "<< __PRETTY_FUNCTION__ << "\n";
        }

}

double CalibratableTest::deltaR(const double& eta1, const double& eta2,
                const double& phi1, const double& phi2) {
        double deltaEta = fabs(eta1 - eta2);
        double deltaPhi = fabs(phi1 - phi2);
        if (deltaPhi > M_PI) {
                deltaPhi = 2 * M_PI- deltaPhi;
        }
        return sqrt(pow(deltaEta, 2) + pow(deltaPhi, 2));
}