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// $Id: FillerAODMCParticles.cc,v 1.1 2009/02/23 20:53:35 bendavid Exp $
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#include "MitProd/TreeFiller/interface/FillerAODMCParticles.h"
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#include "FWCore/MessageLogger/interface/MessageLogger.h"
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#include "DataFormats/Common/interface/Handle.h"
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#include "DataFormats/Common/interface/RefToPtr.h"
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#include "DataFormats/HepMCCandidate/interface/GenParticleFwd.h"
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#include "DataFormats/HepMCCandidate/interface/GenParticle.h"
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#include "MitAna/DataTree/interface/Names.h"
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using namespace std;
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using namespace edm;
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using namespace mithep;
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//--------------------------------------------------------------------------------------------------
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FillerAODMCParticles::FillerAODMCParticles(const ParameterSet &cfg, const char *name, bool active) :
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BaseFiller(cfg, name, active),
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genEdmName_(Conf().getUntrackedParameter<string>("genEdmName","genParticles")),
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genMapName_(Conf().getUntrackedParameter<string>("genMapName","AODGenMap")),
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mitName_(Conf().getUntrackedParameter<string>("mitName",Names::gkMCPartBrn)),
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mcParticles_(new mithep::MCParticleArr(250)),
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genMap_(new mithep::AODGenParticleMap)
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{
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// Constructor.
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}
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//--------------------------------------------------------------------------------------------------
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FillerAODMCParticles::~FillerAODMCParticles()
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{
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// Destructor.
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delete mcParticles_;
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delete genMap_;
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}
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//--------------------------------------------------------------------------------------------------
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void FillerAODMCParticles::BookDataBlock(TreeWriter &tws)
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{
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// Add branch to tree and publish our maps.
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tws.AddBranch(mitName_.c_str(),&mcParticles_);
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OS()->add(genMap_,genMapName_.c_str());
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}
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//--------------------------------------------------------------------------------------------------
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void FillerAODMCParticles::FillDataBlock(const edm::Event &event,
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const edm::EventSetup &setup)
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{
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// Loop over HepMC particle and fill their information.
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mcParticles_->Delete();
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genMap_->Reset();
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Handle<reco::GenParticleCollection> hGenPProduct;
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GetProduct(genEdmName_, hGenPProduct, event);
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const reco::GenParticleCollection genParticles = *(hGenPProduct.product());
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//loop over all genparticles and copy their information
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for (reco::GenParticleCollection::const_iterator pgen = genParticles.begin();
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pgen != genParticles.end(); ++pgen) {
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mithep::MCParticle *mcPart = mcParticles_->Allocate();
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new (mcPart) mithep::MCParticle(pgen->px(),pgen->py(),
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pgen->pz(),pgen->energy(),
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pgen->pdgId(),
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pgen->status());
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mcPart->SetIsGenerated();
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edm::Ptr<reco::GenParticle> thePtr(hGenPProduct, pgen - genParticles.begin());
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genMap_->Add(thePtr, mcPart);
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}
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mcParticles_->Trim();
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}
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//--------------------------------------------------------------------------------------------------
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void FillerAODMCParticles::ResolveLinks(const edm::Event &event,
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const edm::EventSetup &setup)
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{
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// Loop over HepMC particle and resolve their links.
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Handle<reco::GenParticleCollection> hGenPProduct;
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GetProduct(genEdmName_, hGenPProduct, event);
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const reco::GenParticleCollection genParticles = *(hGenPProduct.product());
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//loop over all genparticles and copy their information
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for (reco::GenParticleCollection::const_iterator pgen = genParticles.begin();
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pgen != genParticles.end(); ++pgen) {
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int nDaughters = pgen->numberOfDaughters();
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if (nDaughters>0) {
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edm::Ptr<reco::GenParticle> thePtr(hGenPProduct, pgen - genParticles.begin());
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MCParticle *mcMother = genMap_->GetMit(thePtr);
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for (int i=0; i<nDaughters; ++i) {
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const reco::Candidate *genDaughter = pgen->daughter(i);
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MCParticle *mcDaughter = genMap_->GetMit(refToPtr(pgen->daughterRef(i)));
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//set mother decay vertex
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if (i==0)
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mcMother->SetVertex(genDaughter->vx(),genDaughter->vy(),genDaughter->vz());
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//set mother-daughter links
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mcMother->AddDaughter(mcDaughter);
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if (!mcDaughter->HasMother())
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mcDaughter->SetMother(mcMother);
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}
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}
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}
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}
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