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// $Id: FillGenParts.cc,v 1.8 2008/06/20 17:52:57 loizides Exp $
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#include "MitProd/TreeFiller/interface/FillGenParts.h"
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#include "FWCore/MessageLogger/interface/MessageLogger.h"
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#include "FWCore/Framework/interface/ESHandle.h"
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#include "FWCore/ServiceRegistry/interface/Service.h"
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#include "DataFormats/Common/interface/Handle.h"
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#include "SimDataFormats/HepMCProduct/interface/HepMCProduct.h"
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#include "MitAna/DataTree/interface/Names.h"
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#include "MitAna/DataTree/interface/GenParticle.h"
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#include "MitProd/TreeService/interface/TreeService.h"
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#include "MitAna/DataUtil/interface/TreeWriter.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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FillGenParts::FillGenParts(const edm::ParameterSet &cfg) :
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genParticles_(new mithep::Array<mithep::GenParticle>()),
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mcSource_(cfg.getUntrackedParameter<string>("source", "source")),
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genPartBrn_(cfg.getUntrackedParameter<string>("brname", Names::gkGenPartBrn))
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{
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}
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//-------------------------------------------------------------------------------------------------
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FillGenParts::~FillGenParts()
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{
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}
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//-------------------------------------------------------------------------------------------------
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void FillGenParts::analyze(const edm::Event &event, const edm::EventSetup &setup)
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{
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genParticles_->Reset();
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Handle<HepMCProduct> theMCProduct;
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try {
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event.getByLabel(mcSource_, theMCProduct);
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} catch (cms::Exception& ex) {
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edm::LogError("FillGenParts") << "Error! Can not get collection with label "
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<< mcSource_ << endl;
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throw edm::Exception(edm::errors::Configuration, "FillGenParts::analyze()\n")
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<< "Error! Can not get collection with label " << mcSource_ << endl;
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}
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const HepMC::GenEvent GenEvent = theMCProduct->getHepMCData();
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int nGen = 0;
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for (HepMC::GenEvent::particle_const_iterator pgen = GenEvent.particles_begin();
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pgen != GenEvent.particles_end(); ++pgen) {
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HepMC::GenParticle* mcPart = (*pgen);
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if(!mcPart) continue;
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Short_t moind = -1;
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HepMC::GenVertex * momVert = mcPart->production_vertex();
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if (momVert) {
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if (momVert->particles_in_size() == 1) {
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HepMC::GenVertex::particles_in_const_iterator mom =
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momVert->particles_in_const_begin();
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moind = (*mom)->barcode() - 1;
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}
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}
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mithep::GenParticle genParticle(mcPart->momentum().x(),mcPart->momentum().y(),
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mcPart->momentum().z(),mcPart->momentum().e(),
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mcPart->pdg_id(),
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mcPart->status(),
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moind);
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genParticles_->AddCopy(genParticle);
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nGen++;
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}
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genParticles_->Trim();
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}
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//-------------------------------------------------------------------------------------------------
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void FillGenParts::beginJob(const edm::EventSetup &event)
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{
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Service<TreeService> ts;
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TreeWriter *tws = ts->get();
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if(!tws) {
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throw edm::Exception(edm::errors::Configuration, "FillGenParts::beginJob()\n")
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<< "Could not get pointer to Tree with name " << tws->GetName() << "\n";
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return;
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}
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tws->AddBranch(genPartBrn_.c_str(), &genParticles_);
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}
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//-------------------------------------------------------------------------------------------------
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void FillGenParts::endJob()
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{
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edm::LogInfo("FillGenParts::endJob") << "Ending Job" << endl;
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}
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