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File indexing completed on 2021-02-14 14:21:07

0001 
0002 /*
0003 */
0004 
0005 #include "IOMC/EventVertexGenerators/interface/BaseEvtVtxGenerator.h"
0006 
0007 #include "FWCore/Framework/interface/Event.h"
0008 #include "FWCore/ParameterSet/interface/ParameterSet.h"
0009 
0010 #include "SimDataFormats/GeneratorProducts/interface/HepMCProduct.h"
0011 #include "SimDataFormats/GeneratorProducts/interface/HepMCProduct.h"
0012 
0013 #include "FWCore/ServiceRegistry/interface/Service.h"
0014 #include "FWCore/Utilities/interface/RandomNumberGenerator.h"
0015 
0016 #include "FWCore/Utilities/interface/Exception.h"
0017 
0018 #include "DataFormats/Provenance/interface/Provenance.h"
0019 #include "FWCore/Utilities/interface/EDMException.h"
0020 
0021 //#include "HepMC/GenEvent.h"
0022 // #include "CLHEP/Vector/ThreeVector.h"
0023 // #include "HepMC/SimpleVector.h"
0024 
0025 using namespace edm;
0026 using namespace CLHEP;
0027 //using namespace HepMC;
0028 
0029 BaseEvtVtxGenerator::BaseEvtVtxGenerator(const ParameterSet& pset) {
0030   Service<RandomNumberGenerator> rng;
0031   if (!rng.isAvailable()) {
0032     throw cms::Exception("Configuration") << "The BaseEvtVtxGenerator requires the RandomNumberGeneratorService\n"
0033                                              "which is not present in the configuration file. \n"
0034                                              "You must add the service\n"
0035                                              "in the configuration file or remove the modules that require it.";
0036   }
0037 
0038   sourceToken = consumes<edm::HepMCProduct>(pset.getParameter<edm::InputTag>("src"));
0039   produces<edm::HepMCProduct>();
0040 }
0041 
0042 BaseEvtVtxGenerator::~BaseEvtVtxGenerator() {}
0043 
0044 void BaseEvtVtxGenerator::produce(Event& evt, const EventSetup&) {
0045   edm::Service<edm::RandomNumberGenerator> rng;
0046   CLHEP::HepRandomEngine* engine = &rng->getEngine(evt.streamID());
0047 
0048   Handle<HepMCProduct> HepUnsmearedMCEvt;
0049 
0050   evt.getByToken(sourceToken, HepUnsmearedMCEvt);
0051 
0052   // Copy the HepMC::GenEvent
0053   HepMC::GenEvent* genevt = new HepMC::GenEvent(*HepUnsmearedMCEvt->GetEvent());
0054   std::unique_ptr<edm::HepMCProduct> HepMCEvt(new edm::HepMCProduct(genevt));
0055   // generate new vertex & apply the shift
0056   //
0057   HepMCEvt->applyVtxGen(newVertex(engine));
0058 
0059   //HepMCEvt->LorentzBoost( 0., 142.e-6 );
0060   HepMCEvt->boostToLab(GetInvLorentzBoost(), "vertex");
0061   HepMCEvt->boostToLab(GetInvLorentzBoost(), "momentum");
0062 
0063   evt.put(std::move(HepMCEvt));
0064 
0065   return;
0066 }