GsfMaterialEffectsESProducer.cc

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#include "FWCore/Framework/interface/ESProducer.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/Framework/interface/ModuleFactory.h"
 
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/ParameterSet/interface/EmptyGroupDescription.h"
 
#include "TrackingTools/Records/interface/TrackingComponentsRecord.h"
#include "TrackingTools/GsfTracking/interface/GsfMaterialEffectsUpdator.h"
 
#include "TrackingTools/MaterialEffects/interface/MultipleScatteringUpdator.h"
#include "TrackingTools/MaterialEffects/interface/EnergyLossUpdator.h"
#include "TrackingTools/GsfTracking/interface/GsfMaterialEffectsAdapter.h"
#include "TrackingTools/GsfTracking/interface/GsfMultipleScatteringUpdator.h"
#include "TrackingTools/GsfTracking/interface/GsfBetheHeitlerUpdator.h"
#include "TrackingTools/GsfTracking/interface/GsfCombinedMaterialEffectsUpdator.h"
 
#include <string>
#include <memory>
#include <optional>
 
class GsfMaterialEffectsESProducer : public edm::ESProducer {
public:
  GsfMaterialEffectsESProducer(const edm::ParameterSet& p);
 
  std::unique_ptr<GsfMaterialEffectsUpdator> produce(const TrackingComponentsRecord&);
 
  static void fillDescriptions(edm::ConfigurationDescriptions& descriptions);
 
private:
  struct BetheHeitlerInit {
    BetheHeitlerInit(std::string iName, int iCorrection) : fileName(std::move(iName)), correction(iCorrection) {}
    std::string fileName;
    int correction;
  };
 
  std::optional<BetheHeitlerInit> doInit(const edm::ParameterSet& p) {
    if (p.getParameter<std::string>("EnergyLossUpdator") != "GsfBetheHeitlerUpdator") {
      return std::optional<BetheHeitlerInit>();
    }
    return std::make_optional<BetheHeitlerInit>(p.getParameter<std::string>("BetheHeitlerParametrization"),
                                                p.getParameter<int>("BetheHeitlerCorrection"));
  }
 
  std::optional<BetheHeitlerInit> betheHeitlerInit_;
  const double mass_;
  const bool useMultipleScattering_;
};
 
using namespace edm;
 
GsfMaterialEffectsESProducer::GsfMaterialEffectsESProducer(const edm::ParameterSet& p)
    : betheHeitlerInit_(doInit(p)),
      mass_(p.getParameter<double>("Mass")),
      useMultipleScattering_(p.getParameter<std::string>("MultipleScatteringUpdator") == "GsfMultipleScatteringUpdator")
 
{
  std::string myname = p.getParameter<std::string>("ComponentName");
  setWhatProduced(this, myname);
}
 
std::unique_ptr<GsfMaterialEffectsUpdator> GsfMaterialEffectsESProducer::produce(
    const TrackingComponentsRecord& iRecord) {
  std::unique_ptr<GsfMaterialEffectsUpdator> msUpdator;
  if (useMultipleScattering_) {
    msUpdator.reset(new GsfMultipleScatteringUpdator(mass_));
  } else {
    msUpdator.reset(new GsfMaterialEffectsAdapter(MultipleScatteringUpdator(mass_)));
  }
 
  std::unique_ptr<GsfMaterialEffectsUpdator> elUpdator;
  if (betheHeitlerInit_) {
    elUpdator.reset(new GsfBetheHeitlerUpdator(betheHeitlerInit_->fileName, betheHeitlerInit_->correction));
  } else {
    elUpdator.reset(new GsfMaterialEffectsAdapter(EnergyLossUpdator(mass_)));
  }
 
  auto updator = std::make_unique<GsfCombinedMaterialEffectsUpdator>(*msUpdator, *elUpdator);
 
  return updator;
}
 
void GsfMaterialEffectsESProducer::fillDescriptions(edm::ConfigurationDescriptions& descriptions) {
  edm::ParameterSetDescription desc;
 
  desc.add<std::string>("ComponentName");
  desc.add<double>("Mass");
  desc.add<std::string>("MultipleScatteringUpdator");
  //Depending on the value of "EnergyLossUpdator", different parameters are allowed
  desc.ifValue(
      edm::ParameterDescription<std::string>("EnergyLossUpdator", "GsfBetheHeitlerUpdator", true),
      "GsfBetheHeitlerUpdator" >> (edm::ParameterDescription<std::string>("BetheHeitlerParametrization", true) and
                                   edm::ParameterDescription<int>("BetheHeitlerCorrection", true)) or
          "EnergyLossUpdator" >> edm::EmptyGroupDescription()  //No additional parameters needed
  );
  descriptions.addDefault(desc);
}
 
DEFINE_FWK_EVENTSETUP_MODULE(GsfMaterialEffectsESProducer);