TotemRPLocalTrackFitter.cc

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/****************************************************************************
*
* This is a part of TOTEM offline software.
* Authors:
*   Hubert Niewiadomski
*   Jan Kašpar (jan.kaspar@gmail.com)
*
****************************************************************************/
 
#include "FWCore/Framework/interface/MakerMacros.h"
 
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Framework/interface/stream/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/Framework/interface/ESWatcher.h"
#include "FWCore/Utilities/interface/ESGetToken.h"
 
#include "DataFormats/Common/interface/DetSetVector.h"
#include "DataFormats/CTPPSReco/interface/TotemRPRecHit.h"
#include "DataFormats/CTPPSReco/interface/TotemRPUVPattern.h"
#include "DataFormats/CTPPSReco/interface/TotemRPLocalTrack.h"
 
#include "Geometry/Records/interface/VeryForwardRealGeometryRecord.h"
#include "Geometry/VeryForwardGeometryBuilder/interface/CTPPSGeometry.h"
 
#include "RecoPPS/Local/interface/TotemRPLocalTrackFitterAlgorithm.h"
 
//----------------------------------------------------------------------------------------------------
 
class TotemRPLocalTrackFitter : public edm::stream::EDProducer<> {
public:
  explicit TotemRPLocalTrackFitter(const edm::ParameterSet &conf);
 
  ~TotemRPLocalTrackFitter() override {}
 
  void produce(edm::Event &e, const edm::EventSetup &c) override;
  static void fillDescriptions(edm::ConfigurationDescriptions &);
 
private:
  int verbosity_;
 
  edm::InputTag tagUVPattern;
 
  edm::EDGetTokenT<edm::DetSetVector<TotemRPUVPattern>> patternCollectionToken;
  edm::ESGetToken<CTPPSGeometry, VeryForwardRealGeometryRecord> geometryToken;
 
  edm::ESWatcher<VeryForwardRealGeometryRecord> geometryWatcher;
 
  TotemRPLocalTrackFitterAlgorithm fitter_;
};
 
//----------------------------------------------------------------------------------------------------
//----------------------------------------------------------------------------------------------------
 
using namespace std;
using namespace edm;
 
//----------------------------------------------------------------------------------------------------
 
TotemRPLocalTrackFitter::TotemRPLocalTrackFitter(const edm::ParameterSet &conf)
    : verbosity_(conf.getParameter<int>("verbosity")), fitter_(conf) {
  tagUVPattern = conf.getParameter<edm::InputTag>("tagUVPattern");
  patternCollectionToken = consumes<DetSetVector<TotemRPUVPattern>>(tagUVPattern);
  geometryToken = esConsumes<CTPPSGeometry, VeryForwardRealGeometryRecord>();
 
  produces<DetSetVector<TotemRPLocalTrack>>();
}
 
//----------------------------------------------------------------------------------------------------
 
void TotemRPLocalTrackFitter::produce(edm::Event &e, const edm::EventSetup &setup) {
  if (verbosity_ > 5)
    LogVerbatim("TotemRPLocalTrackFitter") << ">> TotemRPLocalTrackFitter::produce";
 
  // get geometry
  edm::ESHandle<CTPPSGeometry> geometry = setup.getHandle(geometryToken);
 
  if (geometryWatcher.check(setup))
    fitter_.reset();
 
  // get input
  edm::Handle<DetSetVector<TotemRPUVPattern>> input;
  e.getByToken(patternCollectionToken, input);
 
  // run fit for each RP
  DetSetVector<TotemRPLocalTrack> output;
 
  for (const auto &rpv : *input) {
    CTPPSDetId rpId(rpv.detId());
 
    // is U-V association unique?
    unsigned int n_U = 0, n_V = 0;
    unsigned int idx_U = 0, idx_V = 0;
    for (unsigned int pi = 0; pi < rpv.size(); pi++) {
      const TotemRPUVPattern &pattern = rpv[pi];
 
      // here it would make sense to skip non-fittable patterns, but to keep the logic
      // equivalent to version 7_0_4, nothing is skipped
      /*
      if (pattern.fittable() == false)
        continue;
      */
 
      switch (pattern.projection()) {
        case TotemRPUVPattern::projU:
          n_U++;
          idx_U = pi;
          break;
 
        case TotemRPUVPattern::projV:
          n_V++;
          idx_V = pi;
          break;
 
        default:
          break;
      }
    }
 
    if (n_U != 1 || n_V != 1) {
      if (verbosity_)
        LogVerbatim("TotemRPLocalTrackFitter")
            << ">> TotemRPLocalTrackFitter::produce > Impossible to combine U and V patterns in RP " << rpId
            << " (n_U=" << n_U << ", n_V=" << n_V << ").";
 
      continue;
    }
 
    // again, to follow the logic from version 7_0_4, skip the non-fittable patterns here
    if (!rpv[idx_U].fittable() || !rpv[idx_V].fittable())
      continue;
 
    // combine U and V hits
    DetSetVector<TotemRPRecHit> hits;
    for (auto &ids : rpv[idx_U].hits()) {
      auto &ods = hits.find_or_insert(ids.detId());
      for (auto &h : ids)
        ods.push_back(h);
    }
 
    for (auto &ids : rpv[idx_V].hits()) {
      auto &ods = hits.find_or_insert(ids.detId());
      for (auto &h : ids)
        ods.push_back(h);
    }
 
    // run fit
    double z0 = geometry->rpTranslation(rpId).z();
 
    TotemRPLocalTrack track;
    fitter_.fitTrack(hits, z0, *geometry, track);
 
    DetSet<TotemRPLocalTrack> &ds = output.find_or_insert(rpId);
    ds.push_back(track);
 
    if (verbosity_ > 5) {
      unsigned int n_hits = 0;
      for (auto &hds : track.hits())
        n_hits += hds.size();
 
      LogVerbatim("TotemRPLocalTrackFitter")
          << "    track in RP " << rpId << ": valid = " << track.isValid() << ", hits = " << n_hits;
    }
  }
 
  // save results
  e.put(make_unique<DetSetVector<TotemRPLocalTrack>>(output));
}
 
//----------------------------------------------------------------------------------------------------
 
void TotemRPLocalTrackFitter::fillDescriptions(edm::ConfigurationDescriptions &descr) {
  edm::ParameterSetDescription desc;
 
  desc.add<edm::InputTag>("tagUVPattern", edm::InputTag("totemRPUVPatternFinder"))
      ->setComment("input U-V patterns collection to retrieve");
  desc.add<int>("verbosity", 0);
 
  descr.add("totemRPLocalTrackFitter", desc);
}
 
//----------------------------------------------------------------------------------------------------
 
DEFINE_FWK_MODULE(TotemRPLocalTrackFitter);