ME0SegmentBuilder.cc

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#include "RecoLocalMuon/GEMSegment/plugins/ME0SegmentBuilder.h"
#include "DataFormats/MuonDetId/interface/ME0DetId.h"
#include "DataFormats/GEMRecHit/interface/ME0RecHit.h"
#include "Geometry/GEMGeometry/interface/ME0Geometry.h"
#include "Geometry/GEMGeometry/interface/ME0EtaPartition.h"
#include "Geometry/GEMGeometry/interface/ME0Chamber.h"
#include "RecoLocalMuon/GEMSegment/plugins/ME0SegmentAlgorithmBase.h"
#include "RecoLocalMuon/GEMSegment/plugins/ME0SegmentBuilderPluginFactory.h"

#include "FWCore/Utilities/interface/Exception.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"

ME0SegmentBuilder::ME0SegmentBuilder(const edm::ParameterSet& ps) : geom_(nullptr) {

  // Algo type (indexed)
  int chosenAlgo = ps.getParameter<int>("algo_type") - 1;
  // Find appropriate ParameterSets for each algo type

  std::vector<edm::ParameterSet> algoPSets = ps.getParameter<std::vector<edm::ParameterSet> >("algo_psets");

  edm::ParameterSet segAlgoPSet = algoPSets[chosenAlgo].getParameter<edm::ParameterSet>("algo_pset");
  std::string algoName = algoPSets[chosenAlgo].getParameter<std::string>("algo_name");
  LogDebug("ME0SegmentBuilder")<< "ME0SegmentBuilder algorithm name: " << algoName;

  // Ask factory to build this algorithm, giving it appropriate ParameterSet
  algo = std::unique_ptr<ME0SegmentAlgorithmBase>(ME0SegmentBuilderPluginFactory::get()->create(algoName, segAlgoPSet));
}

ME0SegmentBuilder::~ME0SegmentBuilder() {}

void ME0SegmentBuilder::build(const ME0RecHitCollection* recHits, ME0SegmentCollection& oc) {

  LogDebug("ME0SegmentBuilder")<< "Total number of rechits in this event: " << recHits->size();


  std::map<ME0DetId, bool> foundChambers;
  for(ME0RecHitCollection::const_iterator it = recHits->begin(); it != recHits->end(); it++) {
      const auto chId = it->me0Id().chamberId();
      auto chIt = foundChambers.find(chId);
      if(chIt !=  foundChambers.end()) continue;
      foundChambers[chId] = true;
      ME0SegmentAlgorithmBase::HitAndPositionContainer hitAndPositions;
      const ME0Chamber* chamber = geom_->chamber(chId);
      for(ME0RecHitCollection::const_iterator it2 = it; it2 != recHits->end(); it2++) {
          if(it2->me0Id().chamberId() != chId) continue;

          const auto*  part = geom_->etaPartition(it2->me0Id());
          GlobalPoint glb = part->toGlobal(it2->localPosition());
          LocalPoint nLoc = chamber->toLocal(glb);
          hitAndPositions.emplace_back(&(*it2),nLoc,glb,hitAndPositions.size());
      }

      LogDebug("ME0Segment|ME0") << "found " << hitAndPositions.size() << " rechits in chamber " << chId;
      //sort by layer
        auto getLayer =[&](int iL) ->const ME0Layer* { //function is broken in the geo currently
          for (auto layer : chamber->layers()){
              if (layer->id().layer()==iL)
                  return layer;
          }
          return nullptr;
        };
        float z1 = getLayer(1)->position().z();
        float z6 = getLayer(6)->position().z();
        if(z1 < z6)
            std::sort(hitAndPositions.begin(), hitAndPositions.end(), [](const ME0SegmentAlgorithmBase::HitAndPosition& h1,const ME0SegmentAlgorithmBase::HitAndPosition& h2 ) {return h1.layer < h2.layer;});
        else
            std::sort(hitAndPositions.begin(), hitAndPositions.end(), [](const ME0SegmentAlgorithmBase::HitAndPosition& h1,const ME0SegmentAlgorithmBase::HitAndPosition& h2 ) {return h1.layer > h2.layer;} );

      // given the chamber select the appropriate algo... and run it
      std::vector<ME0Segment> segv = algo->run(chamber, hitAndPositions);

      LogDebug("ME0Segment|ME0") << "found " << segv.size() << " segments in chamber " << chId;

      // Add the segments to master collection
      if(!segv.empty())
      oc.put(chId, segv.begin(), segv.end());

  }
}

void ME0SegmentBuilder::setGeometry(const ME0Geometry* geom) {
  geom_ = geom;
}