FastTrackerRecHitCombiner.cc

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// system include files
#include <memory>

// frame work stuff
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/stream/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/StreamID.h"

// specific for this producer
#include "SimDataFormats/TrackingHit/interface/PSimHitContainer.h"
#include "SimDataFormats/Track/interface/SimTrackContainer.h"
#include "DataFormats/TrackerRecHit2D/interface/FastTrackerRecHitCollection.h"

class FastTrackerRecHitCombiner : public edm::stream::EDProducer<> {
    public:

    explicit FastTrackerRecHitCombiner(const edm::ParameterSet&);
    ~FastTrackerRecHitCombiner(){;}

    static void fillDescriptions(edm::ConfigurationDescriptions& descriptions);

    private:

    virtual void beginStream(edm::StreamID) override{;}
    virtual void produce(edm::Event&, const edm::EventSetup&) override;
    virtual void endStream() override{;}

    // ----------member data ---------------------------
    edm::EDGetTokenT<edm::PSimHitContainer> simHitsToken; 
    edm::EDGetTokenT<FastTrackerRecHitRefCollection> simHit2RecHitMapToken;
    unsigned int minNHits;
};


FastTrackerRecHitCombiner::FastTrackerRecHitCombiner(const edm::ParameterSet& iConfig)
    : simHitsToken(consumes<edm::PSimHitContainer>(iConfig.getParameter<edm::InputTag>("simHits")))
    , simHit2RecHitMapToken(consumes<FastTrackerRecHitRefCollection>(iConfig.getParameter<edm::InputTag>("simHit2RecHitMap")))
    , minNHits(iConfig.getParameter<unsigned int>("minNHits"))
{
    produces<FastTrackerRecHitCombinationCollection>();
}


void
    FastTrackerRecHitCombiner::produce(edm::Event& iEvent, const edm::EventSetup& iSetup)
{

    // input
    edm::Handle<edm::PSimHitContainer> simHits;
    iEvent.getByToken(simHitsToken,simHits);

    edm::Handle<FastTrackerRecHitRefCollection> simHit2RecHitMap;
    iEvent.getByToken(simHit2RecHitMapToken,simHit2RecHitMap);
 
    // output
    std::unique_ptr<FastTrackerRecHitCombinationCollection> output(new FastTrackerRecHitCombinationCollection);
    
    FastTrackerRecHitCombination currentCombination;
    for(unsigned int simHitCounter = 0;simHitCounter < simHits->size();simHitCounter++){
    
    // get simHit and recHit
    const PSimHit & simHit = (*simHits)[simHitCounter];
    const FastTrackerRecHitRef & recHit = (*simHit2RecHitMap)[simHitCounter];

    // add recHit to latest combination
    if(!recHit.isNull())
        currentCombination.push_back(recHit);

    // if simTrackId is about to change, add combination
    if(simHits->size()-simHitCounter == 1 || simHit.trackId() != (*simHits)[simHitCounter+1].trackId() ){
        // combination must have sufficient hits
        if(currentCombination.size() >= minNHits){
        currentCombination.shrink_to_fit();
        output->push_back(currentCombination);
        }
        currentCombination.clear();
    }
    }

    // put output in event
    iEvent.put(std::move(output));
}
    

 
// ------------ method fills 'descriptions' with the allowed parameters for the module  ------------
void FastTrackerRecHitCombiner::fillDescriptions(edm::ConfigurationDescriptions& descriptions) {
    //The following says we do not know what parameters are allowed so do no validation
    // Please change this to state exactly what you do use, even if it is no parameters
    edm::ParameterSetDescription desc;
    desc.setUnknown();
    descriptions.addDefault(desc);
}

//define this as a plug-in
DEFINE_FWK_MODULE(FastTrackerRecHitCombiner);