/data/refman/pasoursint/CMSSW_6_1_2_SLHC2/src/RecoMuon/MuonIdentification/plugins/MuonLinksProducerForHLT.cc

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// system include files
#include <memory>

// user include files
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/EDProducer.h"

#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/EventSetup.h"

#include "FWCore/ParameterSet/interface/ParameterSet.h"

#include "DataFormats/Common/interface/Handle.h"
#include "DataFormats/TrackReco/interface/TrackFwd.h"
#include "DataFormats/TrackReco/interface/Track.h"
#include "DataFormats/MuonReco/interface/MuonFwd.h"
//#include "DataFormats/MuonReco/interface/Muon.h"
#include "DataFormats/MuonReco/interface/MuonTrackLinks.h"
#include "RecoMuon/MuonIdentification/plugins/MuonLinksProducerForHLT.h"

//#include <algorithm>

MuonLinksProducerForHLT::MuonLinksProducerForHLT(const edm::ParameterSet& iConfig)
{
   produces<reco::MuonTrackLinksCollection>();
   theLinkCollectionInInput = iConfig.getParameter<edm::InputTag>("LinkCollection");
   theInclusiveTrackCollectionInInput = iConfig.getParameter<edm::InputTag>("InclusiveTrackerTrackCollection");
   ptMin = iConfig.getParameter<double>("ptMin");
   pMin = iConfig.getParameter<double>("pMin");
   shareHitFraction = iConfig.getParameter<double>("shareHitFraction");
}

MuonLinksProducerForHLT::~MuonLinksProducerForHLT()
{
}

void MuonLinksProducerForHLT::produce(edm::Event& iEvent, const edm::EventSetup& iSetup)
{
   std::auto_ptr<reco::MuonTrackLinksCollection> output(new reco::MuonTrackLinksCollection());

   edm::Handle<reco::MuonTrackLinksCollection> links; 
   iEvent.getByLabel(theLinkCollectionInInput, links);

   edm::Handle<reco::TrackCollection> incTracks; 
   iEvent.getByLabel(theInclusiveTrackCollectionInInput, incTracks);

   for(reco::MuonTrackLinksCollection::const_iterator link = links->begin(); 
       link != links->end(); ++link){
     bool found = false;
     unsigned int trackIndex = 0;
     unsigned int muonTrackHits = link->trackerTrack()->extra()->recHits().size();
     for(reco::TrackCollection::const_iterator track = incTracks->begin();
         track != incTracks->end(); ++track, ++trackIndex){      
       if ( track->pt() < ptMin ) continue;
       if ( track->p() < pMin ) continue;
       //std::cout << "pt (muon/track) " << link->trackerTrack()->pt() << " " << track->pt() << std::endl;
       unsigned trackHits = track->extra()->recHits().size();
       //std::cout << "hits (muon/track) " << muonTrackHits  << " " << trackHits() << std::endl;
       unsigned int smallestNumberOfHits = trackHits < muonTrackHits ? trackHits : muonTrackHits;
       int numberOfCommonDetIds = 0;
       for ( TrackingRecHitRefVector::const_iterator hit = track->extra()->recHitsBegin();
             hit != track->extra()->recHitsEnd(); ++hit ) {
         for ( TrackingRecHitRefVector::const_iterator mit = link->trackerTrack()->extra()->recHitsBegin();
             mit != link->trackerTrack()->extra()->recHitsEnd(); ++mit ) {
           if ( hit->get()->geographicalId() == mit->get()->geographicalId() && 
                hit->get()->sharesInput(mit->get(),TrackingRecHit::some) ) { 
             numberOfCommonDetIds++;
             break;
           }
         }
       }
       double fraction = (double)numberOfCommonDetIds/smallestNumberOfHits;
       // std::cout << "Overlap/Smallest/fraction = " << numberOfCommonDetIds << " " << smallestNumberOfHits << " " << fraction << std::endl;
       if( fraction > shareHitFraction ) { 
         output->push_back(reco::MuonTrackLinks(reco::TrackRef(incTracks,trackIndex), 
                                                link->standAloneTrack(), 
                                                link->globalTrack() ) );
         found = true;
         break;
       }
     }
     if (!found) 
       output->push_back(reco::MuonTrackLinks(link->trackerTrack(), 
                                              link->standAloneTrack(), 
                                              link->globalTrack() ) );
   }  
   iEvent.put( output );
}