MuonDetCleaner.h

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#include "FWCore/Framework/interface/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "DataFormats/Common/interface/Handle.h"

#include "DataFormats/Common/interface/RangeMap.h"
#include "DataFormats/Common/interface/OwnVector.h"

#include "DataFormats/PatCandidates/interface/Muon.h"

#include <string>
#include <vector>
#include <map>

template <typename T1, typename T2>
class MuonDetCleaner : public edm::EDProducer 
{
 public:
  explicit MuonDetCleaner(const edm::ParameterSet&);
  ~MuonDetCleaner();

 private:
  virtual void produce(edm::Event&, const edm::EventSetup&);

  typedef edm::RangeMap<T1, edm::OwnVector<T2> > RecHitCollection;
  void fillVetoHits(const TrackingRecHit& , std::vector<uint32_t>* );
  
  uint32_t getRawDetId(const T2&);
  bool checkrecHit(const TrackingRecHit&); 

  const edm::EDGetTokenT<edm::View<pat::Muon> > mu_input_;
  
  std::map<std::string,  edm::EDGetTokenT<RecHitCollection > > inputs_;
  
};

template <typename T1, typename T2>
MuonDetCleaner<T1,T2>::MuonDetCleaner(const edm::ParameterSet& iConfig):
    mu_input_(consumes<edm::View<pat::Muon> >(iConfig.getParameter<edm::InputTag>("MuonCollection"))) 
{
  std::vector<edm::InputTag> inCollections =  iConfig.getParameter<std::vector<edm::InputTag> >("oldCollection");
  for (auto inCollection : inCollections){
     inputs_[inCollection.instance()] = consumes<RecHitCollection >(inCollection);
     produces<RecHitCollection>(inCollection.instance());
  }
    
}

template <typename T1, typename T2>
MuonDetCleaner<T1,T2>::~MuonDetCleaner()
{
// nothing to be done yet...  
}

template <typename T1, typename T2>
void MuonDetCleaner<T1,T2>::produce(edm::Event& iEvent, const edm::EventSetup& es)
{
   std::map<T1, std::vector<T2> > recHits_output; // This data format is easyer to handle
   std::vector<uint32_t> vetoHits;
  
  // First fill the veto RecHits colletion with the Hits from the input muons
   edm::Handle< edm::View<pat::Muon> > muonHandle;
   iEvent.getByToken(mu_input_, muonHandle);
   edm::View<pat::Muon> muons = *muonHandle;
   for (edm::View<pat::Muon>::const_iterator iMuon = muons.begin(); iMuon != muons.end(); ++iMuon) {     
      const reco::Track* track = 0;
      if( iMuon->isGlobalMuon() ) track = iMuon->outerTrack().get();
      else if  ( iMuon->isStandAloneMuon() ) track =   iMuon->outerTrack().get();
      else if  ( iMuon->isRPCMuon() ) track =   iMuon->innerTrack().get(); // To add, try to access the rpc track 
      else if  ( iMuon->isTrackerMuon() ) track = iMuon->innerTrack().get();
      else {
    std::cout<<"The imput muon: "<<(*iMuon)<<" must be either global or does or be tracker muon"<<std::endl; //todo fill this tho cmssw error logger
    assert(0);
      }
      
      
     for (trackingRecHit_iterator hitIt = track->recHitsBegin(); hitIt != track->recHitsEnd(); ++hitIt) {
        const TrackingRecHit &murechit = **hitIt; // Base class for all rechits 
        if(!(murechit).isValid()) continue;
        if (!checkrecHit(murechit)) continue;   // Check if the hit belongs to a specifc detector section   
        fillVetoHits(murechit,&vetoHits); // Go back to the very basic rechits 
       }
   }

   
   // Now this can also handle different instance
   for (auto input_ : inputs_){
    // Second read in the RecHit Colltection which is to be replaced, without the vetoRecHits   
    typedef edm::Handle<RecHitCollection> RecHitCollectionHandle;
    RecHitCollectionHandle RecHitinput;
    iEvent.getByToken(input_.second, RecHitinput);
    for ( typename RecHitCollection::const_iterator recHit = RecHitinput->begin(); recHit != RecHitinput->end(); ++recHit ) { // loop over the basic rec hit collection (DT CSC or RPC)
    //if (find(vetoHits.begin(),vetoHits.end(),getRawDetId(*recHit)) == vetoHits.end()) continue; // For the invertec selcetion
        if (find(vetoHits.begin(),vetoHits.end(),getRawDetId(*recHit)) != vetoHits.end()) continue; // If the hit is not in the  
    T1 detId(getRawDetId(*recHit));
    recHits_output[detId].push_back(*recHit);   
    }
  
    
    
    // Last step savet the output in the CMSSW Data Format
    std::unique_ptr<RecHitCollection> output(new RecHitCollection());
    for ( typename std::map<T1, std::vector<T2> >::const_iterator recHit = recHits_output.begin(); recHit != recHits_output.end(); ++recHit ) {
      output->put(recHit->first, recHit->second.begin(), recHit->second.end());
    }
    output->post_insert();
    iEvent.put(std::move(output),input_.first);
   }
}


template <typename T1, typename T2>
void MuonDetCleaner<T1,T2>::fillVetoHits(const TrackingRecHit& rh, std::vector<uint32_t>* HitsList)
{
    std::vector<const TrackingRecHit*> rh_components = rh.recHits();
    if ( rh_components.size() == 0 ) {
      HitsList->push_back(rh.rawId());
    } 
    else {
      for ( std::vector<const TrackingRecHit*>::const_iterator rh_component = rh_components.begin(); rh_component != rh_components.end(); ++rh_component ) {
    fillVetoHits(**rh_component, HitsList);
      }
    }
}