/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_13_patch3/src/RecoMuon/TrackerSeedGenerator/src/RedundantSeedCleaner.cc

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#include "RecoMuon/TrackerSeedGenerator/interface/RedundantSeedCleaner.h"

//-------------------------------
// Collaborating Class Headers --
//-------------------------------

#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "TrackingTools/TransientTrackingRecHit/interface/TransientTrackingRecHit.h"
#include "DataFormats/TrackingRecHit/interface/TrackingRecHit.h"
#include "DataFormats/TrackerRecHit2D/interface/SiPixelRecHit.h"
#include "DataFormats/TrajectorySeed/interface/TrajectorySeedCollection.h"
#include "DataFormats/MuonSeed/interface/L3MuonTrajectorySeed.h"
#include "DataFormats/MuonSeed/interface/L3MuonTrajectorySeedCollection.h"

using namespace edm;
using namespace reco;

//
// definition of vectors 
//

void RedundantSeedCleaner::define(std::vector<TrajectorySeed> & coll)
{

  std::vector<TrajectorySeed> triplets;
  
  //search for triplest
  for(TrajectorySeedCollection::iterator itr =coll.begin(); itr != coll.end(); ++itr){
      //fill vector of triplets
      if(itr->nHits()==3) triplets.push_back(*itr);
      
   }

  // clean from shared input
  if (!triplets.empty()) clean(triplets,coll);
}

//
// the sharedHits cleaner
//

void RedundantSeedCleaner::clean(const std::vector<TrajectorySeed> & seedTr, std::vector<TrajectorySeed> & seed) 
{

    // loop over triplets
    std::vector<TrajectorySeed> result;

    std::vector<bool> maskPairs = std::vector<bool>(seed.size(),true);
    int iPair = 0;

    for(TrajectorySeedCollection::iterator s1 =seed.begin(); s1 != seed.end(); ++s1){
       //rechits from seed

       TrajectorySeed::range r1 = s1->recHits();

       for(TrajectorySeedCollection::const_iterator s2 = seedTr.begin(); s2 != seedTr.end(); ++s2){
          //empty
          if(s2->nHits()==0) continue ;

          TrajectorySeed::range r2 = s2->recHits();
          TrajectorySeed::const_iterator h2 = r2.first;

          //number of shared hits;
          int shared = 0;
 
          for(;h2 < r2.second;h2++){
            for(TrajectorySeed::const_iterator h1  = r1.first; h1 < r1.second;h1++){
               if(h2->sharesInput(&(*h1),TrackingRecHit::all)) shared++;
               if(s1->nHits()!=3) LogDebug(theCategory)<< shared<< " shared hits counter if 2 erease the seed.";
            }
          }
          
          if(shared ==2 && s1->nHits()!=3) {
             maskPairs[iPair] = false;
          }

       }//end triplets loop
       ++iPair;
     }// end pairs loop

     iPair = 0;
     //remove pairs in triplets
     for(TrajectorySeedCollection::iterator s1 = seed.begin(); s1 != seed.end(); ++s1){
        if (maskPairs[iPair]) result.push_back(*s1);
        ++iPair;
     }

     // cleaned collection
      seed.swap(result);
}