/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_13_patch3/src/RecoTracker/TkSeedGenerator/src/SeedGeneratorFromRegionHits.cc

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#include "RecoTracker/TkSeedGenerator/interface/SeedGeneratorFromRegionHits.h"

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

#include "RecoTracker/TkTrackingRegions/interface/OrderedHitsGenerator.h"
#include "RecoTracker/TkTrackingRegions/interface/TrackingRegion.h"
#include "RecoTracker/TkSeedingLayers/interface/SeedComparitor.h"
#include "RecoTracker/TkSeedGenerator/interface/SeedCreator.h"


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

#include <vector>

#include "MagneticField/Engine/interface/MagneticField.h"
#include "MagneticField/Records/interface/IdealMagneticFieldRecord.h"

namespace {
  template <class T> T sqr( T t) {return t*t;}
}

SeedGeneratorFromRegionHits::SeedGeneratorFromRegionHits(
    OrderedHitsGenerator *ohg, SeedComparitor* asc, SeedCreator* asp)
  : theHitsGenerator(ohg), theComparitor(asc), theSeedCreator(asp)
{ }


SeedGeneratorFromRegionHits::~SeedGeneratorFromRegionHits()
{
  delete theHitsGenerator;
  delete theComparitor;
  delete theSeedCreator;
}

void SeedGeneratorFromRegionHits::run(TrajectorySeedCollection & seedCollection, 
    const TrackingRegion & region, const edm::Event& ev, const edm::EventSetup& es)
{
  if (theComparitor) theComparitor->init(es);
  const OrderedSeedingHits & hitss = theHitsGenerator->run(region, ev, es);

  unsigned int nHitss =  hitss.size();
  if (seedCollection.empty()) seedCollection.reserve(nHitss); // don't do multiple reserves in the case of multiple regions: it would make things even worse
                                                              // as it will cause N re-allocations instead of the normal log(N)/log(2)
  for (unsigned int iHits = 0; iHits < nHitss; ++iHits) { 
    const SeedingHitSet & hits =  hitss[iHits];
    if (!theComparitor || theComparitor->compatible(hits, region) ) {
      theSeedCreator->trajectorySeed(seedCollection, hits, region, es, theComparitor);
    }
  }
  theHitsGenerator->clear();
}