SeedGeneratorFromRegionHits.cc

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

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




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


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

  unsigned int nHitss =  hitss.size();
  // Modified 10/Jun/2014 Mark Grimes - At 140 pileup this reserve massively overestimates
  // the amount of memory required. Removing it doesn't appear to slow down the algorithm
  // noticeably.
  //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) ) {
      theSeedCreator->makeSeed(seedCollection, hits);
    }
  }
  theHitsGenerator->clear();
}