/data/refman/pasoursint/CMSSW_5_3_3/src/RecoMuon/L3TrackFinder/src/EtaPhiEstimator.h

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#include "TrackingTools/KalmanUpdators/interface/Chi2MeasurementEstimatorBase.h"
#include "DataFormats/Math/interface/deltaPhi.h"
#include "DataFormats/Math/interface/deltaR.h"

class EtaPhiEstimator : public Chi2MeasurementEstimatorBase {
 public:

  explicit EtaPhiEstimator(double eta, double phi,
                           const Chi2MeasurementEstimatorBase * estimator): 
    Chi2MeasurementEstimatorBase(estimator->chiSquaredCut(),
                                 estimator->nSigmaCut()),
    estimator_(estimator),
    thedEta(eta),
    thedPhi(phi),
    thedEta2(eta*eta),
    thedPhi2(phi*phi)
      { }

    virtual std::pair<bool,double> estimate(const TrajectoryStateOnSurface& tsos,
                                            const TransientTrackingRecHit& aRecHit) const{
      
      std::pair<bool,double> primaryResult = estimator_->estimate(tsos,aRecHit);

      double dEta = fabs(tsos.globalPosition().eta() - aRecHit.globalPosition().eta());
      double dPhi = deltaPhi< double > (tsos.globalPosition().phi(), aRecHit.globalPosition().phi());

      double check = (dEta*dEta)/(thedEta2) + (dPhi*dPhi)/(thedPhi2);
      
      LogDebug("EtaPhiMeasurementEstimator")<< " The state to compare with is \n"<< tsos
                                            << " The hit position is:\n" << aRecHit.globalPosition()
                                            << " deta: "<< dEta<< " dPhi: "<<dPhi<<" check: "<<check<<" primaryly: "<< primaryResult.second;

      if (check <= 1)
        //      if (dEta < thedEta && dPhi <thedPhi)
        return std::make_pair(true, primaryResult.second);
      else
        return std::make_pair(false, primaryResult.second);
    }
    
    virtual EtaPhiEstimator* clone() const {
      return new EtaPhiEstimator(*this);
    }

 private:
    const Chi2MeasurementEstimatorBase * estimator_;
    double thedEta,thedPhi,thedEta2,thedPhi2;
};