/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_14/src/TrackingTools/GsfTools/src/MultiTrajectoryStateTransform.cc

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#include "TrackingTools/GsfTools/interface/MultiTrajectoryStateTransform.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"

#include "DataFormats/TrackReco/interface/TrackExtraFwd.h"
#include "DataFormats/GsfTrackReco/interface/GsfTrackExtraFwd.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateOnSurface.h"
#include "TrackingTools/GsfTools/interface/BasicMultiTrajectoryState.h"
#include "TrackingTools/TrajectoryParametrization/interface/LocalTrajectoryParameters.h"
#include "TrackingTools/TrajectoryParametrization/interface/LocalTrajectoryError.h"
#include "Geometry/CommonDetUnit/interface/TrackingGeometry.h"
#include "Geometry/CommonDetUnit/interface/GeomDet.h"
#include "TrackingTools/GeomPropagators/interface/AnalyticalPropagator.h"
#include "TrackingTools/GsfTools/interface/GsfPropagatorAdapter.h"
#include "TrackingTools/PatternTools/interface/TransverseImpactPointExtrapolator.h"
#include "TrackingTools/GsfTools/interface/MultiTrajectoryStateMode.h"

MultiTrajectoryStateTransform::~MultiTrajectoryStateTransform () {delete extrapolator_;}

TrajectoryStateOnSurface 
MultiTrajectoryStateTransform::outerStateOnSurface(const reco::GsfTrack& tk) const
{
  return checkGeometry() ? outerStateOnSurface(tk,*geometry_,field_) : TrajectoryStateOnSurface();
}

TrajectoryStateOnSurface 
MultiTrajectoryStateTransform::innerStateOnSurface(const reco::GsfTrack& tk) const
{
  return checkGeometry() ? innerStateOnSurface(tk,*geometry_,field_) : TrajectoryStateOnSurface();
}

bool
MultiTrajectoryStateTransform::outerMomentumFromMode (const reco::GsfTrack& tk,
                                                      GlobalVector& momentum) const
{
  return MultiTrajectoryStateMode().momentumFromModeCartesian(outerStateOnSurface(tk),momentum);
}

bool
MultiTrajectoryStateTransform::innerMomentumFromMode (const reco::GsfTrack& tk,
                                                      GlobalVector& momentum) const
{
  return MultiTrajectoryStateMode().momentumFromModeCartesian(outerStateOnSurface(tk),momentum);
}

TrajectoryStateOnSurface 
MultiTrajectoryStateTransform::outerStateOnSurface( const reco::GsfTrack& tk, 
                                                    const TrackingGeometry& geom,
                                                    const MagneticField* field) const
{
  const Surface& surface = geom.idToDet( DetId( tk.extra()->outerDetId()))->surface();

  const reco::GsfTrackExtraRef& extra(tk.gsfExtra());
  return stateOnSurface(extra->outerStateWeights(),
                        extra->outerStateLocalParameters(),
                        extra->outerStateCovariances(),
                        extra->outerStateLocalPzSign(),
                        surface,field);
}

TrajectoryStateOnSurface 
MultiTrajectoryStateTransform::innerStateOnSurface( const reco::GsfTrack& tk, 
                                                    const TrackingGeometry& geom,
                                                    const MagneticField* field) const
{
  const Surface& surface = geom.idToDet( DetId( tk.extra()->innerDetId()))->surface();

  const reco::GsfTrackExtraRef& extra(tk.gsfExtra());
  return stateOnSurface(extra->innerStateWeights(),
                        extra->innerStateLocalParameters(),
                        extra->innerStateCovariances(),
                        extra->innerStateLocalPzSign(),
                        surface,field);
}

TrajectoryStateOnSurface 
MultiTrajectoryStateTransform::stateOnSurface (const std::vector<double>& weights,
                                               const std::vector<ParameterVector>& parameters,
                                               const std::vector<CovarianceMatrix>& covariances,
                                               const double& pzSign,
                                               const Surface& surface,
                                               const MagneticField* field) const
{
  if ( weights.empty() )  return TrajectoryStateOnSurface();
  
  unsigned int nc(weights.size());
  AlgebraicVector5 pars;
  AlgebraicSymMatrix55 cov;
  
  std::vector<TrajectoryStateOnSurface> components;
  components.reserve(nc);
  
  // create components TSOSs
  for ( unsigned int i=0; i<nc; i++ ) {
    // convert parameter vector and covariance matrix
    for ( unsigned int j1=0; j1<dimension; j1++ ) {
      pars[j1] = parameters[i](j1);
      for ( unsigned int j2=0; j2<=j1; j2++ ) 
        cov(j1,j2) = covariances[i](j1,j2);          //FIXME: SMatrix copy constructor should handle this!!
    }
    // create local parameters & errors
    LocalTrajectoryParameters lp(pars,pzSign);
    LocalTrajectoryError le(cov);
    // create component
    components.push_back(TrajectoryStateOnSurface(lp,le,surface,field,weights[i]));
  }
  return 
    TrajectoryStateOnSurface(new BasicMultiTrajectoryState(components));
}

bool
MultiTrajectoryStateTransform::checkGeometry () const
{
  if ( geometry_ && field_ )  return true;

  edm::LogError("MultiTrajectoryStateTransform") << "Missing ES components";
  return false;
}

TrajectoryStateOnSurface 
MultiTrajectoryStateTransform::extrapolatedState (const TrajectoryStateOnSurface tsos,
                                                  const GlobalPoint& point) const
{
  return checkExtrapolator() ? extrapolator_->extrapolate(tsos,point) : TrajectoryStateOnSurface();
}

bool
MultiTrajectoryStateTransform::checkExtrapolator () const
{
  if ( extrapolator_ )  return true;

  if ( field_==0 ) {
    edm::LogError("MultiTrajectoryStateTransform") << "Missing magnetic field";
    return false;
  }

  GsfPropagatorAdapter gsfPropagator(AnalyticalPropagator(field_,anyDirection));
  extrapolator_ = new TransverseImpactPointExtrapolator(gsfPropagator);
  return true;
}