/data/refman/pasoursint/CMSSW_5_3_0/src/RecoVertex/GhostTrackFitter/src/GhostTrackFitter.cc

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#include <memory>
#include <vector>

#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "DataFormats/GeometryVector/interface/GlobalVector.h" 
#include "DataFormats/GeometryVector/interface/VectorUtil.h" 
#include "DataFormats/GeometryCommonDetAlgo/interface/GlobalError.h"

#include "TrackingTools/TransientTrack/interface/TransientTrack.h"

#include "RecoVertex/GhostTrackFitter/interface/GhostTrack.h"
#include "RecoVertex/GhostTrackFitter/interface/GhostTrackState.h"
#include "RecoVertex/GhostTrackFitter/interface/GhostTrackPrediction.h"

#include "RecoVertex/GhostTrackFitter/interface/GhostTrackFitter.h"

#include "RecoVertex/GhostTrackFitter/interface/AnnealingGhostTrackFitter.h"
#include "RecoVertex/GhostTrackFitter/interface/PositiveSideGhostTrackFitter.h"
#include "RecoVertex/GhostTrackFitter/interface/KalmanGhostTrackUpdater.h"

using namespace reco;

GhostTrackFitter::GhostTrackFitter()
{
        fitter.reset(new AnnealingGhostTrackFitter);
        updater.reset(new KalmanGhostTrackUpdater);
}

GhostTrackFitter::~GhostTrackFitter()
{
}

GhostTrack GhostTrackFitter::fit(
                        const GlobalPoint &priorPosition,
                        const GlobalError &priorError,
                        const GlobalVector &direction,
                        double coneRadius,
                        const std::vector<TransientTrack> &tracks) const
{
        GhostTrackPrediction prior(priorPosition, priorError,
                                   direction, coneRadius);
        return fit(prior, priorPosition, tracks);
}

GhostTrack GhostTrackFitter::fit(
                        const GlobalPoint &priorPosition,
                        const GlobalError &priorError,
                        const GlobalVector &direction,
                        const GlobalError &directionError,
                        const std::vector<TransientTrack> &tracks) const
{
        GhostTrackPrediction prior(priorPosition, priorError,
                                   direction, directionError);
        return fit(prior, priorPosition, tracks);
}

GhostTrack GhostTrackFitter::fit(
                        const GhostTrackPrediction &prior,
                        const GlobalPoint &origin,
                        const std::vector<TransientTrack> &tracks) const
{
        double offset = prior.lambda(origin);

        std::vector<GhostTrackState> states;
        for(std::vector<TransientTrack>::const_iterator iter = tracks.begin();
            iter != tracks.end(); ++iter) {
                GhostTrackState state(*iter);
                state.linearize(prior, true, offset);
                states.push_back(state);
        }

        PositiveSideGhostTrackFitter actualFitter(origin, *fitter);
        return fit(actualFitter, prior, states);
}

GhostTrack GhostTrackFitter::fit(
                        const GhostTrackPrediction &prior,
                        const std::vector<TransientTrack> &tracks) const
{
        std::vector<GhostTrackState> states;
        for(std::vector<TransientTrack>::const_iterator iter = tracks.begin();
            iter != tracks.end(); ++iter) {
                GhostTrackState state(*iter);
                state.linearize(prior, true);
                states.push_back(state);
        }

        return fit(*fitter, prior, states);
}

GhostTrack GhostTrackFitter::fit(
                        FitterImpl &fitterImpl,
                        const GhostTrackPrediction &prior,
                        const std::vector<GhostTrackState> &states_) const
{
        std::vector<GhostTrackState> states = states_;

        double ndof, chi2;
        GhostTrackPrediction pred =
                        fitterImpl.fit(*updater, prior, states, ndof, chi2);

        GhostTrack result(prior, pred, states, ndof, chi2);

        return result;
}