AdvanceFilter.h

/**************************************************************************
 * basf2 (Belle II Analysis Software Framework)                           *
 * Author: The Belle II Collaboration                                     *
 *                                                                        *
 * See git log for contributors and copyright holders.                    *
 * This file is licensed under LGPL-3.0, see LICENSE.md.                  *
 **************************************************************************/
#pragma once
 
#include <tracking/trackingUtilities/filters/base/Filter.dcl.h>
#include <tracking/trackingUtilities/numerics/WithWeight.h>
#include <tracking/trackingUtilities/numerics/Weight.h>
 
#include <genfit/MeasuredStateOnPlane.h>
#include <genfit/Exception.h>
#include <framework/logging/Logger.h>
 
#include <vector>
#include <string>
 
namespace Belle2 {
  class ModuleParamList;

  template <class AState, class AnAdvancer>
  class AdvanceFilter : public
    TrackingUtilities::Filter<std::pair<const std::vector<TrackingUtilities::WithWeight<const AState*>>, AState*>> {
    using Super = TrackingUtilities::Filter<std::pair<const std::vector<TrackingUtilities::WithWeight<const AState*>>, AState*>>;
 
  public:
    AdvanceFilter() : Super()
    {
      Super::addProcessingSignalListener(&m_advancer);
    }

    void exposeParameters(ModuleParamList* moduleParamList, const std::string& prefix) override
    {
      m_advancer.exposeParameters(moduleParamList, prefix);
    }

    TrackingUtilities::Weight operator()(const std::pair<const std::vector<TrackingUtilities::WithWeight<const AState*>>, AState*>&
                                         pair)
    override
    {
      m_advancer.setMaterialEffectsToParameterValue();
 
      const std::vector<TrackingUtilities::WithWeight<const AState*>>& previousStates = pair.first;
      B2ASSERT("Can not extrapolate with nothing", not previousStates.empty());
 
      const AState* lastState = previousStates.back();
      AState* currentState = pair.second;
 
      B2ASSERT("Can not extrapolate with nothing", lastState->mSoPSet());
      genfit::MeasuredStateOnPlane mSoP = lastState->getMeasuredStateOnPlane();
 
      double returnValue = NAN;
      try {
        genfit::SharedPlanePtr plane = currentState->getPlane(mSoP);
        returnValue = m_advancer.extrapolateToPlane(mSoP, plane);
      } catch (genfit::Exception& e) {
        B2DEBUG(29, "Plane extraction failed: " << e.what());
      }
 
      if (not std::isnan(returnValue)) {
        currentState->setMeasuredStateOnPlane(mSoP);
      }
 
      m_advancer.resetMaterialEffects();
 
      return returnValue;
    }
 
  private:
    AnAdvancer m_advancer;
  };

}