CDCCKFPathSelector.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/trackFindingCDC/findlets/base/Findlet.h>
#include <tracking/trackFindingCDC/utilities/Algorithms.h>
#include <tracking/ckf/cdc/entities/CDCCKFPath.h>
 
#include <tracking/ckf/cdc/filters/pathPairs/CDCPathPairFilterFactory.h>
#include <tracking/trackFindingCDC/filters/base/ChooseableFilter.icc.h>
#include <tracking/trackFindingCDC/utilities/StringManipulation.h>
#include <framework/core/ModuleParamList.h>
 
namespace Belle2 {
  class CDCCKFPathSelector : public TrackFindingCDC::Findlet<CDCCKFPath> {
  public:
    CDCCKFPathSelector()
    {
      addProcessingSignalListener(&m_filter);
    }
 
    void exposeParameters(ModuleParamList* moduleParamList, const std::string& prefix) override
    {
      moduleParamList->addParameter(TrackFindingCDC::prefixed(prefix, "maximalCandidatesInFlight"),
                                    m_maximalCandidatesInFlight,
                                    "Maximal candidates in flight", m_maximalCandidatesInFlight);
      m_filter.exposeParameters(moduleParamList, prefix);
    }
 
    void apply(std::vector<CDCCKFPath>& newPaths) override
    {
      const auto pathComparison = [&](const CDCCKFPath & lhs, const CDCCKFPath & rhs) {
        return m_filter(std::pair(&lhs, &rhs)) > 0;
      };
      std::sort(newPaths.begin(), newPaths.end(), pathComparison);
 
      TrackFindingCDC::only_best_N(newPaths, m_maximalCandidatesInFlight);
    }
 
  private:
    size_t m_maximalCandidatesInFlight = 3;
    TrackFindingCDC::ChooseableFilter<CDCPathPairFilterFactory> m_filter;
  };
}