ParticleSvc.h

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// SPDX-License-Identifier: LGPL-3.0-or-later
// Copyright (C) 2022 Whitney Armstrong, Sylvester Joosten
 
#ifndef PARTICLESVC_H
#define PARTICLESVC_H
 
#include <map>
 
#include "GaudiKernel/Service.h"
 
#include "JugBase/IParticleSvc.h"
 
/** Simple particle service.
 *
 *  This meant to provide basic particle information for reconstruction purposes.
 *  If particle data is needed, be sure to grab everything you can in an initialization
 *  step. Currently the  returned Particle/ParticleMap are by value.
 */
class ParticleSvc : public extends<Service, IParticleSvc> {
public:
  using Particle    = Jug::Base::ParticleData;
  using ParticleMap = std::map<int, Particle>;
 
  const ParticleMap m_particleMap;
 
public:
  ParticleSvc(const std::string& name, ISvcLocator* svc);
 
  virtual ~ParticleSvc();
 
  virtual StatusCode initialize() final;
  virtual StatusCode finalize() final { return StatusCode::SUCCESS; }
 
  virtual ParticleMap particleMap() const { return m_particleMap; }
  virtual Particle particle(int pdg) const {
    if (m_particleMap.count(pdg) == 0) {
      // error
      return m_particleMap.at(0);
    }
    return m_particleMap.at(pdg);
  }
};
 
#endif