GFFieldManager.h

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//****************************************************************************
//*                   This file is part of PandaRoot.                        *
//*                                                                          *
//*            PandaRoot is distributed under the terms of the               *
//*              GNU General Public License (GPL) version 3,                 *
//*                 copied verbatim in the file "LICENSE".                   *
//*                                                                          *
//*  Copyright (C) 2006 - 2024 FAIR GmbH and copyright holders of PandaRoot  *
//*     The copyright holders are listed in the file "COPYRIGHTHOLDERS".     *
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//****************************************************************************

/* Copyright 2008-2010, Technische Universitaet Muenchen,
   Authors: Christian Hoeppner & Sebastian Neubert

   This file is part of GENFIT.

   GENFIT is free software: you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as published
   by the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   GENFIT is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with GENFIT.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef GFFIELDMANAGER_H
#define GFFIELDMANAGER_H

#include "GFAbsBField.h"
#include <iostream>

class GFFieldManager {
 private:
  GFFieldManager() {}
  static GFFieldManager *fInstance;
  static GFAbsBField *fField;

 public:
  GFAbsBField *getField()
  {
    if (fField == nullptr) {
      std::cerr << "Appareantly GFFieldManager hasnt been initialized with a correct GFAbsBField pointer -> abort" << std::endl;
      throw;
    }
    return fField;
  }

  static TVector3 getFieldVal(const TVector3 &x)
  {
    if (fInstance == nullptr) {
      std::cerr << "Appareantly GFFieldManager hasnt been instantiated yet, call getInstance() and init() before getFieldVal() -> abort" << std::endl;
      throw;
    }
    if (fField == nullptr) {
      std::cerr << "Appareantly GFFieldManager hasnt been initialized with a correct GFAbsBField pointer -> abort" << std::endl;
      throw;
    }
    return fField->get(x);
  }

  void init(GFAbsBField *b) { fField = b; }

  static GFFieldManager *getInstance()
  {
    if (fInstance == nullptr) {
      fInstance = new GFFieldManager();
    }
    return fInstance;
  }
};

#endif