GFFieldManager.h

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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>

namespace genf {

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

  public:
    GFAbsBField* getField()
    {
      if (fField == NULL) {
        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 == NULL) {
        std::cerr << "Appareantly GFFieldManager hasnt been instantiated yet, call getInstance() "
                     "and init() before getFieldVal() -> abort"
                  << std::endl;
        throw;
      }
      if (fField == NULL) {
        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 == NULL) { fInstance = new GFFieldManager(); }
      return fInstance;
    }
  };
}
#endif