// Copyright CERN and copyright holders of ALICE O2. This software is

// distributed under the terms of the GNU General Public License v3 (GPL

// Version 3), copied verbatim in the file "COPYING".

//

// See http://alice-o2.web.cern.ch/license for full licensing information.

//

// In applying this license CERN does not waive the privileges and immunities

// granted to it by virtue of its status as an Intergovernmental Organization

// or submit itself to any jurisdiction.

#include "Field/MagFieldFact.h"

#include "FairField.h"

#include "FairLogger.h"

#include "FairRuntimeDb.h"

#include "Field/MagFieldParam.h"

#include "Field/MagneticField.h"

#include <iostream>

using std::cerr;

using std::cout;

using std::endl;

using namespace o2::field;

ClassImp(MagFieldFact);

static MagFieldFact gMagFieldFact;

MagFieldFact::MagFieldFact() : FairFieldFactory(), mFieldPar(nullptr) { fCreator = this; }

MagFieldFact::~MagFieldFact() = default;

void MagFieldFact::SetParm()

{

auto RunDB = FairRuntimeDb::instance();

mFieldPar = (MagFieldParam*)RunDB->getContainer("MagFieldParam");

}

FairField* MagFieldFact::createFairField()

{

if (!mFieldPar) {

LOG(ERROR) << "MagFieldFact::createFairField: No field parameters available";

return nullptr;

}

// since we have just 1 field class, we don't need to consider fFieldPar->GetType()

std::cerr << "creating the field as unmanaged pointer\n";

// we have to use naked "new" here since the FairRootAna or TGeoGlobalMagField expect

// bare pointer on the field which they eventually destroy

return new MagneticField(*mFieldPar);

}