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MCEventHeader.cxx
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69 lines (57 loc) · 1.98 KB
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// 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.
/// \author R+Preghenella - August 2017
#include "SimulationDataFormat/MCEventHeader.h"
#include "FairRootManager.h"
#include <TFile.h>
#include <TTree.h>
namespace o2
{
namespace dataformats
{
/*****************************************************************/
/*****************************************************************/
void MCEventHeader::Reset()
{
/** reset **/
FairMCEventHeader::Reset();
clearInfo();
mEmbeddingFileName.clear();
mEmbeddingEventIndex = 0;
}
void MCEventHeader::extractFileFromKinematics(std::string_view kinefilename, std::string_view targetfilename)
{
auto oldfile = TFile::Open(kinefilename.data());
auto kinetree = (TTree*)oldfile->Get("o2sim");
// deactivate all branches
kinetree->SetBranchStatus("*", 0);
// activate the header branch
kinetree->SetBranchStatus("MCEventHeader*", 1);
// create a new file + a clone of old tree header. Do not copy events
auto newfile = TFile::Open(targetfilename.data(), "RECREATE");
auto newtree = kinetree->CloneTree(0);
// here we copy the branches
newtree->CopyEntries(kinetree, kinetree->GetEntries());
newtree->SetEntries(kinetree->GetEntries());
// flush to disk
newtree->Write();
newfile->Close();
delete newfile;
// clean
if (oldfile) {
oldfile->Close();
delete oldfile;
}
}
/*****************************************************************/
/*****************************************************************/
} /* namespace dataformats */
} /* namespace o2 */
ClassImp(o2::dataformats::MCEventHeader);