BDSOutputLoader.cc

/* 
Beam Delivery Simulation (BDSIM) Copyright (C) BDSIM Collaboration, 2001 - 2026.
 
This file is part of BDSIM.
 
BDSIM is free software: you can redistribute it and/or modify 
it under the terms of the GNU General Public License as published 
by the Free Software Foundation version 3 of the License.
 
BDSIM 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 General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with BDSIM.  If not, see <http://www.gnu.org/licenses/>.
*/
#include "BDSDebug.hh"
#include "BDSException.hh"
#include "BDSOutputLoader.hh"
#include "BDSOutputROOTEventBeam.hh"
#include "BDSOutputROOTEventHeader.hh"
#include "BDSOutputROOTEventInfo.hh"
#include "BDSOutputROOTEventOptions.hh"
 
#include "parser/beam.h"
#include "parser/beamBase.h"
#include "parser/options.h"
#include "parser/optionsBase.h"
 
#include "globals.hh" // geant4 types / globals
 
#include "TFile.h"
#include "TList.h"
#include "TTree.h"
 
 
BDSOutputLoader::BDSOutputLoader(const G4String& filePath):
  dataVersion(-1),
  nOriginalEvents(0),
  badFilePath(true),
  rootEventFile(false),
  localBeam(nullptr),
  localOptions(nullptr),
  localEventSummary(nullptr),
  beamTree(nullptr),
  optionsTree(nullptr),
  eventTree(nullptr)
{
  G4cout << __METHOD_NAME__ << "Opening file: " << filePath << G4endl;
  // open file - READ mode to prevent accidental corruption by adding new things
  file = new TFile(filePath.c_str(), "READ");
  
  // check it's a valid file
  badFilePath = file->IsZombie();
  if (badFilePath)
    {throw BDSException(__METHOD_NAME__, "No such file \"" + filePath + "\"");}
  else
    {// check it's a rootevent file - TBC - use analysis IsBDSIMFile after restructure
      rootEventFile = file->GetListOfKeys()->Contains("Event");
      if (!rootEventFile)
        {throw BDSException(__METHOD_NAME__, "Not a BDSIM rootevent output format ROOT file");}
    }
 
  // extract data version
  TTree* headerTree = dynamic_cast<TTree*>(file->Get("Header"));
  if (!headerTree) // no header -> definitely not a bdsim file
    {throw BDSException(__METHOD_NAME__, "\"" + filePath + "\" Not a BDSIM output file");}
  BDSOutputROOTEventHeader* headerLocal = new BDSOutputROOTEventHeader();
  headerTree->SetBranchAddress("Header.", &headerLocal);
  headerTree->GetEntry(0);
  dataVersion = headerLocal->dataVersion;
  nOriginalEvents = headerLocal->nOriginalEvents;
  delete headerLocal;
 
  beamTree = dynamic_cast<TTree*>(file->Get("Beam"));
  if (!beamTree)
    {throw BDSException(__METHOD_NAME__, "Invalid file \"" + filePath + "\" - doesn't contain beam Tree");}
  localBeam = new BDSOutputROOTEventBeam();
  beamTree->SetBranchAddress("Beam.", &localBeam);
  beamTree->GetEntry(0);
 
  // set up local structure copies.
  optionsTree = dynamic_cast<TTree*>(file->Get("Options"));
  if (!optionsTree)
    {throw BDSException(__METHOD_NAME__, "Invalid file \"" + filePath + "\" - doesn't contain options structure.");}
  localOptions = new BDSOutputROOTEventOptions();
  optionsTree->SetBranchAddress("Options.", &localOptions);
  optionsTree->GetEntry(0);
  
  eventTree = dynamic_cast<TTree*>(file->Get("Event"));
  localEventSummary = new BDSOutputROOTEventInfo();
  if (dataVersion < 4)
    {eventTree->SetBranchAddress("Info.", &localEventSummary);}
  else
    {eventTree->SetBranchAddress("Summary.", &localEventSummary);}
}
 
BDSOutputLoader::~BDSOutputLoader()
{
  delete file; // closes if open
  delete localBeam;
  delete localOptions;
  delete localEventSummary;
}
 
GMAD::BeamBase BDSOutputLoader::BeamBaseClass()
{
  // always change back to this file - assuming other root files could be open
  file->cd();
  beamTree->GetEntry(0);
  return *(static_cast<GMAD::BeamBase*>(localBeam));
}
 
GMAD::Beam BDSOutputLoader::Beam()
{
  return GMAD::Beam(BeamBaseClass());
}
 
GMAD::OptionsBase BDSOutputLoader::OptionsBaseClass()
{
  // always change back to this file - assuming other root files could be open
  file->cd();
  optionsTree->GetEntry(0);
  return *(static_cast<GMAD::OptionsBase*>(localOptions));
}
 
GMAD::Options BDSOutputLoader::Options()
{
  return GMAD::Options(OptionsBaseClass());
}
 
G4String BDSOutputLoader::SeedState(G4int eventNumber)
{
  // always change back to this file - assuming other root files could be open
  file->cd();
 
  // cannot retrieve a seed state beyond that in the file - protection here to
  // make life simpler elsewhere
  if (eventNumber > eventTree->GetEntries())
    {
      G4cout << __METHOD_NAME__ << "event index beyond number stored in file - no seed state loaded" << G4endl;
      return "";
    }
  eventTree->GetEntry((int)eventNumber);
  
  return G4String(localEventSummary->seedStateAtStart);
}