G4RootRNtupleManager.cc

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// Author: Ivana Hrivnacova, 09/04/2014 (ivana@ipno.in2p3.fr)
 
#include "G4RootRNtupleManager.hh"
#include "G4RootRFileManager.hh"
#include "G4AnalysisManagerState.hh"
#include "G4AnalysisUtilities.hh"
 
#include "tools/rroot/file"
#include "tools/rroot/rall"
#include "tools/rroot/streamers"
#include "tools/rroot/fac"
#include "tools/rroot/tree"
 
using namespace G4Analysis;
 
//_____________________________________________________________________________
G4RootRNtupleManager::G4RootRNtupleManager(const G4AnalysisManagerState& state)
 : G4TRNtupleManager<tools::rroot::ntuple>(state)
{}
 
//
// private methods
//
 
//_____________________________________________________________________________
G4int G4RootRNtupleManager::ReadNtupleImpl(const G4String& ntupleName,
                                           const G4String& fileName,
                                           const G4String& dirName,
                                           G4bool isUserFileName)
{
  Message(kVL4, "read", "ntuple", ntupleName);
 
  // Ntuples are saved per thread
  // but do not apply the thread suffix if fileName is provided explicitly
  auto isPerThread = true;
  if ( isUserFileName ) isPerThread = false;
 
  // Get or open a file
  auto rfile = fFileManager->GetRFile(fileName, isPerThread);
  if ( ! rfile ) {
    if ( ! fFileManager->OpenRFile(fileName, isPerThread) ) return kInvalidId;
    rfile = fFileManager->GetRFile(fileName, isPerThread);
  }
 
  // Get key
  tools::rroot::key* key = nullptr;
  tools::rroot::TDirectory* newDir = nullptr;
  if ( ! dirName.empty() ) {
    newDir = tools::rroot::find_dir(rfile->dir(), dirName);
    if ( newDir ) {
      key = newDir->find_key(ntupleName);
    }
    else {
      G4Analysis::Warn(
        "Directory " + dirName + " not found in file " + fileName + ".",
        fkClass, "ReadNtupleImpl");
      return kInvalidId;
    }
  }
  else {
    key = rfile->dir().find_key(ntupleName);
  }
 
  if ( ! key ) {
    Warn("Key " + ntupleName + " for Ntuple not found in file " + fileName +
      ", directory " + dirName, fkClass, "ReadNtupleImpl");
    delete newDir;
    return kInvalidId;
  }
 
  unsigned int size;
  char* charBuffer = key->get_object_buffer(*rfile, size);
  if ( ! charBuffer ) {
    Warn("Cannot get data buffer for Ntuple " + ntupleName +
         " in file " + fileName, fkClass, "ReadNtupleImpl");
    delete newDir;
    return kInvalidId;
  }
 
  auto verbose = false;
  auto buffer
    = new tools::rroot::buffer(G4cout, rfile->byte_swap(), size, charBuffer,
                               key->key_length(), verbose);
  buffer->set_map_objs(true);
 
  auto fac = new tools::rroot::fac(G4cout);
 
  auto tree = new tools::rroot::tree(*rfile, *fac);
  if ( ! tree->stream(*buffer) ) {
    Warn("TTree streaming failed for Ntuple " + ntupleName +
         " in file " + fileName,
         fkClass, "ReadNtupleImpl");
 
    delete buffer;
    delete tree;
    delete newDir;
    return kInvalidId;
  }
 
  auto rntuple  = new tools::rroot::ntuple(*tree); //use the flat ntuple API.
  auto rntupleDescription = new G4TRNtupleDescription<tools::rroot::ntuple>(rntuple);
 
  auto id = SetNtuple(rntupleDescription);
 
  Message(kVL2, "read", "ntuple", ntupleName, id > kInvalidId);
 
  return id;
}
 
//_____________________________________________________________________________
G4bool G4RootRNtupleManager::GetTNtupleRow(
  G4TRNtupleDescription<tools::rroot::ntuple>* ntupleDescription)
{
  auto ntuple = ntupleDescription->fNtuple;
  auto ntupleBinding = ntupleDescription->fNtupleBinding;
 
  G4bool isInitialized = ntupleDescription->fIsInitialized;
  if ( ! isInitialized ) {
 
    if ( ! ntuple->initialize(G4cout, *ntupleBinding) ) {
      Warn("Ntuple initialization failed !!", fkClass, "GetTNtupleRow");
      return false;
    }
    ntupleDescription->fIsInitialized = true;
    ntuple->start();
  }
 
  auto next = ntuple->next();
  if ( next ) {
    if ( ! ntuple->get_row() ) {
      Warn("Ntuple get_row() failed !!", fkClass, "GetTNtupleRow");
      return false;
    }
  }
 
  return next;
}