geant4/source/analysis/root/include/G4RootHnRFileManager.icc

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// Author: Ivana Hrivnacova, 26/08/2021 (ivana@ipno.in2p3.fr)

#include "G4AnalysisUtilities.hh"

#include "tools/rroot/file"
#include "tools/rroot/rall"
#include "tools/rroot/streamers"

//_____________________________________________________________________________
template <typename HT>
inline
std::tuple<tools::rroot::buffer*, tools::rroot::TDirectory*>
G4RootHnRFileManager<HT>::GetBuffer(
  const G4String& fileName, const G4String& dirName, const G4String& objectName)
{
// Get buffer for reading histogram or profile specified by objectNmae
// for a file specified by fileName;
// Open the file if it was not yet open

  // Histograms and profiles are not saved per thread
  G4bool isPerThread = false;

  // Get or open a file
  auto rfile = fRFileManager->GetRFile(fileName, isPerThread);
  if ( ! rfile ) {
    if ( ! fRFileManager->OpenRFile(fileName, isPerThread) ) {
      return std::tuple(nullptr, nullptr);
    }
    rfile = fRFileManager->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(objectName);
    }
    else {
      G4Analysis::Warn(
        "Directory " + dirName + " not found in file " + fileName + ".",
        fkClass, "GetBuffer");
      return std::tuple(nullptr, nullptr);
    }
  }
  else {
    key = rfile->dir().find_key(objectName);
  }

  if ( ! key ) {
    G4Analysis::Warn(
      "Key " + objectName + " for Histogram/Profile not found in file " +
      fileName + ", directory " + dirName, fkClass, "GetBuffer");
    return std::tuple(nullptr, newDir);
  }

  unsigned int size;
  char* charBuffer = key->get_object_buffer(*rfile, size);

  if ( ! charBuffer ) {
    G4Analysis::Warn(
      "Cannot get " + objectName + " in file " + fileName,
      fkClass, "GetBuffer");
    return std::tuple(nullptr, newDir);
  }

  auto verbose = false;
  return std::tuple(new tools::rroot::buffer(G4cout, rfile->byte_swap(), size, charBuffer,
                                             key->key_length(), verbose), newDir);
}

//_____________________________________________________________________________
template <>
inline
tools::histo::h1d* G4RootHnRFileManager<tools::histo::h1d>::ReadT(
  tools::rroot::buffer* buffer)
{
  return tools::rroot::TH1D_stream(*buffer);
}

//_____________________________________________________________________________
template <>
inline
tools::histo::h2d* G4RootHnRFileManager<tools::histo::h2d>::ReadT(
  tools::rroot::buffer* buffer)
{
  return tools::rroot::TH2D_stream(*buffer);
}

//_____________________________________________________________________________
template <>
inline
tools::histo::h3d* G4RootHnRFileManager<tools::histo::h3d>::ReadT(
  tools::rroot::buffer* buffer)
{
  return tools::rroot::TH3D_stream(*buffer);
}

//_____________________________________________________________________________
template <>
inline
tools::histo::p1d* G4RootHnRFileManager<tools::histo::p1d>::ReadT(
  tools::rroot::buffer* buffer)
{
  return tools::rroot::TProfile_stream(*buffer);
}

//_____________________________________________________________________________
template <>
inline
tools::histo::p2d* G4RootHnRFileManager<tools::histo::p2d>::ReadT(
  tools::rroot::buffer* buffer)
{
  return tools::rroot::TProfile2D_stream(*buffer);
}

//_____________________________________________________________________________
template <typename HT>
inline
HT* G4RootHnRFileManager<HT>::Read(
  const G4String& htName, const G4String& fileName, const G4String& dirName,
  G4bool /*isUserFileName*/)
{
  auto [buffer, newDir] = GetBuffer(fileName, dirName, htName);
  if ( ! buffer ) {
    delete newDir;
    return nullptr;
  }

  auto ht = ReadT(buffer);
  delete buffer;
  delete newDir;

  if ( ! ht ) {
    G4Analysis::Warn(
      "Streaming " + htName + " in file " + fileName + " failed.",
      fkClass, "Read");
    return nullptr;
  }

  return ht;
}