RootChamberReader.cc

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#include "SimMuon/Neutron/src/RootChamberReader.h"
#include "SimMuon/Neutron/src/RootSimHit.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "TClonesArray.h"
using namespace std;

RootChamberReader::RootChamberReader() : theTree(nullptr), theHits(nullptr), thePosition(0), theSize(0) {}

RootChamberReader::RootChamberReader(TFile *file, const std::string &treeName)
    : theTree((TTree *)file->Get(treeName.c_str())),
      theHits(new TClonesArray("RootSimHit")),
      thePosition(-1),
      theSize(0) {
  if (theTree != nullptr) {
    theTree->SetBranchAddress("Hits", &theHits);
    theSize = theTree->GetEntries();
  }
}

RootChamberReader::~RootChamberReader() {
  //  delete theHits;
  //  delete theTree;
}

void RootChamberReader::read(edm::PSimHitContainer &hits) {
  // if there's no tree, make no events
  if (theTree != nullptr && theSize != 0) {
    ++thePosition;
    // start again from the beginning, if needed
    if (thePosition >= theSize)
      thePosition = 0;
    theTree->GetEntry(thePosition);

    TIter next(theHits);
    RootSimHit *rootHit;
    while ((rootHit = (RootSimHit *)next())) {
      hits.push_back(rootHit->get());
    }
    LogTrace("Neutrons") << "Event " << thePosition << " OF " << theSize << " has " << hits.size() << " hits ";
  }
}