RooDataHistSliceIter.cxx

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/*****************************************************************************
 * Project: RooFit                                                           *
 * Package: RooFitCore                                                       *
 * @(#)root/roofitcore:$Id$
 * Authors:                                                                  *
 *   WV, Wouter Verkerke, UC Santa Barbara, verkerke@slac.stanford.edu       *
 *   DK, David Kirkby,    UC Irvine,         dkirkby@uci.edu                 *
 *                                                                           *
 * Copyright (c) 2000-2005, Regents of the University of California          *
 *                          and Stanford University. All rights reserved.    *
 *                                                                           *
 * Redistribution and use in source and binary forms,                        *
 * with or without modification, are permitted according to the terms        *
 * listed in LICENSE (http://roofit.sourceforge.net/license.txt)             *
 *****************************************************************************/
 
/**
\file RooDataHistSliceIter.cxx
\class RooDataHistSliceIter
\ingroup Roofitcore
 
Iterates over all bins in a RooDataHist that occur in a slice defined by the
bin coordinates of the input sliceSet.
**/
 
#include "RooDataHist.h"
#include "RooArgSet.h"
#include "RooAbsLValue.h"
#include "RooDataHistSliceIter.h"
 
 
////////////////////////////////////////////////////////////////////////////////
/// Construct an iterator over all bins of RooDataHist 'hist' in the slice defined
/// by the values of the arguments in 'sliceArg'
 
RooDataHistSliceIter::RooDataHistSliceIter(RooDataHist& hist, RooAbsArg& sliceArg) : _hist(&hist), _sliceArg(&sliceArg)
{
  // Calculate base index (for 0th bin) for slice
  RooAbsArg* sliceArgInt = hist.get()->find(sliceArg.GetName()) ;
  dynamic_cast<RooAbsLValue&>(*sliceArgInt).setBin(0) ;
 
  if (hist._vars.size()>1) {
    _baseIndex = hist.calcTreeIndex(hist._vars, true);
  } else {
    _baseIndex = 0 ;
  }
 
  _nStep = dynamic_cast<RooAbsLValue&>(*sliceArgInt).numBins() ;
 
//   std::cout << "RooDataHistSliceIter" << std::endl ;
//   hist.Print() ;
//   std::cout << "hist._iterator = " << hist._iterator << std::endl ;
 
  Int_t i=0 ;
  for (const auto arg : hist._vars) {
    if (arg==sliceArgInt) break ;
    i++ ;
  }
  _stepSize = hist._idxMult[i] ;
  _curStep = 0 ;
 
}
 
 
 
////////////////////////////////////////////////////////////////////////////////
/// Copy constructor
 
RooDataHistSliceIter::RooDataHistSliceIter(const RooDataHistSliceIter& other) :
  TIterator(other),
  _hist(other._hist),
  _sliceArg(other._sliceArg),
  _baseIndex(other._baseIndex),
  _stepSize(other._stepSize),
  _nStep(other._nStep),
  _curStep(other._curStep)
{
}
 
 
 
////////////////////////////////////////////////////////////////////////////////
/// Destructor
 
RooDataHistSliceIter::~RooDataHistSliceIter()
{
}
 
 
 
////////////////////////////////////////////////////////////////////////////////
/// Dummy
 
const TCollection* RooDataHistSliceIter::GetCollection() const
{
  return nullptr ;
}
 
 
 
 
////////////////////////////////////////////////////////////////////////////////
/// Iterator increment operator
 
TObject* RooDataHistSliceIter::Next()
{
  if (_curStep==_nStep) {
    return nullptr ;
  }
 
  // Select appropriate entry in RooDataHist
  _hist->get(_baseIndex + _curStep*_stepSize) ;
 
  // Increment iterator position
  _curStep++ ;
 
  return _sliceArg ;
}
 
 
 
////////////////////////////////////////////////////////////////////////////////
/// Reset iterator position to beginning
 
void RooDataHistSliceIter::Reset()
{
  _curStep=0 ;
}
 
 
 
////////////////////////////////////////////////////////////////////////////////
/// Iterator dereference operator, not functional for this iterator
 
TObject *RooDataHistSliceIter::operator*() const
{
   Int_t step = _curStep == 0 ? _curStep : _curStep - 1;
   // Select appropriate entry in RooDataHist
   _hist->get(_baseIndex + step*_stepSize) ;
 
   return _sliceArg ;
}
 
 
////////////////////////////////////////////////////////////////////////////////
/// Returns true if position of this iterator differs from position
/// of iterator 'aIter'
 
bool RooDataHistSliceIter::operator!=(const TIterator &aIter) const
{
   if ((aIter.IsA() == RooDataHistSliceIter::Class())) {
      const RooDataHistSliceIter &iter(dynamic_cast<const RooDataHistSliceIter &>(aIter));
      return (_curStep != iter._curStep);
   }
 
   return false;
}