RooChangeTracker.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 RooChangeTracker.cxx
\class RooChangeTracker
\ingroup Roofitcore
 
Meta object that tracks value
changes in a given set of RooAbsArgs by registering itself as value
client of these objects. The change tracker can perform an
additional validation step where it also compares the numeric
values of the tracked arguments with reference values to ensure
that values have actually changed. This may be useful in case some
of the tracked observables are in binned datasets where each
observable propagates a valueDirty flag when an event is loaded even
though usually only one observable actually changes.
**/
 
#include "RooChangeTracker.h"
#include "RooAbsReal.h"
#include "RooAbsCategory.h"
#include "RooArgSet.h"
 
 
////////////////////////////////////////////////////////////////////////////////
/// Constructor. The set trackSet contains the observables to be
/// tracked for changes. If checkValues is true an additional
/// validation step is activated where the numeric values of the
/// tracked arguments are compared with reference values ensuring
/// that values have actually changed.
 
RooChangeTracker::RooChangeTracker(const char* name, const char* title, const RooArgSet& trackSet, bool checkValues) :
  RooAbsReal(name, title),
  _realSet("realSet","Set of real-valued components to be tracked",this),
  _catSet("catSet","Set of discrete-valued components to be tracked",this),
  _realRef(trackSet.size()),
  _catRef(trackSet.size()),
  _checkVal(checkValues)
{
for (const auto arg : trackSet) {
    if (dynamic_cast<const RooAbsReal*>(arg)) {
      _realSet.add(*arg) ;
    }
    if (dynamic_cast<const RooAbsCategory*>(arg)) {
      _catSet.add(*arg) ;
    }
  }
 
  if (_checkVal) {
    for (unsigned int i=0; i < _realSet.size(); ++i) {
      auto real = static_cast<const RooAbsReal*>(_realSet.at(i));
      _realRef[i++] = real->getVal() ;
    }
 
    for (unsigned int i=0; i < _catSet.size(); ++i) {
      auto cat = static_cast<const RooAbsCategory*>(_catSet.at(i));
      _catRef[i++] = cat->getCurrentIndex() ;
    }
  }
 
}
 
 
 
////////////////////////////////////////////////////////////////////////////////
/// Copy constructor
 
RooChangeTracker::RooChangeTracker(const RooChangeTracker& other, const char* name) :
  RooAbsReal(other, name),
  _realSet("realSet",this,other._realSet),
  _catSet("catSet",this,other._catSet),
  _realRef(other._realRef),
  _catRef(other._catRef),
  _checkVal(other._checkVal)
{
}
 
 
 
////////////////////////////////////////////////////////////////////////////////
/// Returns true if state has changed since last call with clearState=true.
/// If clearState is true, changeState flag will be cleared.
 
bool RooChangeTracker::hasChanged(bool clearState)
{
 
  // If dirty flag did not change, object has not changed in any case
  if (!isValueDirty()) {
    return false ;
  }
 
  // If no value checking is required and dirty flag has changed, return true
  if (!_checkVal) {
 
    if (clearState) {
      // Clear dirty flag by calling getVal()
      clearValueDirty() ;
    }
 
    return true ;
  }
 
  // Compare values against reference
  if (clearState) {
 
    bool valuesChanged(false) ;
 
    // Check if any of the real values changed
    for (unsigned int i=0; i < _realSet.size(); ++i) {
      auto real = static_cast<const RooAbsReal*>(_realSet.at(i));
      if (real->getVal() != _realRef[i]) {
        valuesChanged = true ;
        _realRef[i] = real->getVal() ;
      }
    }
    // Check if any of the categories changed
    for (unsigned int i=0; i < _catSet.size(); ++i) {
      auto cat = static_cast<const RooAbsCategory*>(_catSet.at(i));
      if (cat->getCurrentIndex() != _catRef[i]) {
        valuesChanged = true ;
        _catRef[i] = cat->getCurrentIndex() ;
      }
    }
 
    clearValueDirty() ;
 
 
    if (!_init) {
      valuesChanged=true ;
      _init = true ;
    }
 
    return valuesChanged ;
 
  } else {
 
    // Return true as soon as any input has changed
 
    // Check if any of the real values changed
    for (unsigned int i=0; i < _realSet.size(); ++i) {
      auto real = static_cast<const RooAbsReal*>(_realSet.at(i));
      if (real->getVal() != _realRef[i]) {
        return true ;
      }
    }
    // Check if any of the categories changed
    for (unsigned int i=0; i < _catSet.size(); ++i) {
      auto cat = static_cast<const RooAbsCategory*>(_catSet.at(i));
      if (cat->getCurrentIndex() != _catRef[i]) {
        return true ;
      }
    }
 
  }
 
  return false ;
}
 
////////////////////////////////////////////////////////////////////////////////
 
RooArgSet RooChangeTracker::parameters() const
{
  RooArgSet ret ;
  ret.add(_realSet) ;
  ret.add(_catSet) ;
  return ret ;
}