RooDirItem.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 RooDirItem.cxx
\class RooDirItem
\ingroup Roofitcore

RooDirItem is a utility base class for RooFit objects that are to be attached
to ROOT directories. Concrete classes inherit the appendToDir and removeToDir
methods that can be used to safely attach and detach one self from a TDirectory
**/

#include "RooFit.h"

#include "Riostream.h"
#include "Riostream.h"
#include "TROOT.h"
#include "TList.h"
#include "TDirectoryFile.h"
#include "TString.h"
#include "RooDirItem.h"

using namespace std;

ClassImp(RooDirItem) ;


////////////////////////////////////////////////////////////////////////////////
/// Default constructor

RooDirItem::RooDirItem() : _dir(0) 
{
}


////////////////////////////////////////////////////////////////////////////////
/// Copy constructor

RooDirItem::RooDirItem(const RooDirItem& /*other*/) : _dir(0) 
{
}



////////////////////////////////////////////////////////////////////////////////
/// Destructor

RooDirItem::~RooDirItem() 
{  
}



////////////////////////////////////////////////////////////////////////////////
/// Remove object from directory it was added to

void RooDirItem::removeFromDir(TObject* obj) 
{
  if (_dir) {
    if (!_dir->TestBit(TDirectoryFile::kCloseDirectory))
      _dir->GetList()->Remove(obj) ;
  }
} 



////////////////////////////////////////////////////////////////////////////////
/// Append object to directory. If forceMemoryResident is
/// true, force addition to ROOT memory directory if that
/// is not the current directory

void RooDirItem::appendToDir(TObject* obj, Bool_t forceMemoryResident) 
{
  if (forceMemoryResident) {
    // Append self forcibly to memory directory

    TString pwd(gDirectory->GetPath()) ;
    TString memDir(gROOT->GetName()) ;
    memDir.Append(":/") ;
    Bool_t notInMemNow= (pwd!=memDir) ;

    //cout << "RooDirItem::appendToDir pwd=" << pwd << " memDir=" << memDir << endl ;

    if (notInMemNow) { 
      gDirectory->cd(memDir) ;
    }

    _dir = gDirectory ;
    gDirectory->Append(obj) ;
    
    if (notInMemNow) {
      gDirectory->cd(pwd) ;    
    }

  } else {
    // Append self to present gDirectory
    _dir = gDirectory ;
    gDirectory->Append(obj) ;
  }
}