// @(#)root/star:$Name:  $:$Id: TDataSetIter.h,v 1.2 2003/01/27 20:41:36 brun Exp $
// Author: Valery Fine(fine@mail.cern.ch)   03/07/98

// ***********************************************************************
// * C++ class library to create and manipulate the datasets hierarchy
// * Copyright(c) 1997~2001  [BNL] Brookhaven National Laboratory
// * All rights reserved
// * Author                  Valery Fine  (fine.gov)
// * Copyright(c) 1997~2001  Valery Fine  (fine.gov)
// ***********************************************************************

#ifndef ROOT_TDataSetIter
#define ROOT_TDataSetIter


//////////////////////////////////////////////////////////////////////////
//                                                                      //
// $Id: TDataSetIter.h,v 1.2 2003/01/27 20:41:36 brun Exp $
//
// TDataSetIter                                                         //
//                                                                      //
// Iterator of TDataSet lists.                                          //
//                                                                      //
// Provides "standard" features of the TIter class for TDataSet object  //
//                             and                                      //
// allows navigating TDataSet structure using the custom "directory"    //
//    notation (see TDataSet::Find(const Char *path) method)            //
//                                                                      //
//////////////////////////////////////////////////////////////////////////

#include "TList.h"
#include "TNamed.h"

#include "TDataSet.h"

class TDataSetIter : public TObject{
protected:
   TIter           *fNext;            // "standard" ROOT iterator for containers
   TIter           *fNextSet[100];    // the list of the TList iterators to bypass the whole dataset
   Int_t            fDepth;           // the current depth of the passing
   Int_t            fMaxDepth;        // the max depth of the passing (=1 by default)

   TDataSet        *fDataSet;          // Pointer to the last selected TDataSet
   TDataSet        *fRootDataSet;      // Pointer to the root TDataSet
   TDataSet        *fWorkingDataSet;   // Pointer to the working TDataSet
   TDataSet        *NextDataSet(TIter &next);
   TDataSet        *NextDataSet(Int_t nDataSet);
   TDataSet        *GetNullSet();      // return a fake pointer == -1 casted to (TDataSet *)

   static TDataSet *fNullDataSet;
public:
  TDataSetIter(TDataSet *l=0, Int_t depth=1, Bool_t dir=kIterForward);
  TDataSetIter(TDataSet *l, Bool_t dir);
  virtual         ~TDataSetIter();

  virtual TDataSet    *Add(TDataSet *set){return Add(set,(TDataSet *)0);}
  virtual TDataSet    *Add(TDataSet *set, const Char_t *path);
  virtual TDataSet    *Add(TDataSet *set, TDataSet *dataset);

  virtual TDataSet    *Cd(const Char_t *dirname);
  virtual TDataSet    *Cd(TDataSet *ds);
  virtual TDataSet    *operator()( TDataSet::EDataSetPass mode=TDataSet::kContinue ) {return  Next(mode);}
  virtual TDataSet    *operator()(const Char_t *path) { return Find(path); }
  virtual TDataSet    *operator[](const Char_t *path);
  virtual Int_t        GetDepth() const {return fDepth;}
  virtual TDataSet    *Cwd() const {return fWorkingDataSet;}
  virtual TDataSet    *Dir(Char_t *dirname);
  virtual Int_t        Du() const;            // summarize dataset usage
  virtual Int_t        Df() const {return 0;} // report number of free "table" blocks.

  virtual TDataSet    *Find(const Char_t *path, TDataSet *rootset=0,Bool_t mkdir=kFALSE,Bool_t titleFlag=kFALSE);
  virtual TDataSet    *FindByPath(const Char_t *path, TDataSet *rootset=0,Bool_t mkdir=kFALSE);
  virtual TDataSet    *FindDataSet(const Char_t *name,const Char_t *path="",Option_t *opt="");
  virtual TDataSet    *FindByName(const Char_t *name,const Char_t *path="",Option_t *opt="");
  virtual TDataSet    *FindByTitle(const Char_t *title,const Char_t *path="",Option_t *opt="");
  virtual TDataSet    *FindDataSet(TDataSet *set,const Char_t *path,Option_t *opt="");
  virtual TDataSet    *FindByPointer(TDataSet *set,const Char_t *path=0,Option_t *opt="");
  virtual TObject     *FindObject(const Char_t *name) const;
  virtual TObject     *FindObject(const TObject *obj) const;

  virtual Int_t        Flag(UInt_t flag=TDataSet::kMark,TDataSet::EBitOpt reset=TDataSet::kSet){return Flag((TDataSet *)0,flag,reset);}
  virtual Int_t        Flag(const Char_t *path,UInt_t flag=TDataSet::kMark,TDataSet::EBitOpt reset=TDataSet::kSet);
  virtual Int_t        Flag(TDataSet *dataset,UInt_t flag=TDataSet::kMark,TDataSet::EBitOpt reset=TDataSet::kSet);

  virtual TDataSet    *Ls(const Char_t *dirname="",Option_t *opt="") const;
  virtual TDataSet    *Ls(const Char_t *dirname,Int_t depth) const;
  virtual void         ls(Option_t *dirname="") const { Ls(dirname,"");}
  virtual TDataSet    *ls(TString dirname,Option_t *opt="") const  {return Ls(dirname.Data(),opt);}
  virtual TDataSet    *ls(const Char_t *dirname,Int_t depth) const {return Ls(dirname,depth);}
  virtual TDataSet    *Mkdir(const Char_t *dirname);
  virtual TDataSet    *Md(const Char_t *dirname)                       {return Mkdir(dirname);}
  virtual TString      Path(const Char_t *path)                        {TDataSet *set = Find(path); return set ? TString (""):set->Path();}
  virtual TString      Path() {return fWorkingDataSet ? TString ("") : fWorkingDataSet->Path();}
  virtual TDataSet    *Pwd(Option_t *opt="") const                     {if (Cwd()) Cwd()->ls(opt); return Cwd();}
  virtual TDataSet    *Rmdir(TDataSet *dataset,Option_t *option="");
  virtual TDataSet    *Rmdir(const Char_t *dirname,Option_t *option=""){return Rmdir(Find(dirname),option);}
  virtual TDataSet    *Rd(const Char_t *dirname,Option_t *option="")   {return Rmdir(Find(dirname),option);}

  virtual TDataSet    *Shunt(TDataSet *set){return Shunt(set,(TDataSet *)0);}
  virtual TDataSet    *Shunt(TDataSet *set, const Char_t *path);
  virtual TDataSet    *Shunt(TDataSet *set, TDataSet *dataset);

  virtual TDataSet    *Next( TDataSet::EDataSetPass mode=TDataSet::kContinue);
  virtual TDataSet    *Next(const Char_t *path, TDataSet *rootset=0,Bool_t mkdir=kFALSE){return Find(path,rootset,mkdir);}
  virtual Bool_t      Notify() { return TObject::Notify();}
  virtual void         Notify(TDataSet *dataset);
   const  Option_t    *GetOption() const                                { return fNext ? fNext->GetOption():0; }
  virtual void         Reset(TDataSet *l=0,Int_t depth=0);
  virtual TDataSet    *operator *() const ;
  ClassDef(TDataSetIter,0) // class-iterator to navigate TDataSet structure
};

inline TDataSet *TDataSetIter::operator *() const { return fDataSet == fNullDataSet ? fWorkingDataSet : fDataSet; }
inline TDataSet *TDataSetIter::GetNullSet() { return (TDataSet *)fNullDataSet; } // return a fake pointer == -1 casted to (TDataSet *)
#endif