// -*- mode: c++ -*-
//
// $Id: BrEventIO.h,v 1.3 2001/08/21 16:05:38 cholm Exp $
//
//
///////////////////////////////////////////////////////////////////////
//                                                                   //
//                                                                   //
//    Author  : K. Hagel                                             //
//    Created : July 98                                              //
//    Version : 1.0                                                  //
//    Changed :                                                      //
//                                                                   //
///////////////////////////////////////////////////////////////////////
#ifndef BRAT_BrEventIO  
#define BRAT_BrEventIO
#ifndef WIN32
#include <cstdio>
#else 
#include <stdio.h>
#endif
#ifndef ROOT_TObject
#include "TObject.h"
#endif
#ifndef ROOT_TFile
#include "TFile.h"
#endif
#ifndef ROOT_TTree
#include "TTree.h"
#endif
#ifndef ROOT_TKey
#include "TKey.h"
#endif
#ifndef ROOT_TBrowser
#include "TBrowser.h"
#endif
#ifndef BRAT_BrIOModule
#include "BrIOModule.h"
#endif
#ifndef BRAT_BrDataTable
#include "BrDataTable.h"
#endif
#ifndef BRAT_BrFileTag
#include "BrFileTag.h"
#endif

#define MaxNumEventBranches 50

class BrEventIO : public BrIOModule 
{
private:
  Bool_t          InitializeRootSerialFile(); 
  Bool_t          InitializeRootTreeFile();   
  void            ProcessRootSerialFile(BrEvent *event);
  void            ProcessRootTreeFile(BrEvent *event);	

  TFile*          fROOTFile;	        //TFile object
  TString         fFileOption;	        //Regular TFile option parameter
  BrFileTag::EFileMode fFileMode;       // File mode
  BrFileTag*      fTag;                 // File tag. 
  TList*          fListOfKeys;	        //List of Keys in serial file
  TIter*          fNextKey;	        //!Key to next event in serial file
  TTree*          fTree;                //Tree to write out
  TBranch*        fBranch[MaxNumEventBranches];	//Branch for that tree
  Int_t           fBufsize;             //Buffer size for tree
  Int_t           fSplit;               //Split mode?
  // Int_t        fNumBytesWritten;	//Number of bytes written
  // Int_t        fNumBytesRead;	//Number of bytes read
  Bool_t          fCreateBranch;	//To decide if to create branch or not
  Int_t           fNumBranches;		//Number of branches in the Tree
  Int_t           fNumEntries;		//Number of entries in tree;
  Int_t           fEventNumber;		//Event number we are on.
  Bool_t          fWriteFile;		//Specifies read or write mode
  Bool_t          fTopLevel;            //!Test for level nesting in browser

public:
  BrEventIO(); 
  BrEventIO(const Char_t *name, const Char_t* title=0);
  virtual ~BrEventIO(); 
  
  virtual Bool_t  Open(const Char_t *fname,const Option_t *option);
  virtual Bool_t  Close();
  virtual void    Event(BrEvent* event);
  virtual Bool_t  SkipEvent(Int_t numevt);

  virtual BrFileTag::EFileMode GetFileMode() const { return fFileMode; }
  virtual void                 SetFileMode(BrFileTag::EFileMode mode);  
  virtual void    SetTreeParameters(Int_t bufSize=32000, Int_t split=99);
  virtual TFile*  GetROOTFile(void) { return fROOTFile; }

  virtual Bool_t  IsFolder(void) const { return kTRUE; }
  virtual void    Browse(TBrowser* b);
  virtual void    Print(Option_t* option="") const;

  friend ostream& operator<< (ostream& os,BrEventIO* digio_p);
  friend ostream& operator<< (ostream& os,BrEventIO& digio_p);

  ClassDef(BrEventIO, 0) // Read/write GBRAHMS Event data in ROOT format  
};

#endif




// $Log: BrEventIO.h,v $
// Revision 1.3  2001/08/21 16:05:38  cholm
// Added a method to set the buffer size and split level on the TTrees.
// It turned out, that with the default setting (64000, 1), we (@ nbi)
// got serious problems reading back files.  An investigation gave:
//
//                  buffer
//    split   100   2000   4000   6400   16000   32000
//      0     n/a    n/a     ok    bad     n/a     n/a
//      2      ok    n/a    n/a    ok       ok      ok
//     99      ok    n/a    n/a    ok       ok      ok
//
// n/a means I was lazy and didn't do the test.  I've set the default to
// 32000/1.  See also the ROOT Users Guide chapter 12.
//
// Revision 1.2  2001/06/22 11:20:07  cholm
// Set version number to 0, since this class should not be persistent
//
// Revision 1.1.1.1  2001/06/21 14:55:07  hagel
// Initial revision of brat2
//
// Revision 1.11  2001/06/04 13:35:46  cholm
// Changes to use BrPathManager, BrVersion, and perpare to use BrFileTag.
//
// Revision 1.10  2001/03/07 12:15:22  cholm
// * Defined standard BrModule methods in BrIOModule.
// * Add the (simple) class BrHistIOModule.
// * BrAppOptionManager and BrAppOption classes changed to not use
//   BrExceptions.
// * Added the method Int_t BrMainModule::Main() to do EVERYTHING.
// * Made the method BrModule::Info() const obsolete in favour of
//   BrModule::Print(Option_t* option="B") const. Impact on other classes.
//
// Revision 1.9  2000/10/03 19:29:46  cholm
// Made IsFolder() const (since it is in TObject) which was needed for the
// objects to be browsable. Aslo, as of ROOT version 2.25.02 there's a list
// of special objects, which BrEventIO now is added to. Some doc to
// BrEventNode::Clear() added! Added method BrEventNode::SetOwner().
// 						Christian Holm
//
// Revision 1.8  2000/06/28 09:03:00  hagel
// Added const to various char's in BrEventIO + BrIOMOdule
//
// Revision 1.7  2000/06/03 18:17:03  videbaek
// Changed inheritance of BrIOModule. Added utility to BrDataObject.. See Update message for more info
//
// Revision 1.6  2000/04/14 21:59:54  cholm
// Revisited build system completly. See brahms-dev-l archive
// for more information
//
// Revision 1.5  2000/04/13 00:01:58  cholm
// Added methods for browsing BrEvents, either directly or via
// a BrEventIO. Also added method GetROOTFile to BrEventIO.
//
// Revision 1.4  1999/10/22 18:32:53  videbaek
// Added code for getting bytes read written properly.
// Now all in base Class BrIOModule
//
// Revision 1.3  1999/01/21 23:23:19  hagel
// 1. Changed convention for checking includes.  Current convention is:
//    BRAT_Br...... eg BRAT_BrModule ala ROOT.
// 2. Added CVS logs to .h files that didn't have them.
// 3. Moved checking of include definition to first line for easier reading
// 4. Put checks before all includes in the include files as per BRAT specifications
// 5. Added BrGeantHeader to Geant Makefile
// 6. All changes have been checked to compile on NT ala Cygnus
//
// Revision 1.2  1998/09/28 21:03:03  videbaek
// Added cvs log id
//