TTreeResult.h

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// @(#)root/tree:$Id$
// Author: Fons Rademakers   30/11/99
 
/*************************************************************************
 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#ifndef ROOT_TTreeResult
#define ROOT_TTreeResult
 
 
//////////////////////////////////////////////////////////////////////////
//                                                                      //
// TTreeResult                                                          //
//                                                                      //
// Class defining interface to a TTree query result with the same       //
// interface as for SQL databases. A TTreeResult is returned by         //
// TTree::Query() (actually TTreePlayer::Query()).                      //
//                                                                      //
// Related classes are TTreeRow.                                        //
//                                                                      //
//////////////////////////////////////////////////////////////////////////
 
#include "TSQLResult.h"
 
class TString;
class TObjArray;
 
 
class TTreeResult : public TSQLResult {
 
friend class TTreePlayer;
 
private:
   Int_t       fColumnCount;   ///< number of columns in result
   TString    *fFields;        ///<[fColumnCount] array containing field strings
   TObjArray  *fResult;        ///< query result (TTreeRow objects)
   Int_t       fNextRow;       ///< row iterator
 
   Bool_t  IsValid(Int_t field);
   void    AddField(Int_t field, const char *fieldname);
   void    AddRow(TSQLRow *row);
 
public:
   TTreeResult();
   TTreeResult(Int_t nfields);
   virtual ~TTreeResult();
 
   void        Close(Option_t *option="");
   Int_t       GetFieldCount();
   const char *GetFieldName(Int_t field);
   TObjArray  *GetRows() const {return fResult;}
   TSQLRow    *Next();
 
   ClassDef(TTreeResult,1)  // TTree query result
};
 
#endif