ROOT_528-00b_version: include/TTreeResult.h Source File

00001 // @(#)root/tree:$Id: TTreeResult.h 20882 2007-11-19 11:31:26Z rdm $
00002 // Author: Fons Rademakers   30/11/99
00003 
00004 /*************************************************************************
00005  * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
00006  * All rights reserved.                                                  *
00007  *                                                                       *
00008  * For the licensing terms see $ROOTSYS/LICENSE.                         *
00009  * For the list of contributors see $ROOTSYS/README/CREDITS.             *
00010  *************************************************************************/
00011 
00012 #ifndef ROOT_TTreeResult
00013 #define ROOT_TTreeResult
00014 
00015 
00016 //////////////////////////////////////////////////////////////////////////
00017 //                                                                      //
00018 // TTreeResult                                                          //
00019 //                                                                      //
00020 // Class defining interface to a TTree query result with the same       //
00021 // interface as for SQL databases. A TTreeResult is returned by         //
00022 // TTree::Query() (actually TTreePlayer::Query()).                      //
00023 //                                                                      //
00024 // Related classes are TTreeRow.                                        //
00025 //                                                                      //
00026 //////////////////////////////////////////////////////////////////////////
00027 
00028 #ifndef ROOT_TSQLResult
00029 #include "TSQLResult.h"
00030 #endif
00031 
00032 class TString;
00033 class TObjArray;
00034 
00035 
00036 class TTreeResult : public TSQLResult {
00037 
00038 friend class TTreePlayer;
00039 
00040 private:
00041    Int_t       fColumnCount;   // number of columns in result
00042    TString    *fFields;        //[fColumnCount] array containing field strings
00043    TObjArray  *fResult;        // query result (TTreeRow objects)
00044    Int_t       fNextRow;       // row iterator
00045 
00046    Bool_t  IsValid(Int_t field);
00047    void    AddField(Int_t field, const char *fieldname);
00048    void    AddRow(TSQLRow *row);
00049 
00050 public:
00051    TTreeResult();
00052    TTreeResult(Int_t nfields);
00053    virtual ~TTreeResult();
00054 
00055    void        Close(Option_t *option="");
00056    Int_t       GetFieldCount();
00057    const char *GetFieldName(Int_t field);
00058    TObjArray  *GetRows() const {return fResult;}
00059    TSQLRow    *Next();
00060 
00061    ClassDef(TTreeResult,1)  // TTree query result
00062 };
00063 
00064 #endif