// @(#)root/star:$Name:  $:$Id: TTableDescriptor.h,v 1.6 2005/09/09 04:57:59 brun Exp $
// Author: Valery Fine   09/08/99  (E-mail: fine@bnl.gov)

/*************************************************************************
 * 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_TTableDescriptor
#define ROOT_TTableDescriptor

#include "TClass.h"
#include "TTable.h"
#include "tableDescriptor.h"

class TTableDescriptor : public TTable {
  protected:
     friend class TTable;
     TClass  *fRowClass;                  // TClass defining 
                                          // the table row C-structure
     TTableDescriptor *fSecondDescriptor; // shadow descriptor 
                                          // to back TTable::Streamer
     static TString fgCommentsName;        // The name of dataset to keep the comments fields
     virtual void Init(TClass *classPtr);
     static void SetCommentsSetName(const char *name=".comments");

  public:

    TTableDescriptor(const TTable *parentTable);
    TTableDescriptor(TClass *classPtr);
    TTableDescriptor(const TTableDescriptor &dsc):TTable(dsc),fRowClass(dsc.fRowClass),fSecondDescriptor(0){}
   ~TTableDescriptor();
    virtual     Int_t      AddAt(const void *c);
    virtual     void       AddAt(const void *c, Int_t i);
    virtual     void       AddAt(const tableDescriptor_st &element, const char *comment,Int_t indx);
    virtual     void       AddAt(TDataSet *dataset,Int_t idx=0);
    TString CreateLeafList() const;
             void        LearnTable(const TTable *parentTable);
             void        LearnTable(TClass *classPtr);
             const Char_t *ColumnName(Int_t columnIndex)        const;
             Int_t     ColumnByName(const Char_t *columnName=0) const;
             UInt_t      NumberOfColumns()                      const;
             const UInt_t *IndexArray(Int_t columnIndex)        const;
             UInt_t      Offset(Int_t columnIndex)              const;
             Int_t       Offset(const Char_t *columnName=0)     const;
             UInt_t      ColumnSize(Int_t columnIndex)          const;
             Int_t       ColumnSize(const Char_t *columnName=0) const;
             UInt_t      TypeSize(Int_t columnIndex)            const;
             Int_t       TypeSize(const Char_t *columnName=0)   const;
             UInt_t      Dimensions(Int_t columnIndex)          const;
             Int_t       Dimensions(const Char_t *columnName=0) const;
             TTable::EColumnType ColumnType(Int_t columnIndex)          const;
             TTable::EColumnType ColumnType(const Char_t *columnName=0) const;
             TClass     *RowClass() const;
             void        SetOffset(UInt_t offset,Int_t column);
             void        SetSize(UInt_t size,Int_t column);
             void        SetTypeSize(UInt_t size,Int_t column);
             void        SetDimensions(UInt_t dim,Int_t column);
             Int_t       Sizeof() const;
             void        SetColumnType(TTable::EColumnType type,Int_t column);
    virtual  Int_t       UpdateOffsets(const TTableDescriptor *newDesciptor);

    static   TTableDescriptor *MakeDescriptor(const char *structName);
    TDataSet *MakeCommentField(Bool_t createFlag=kTRUE);

//    ClassDefTable(TTableDescriptor,tableDescriptor_st)
  protected:                                        
     static  TTableDescriptor *fgColDescriptors;     
     virtual TTableDescriptor *GetDescriptorPointer() const     { return fgColDescriptors;}                 
     virtual void SetDescriptorPointer(TTableDescriptor *list)  { fgColDescriptors = list;}                  
  public:                                           
    typedef tableDescriptor_st* iterator;                   
    TTableDescriptor() : TTable("TTableDescriptor",sizeof(tableDescriptor_st)), fRowClass(0), fSecondDescriptor(0) {SetType("tableDescriptor_st");}      
    TTableDescriptor(const Text_t *name) : TTable(name,sizeof(tableDescriptor_st)), fRowClass(0), fSecondDescriptor(0) {SetType("tableDescriptor_st");}     
    TTableDescriptor(Int_t n) : TTable("TTableDescriptor",n,sizeof(tableDescriptor_st)), fRowClass(0), fSecondDescriptor(0) {SetType("tableDescriptor_st");}
    TTableDescriptor(const Text_t *name,Int_t n) : TTable(name,n,sizeof(tableDescriptor_st)), fRowClass(0), fSecondDescriptor(0) {SetType("tableDescriptor_st");}
    tableDescriptor_st *GetTable(Int_t i=0) const { return ((tableDescriptor_st *)GetArray())+i;}                       
    tableDescriptor_st &operator[](Int_t i){ assert(i>=0 && i < GetNRows()); return *GetTable(i); }             
    const tableDescriptor_st &operator[](Int_t i) const { assert(i>=0 && i < GetNRows()); return *((const tableDescriptor_st *)(GetTable(i))); } 
    tableDescriptor_st *begin() const  {                      return GetNRows()? GetTable(0):0;}
    tableDescriptor_st *end()   const  {Long_t i = GetNRows(); return          i? GetTable(i):0;}
    static const char *TableDictionary();
    ClassDef(TTableDescriptor,0) // descrpitor defining the internal layout of TTable objects
};

//______________________________________________________________________________
// inline  TTableDescriptor(const TTableDescriptor &dsc) : TTable(dsc), fRowClass(dsc.fRowClass),fSecondDescriptor(0){}
 inline  const Char_t *TTableDescriptor::ColumnName(Int_t column)const {return ((tableDescriptor_st *)At(column))->fColumnName;}
inline  UInt_t  TTableDescriptor::Offset(Int_t column)          const {return ((tableDescriptor_st *)At(column))->fOffset;    }
 inline  const UInt_t *TTableDescriptor::IndexArray(Int_t column)const {return ((tableDescriptor_st *)At(column))->fIndexArray;}
inline  UInt_t  TTableDescriptor::NumberOfColumns()             const {return  GetNRows();                                      }
inline  UInt_t  TTableDescriptor::ColumnSize(Int_t column)      const {return ((tableDescriptor_st *)At(column))->fSize;      }
inline  UInt_t  TTableDescriptor::TypeSize(Int_t column)        const {return ((tableDescriptor_st *)At(column))->fTypeSize;  }
inline  UInt_t  TTableDescriptor::Dimensions(Int_t column)      const {return ((tableDescriptor_st *)At(column))->fDimensions;}
inline  TTable::EColumnType TTableDescriptor::ColumnType(Int_t column) const {return EColumnType(((tableDescriptor_st *)At(column))->fType);}
inline  TClass *TTableDescriptor::RowClass() const { return fRowClass;}
inline  void    TTableDescriptor::SetOffset(UInt_t offset,Int_t column)  {((tableDescriptor_st *)At(column))->fOffset     = offset;}
inline  void    TTableDescriptor::SetSize(UInt_t size,Int_t column)      {((tableDescriptor_st *)At(column))->fSize       = size;  }
inline  void    TTableDescriptor::SetTypeSize(UInt_t size,Int_t column)  {((tableDescriptor_st *)At(column))->fTypeSize   = size;  }
inline  void    TTableDescriptor::SetDimensions(UInt_t dim,Int_t column) {((tableDescriptor_st *)At(column))->fDimensions = dim;   }
inline  void    TTableDescriptor::SetColumnType(TTable::EColumnType type,Int_t column) {((tableDescriptor_st *)At(column))->fType = type;  }
inline  void    TTableDescriptor::SetCommentsSetName(const char *name){fgCommentsName =  name;}

#endif