/*++

Copyright (c) 2000  Microsoft Corporation

Module Name:

    schemaextensions.h

Abstract:

    This file contains the definition of the CSchemaExtensions class.
    This is the only class that talks to the catalog.

Author:

    MarcelV

Revision History:

    Mohit Srivastava            28-Nov-00

--*/

#ifndef _schemaextensions_h_
#define _schemaextensions_h_

#include "catalog.h"
#include "catmeta.h"
#include <atlbase.h>

//forward decl
struct CTableMeta;

struct CColumnMeta
{
    CColumnMeta() {paTags = 0; cbDefaultValue = 0; cNrTags = 0;}
    ~CColumnMeta() {delete [] paTags;}
    tCOLUMNMETARow ColumnMeta;
    ULONG cbDefaultValue;
    ULONG cNrTags;
    tTAGMETARow **paTags;
};

struct CTableMeta
{
    CTableMeta () {paColumns=0;}
    ~CTableMeta () {delete []paColumns;}

    ULONG ColCount () const
    {
        return *(TableMeta.pCountOfColumns);
    }

    tTABLEMETARow TableMeta;
    CColumnMeta **paColumns;
};



typedef tTAGMETARow * LPtTAGMETA;
typedef CColumnMeta * LPCColumnMeta;
    

class CSchemaExtensions
{
public:
    CSchemaExtensions ();
    ~CSchemaExtensions ();
    
    HRESULT Initialize (bool i_bUseExtensions = true);
    CTableMeta* EnumTables(ULONG *io_idx);

    HRESULT GetMbSchemaTimeStamp(FILETIME* io_pFileTime) const;

private:

    HRESULT GenerateIt ();

    HRESULT GetTables ();
    HRESULT GetColumns ();
    HRESULT GetTags ();
    HRESULT GetRelations ();    
    
    HRESULT BuildInternalStructures ();

    CComPtr<ISimpleTableDispenser2>  m_spDispenser;
    CComPtr<IMetabaseSchemaCompiler> m_spIMbSchemaComp;

    CComPtr<ISimpleTableRead2> m_spISTTableMeta;
    CComPtr<ISimpleTableRead2> m_spISTColumnMeta;
    CComPtr<ISimpleTableRead2> m_spISTTagMeta;
    CComPtr<ISimpleTableRead2> m_spISTRelationMeta;
    
    LPWSTR              m_wszBinFileName;
    
    LPTSTR              m_tszBinFilePath;

    CTableMeta*         m_paTableMetas;     // all table information
    ULONG               m_cNrTables;

    CColumnMeta*        m_paColumnMetas;    // all column information
    ULONG               m_cNrColumns;

    tTAGMETARow*        m_paTags;           // all tag information
    ULONG               m_cNrTags;

    ULONG               m_cQueryCells;
    STQueryCell*        m_pQueryCells;

    bool                m_bBinFileLoaded;
};

#endif // _schemaextensions_h_