/////////////////////////////////////////////////////////////////////////////// 
// Copyright (C) 2003-2012, Open Design Alliance (the "Alliance"). 
// All rights reserved. 
// 
// This software and its documentation and related materials are owned by 
// the Alliance. The software may only be incorporated into application 
// programs owned by members of the Alliance, subject to a signed 
// Membership Agreement and Supplemental Software License Agreement with the
// Alliance. The structure and organization of this software are the valuable  
// trade secrets of the Alliance and its suppliers. The software is also 
// protected by copyright law and international treaty provisions. Application  
// programs incorporating this software must include the following statement 
// with their copyright notices:
//   
//   This application incorporates Teigha(R) software pursuant to a license 
//   agreement with Open Design Alliance.
//   Teigha(R) Copyright (C) 2003-2012 by Open Design Alliance. 
//   All rights reserved.
//
// By use of this software, its documentation or related materials, you 
// acknowledge and accept the above terms.
///////////////////////////////////////////////////////////////////////////////

#ifndef _EX_DBPAGECONTROLLER_H_
#define _EX_DBPAGECONTROLLER_H_

#include "TD_PackPush.h"
#include "DbPageController.h"
#include "OdBinaryData.h"

/** Description:
  This PageController class implements unloading of objects in partially opened database.
  {group:ExServices_Classes} Library: Source *code* provided. 
*/
class ExUnloadController : public OdDbPageController
{
public:
  ExUnloadController();

  int pagingType() const;
  OdStreamBufPtr read(Key key);
  bool write(Key& key, OdStreamBuf* pStreamBuf);
  void setDatabase(OdDbDatabase* pDb);
  OdDbDatabase* database();

private:
  OdDbDatabase* m_pDb;
};

/** Description:
   This class implements unloading and paging to external storage.
   Remarks:
   This class contains a very simple implementation of paging, with consecutive writing in a file.
  {group:ExServices_Classes} Library: Source *code* provided. 
*/
class ExPageController : public ExUnloadController
{
public:
  ExPageController();
  ~ExPageController();

  int pagingType() const;
  OdStreamBufPtr read(Key key);
  bool write(Key& key, OdStreamBuf* pStreamBuf);
  void setDatabase(OdDbDatabase* pDb);

private:
  FILE*         m_fp;
  OdAnsiString  m_fname;
  OdBinaryData  m_buffTmp;
};
#include "TD_PackPop.h"

#endif // _EX_DBPAGECONTROLLER_H_
