// Copyright (c) 2017 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

#ifndef _StdObjMgt_WriteData_HeaderFile
#define _StdObjMgt_WriteData_HeaderFile

#include <Standard.hxx>
#include <Storage_BaseDriver.hxx>

class StdObjMgt_Persistent;
class Standard_GUID;

//! Auxiliary data used to write persistent objects to a file.
class StdObjMgt_WriteData
{
public:

  class Object;

  Standard_EXPORT StdObjMgt_WriteData 
    (Storage_BaseDriver& theDriver);

  Standard_EXPORT void WritePersistentObject
    (const Handle(StdObjMgt_Persistent)& thePersistent);

  template <class Persistent>
  StdObjMgt_WriteData& operator << (const Handle(Persistent)& thePersistent)
  {
    *myDriver << (thePersistent ? thePersistent->RefNum() : 0);
    return *this;
  }

  Standard_EXPORT StdObjMgt_WriteData& operator << (const Handle(StdObjMgt_Persistent)& thePersistent);

  template <class Type>
  StdObjMgt_WriteData& WriteValue(const Type& theValue)
  {
    *myDriver << theValue;
    return *this;
  }

  StdObjMgt_WriteData& operator << (const Standard_Character& theValue)
    { return WriteValue(theValue); }
  
  StdObjMgt_WriteData& operator << (const Standard_ExtCharacter& theValue)
    { return WriteValue(theValue); }
  
  StdObjMgt_WriteData& operator << (const Standard_Integer& theValue)
   { return WriteValue(theValue); }
  
  StdObjMgt_WriteData& operator << (const Standard_Boolean& theValue)
    { return WriteValue(theValue); }
  
  StdObjMgt_WriteData& operator << (const Standard_Real& theValue)
   { return WriteValue(theValue); }
  
  StdObjMgt_WriteData& operator << (const Standard_ShortReal& theValue)
    { return WriteValue(theValue); }

private:
  Storage_BaseDriver* myDriver;
};

class StdObjMgt_WriteData::Object
{
public:
  Object (StdObjMgt_WriteData& theData) : myWriteData(&theData)
    { myWriteData->myDriver->BeginWriteObjectData(); }
  Object (const StdObjMgt_WriteData::Object& theOther) : myWriteData(theOther.myWriteData)
    { myWriteData->myDriver->BeginWriteObjectData(); }

  ~Object()
    { myWriteData->myDriver->EndWriteObjectData(); }

  operator StdObjMgt_WriteData& ()
    { return *myWriteData; }

  template <class Data>
  StdObjMgt_WriteData& operator << (Data& theData)
    { return *myWriteData << theData; }

private:
  StdObjMgt_WriteData* myWriteData;

  StdObjMgt_WriteData::Object& operator = (const StdObjMgt_WriteData::Object&);
};

Standard_EXPORT StdObjMgt_WriteData& operator <<
  (StdObjMgt_WriteData::Object theWriteData, const Standard_GUID& theGUID);

#endif // _StdObjMgt_WriteData_HeaderFile