0029422: OCAF, old persistence - wrong implementation of writing a reference

[occt.git] / src / StdObjMgt / StdObjMgt_WriteData.hxx

// 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:

  //! Auxiliary class used to automate begin and end of
  //! writing object (adding opening and closing parenthesis)
  //! at constructor and destructor
  class ObjectSentry
  {
  public:
    explicit ObjectSentry (StdObjMgt_WriteData& theData) : myWriteData(&theData)
    { myWriteData->myDriver->BeginWriteObjectData(); }

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

  private:
    StdObjMgt_WriteData* myWriteData;

    ObjectSentry (const ObjectSentry&);
    ObjectSentry& operator = (const ObjectSentry&);
  };

  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->PutReference(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;
};

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

#endif // _StdObjMgt_WriteData_HeaderFile