include/opencascade/BinMDF_DerivedDriver.hxx

0001 // Copyright (c) 2020 OPEN CASCADE SAS
0002 //
0003 // This file is part of Open CASCADE Technology software library.
0004 //
0005 // This library is free software; you can redistribute it and/or modify it under
0006 // the terms of the GNU Lesser General Public License version 2.1 as published
0007 // by the Free Software Foundation, with special exception defined in the file
0008 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
0009 // distribution for complete text of the license and disclaimer of any warranty.
0010 //
0011 // Alternatively, this file may be used under the terms of Open CASCADE
0012 // commercial license or contractual agreement.
0013
0014 #ifndef _BinMDF_DerivedDriver_HeaderFile
0015 #define _BinMDF_DerivedDriver_HeaderFile
0016
0017 #include <BinMDF_ADriver.hxx>
0018
0019 //! A universal driver for the attribute that inherits another attribute with
0020 //! ready to used persistence mechanism implemented (already has a driver to store/retrieve).
0021 class BinMDF_DerivedDriver : public BinMDF_ADriver
0022 {
0023   DEFINE_STANDARD_RTTIEXT(BinMDF_DerivedDriver, BinMDF_ADriver)
0024 public:
0025
0026   //! Creates a derivative persistence driver for theDerivative attribute by reusage of theBaseDriver
0027   //! @param theDerivative an instance of the attribute, just created, detached from any label
0028   //! @param theBaseDriver a driver of the base attribute, called by Paste methods
0029   BinMDF_DerivedDriver (const Handle(TDF_Attribute)& theDerivative,
0030                         const Handle(BinMDF_ADriver)& theBaseDriver)
0031   : BinMDF_ADriver(theBaseDriver->MessageDriver()), myDerivative(theDerivative), myBaseDirver(theBaseDriver) {}
0032
0033   //! Creates a new instance of the derivative attribute
0034   virtual Handle(TDF_Attribute) NewEmpty() const Standard_OVERRIDE { return myDerivative->NewEmpty(); }
0035
0036   //! Reuses the base driver to read the base fields
0037   virtual Standard_Boolean Paste (const BinObjMgt_Persistent& theSource,
0038                                   const Handle(TDF_Attribute)& theTarget,
0039                                   BinObjMgt_RRelocationTable& theRelocTable) const Standard_OVERRIDE
0040   {
0041     Standard_Boolean aResult = myBaseDirver->Paste (theSource, theTarget, theRelocTable);
0042     theTarget->AfterRetrieval(); // to allow synchronization of the derived attribute with the base content
0043     return aResult;
0044   }
0045
0046   //! Reuses the base driver to store the base fields
0047   virtual void Paste (const Handle(TDF_Attribute)& theSource,
0048                       BinObjMgt_Persistent& theTarget,
0049                       BinObjMgt_SRelocationTable& theRelocTable) const Standard_OVERRIDE
0050   {
0051     myBaseDirver->Paste(theSource, theTarget, theRelocTable);
0052   }
0053
0054 protected:
0055   Handle(TDF_Attribute)  myDerivative; //!< the derivative attribute that inherits the base
0056   Handle(BinMDF_ADriver) myBaseDirver; //!< the base attribute driver to be reused here
0057 };
0058
0059 #endif