0026961: Recover possibility to read files in old persistence format -- preparation

[occt.git] / src / StdObjMgt / StdObjMgt_ReadData.cxx

diff --git a/src/StdObjMgt/StdObjMgt_ReadData.cxx b/src/StdObjMgt/StdObjMgt_ReadData.cxx
new file mode 100644 (file)
index 0000000..c663600
--- /dev/null
+++ b/src/StdObjMgt/StdObjMgt_ReadData.cxx
@@ -0,0 +1,31 @@
+// Copyright (c) 2015 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.
+
+#include <StdObjMgt_ReadData.hxx>
+
+
+StdObjMgt_ReadData::StdObjMgt_ReadData (Storage_BaseDriver&    theDriver,
+                                        const Standard_Integer theNumberOfObjects)
+  : myDriver (&theDriver)
+  , myPersistentObjects (1, theNumberOfObjects) {}
+
+void StdObjMgt_ReadData::ReadReference (Handle(StdObjMgt_Persistent)& theTarget)
+{
+  Standard_Integer aRef;
+  myDriver->GetReference (aRef);
+
+  if (aRef)
+    theTarget = Object (aRef);
+  else
+    theTarget.Nullify();
+}