// File:	MDataStd_TreeNodeStorageDriver.cxx
// Created:	Thu Jun 17 11:58:51 1999
// Author:	Vladislav ROMASHKO
//		<vro@flox.nnov.matra-dtv.fr>


#include <MDataStd_TreeNodeStorageDriver.ixx>

#include <TDataStd_TreeNode.hxx>
#include <PDataStd_TreeNode.hxx>
#include <Standard_NoSuchObject.hxx>
#include <CDM_MessageDriver.hxx>

MDataStd_TreeNodeStorageDriver::MDataStd_TreeNodeStorageDriver(const Handle(CDM_MessageDriver)& theMsgDriver):MDF_ASDriver(theMsgDriver)
{}

Standard_Integer MDataStd_TreeNodeStorageDriver::VersionNumber() const
{ return 0; }

Handle(Standard_Type) MDataStd_TreeNodeStorageDriver::SourceType() const
{ return STANDARD_TYPE(TDataStd_TreeNode); }

Handle(PDF_Attribute) MDataStd_TreeNodeStorageDriver::NewEmpty() const
{ return new PDataStd_TreeNode(); }

void MDataStd_TreeNodeStorageDriver::Paste(const Handle(TDF_Attribute)&        Source,
					    const Handle(PDF_Attribute)&        Target,
					    const Handle(MDF_SRelocationTable)& RelocTable) const
{
  Handle(TDataStd_TreeNode) S = Handle(TDataStd_TreeNode)::DownCast (Source);
  Handle(PDataStd_TreeNode) T = Handle(PDataStd_TreeNode)::DownCast (Target);

  Handle (PDataStd_TreeNode) TF;
  // Only stores myFirst , myNext
  // When retrieving the function 
  // myFirst is appended to me and the next of myFirst and subsequently the next of the next
  // are appended to me.

  Handle (TDataStd_TreeNode) F  = S->First();
  if (!F.IsNull ()) {
    if (!RelocTable->HasRelocation(F, TF)) {
      Standard_NoSuchObject::Raise("MDataStd_TreeNodeStorageDriver::Paste");
    }
    T->SetFirst(TF);
  }

  F  = S->Next();
  if (!F.IsNull ()) {
    if (!RelocTable->HasRelocation(F, TF)) {
      Standard_NoSuchObject::Raise("MDataStd_TreeNodeStorageDriver::Paste");
    }
    T->SetNext(TF);
  }
  T->SetTreeID(S->ID());
}