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// File: TObj_TReference.hxx
// Created: Tue Nov 23 12:54:28 2004
// Author: Pavel TELKOV
// Copyright: Open CASCADE 2007
// The original implementation Copyright: (C) RINA S.p.A
#ifndef TObj_TReference_HeaderFile
#define TObj_TReference_HeaderFile
#include <TObj_Common.hxx>
#include <TDF_Attribute.hxx>
#include <TDF_Label.hxx>
class Handle(TObj_TReference);
class Handle(TObj_Object);
class Standard_GUID;
class Handle(TDF_RelocationTable);
/**
* Attribute for storing references to the objects which implement
* TObj_Object interface in the OCAF tree.
* Its persistency mechanism provides transparent method for storing
* cross-model references.
* Each reference, when created, registers itself in the referred object,
* to support back references
*/
class TObj_TReference : public TDF_Attribute
{
public:
//! Standard methods of OCAF attribute
//! Empty constructor
Standard_EXPORT TObj_TReference();
//! This method is used in implementation of ID()
static Standard_EXPORT const Standard_GUID& GetID();
//! Returns the ID of TObj_TReference attribute.
Standard_EXPORT const Standard_GUID& ID() const;
public:
//! Method for create TObj_TReference object
//! Creates reference on TDF_Label <theLabel> to the object <theObject> and
//! creates backreference from the object <theObject> to <theMaster> one.
static Standard_EXPORT Handle(TObj_TReference) Set
(const TDF_Label& theLabel,
const Handle(TObj_Object)& theObject,
const Handle(TObj_Object)& theMaster);
public:
//! Methods for setting and obtaining referenced object
//! Sets the reference to the theObject
Standard_EXPORT void Set(const Handle(TObj_Object)& theObject,
const TDF_Label& theMasterLabel);
//! Sets the reference to the theObject at indicated Label.
//! It is method for persistent only. Don`t use anywhere else.
Standard_EXPORT void Set(const TDF_Label& theLabel,
const TDF_Label& theMasterLabel);
//! Returns the referenced theObject
Standard_EXPORT Handle(TObj_Object) Get() const;
//! Returns the Label of master object.
Standard_EXPORT TDF_Label GetMasterLabel() const {return myMasterLabel;}
//! Returns the referred label.
Standard_EXPORT TDF_Label GetLabel() const {return myLabel;}
public:
//! Redefined OCAF abstract methods
//! Returns an new empty TObj_TReference attribute. It is used by the
//! copy algorithm.
Standard_EXPORT Handle(TDF_Attribute) NewEmpty() const;
//! Restores the backuped contents from <theWith> into this one. It is used
//! when aborting a transaction.
Standard_EXPORT void Restore(const Handle(TDF_Attribute)& theWith);
//! This method is used when copying an attribute from a source structure
//! into a target structure.
Standard_EXPORT void Paste(const Handle(TDF_Attribute)& theInto,
const Handle(TDF_RelocationTable)& theRT) const;
//! Remove back references of it reference if it is in other document.
virtual Standard_EXPORT void BeforeForget();
//! It is necessary for tranzaction mechanism (Undo/Redo).
virtual Standard_EXPORT Standard_Boolean BeforeUndo
(const Handle(TDF_AttributeDelta)& theDelta,
const Standard_Boolean isForced = Standard_False);
//! It is necessary for tranzaction mechanism (Undo/Redo).
virtual Standard_EXPORT Standard_Boolean AfterUndo
(const Handle(TDF_AttributeDelta)& theDelta,
const Standard_Boolean isForced = Standard_False);
//! Check if back reference exists for reference.
virtual Standard_EXPORT void AfterResume();
//! Called after retrieval reference from file.
virtual Standard_EXPORT Standard_Boolean AfterRetrieval
(const Standard_Boolean forceIt = Standard_False);
private:
//! Fields
TDF_Label myLabel; //!< Label that indicate referenced object
TDF_Label myMasterLabel; //!< Label of object that have this reference.
public:
//! CASCADE RTTI
DEFINE_STANDARD_RTTI(TObj_TReference)
};
//! Define handle class for TObj_TReference
DEFINE_STANDARD_HANDLE(TObj_TReference,TDF_Attribute)
#endif
#ifdef _MSC_VER
#pragma once
#endif
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