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c99ad5d760
Added possibility to inherit existing attributes if the same persistent fields are used. All methods that allow controlling the data model changes or getting some callbacks may be overridden in successor. They may have same GUIDs as a base class or new ones. Special macros IMPLEMENT_DERIVED_ATTRIBUTE and IMPLEMENT_DERIVED_ATTRIBUTE_WITH_TYPE must be used instead of standard Handle macro definition IMPLEMENT_STANDARD_RTTIEXT to register new derived attributes. Using this improvement several existing attributes from TDataStd, TDataXtd and XCAFDoc packages become inherited from other base attribute-classes. XML and Bin drivers of these attributes are removed. New base attribute classes are added: TDataStd_GenericEmpty and TDataStd_GenericExtString. This improvement does not change both present formats Bin and XML documents. The obsolete Standard scheme is not changed at all.
67 lines
2.2 KiB
C++
67 lines
2.2 KiB
C++
// Created on: 1997-12-10
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// Created by: Denis PASCAL
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// Copyright (c) 1997-1999 Matra Datavision
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// Copyright (c) 1999-2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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#ifndef _TDataStd_Relation_HeaderFile
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#define _TDataStd_Relation_HeaderFile
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#include <TDataStd_Expression.hxx>
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class TDataStd_Relation;
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DEFINE_STANDARD_HANDLE(TDataStd_Relation, TDataStd_Expression)
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//! Relation attribute.
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//! ==================
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//!
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//! * Data Structure of the Expression is stored in a
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//! string and references to variables used by the string
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//!
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//! Warning: To be consistent, each Variable referenced by the
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//! relation must have its equivalent in the string
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class TDataStd_Relation : public TDataStd_Expression
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{
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public:
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//! class methods
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//! =============
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Standard_EXPORT static const Standard_GUID& GetID();
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//! Find, or create, an Relation attribute.
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//! Real methods
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//! ============
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Standard_EXPORT static Handle(TDataStd_Relation) Set (const TDF_Label& label);
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Standard_EXPORT TDataStd_Relation();
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Standard_EXPORT void SetRelation (const TCollection_ExtendedString& E);
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Standard_EXPORT const TCollection_ExtendedString& GetRelation() const;
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Standard_EXPORT const Standard_GUID& ID() const Standard_OVERRIDE;
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Standard_EXPORT virtual Standard_OStream& Dump (Standard_OStream& anOS) const Standard_OVERRIDE;
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//! Dumps the content of me into the stream
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Standard_EXPORT virtual void DumpJson (Standard_OStream& theOStream, Standard_Integer theDepth = -1) const Standard_OVERRIDE;
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DEFINE_DERIVED_ATTRIBUTE(TDataStd_Relation,TDataStd_Expression)
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};
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#endif // _TDataStd_Relation_HeaderFile
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