include/opencascade/TDF_AttributeIterator.hxx

0001 // Created by: DAUTRY Philippe
0002 // Copyright (c) 1998-1999 Matra Datavision
0003 // Copyright (c) 1999-2014 OPEN CASCADE SAS
0004 //
0005 // This file is part of Open CASCADE Technology software library.
0006 //
0007 // This library is free software; you can redistribute it and/or modify it under
0008 // the terms of the GNU Lesser General Public License version 2.1 as published
0009 // by the Free Software Foundation, with special exception defined in the file
0010 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
0011 // distribution for complete text of the license and disclaimer of any warranty.
0012 //
0013 // Alternatively, this file may be used under the terms of Open CASCADE
0014 // commercial license or contractual agreement.
0015
0016 //          -------------------------
0017
0018 // Version: 0.0
0019 // Version  Date        Purpose
0020 //      0.0 Feb 16 1998 Creation
0021
0022 #ifndef TDF_AttributeIterator_HeaderFile
0023 #define TDF_AttributeIterator_HeaderFile
0024
0025 #include <TDF_Label.hxx>
0026 #include <TDF_LabelNodePtr.hxx>
0027
0028 // This class provides a way to iterates on the
0029 // up-to-date (current) valid attributes of a label.
0030 //
0031 // This class should not be used for standard attributes workflow.
0032 // Application always knows what to search at particular label.
0033 // So, use IsAttribute and FindAttribute methods of
0034 // TDF_Label to check and get attributes in usual way.
0035 // This class may be used for processing of content of labels
0036 // in generic way, like copy-tool, specific save/restore algorithms,
0037 // etc.
0038 //
0039 // Even a forgotten attribute may be found if this
0040 // option is set. To use this possibility, look at
0041 // the constructor.
0042
0043 class TDF_AttributeIterator
0044 {
0045
0046 public:
0047   // Methods PUBLIC
0048   //
0049   Standard_EXPORT      TDF_AttributeIterator();
0050   Standard_EXPORT      TDF_AttributeIterator(const TDF_Label& aLabel,
0051                                              const bool       withoutForgotten = true);
0052   Standard_EXPORT      TDF_AttributeIterator(const TDF_LabelNodePtr aLabelNode,
0053                                              const bool             withoutForgotten = true);
0054   Standard_EXPORT void Initialize(const TDF_Label& aLabel, const bool withoutForgotten = true);
0055   inline bool          More() const;
0056   Standard_EXPORT void Next();
0057   inline occ::handle<TDF_Attribute> Value() const;
0058
0059   //! Provides an access to the internal pointer of the current attribute.
0060   //! The method has better performance as not-creating handle.
0061   inline const TDF_Attribute* PtrValue() const { return myValue; }
0062
0063 private:
0064   // Methods PRIVATE
0065   //
0066   void goToNext(const occ::handle<TDF_Attribute>& anAttr);
0067
0068   // Fields PRIVATE
0069   //
0070   TDF_Attribute* myValue;
0071   bool           myWithoutForgotten;
0072 };
0073
0074 // other inline functions and methods (like "C++: function call" methods)
0075 //
0076
0077 inline bool TDF_AttributeIterator::More() const
0078 {
0079   return (myValue != nullptr);
0080 }
0081
0082 inline occ::handle<TDF_Attribute> TDF_AttributeIterator::Value() const
0083 {
0084   return myValue;
0085 }
0086
0087 #endif