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 // Created on: 1992-11-17
 // Created by: Christian CAILLET
 // Copyright (c) 1992-1999 Matra Datavision
 // Copyright (c) 1999-2014 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.
 
 #ifndef _IFSelect_Selection_HeaderFile
 #define _IFSelect_Selection_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_Type.hxx>
 
 #include <Standard_Transient.hxx>
 class Interface_EntityIterator;
 class Interface_Graph;
 class IFSelect_SelectionIterator;
 class TCollection_AsciiString;
 
 class IFSelect_Selection;
 DEFINE_STANDARD_HANDLE(IFSelect_Selection, Standard_Transient)
 
 //! A Selection allows to define a set of Interface Entities.
 //! Entities to be put on an output file should be identified in
 //! a way as independent from such or such execution as possible.
 //! This permits to handle comprehensive criteria, and to replay
 //! them when a new variant of an input file has to be processed.
 //!
 //! Its input can be, either an Interface Model (the very source),
 //! or another-other Selection(s) or any other output.
 //! All list computations start from an input Graph (from IFGraph)
 class IFSelect_Selection : public Standard_Transient
 {
 
 public:
 
   //! Returns the list of selected entities, computed from Input
   //! given as a Graph. Specific to each class of Selection
   //! Note that uniqueness of each entity is not required here
   //! This method can raise an exception as necessary
   Standard_EXPORT virtual Interface_EntityIterator RootResult (const Interface_Graph& G) const = 0;
 
   //! Returns the list of selected entities, each of them being
   //! unique. Default definition works from RootResult. According
   //! HasUniqueResult, UniqueResult returns directly RootResult,
   //! or build a Unique Result from it with a Graph.
   Standard_EXPORT Interface_EntityIterator UniqueResult (const Interface_Graph& G) const;
 
   //! Returns the list of entities involved by a Selection, i.e.
   //! UniqueResult plus the shared entities (directly or not)
   Standard_EXPORT virtual Interface_EntityIterator CompleteResult (const Interface_Graph& G) const;
   
   //! Puts in an Iterator the Selections from which "me" depends
   //! (there can be zero, or one, or a list).
   //! Specific to each class of Selection
   Standard_EXPORT virtual void FillIterator (IFSelect_SelectionIterator& iter) const = 0;
   
   //! Returns a text which defines the criterium applied by a
   //! Selection (can be used to be printed, displayed ...)
   //! Specific to each class
   Standard_EXPORT virtual TCollection_AsciiString Label() const = 0;
 
   DEFINE_STANDARD_RTTIEXT(IFSelect_Selection,Standard_Transient)
 
 protected:
 
   //! Returns True if RootResult guarantees uniqueness for each
   //! Entity. Called by UniqueResult.
   //! Default answer is False. Can be redefined.
   Standard_EXPORT virtual Standard_Boolean HasUniqueResult() const;
 
 };
 
 #endif // _IFSelect_Selection_HeaderFile

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