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 // Created on: 1996-09-25
 // Created by: Christian CAILLET
 // Copyright (c) 1996-1999 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_SelectExplore_HeaderFile
 #define _IFSelect_SelectExplore_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_Type.hxx>
 
 #include <Standard_Integer.hxx>
 #include <IFSelect_SelectDeduct.hxx>
 class Interface_EntityIterator;
 class Interface_Graph;
 class Standard_Transient;
 class TCollection_AsciiString;
 
 //! A SelectExplore determines from an input list of Entities,
 //! a list obtained by a way of exploration. This implies the
 //! possibility of recursive exploration : the output list is
 //! itself reused as input, etc...
 //! Examples : Shared Entities, can be considered at one level
 //! (immediate shared) or more, or max level
 //!
 //! Then, for each input entity, if it is not rejected, it can be
 //! either taken itself, or explored : it then produces a list.
 //! According to a level, either the produced lists or taken
 //! entities give the result (level one), or lists are themselves
 //! considered and for each item, is it taken or explored.
 //!
 //! Remark that rejection is just a safety : normally, an input
 //! entity is, either taken itself, or explored
 //! A maximum level can be specified. Else, the process continues
 //! until all entities have been either taken or rejected
 class IFSelect_SelectExplore : public IFSelect_SelectDeduct
 {
 
 public:
   //! Returns the required exploring level
   Standard_EXPORT int Level() const;
 
   //! Returns the list of selected entities. Works by calling the
   //! method Explore on each input entity : it can be rejected,
   //! taken for output, or to explore. If the maximum level has not
   //! yet been attained, or if no max level is specified, entities
   //! to be explored are themselves used as if they were input
   Standard_EXPORT Interface_EntityIterator RootResult(const Interface_Graph& G) const override;
 
   //! Analyses and, if required, Explores an entity, as follows :
   //! The explored list starts as empty, it has to be filled by this
   //! method.
   //! If it returns False, <ent> is rejected for result (this is to
   //! be used only as safety)
   //! If it returns True and <explored> remains empty, <ent> is
   //! taken itself for result, not explored
   //! If it returns True and <explored> is not empty, the content
   //! of this list is considered :
   //! If maximum level is attained, it is taken for result
   //! Else (or no max), each of its entity will be itself explored
   Standard_EXPORT virtual bool Explore(const int                              level,
                                        const occ::handle<Standard_Transient>& ent,
                                        const Interface_Graph&                 G,
                                        Interface_EntityIterator&              explored) const = 0;
 
   //! Returns a text saying "(Recursive)" or "(Level nn)" plus
   //! specific criterium returned by ExploreLabel (see below)
   Standard_EXPORT TCollection_AsciiString Label() const override;
 
   //! Returns a text defining the way of exploration
   Standard_EXPORT virtual TCollection_AsciiString ExploreLabel() const = 0;
 
   DEFINE_STANDARD_RTTIEXT(IFSelect_SelectExplore, IFSelect_SelectDeduct)
 
 protected:
   //! Initializes a SelectExplore : the level must be specified on
   //! starting. 0 means all levels, 1 means level one only, etc...
   Standard_EXPORT IFSelect_SelectExplore(const int level);
 
 private:
   int thelevel;
 };
 
 #endif // _IFSelect_SelectExplore_HeaderFile

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