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 // Created on: 1992-09-23
 // 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 _IFGraph_SubPartsIterator_HeaderFile
 #define _IFGraph_SubPartsIterator_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 #include <Standard_Handle.hxx>
 
 #include <Interface_Graph.hxx>
 #include <Standard_Integer.hxx>
 #include <NCollection_Sequence.hxx>
 #include <NCollection_HSequence.hxx>
 #include <Standard_Boolean.hxx>
 class Interface_InterfaceModel;
 class Standard_Transient;
 class Interface_EntityIterator;
 class Interface_GraphContent;
 
 //! defines general form for graph classes of which result is
 //! not a single iteration on Entities, but a nested one :
 //! External iteration works on sub-parts, identified by each
 //! class (according to its algorithm)
 //! Internal Iteration concerns Entities of a sub-part
 //! Sub-Parts are assumed to be disjoined; if they are not,
 //! the first one has priority
 //!
 //! A SubPartsIterator can work in two steps : first, load
 //! entities which have to be processed
 //! then, analyse to set those entities into sub-parts
 class IFGraph_SubPartsIterator
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! Creates with a Graph, whole or parts of it
   //! whole True  : works on the entire Model
   //! whole False : empty, ready to be filled
   //! SubPartIterator is set to load entities
   Standard_EXPORT IFGraph_SubPartsIterator(const Interface_Graph& agraph, const bool whole);
 
   //! Creates a SubPartIterator from another one and gets its Data
   //! Note that only non-empty sub-parts are taken into account
   //! PartNum is set to the last one
   Standard_EXPORT IFGraph_SubPartsIterator(IFGraph_SubPartsIterator& other);
 
   //! Gets Parts from another SubPartsIterator (in addition to the
   //! ones already recorded)
   //! Error if both SubPartsIterators are not based on the same Model
   Standard_EXPORT void GetParts(IFGraph_SubPartsIterator& other);
 
   //! Returns the Model with which this Iterator was created
   Standard_EXPORT occ::handle<Interface_InterfaceModel> Model() const;
 
   //! Adds an empty part and sets it to receive entities
   Standard_EXPORT void AddPart();
 
   //! Returns count of registered parts
   Standard_EXPORT int NbParts() const;
 
   //! Returns numero of part which currently receives entities
   //! (0 at load time)
   Standard_EXPORT int PartNum() const;
 
   //! Sets SubPartIterator to get Entities (by GetFromEntity &
   //! GetFromIter) into load status, to be analysed later
   Standard_EXPORT void SetLoad();
 
   //! Sets numero of receiving part to a new value
   //! Error if not in range (1-NbParts)
   Standard_EXPORT void SetPartNum(const int num);
 
   //! Adds an Entity : into load status if in Load mode, to the
   //! current part if there is one. If shared is True, adds
   //! also its shared ones (shared at all levels)
   Standard_EXPORT void GetFromEntity(const occ::handle<Standard_Transient>& ent, const bool shared);
 
   //! Adds a list of Entities (into Load mode or to a Part),
   //! given as an Iterator
   Standard_EXPORT void GetFromIter(const Interface_EntityIterator& iter);
 
   //! Erases data (parts, entities) : "me" becomes empty and in
   //! load status
   Standard_EXPORT void Reset();
 
   //! Called by Clear, this method allows evaluation just before
   //! iteration; its default is doing nothing, it is designed to
   //! be redefined
   Standard_EXPORT virtual void Evaluate();
 
   //! Returns entities which where loaded (not set into a sub-part)
   Standard_EXPORT Interface_GraphContent Loaded() const;
 
   //! Same as above, but under the form of a Graph
   Standard_EXPORT Interface_Graph LoadedGraph() const;
 
   //! Returns True if an Entity is loaded (either set into a
   //! sub-part or not)
   Standard_EXPORT bool IsLoaded(const occ::handle<Standard_Transient>& ent) const;
 
   //! Returns True if an Entity is Present in a sub-part
   Standard_EXPORT bool IsInPart(const occ::handle<Standard_Transient>& ent) const;
 
   //! Returns number of the sub-part in which an Entity has been set
   //! if it is not in a sub-part (or not loaded at all), Returns 0
   Standard_EXPORT int EntityPartNum(const occ::handle<Standard_Transient>& ent) const;
 
   //! Sets iteration to its beginning; calls Evaluate
   Standard_EXPORT void Start();
 
   //! Returns True if there are more sub-parts to iterate on
   //! Note : an empty sub-part is not taken in account by Iteration
   Standard_EXPORT bool More();
 
   //! Sets iteration to the next sub-part
   //! if there is not, IsSingle-Entities will raises an exception
   Standard_EXPORT void Next();
 
   //! Returns True if current sub-part is single (has only one Entity)
   //! Error if there is no sub-part to iterate now
   Standard_EXPORT bool IsSingle() const;
 
   //! Returns the first entity of current sub-part, that is for a
   //! Single one, the only one it contains
   //! Error : same as above (end of iteration)
   Standard_EXPORT occ::handle<Standard_Transient> FirstEntity() const;
 
   //! Returns current sub-part, not as a "Value", but as an Iterator
   //! on Entities it contains
   //! Error : same as above (end of iteration)
   Standard_EXPORT Interface_EntityIterator Entities() const;
 
   Standard_EXPORT virtual ~IFGraph_SubPartsIterator();
 
 protected:
   Interface_Graph thegraph;
 
 private:
   //! Returns the Graph used by <me>. Used to create another
   //! SubPartsIterator from <me>
   Standard_EXPORT const Interface_Graph& Graph() const;
 
   occ::handle<NCollection_HSequence<int>> theparts;
   occ::handle<NCollection_HSequence<int>> thefirsts;
   int                                     thepart;
   int                                     thecurr;
 };
 
 #endif // _IFGraph_SubPartsIterator_HeaderFile

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