// Created on: 1990-12-20
// Created by: Remi Lequette
// Copyright (c) 1990-1999 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 _TopExp_HeaderFile
#define _TopExp_HeaderFile

#include <Standard.hxx>
#include <Standard_DefineAlloc.hxx>
#include <Standard_Handle.hxx>

#include <TopAbs_ShapeEnum.hxx>
#include <TopTools_IndexedMapOfShape.hxx>
#include <TopTools_IndexedDataMapOfShapeListOfShape.hxx>
#include <Standard_Boolean.hxx>
class TopoDS_Shape;
class TopoDS_Vertex;
class TopoDS_Edge;
class TopoDS_Wire;
class TopExp_Explorer;


//! This package   provides  basic tools  to   explore the
//! topological data structures.
//!
//! * Explorer : A tool to find all sub-shapes of  a given
//! type. e.g. all faces of a solid.
//!
//! * Package methods to map sub-shapes of a shape.
//!
//! Level : Public
//! All methods of all  classes will be public.
class TopExp 
{
public:

  DEFINE_STANDARD_ALLOC

  
  //! Tool to explore a topological data structure.
  //! Stores in the map <M> all  the sub-shapes of <S>
  //! of type <T>.
  //!
  //! Warning: The map is not cleared at first.
  Standard_EXPORT static void MapShapes (const TopoDS_Shape& S, const TopAbs_ShapeEnum T, TopTools_IndexedMapOfShape& M);
  
  //! Stores in the map <M> all  the sub-shapes of <S>.
  Standard_EXPORT static void MapShapes (const TopoDS_Shape& S, TopTools_IndexedMapOfShape& M);
  
  //! Stores in the map <M> all the subshape of <S> of
  //! type <TS>  for each one append  to  the list all
  //! the ancestors of type <TA>.  For example map all
  //! the edges and bind the list of faces.
  //! Warning: The map is not cleared at first.
  Standard_EXPORT static void MapShapesAndAncestors (const TopoDS_Shape& S, const TopAbs_ShapeEnum TS, const TopAbs_ShapeEnum TA, TopTools_IndexedDataMapOfShapeListOfShape& M);
  
  //! Returns the Vertex of orientation FORWARD in E. If
  //! there is none returns a Null Shape.
  //! CumOri = True : taking account the edge orientation
  Standard_EXPORT static TopoDS_Vertex FirstVertex (const TopoDS_Edge& E, const Standard_Boolean CumOri = Standard_False);
  
  //! Returns the Vertex of orientation REVERSED in E. If
  //! there is none returns a Null Shape.
  //! CumOri = True : taking account the edge orientation
  Standard_EXPORT static TopoDS_Vertex LastVertex (const TopoDS_Edge& E, const Standard_Boolean CumOri = Standard_False);
  
  //! Returns in Vfirst, Vlast the  FORWARD and REVERSED
  //! vertices of the edge <E>. May be null shapes.
  //! CumOri = True : taking account the edge orientation
  Standard_EXPORT static void Vertices (const TopoDS_Edge& E, TopoDS_Vertex& Vfirst, TopoDS_Vertex& Vlast, const Standard_Boolean CumOri = Standard_False);
  
  //! Returns  in  Vfirst,  Vlast   the first   and last
  //! vertices of the open wire <W>. May be null shapes.
  //! if   <W>  is closed Vfirst and Vlast  are a same
  //! vertex on <W>.
  //! if <W> is no manifold. VFirst and VLast are null
  //! shapes.
  Standard_EXPORT static void Vertices (const TopoDS_Wire& W, TopoDS_Vertex& Vfirst, TopoDS_Vertex& Vlast);
  
  //! Finds   the  vertex <V> common   to  the two edges
  //! <E1,E2>, returns True if this vertex exists.
  //!
  //! Warning: <V> has sense only if the value <True> is returned
  Standard_EXPORT static Standard_Boolean CommonVertex (const TopoDS_Edge& E1, const TopoDS_Edge& E2, TopoDS_Vertex& V);




protected:





private:




friend class TopExp_Explorer;

};







#endif // _TopExp_HeaderFile