-- File:	BooleanOperations_Explorer.cdl
-- Created:	Mon Sep  4 11:04:51 2000
-- Author:	Vincent DELOS
--		<vds@bulox.paris1.matra-dtv.fr>
---Copyright:	 Matra Datavision 2000


class Explorer from BooleanOperations 

	---Purpose:  the explorer associated  to the Data Structure to
	--          retrieve   subshapes of a  given   shape stored in
	--          ShapesDataStructure.

uses
    Shape    from TopoDS,
    ShapeEnum from TopAbs,
    ShapesDataStructure from BooleanOperations,
    PShapesDataStructure from BooleanOperations

is
    Create (SDS: ShapesDataStructure)  
    	returns Explorer from BooleanOperations;

    --modified by NIZNHY-PKV Sun Dec 15 16:24:39 2002  f 
    Delete(me:  out)  
    	is virtual; 
    ---C++:  alias  "Standard_EXPORT virtual ~BooleanOperations_Explorer()  {Delete();}" 
    --modified by NIZNHY-PKV Sun Dec 15 16:27:53 2002  t 
    
    Init (me:in out;  
    	aShape: Integer;  
    	TargetToFind: ShapeEnum;  
    	TargetToAvoid: ShapeEnum = TopAbs_SHAPE) is virtual;
    
    Next (me:in out)  
    	is virtual;
    
    More (me)  
    	returns Boolean;
    
    Current (me:in out)  
    	returns Integer is virtual;

    Dump (me; S : in out OStream)  
    	is virtual;


fields

myShapesDataStructure: PShapesDataStructure is protected;
---Purpose: the data structure we're working on.

myStack : Address is protected;
---Purpose: contains all the numbers associated to the shapes.
myTopOfStack : Integer is protected;
---Purpose: gives the position of  the  highest element in the stack,
--          i.e. the index of the number of the current shape.
mySizeOfStack : Integer is protected;
---Purpose: gives the number of elements in the stack.

myTargetToFind : ShapeEnum is protected;
---Purpose: the kind of shape we are looking for.
myTargetToAvoid: ShapeEnum is protected;
---Purpose: the kind of shape we want to avoid.

hasMore : Boolean is protected;
---Purpose: if we still have a new shape to return.

end Explorer;