-- File:	STEPConstruct_Assembly.cdl
-- Created:	Tue Jul  7 09:13:40 1998
-- Author:	Christian CAILLET
--		<cky@heliox.paris1.matra-dtv.fr>
---Copyright:	 Matra Datavision 1998


class Assembly  from STEPConstruct

    ---Purpose : This operator creates an item of an assembly, from its
    --           basic data : a ShapeRepresentation, a Location ...
    --           
    --           Three ways of coding such item from a ShapeRepresentation :
    --           - do nothing : i.e. informations for assembly are ignored
    --           - create a MappedItem
    --           - create a RepresentationRelationship (WithTransformation)

uses
    Trsf from gp,
    InterfaceModel from Interface, 
    Axis2Placement3d from StepGeom,
    ShapeRepresentation from StepShape,
    ShapeDefinitionRepresentation from StepShape,
    NextAssemblyUsageOccurrence from StepRepr,
    ContextDependentShapeRepresentation from StepShape
is

    Create returns Assembly from STEPConstruct;

    Init (me: in out; aSR, SDR0: ShapeDefinitionRepresentation from StepShape;
    	              Ax0, Loc : Axis2Placement3d from StepGeom);
    ---Purpose : Initialises with starting values
    --           Ax0 : origin axis (typically, standard XYZ)
    --           Loc : location to which place the item

--    MakeMappedItem (me: in out);
    ---Purpose : Makes a MappedItem
    --           Resulting Value is returned by ItemValue

    MakeRelationship (me: in out);
    ---Purpose : Make a (ShapeRepresentationRelationship,...WithTransformation)
    --           Resulting Value is returned by ItemValue

    ItemValue (me) returns Transient;
    ---Purpose : Returns the Value
    --           If no Make... has been called, returns the starting SR

    ItemLocation (me) returns Axis2Placement3d from StepGeom;
    ---Purpose : Returns the location of the item, computed from starting aLoc

    GetNAUO (me) returns NextAssemblyUsageOccurrence from StepRepr;
    	---Purpose: Returns NAUO object describing the assembly link

    CheckSRRReversesNAUO (myclass; Model: InterfaceModel from Interface; 
    	    	    	           CDSR : ContextDependentShapeRepresentation from StepShape)
    returns Boolean;
    	---Purpose: Checks whether SRR's definition of assembly and component contradicts
        --          with NAUO definition or not, according to model schema (AP214 or AP203)
	--          
	
fields

    thesdr : ShapeDefinitionRepresentation from StepShape;
    thesdr0: ShapeDefinitionRepresentation from StepShape;
    thesr  : ShapeRepresentation from StepShape;
    thesr0 : ShapeRepresentation from StepShape;
    theval : Transient;
    theloc : Axis2Placement3d from StepGeom;
    theax0 : Axis2Placement3d from StepGeom;

end Assembly;