-- Created on: 1994-03-21
-- Created by: Christian CAILLET
-- Copyright (c) 1994-1999 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.

deferred generic class  FileModifier  from IFSelect
    	 (Writer   as any)  -- according each Interface
    inherits GeneralModifier

    ---Purpose : Allows to precise the frame work for File Modifiers able to
    --           run with an Interface (such as STEP, VDA, IGES ...)
    --           
    --           Remember that File Modifiers are activated by a WorkLibrary :
    --           if they inherit from an instantiation of FileModifier with the
    --           data from this Interface, this will be easier to do.
    --           They are activated before sending the file, in the order
    --           given by the ModielCopier.
    --           
    --           For each Interface on which File Modifiers have to be defined,
    --           The way to follow is firstly to instantiate FileModifier with
    --           its specific data :
    --           Model is the InterfaceModel specific to the considered norm
    --           Writer is the Writer specific to the considered norm
    --           Then to define the various classes which inherit from it and
    --           define their method Perform

uses ContextWrite

is

    Initialize;
    ---Purpose : Sets a File Modifier to keep the graph of dependences
    --           unchanges (because it works on the model already produced)

    Perform (me; ctx : in out ContextWrite; writer : in out Writer)
    	is deferred;
    ---Purpose : Perform the action specific to each class of File Modifier
    --           <ctx> is the ContextWrite, which brings : the model, the
    --           protocol, the file name, plus the object AppliedModifiers
    --           (not used here) and the CheckList
    --           Remark that the model has to be casted for specific access
    --           
    --           <writer> is the Writer and is specific to each norm, on which
    --             to act


end FileModifier;