-- Created on: 1992-04-07
-- 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.

class UndefinedEntity  from IGESData  inherits IGESEntity

    ---Purpose : undefined (unknown or error) entity specific of IGES
    --           DirPart can be correct or not : if it is not, a flag indicates
    --           it, and each corrupted field has an associated error flag

uses OStream, Check, UndefinedContent, CopyTool,
     DefType, DefList, IGESReaderData, DirPart, ParamReader, IGESWriter

is

    Create returns UndefinedEntity;
    ---Purpose : creates an unknown entity

    UndefinedContent (me) returns UndefinedContent;
    ---Purpose : Returns own data as an UndefinedContent

    ChangeableContent (me : mutable) returns UndefinedContent;
    ---Purpose : Returns own data as an UndefinedContent, in order to touch it

    SetNewContent (me : mutable; cont : UndefinedContent);
    ---Purpose : Redefines a completely new UndefinedContent
    --           Used by a Copy which begins by ShallowCopy, for instance

    IsOKDirPart (me) returns Boolean;
    ---Purpose : says if DirPart is OK or not (if not, it is erroneous)
    --           Note that if it is not, Def* methods can return Error status

    DirStatus (me) returns Integer;
    ---Purpose : returns Directory Error Status (used for Copy)

    SetOKDirPart (me : mutable);
    ---Purpose : Erases the Directory Error Status
    --  Warning : Be sure that data are consistent to call this method ...


    DefLineFont (me) returns DefType  is redefined;
    ---Purpose : returns Error status if necessary, else calls original method

    DefLevel    (me) returns DefList  is redefined;
    ---Purpose : returns Error status if necessary, else calls original method

    DefView     (me) returns DefList  is redefined;
    ---Purpose : returns Error status if necessary, else calls original method

    DefColor    (me) returns DefType  is redefined;
    ---Purpose : returns Error status if necessary, else calls original method

    HasSubScriptNumber (me) returns Boolean  is redefined;
    ---Purpose : returns Error status if necessary, else calls original method
    --           (that is, if SubScript field is not blank or positive integer)


    ReadDir (me : mutable; IR : IGESReaderData; DP : in out DirPart;
    	     ach : in out Check)
    	returns Boolean  is virtual;
    ---Purpose : Computes the Directory Error Status, to be called before
    --           standard ReadDir from IGESReaderTool
    --           Returns True if OK (hence, Directory can be loaded),
    --           Else returns False and the DirPart <DP> is modified
    --           (hence, Directory Error Status is non null; and standard Read
    --            will work with an acceptable DirectoryPart)

    ReadOwnParams (me : mutable; IR : IGESReaderData; PR : in out ParamReader)
    	  is virtual;
    ---Purpose : reads own parameters from file; PR gives access to them, IR
    --           detains parameter types and values
    --           Here, reads all parameters, integers are considered as entity
    --           reference unless they cannot be; no list interpretation
    --           No property or associativity list is managed

    WriteOwnParams (me; IW : in out IGESWriter)  is virtual;
    ---Purpose : writes parameters to IGESWriter, taken from UndefinedContent

fields

    thedstat : Integer;  -- DirPart error bitwise flags (none set -> OK)
    thecont  : UndefinedContent;

end UndefinedEntity;