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RefSet.4gl
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1996-07-02
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-----------------------------------------------------------------------------
--
-- Copyright (c) 1994 by Westmount Technology B.V., Delft, The Netherlands.
--
-- This software is furnished under a license and may be used only in
-- accordance with the terms of such license and with the inclusion of
-- the above copyright notice. This software or any other copies thereof
-- may not be provided or otherwise made available to any other person.
-- No title to and ownership of the software is hereby transferred.
--
-- The information in this software is subject to change without notice
-- and should not be construed as a commitment by Westmount Technology B.V.
--
-----------------------------------------------------------------------------
--
-- File : @(#)RefSet.4gl 1.1
-- Author :
-- Original date : 19-10-1994
-- Description : A 'simple' set of object references
--
-----------------------------------------------------------------------------
INCLUDE "RefSet.4gh"
FUNCTION RefSet::RefSet()
LET s = NEW ORefSet()
LET curr = 0
END FUNCTION
FUNCTION RefSet::add(ref ixObject) RETURNING BOOLEAN
IF isPresent(ref) THEN
RETURN FALSE
END IF
IF s.append(ref) == 0 THEN
RETURN FALSE
END IF
RETURN TRUE
END FUNCTION
FUNCTION RefSet::remove(ref ixObject) RETURNING VOID
CALL s.remove(ref)
END FUNCTION
FUNCTION RefSet::isPresent(ref ixObject) RETURNING BOOLEAN
VARIABLE i INTEGER
FOR i = 1 TO s.getCount()
IF ref == s.get(i) THEN
RETURN TRUE
END IF
END FOR
RETURN FALSE
END FUNCTION
FUNCTION RefSet::size() RETURNING INTEGER
RETURN s.getCount()
END FUNCTION
FUNCTION RefSet::first() RETURNING ixObject
LET curr = 1
RETURN s.get(curr)
END FUNCTION
FUNCTION RefSet::next() RETURNING ixObject
LET curr = curr + 1
RETURN s.get(curr)
END FUNCTION