src/IFSelect/IFSelect_SelectRoots.cdl


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-- File:	SelectRoots.cdl
-- Created:	Wed Nov 18 10:09:31 1992
-- Author:	Christian CAILLET
--		<cky@topsn2>
---Copyright:	 Matra Datavision 1992


class SelectRoots  from IFSelect  inherits SelectExtract

    ---Purpose : A SelectRoots sorts the Entities which are local roots of a
    --           set of Entities (not shared by other Entities inside this set,
    --           even if they are shared by other Entities outside it)

uses AsciiString from TCollection, InterfaceModel, EntityIterator, Graph

is

    Create returns mutable SelectRoots;
    ---Purpose : Creates a SelectRoots

    RootResult (me; G : Graph) returns EntityIterator  is redefined;
    ---Purpose : Returns the list of local roots. It is redefined for a purpose
    --           of effeciency : calling a Sort routine for each Entity would
    --           cost more ressource than to work in once using a Map
    --           RootResult takes in account the Direct status

    HasUniqueResult (me) returns Boolean  is redefined protected;
    ---Purpose : Returns True, because RootResult assures uniqueness

    Sort (me; rank : Integer; ent : Transient; model : InterfaceModel)
    	returns Boolean;
    ---Purpose : Returns always True, because RootResult has done work

    ExtractLabel (me) returns AsciiString from TCollection;
    ---Purpose : Returns a text defining the criterium : "Local Root Entities"

end SelectRoots;