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-- File: IFSelect_GeneralModifier.cdl
-- Created: Tue Oct 19 17:22:55 1993
-- Author: Christian CAILLET
-- <cky@sdsun2>
---Copyright: Matra Datavision 1993
deferred class GeneralModifier from IFSelect inherits TShared
---Purpose : This class gives a frame for Actions which modify the effect
-- of a Dispatch, i.e. :
-- By Selections and Dispatches, an original Model can be
-- splitted into one or more "target" Models : these Models
-- contain Entities copied from the original one (that is, a
-- part of it). Basically, these dispatched Entities are copied
-- as identical to their original counterparts. Also the copied
-- Models reproduce the Header of the original one.
--
-- Modifiers allow to change this copied content : this is the
-- way to be used for any kind of alterations, adaptations ...
-- They are exploited by a ModelCopier, which firstly performs
-- the copy operation described by Dispatches, then invokes the
-- Modifiers to work on the result.
--
-- Each GeneralModifier can be attached to :
-- - all the Models produced
-- - a Dispatch (it will be applied to all the Models obtained
-- from this Dispatch) designated by its Ident in a ShareOut
-- - in addition, to a Selection (facultative) : this adds a
-- criterium, the Modifier is invoked on a produced Model only
-- if this Model contains an Entity copied from one of the
-- Entities designated by this Selection.
-- (for special Modifiers from IFAdapt, while they must work on
-- definite Entities, this Selection is mandatory to run)
--
-- Remark : this class has no action attached, it only provides
-- a frame to work on criteria. Then, sub-classes will define
-- their kind of action, which can be applied at a precise step
-- of the production of a File : see Modifier, and in the
-- package IFAdapt, EntityModifier and EntityCopier
uses AsciiString from TCollection, Selection, Dispatch
is
Initialize (maychangegraph : Boolean);
---Purpose : Sets the Modifier criteria to default Values
-- (i.e. "always applies")
-- <maychangegraph> must be provided at creation time, to :
-- - False if this GeneralModifier surely lets the graph of
-- dependencies unchanged (NO edition of any reference, BUT
-- also NO entity added or replaced or removed)
-- - True if there is a possibility of changing the graph of
-- dependencies when this modifier is applied
MayChangeGraph (me) returns Boolean;
---Purpose : Returns True if this modifier may change the graph of
-- dependences (aknowledged at creation time)
SetDispatch (me : mutable; disp : any Dispatch);
---Purpose : Attaches to a Dispatch. If <disp> is Null, Resets it
-- (to apply the Modifier on every Dispatch)
Dispatch (me) returns any Dispatch;
---Purpose : Returns the Dispatch to be matched, Null if not set
Applies (me; disp : Dispatch) returns Boolean;
---Purpose : Returns True if a Model obtained from the Dispatch <disp>
-- is to be treated (apart from the Selection criterium)
-- If Dispatch(me) is Null, returns True. Else, checks <disp>
SetSelection (me : mutable; sel : mutable Selection);
---Purpose : Sets a Selection : a Model is treated if it contains one or
-- more Entities designated by the Selection
ResetSelection (me : mutable);
---Purpose : Resets the Selection : this criterium is not longer active
HasSelection (me) returns Boolean;
---Purpose : Returns True if a Selection is set as an additionnal criterium
Selection (me) returns mutable Selection;
---Purpose : Returns the Selection, or a Null Handle if not set
Label (me) returns AsciiString from TCollection is deferred;
---Purpose : Returns a short text which defines the operation performed
fields
thesel : Selection;
thedisp : Dispatch;
thechgr : Boolean;
end GeneralModifier;
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