Mailinglist Archive: zypp-devel (115 mails)

[Michael Andres <ma@xxxxxxx>]

On Tue, Jul 03, Stefan Hundhammer wrote:

> The selectable is what groups those resolvables of the same kind so we can 
> display ONE list items for "emacs".
>
> Yes, of course, we could move that to the UI, too. We could let the UI iterate 
> over all packages and group those together that have the same name. Thus we 
> could move the handling of selectables to the UI level.
>
> That's basicaly what the current zypp::ui::selectable implementation does. And 
> that's also the reason why there is no back-pointer, i.e. no way to move to a 

IMO not.

If we'd group "ALL resolvables of the same kind and name" into ONE 
selectable, we could easily implement the back-pointer:

1)  Pool                  Selectable

    i:kernel-1.0 ---+
    i:kernel-1.2 ---+
                    +---- Selectable(package,kernel)
    a:kernel-1.2 ---+
    a:kernel-2.0 ---+



But it is done that way:

    Pool                  Selectables

    i:kernel-1.0 ---+---- S1(package,kernel) ----+
                                                 |
    i:kernel-1.2 ---+---- S2(package,kernel) --+ |
                                               | |
    a:kernel-1.2 ---+--------------------------+-+
    a:kernel-2.0 ---+

One selectable for each installed version, ignoring the presence of other 
installed versions. Here we had to implement back-pointer lists. Here the 
selectable does not neccessarily contain all relevant information about 
the resolvables (S1 is not aware of kernel-1.2). This kind of grouping is 
IMO not helpfull outside the UI.

If the UI could use a structure like in 1) we could advance.

-- 

cu,
    Michael Andres

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