Another option:
class SeasonalPromoProvider implements Provider<Promo> {
@Inject Provider<Season> seasonProvider;
@Inject Map<Season, Provider<Promo>> seasonalPromoMap; // bind with
MapBinder
public Promo get() {
return seasonalPromoMap.get(seasonProvider.get()).get(); // enough gets
for one line?
}
}
Colin
On Tue, Feb 1, 2011 at 12:18 PM, Philippe Beaudoin <
[email protected]> wrote:
> I have been using factories to do this. Something like:
>
>
> class PromoFactory {
> @Inject
> Provider<SpringPromo> springPromo;
>
> @Inject
> Provider<WinterPromo> winterPromo;
>
> Promo getPromo(Season season) {
> if( season == Season.Winter ) return winterPromo;
> return springPromo;
> }
> }
>
> Then inject the PromoFactory.
>
> This pattern can be used for the various other scenarios you describe,
> I believe.
>
> Philippe
>
> On Tue, Feb 1, 2011 at 2:24 AM, Adrian <[email protected]> wrote:
> > Hello,
> >
> > I have the following problem :
> >
> > Let's say that I have a Display class which needs a Promo to display.
> >
> > I have two type of promos SpringPromo and WinterPromo.
> >
> > The display doesn't care what kind of promo it displays as long it is
> > a Promo.
> >
> > I would like to find a solution so
> > - when season is Winter, to inject WinterPromo
> > - when seazon is Spring, to inject SpringPromo
> >
> > Can you help me find a solution ?
> >
> > What if there are other (many)kinds of promos which depend on
> > seasons ?
> > What if there are other (many)kinds of seasons ?
> > What if not only Promos depend on seazon ?
> >
> > Thank you,
> >
> > Adrian
> >
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