Alright, thanks Aleksey, this is clear!
Many thanks.
On Fri, May 22, 2009 at 07:10:33AM -0700, Aleksey Didik wrote:
>
> Hi, ways are different, depends on what you want to have :)
>
> If composites are predefined on the injector creation moment, may be
> better to use multibinding:
>
> interface A { void make();}
>
> static class B implements A {
> public void make() {}
> }
>
> static class CompositeA implements A {
> Collection<A> composites;
>
> @Inject
> CompositeA(Set<A> composites) {
> this.composites = composites;
> }
>
> @Override
> public void make() {
> for (A composite : composites) {
> composite.make();
> }
> }
> }
>
> public static void main(String[] args) {
> Injector inj = Guice.createInjector(new AbstractModule() {
> @Override
> protected void configure() {
> bind(A.class).to(CompositeA.class);
> final Multibinder<A> multibinder =
> Multibinder.newSetBinder(binder(), A.class);
> multibinder.addBinding().to(B.class);
> multibinder.addBinding().toInstance(new B());
> }
> });
> }
>
> Set of A will be injected to CompositeA by Guice.
> But it's hardly predefined composites and only Set could be used.
> But composites will be injected by Guice, not by hand.
> More here: http://code.google.com/p/google-guice/wiki/Multibindings
>
> If composites can be changed in runtime, @Provides method or custom
> provider is the best one.
>
> Good luck,
> Aleksey.
>
>
> On May 22, 5:59 pm, Jelle Herold <[email protected]> wrote:
> > Hi List,
> >
> > First: thanks for this fantastic project, it is really well designed!
> >
> > One question, I have a composite object, like so
> >
> > interface A { do(); }
> >
> > class B implements A { do() { ... } }
> >
> > class CompositeA implements A {
> > List<A> composites = ...
> > add(A a) { composites.add(a) };
> > do() {
> > for(A a : composites)
> > a.do();
> > }
> > }
> >
> > What would be the best way to inject this?
> >
> > Right know I configure it in my Module using @Provides, like so
> >
> > @Provides A provideA() {
> > final CompositeA a = new CompositeA();
> > a.add(new B());
> > a.add(new B());
> > return a;
> > }
> >
> > Although this works, it feels like I should be doing this differently.
> >
> > Please comment,
> >
> > Thanks for you time.
> > Jelle.
> >
> > signature.asc
> > < 1KViewDownload
> >
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