Hi Cezary,
Thanks a lot for the detailed response.
That InjectionProvider example looks like exactly what I am looking for.
I will give that a go.
Cheers,
Sonny
On Wed, Sep 28, 2011 at 2:59 PM, Cezary Biernacki <cezary...@gmail.com>wrote:
> Hi,
> I built a website with similar requirements, and it is not hard to do that
> with Tapestry. A simple approach is to built a service that returns correct
> 'Site' instance, and use it everywhere where you need to 'site'.
>
> So instead having
> private Site site;
>
> you would have, e.g.
> @Inject
> private SiteLookup lookup;
>
>
> and instead using 'site', you would use 'lookup.getSite()'. SiteLookup can
> depend on 'Request' service, so there is no need to pass it as argument to
> getSite() method.
>
> But, if you are not afraid of some more advanced machinery, you can
> contribute your own InjectionProvider, and inject 'Site' directly,
> something
> like:
>
>
> public class SiteInjectionProvider implements InjectionProvider {
> private final Request request;
>
> public SiteInjectionProvider (Request request) {
> this.request = request;
> }
>
> @Override
> public boolean provideInjection(String fieldName,
> @SuppressWarnings("rawtypes") Class fieldType,
> ObjectLocator locator, ClassTransformation transformation,
> MutableComponentModel componentModel) {
>
> if (!Site.class.equals(fieldType)) {
> return false;
> }
>
> TransformField field = transformation.getField(fieldName);
>
> ComponentValueProvider<FieldValueConduit> provider =
> createProvider(fieldName);
>
> field.replaceAccess(provider);
>
> return true;
> }
>
> private ComponentValueProvider<FieldValueConduit> createProvider(final
> String fieldName) {
>
> return new ComponentValueProvider<FieldValueConduit>() {
>
> public FieldValueConduit get(final ComponentResources resources)
> {
>
> return new ReadOnlyFieldValueConduit(resources, fieldName) {
> public Object get() {
> return ....; // <--- here implement selecting
> correct Site based on Request
> }
> };
> }
>
> };
> }
>
> }
>
>
> Remember to contribute your injection provider in your AppModule
>
> @Contribute(InjectionProvider.class)
> public static void
> setupInjectingSite(OrderedConfiguration<InjectionProvider> configuration) {
> configuration.addInstance("site", SiteInjectionProvider .class,
> "after:Default");
>
> }
>
>
> After that, you would be able to use
> @Inject
> private Site site;
>
> on your pages and components.
>
> Best regards,
> Cezary
>
>
