> +
> +/**
> + * @author Jeremy Daggett
> + */
> +@Singleton
> +public class RegionToCDNEndpoint implements Function<Object, URI> {
> +
> + private final Supplier<Map<String, Supplier<URI>>> endpointsSupplier;
> +
> + @Inject
> + public RegionToCDNEndpoint(@ApiVersion final String apiVersion, final
> RegionIdToURISupplier.Factory factory) {
> + this.endpointsSupplier =
> factory.createForApiTypeAndVersion(ServiceType.OBJECT_CDN, apiVersion);
> + }
> +
> + public URI apply(@Nullable Object from) {
> + checkArgument(from != null && from instanceof String, "you must
> specify a region, as a String argument");
If `from` can't be null don't declare it `@Nullable`.
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