> +import com.google.common.base.Function;
> +import com.google.common.base.Supplier;
> +
> +@Singleton
> +public class VersionAwareRegionToEndpoint implements Function<Object, URI> {
> +
> + private final Supplier<Map<String, Supplier<URI>>>
> regionToEndpointSupplier;
> +
> + @Inject
> + public VersionAwareRegionToEndpoint(@Region Supplier<Map<String,
> Supplier<URI>>> regionToEndpointSupplier) {
> + this.regionToEndpointSupplier = checkNotNull(regionToEndpointSupplier,
> "regionToEndpointSupplier");
> + }
> +
> + @Override
> + public URI apply(@Nullable Object from) {
> + checkArgument(from != null && from instanceof String, "you must
> specify a region, as a String argument");
Note: Should also be fixed in RegionToEndpoint, then.
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