> + break;
> + }
> + }
> + } catch (Exception ex) {
> + throw Throwables.propagate(ex);
> + }
> + if (versionEndpointUri == null)
> + throw new HttpException("Glance endpoint does not
> support API version: " + apiVersion);
> + return versionEndpointUri;
> + }
> + });
> + }
> +
> + @Override
> + public URI apply(Object from) {
> + checkArgument(from != null && from instanceof String, "you must
> specify a zone, as a String argument");
We don't need the `!= null` check, null is not `instanceof String`
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