> +      ServerWithSecurityGroups instance = serverApi.get().get(instanceId);
> +      if (instance == null) {
> +         return ImmutableSet.of();
> +      }
> +
> +      Set<String> groupNames = instance.getSecurityGroupNames();
> +      Set<? extends SecurityGroupInZone> rawGroups =
> +              
> sgApi.get().list().filter(nameIn(groupNames)).transform(groupToGroupInZone(zone)).toSet();
> +
> +      return ImmutableSet.copyOf(transform(filter(rawGroups, notNull()), 
> groupConverter));
> +   }
> +
> +   @Override
> +   public SecurityGroup getSecurityGroupById(String id) {
> +      checkNotNull(id, "id");
> +      ZoneAndId zoneAndId = ZoneAndId.fromSlashEncoded(id);

[minor] combine the two lines?

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