> checkState(size(ips) > 0, "node does not have IP addresses configured:
> " + node);
> - return ips;
> + return FluentIterable.from(ips);
With this setup, I think we can use a builder:
```
ImmutableSet.Builder<String> ipsBuilder = ImmutableSet.builder();
if (allowedInterfaces.scanPublic) {
ipsBuilder.addAll(node.getPublicAddresses());
}
if (allowedInterfaces.scanPrivate) {
ipsBuilder.addAll(node.getPrivateAddresses());
}
ImmutableSet<String> ips = ipsBuilder.build();
checkState(!ips.isEmpty(), "node does not have IP addresses configured: " +
node);
return FluentIterable.from(ips);
```
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