> +         return this;
> +      }
> +   }
> +
> +   /**
> +    * Create and Update options - extend the domain class, passed to API 
> update and create calls.
> +    * Essentially the same as the domain class. Ensure validation and safe 
> typing.
> +    */
> +   public static class CreateOptions extends Rule {
> +      private CreateOptions(Rule rule) {
> +         super(rule);
> +         checkNotNull(rule.getDirection(), "direction should not be null");
> +         checkNotNull(rule.getSecurityGroupId(), "security group id should 
> not be null");
> +         checkState(rule.getPortRangeMax()>= rule.getPortRangeMin(),
> +               "port range max should be greater than or equal to port range 
> min");
> +         checkState(rule.getRemoteGroupId()==null || 
> rule.getRemoteIpPrefix()==null,

Again, `checkArg`? And spaces around the `==`?

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