> +      }
> +
> +      /**
> +       * @see IpPermission#getPorts()
> +       */
> +      public Builder addPort(Integer port) {
> +         this.ports.add(singleton(checkNotNull(port, "port")));
> +         return this;
> +      }
> +
> +      /**
> +       * @see IpPermission#getPorts()
> +       */
> +      public Builder addPortRange(Integer start, Integer end) {
> +         checkState(checkNotNull(start, "start") < checkNotNull(end, "end"),
> +                 "start of range must be lower than end of range");

(and I'm copying that same tweak over to GCE's Firewall.Rule, where this 
snippet came from)

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