> + this.sourceMac = sourceMac;
> + return self();
> + }
> +
> + public B targetIp(String targetIp) {
> + this.targetIp = targetIp;
> + return self();
> + }
> +
> + public abstract B self();
> +
> + public abstract D build();
> +
> + protected void checkPortRange() {
> + checkArgument((portRangeEnd == null && portRangeStart == null)
> + || (portRangeEnd != null && portRangeStart != null), "Port
> range must be both present or null");
Oooh clever. That's something I need to remember
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