class DstIpExtractorPhcOnly implements FieldExtractor<Ip> {

  @Override
  public Ip getValue(PacketHeaderConstraints constraints, Location srcLocation) {
    String headerDstIp = constraints.getDstIps();
    checkArgument(headerDstIp != null, "destination must be specified");
    return _helper.inferDstIpFromHeaderDstIp(headerDstIp);
  }

  public  DstIpExtractorPhcOnly(IpFieldExtractorContext helper);

}