/**
  * Get a sensor from database, associate the found readouts with it, and save them.
  *
  * @param sen
  * @param readouts
  */
 private void addReadoutsToSensor(Sensor sen, Set<Readout> readouts) {
   Sensor sensor = sensorService.get(sen.getId());
   readouts.forEach(
       r -> {
         r.setSensor(sensor);
       });
   readoutService.save(readouts);
 }
 /**
  * No need to add readouts to the same object, which could be the case when we first read an
  * source.
  *
  * @param s
  * @param sensor
  * @return
  */
 private static boolean equalsButNotTheSameInstance(Sensor s, Sensor sensor) {
   return s.equals(sensor) && s != sensor;
 }