code: static List<DatastoreKey> toDatastoreKeys(List<Key> nativeKeys) {
      if (nativeKeys == null || nativeKeys.isEmpty()) {
        return new ArrayList<>(0);
      }
      List<DatastoreKey> datastoreKeys = new ArrayList<>(nativeKeys.size());
      for (Key nativeKey : nativeKeys) {
        datastoreKeys.add(new DefaultDatastoreKey(nativeKey));
      }
      return datastoreKeys;
    }
docs: Converts/wraps the given native keys into a list of {@link DatastoreKey} objects.
  
  @param nativeKeys
  the native keys
  @return a list of {@link DatastoreKey} objects.