@Override
 public Set<String> getObjectNamesMatchingPrefix(String prefix) {
   Log.d(TAG, "Searching planets layer for prefix " + prefix);
   Set<String> results = prefixStore.queryByPrefix(prefix);
   Log.d(TAG, "Got " + results.size() + " results for prefix " + prefix + " in " + getLayerName());
   return results;
 }