code: public boolean matchesBeacon(Beacon beacon) {
          // All identifiers must match, or the corresponding region identifier must be null.
          for (int i = mIdentifiers.size(); --i >= 0; ) {
              final Identifier identifier = mIdentifiers.get(i);
              Identifier beaconIdentifier = null;
              if (i < beacon.mIdentifiers.size()) {
                  beaconIdentifier = beacon.getIdentifier(i);
              }
              if ((beaconIdentifier == null && identifier != null) ||
                      (beaconIdentifier != null  && identifier != null && !identifier.equals(beaconIdentifier))) {
                  return false;
              }
          }
          if (mBluetoothAddress != null && !mBluetoothAddress.equalsIgnoreCase(beacon.mBluetoothAddress)) {
              return false;
          }
          return true;
      }
docs: Checks to see if an Beacon object is included in the matching criteria of this Region
  @param beacon the beacon to check to see if it is in the Region
  @return true if is covered