private static ServiceReferenceDTO getServiceReferenceDTO(ServiceReference<?> ref) { if (ref == null) { return null; } Bundle b = ref.getBundle(); if (b == null) { // service has been unregistered return null; } ServiceReferenceDTO dto = new ServiceReferenceDTO(); dto.bundle = b.getBundleId(); String[] keys = ref.getPropertyKeys(); Map<String, Object> properties = newMap(keys.length); for (String k : keys) { Object v = ref.getProperty(k); if (Constants.SERVICE_ID.equals(k)) { dto.id = ((Long) v).longValue(); } properties.put(k, mapValue(v)); } dto.properties = properties; Bundle[] using = ref.getUsingBundles(); final int length = (using == null) ? 0 : using.length; long[] usingBundles = new long[length]; for (int i = 0; i < length; i++) { usingBundles[i] = using[i].getBundleId(); } dto.usingBundles = usingBundles; return dto; }