abstract class ContextReferenceExtractor {
private static final Logger LOG = LoggerFactory.getLogger(ContextReferenceExtractor.class);
private static final ContextReferenceExtractor NULL_EXTRACTOR = new ContextReferenceExtractor() {
abstract class ContextReferenceExtractor {
private static final Logger LOG = LoggerFactory.getLogger(ContextReferenceExtractor.class);
private static final ContextReferenceExtractor NULL_EXTRACTOR = new ContextReferenceExtractor() {