if (!Character.isDigit(hostname.charAt(i))) {
                return false;
            }
        }
        return true;
    }

    /**
     * Lookup <code>hostname</code> and return it's <code>UniAddress</code>. If the
     * <code>possibleNTDomainOrWorkgroup</code> parameter is <code>true</code> an
     * addtional name query will be performed to locate a master browser.

        // Default constructor
    }

    private static final Logger logger = LogManager.getLogger(QueryProcessor.class);

    /**
     * Map of query commands indexed by query class simple names.
     * Used to lookup appropriate command handlers for different query types.
     */
    protected Map<String, QueryCommand> queryCommandMap = new HashMap<>();

    /**
     * List of filters that will be applied during query processing.

            this.roles = roles;
        }

        /**
         * Resets permissions to force recalculation on next getPermissions() call.
         * This is called after asynchronous parent group lookup completes.
         */
        public void resetPermissions() {
            this.permissions = null;
        }
    }

        NbtAddress addr;

        if (name.hexCode == 0x1d && svr == null) {
            svr = CLIENT.baddr; // bit of a hack but saves a lookup
        }
        name.srcHashCode = svr != null ? svr.hashCode() : 0;
        addr = getCachedAddress(name);

        if (addr == null) {
            addr = (NbtAddress) checkLookupTable(name);

            // While we could look up the domain controller/KDC we cannot really make the java kerberos implementation
            // use a KDC of our choice.
            // A potential workaround would be to try to get the server FQDN by reverse lookup, but this might have
            // security implications and also is not how Microsoft does it.

                    dots++;
                    i++;
                }
            }
        }

        return false;
    }

    /**
     * Perform DNS SRV lookup on successively shorter suffixes of name
     * and return successful suffix or throw an UnknownHostException.
     * import javax.naming.*;
     * import javax.naming.directory.*;

                    links = null;
                }

                if (links != null) {
                    final String link = "\\";

                    /* Lookup the domain based DFS root target referral. Note the
                     * path is just "\" and not "\example.com\root".
                     */
                    dr = (DfsReferral) links.map.get(link);

        }
        return SortBuilders.fieldSort(field).order(order);
    }

    /**
     * Checks if the specified field is a search field.
     * Uses O(1) Set lookup for improved performance.
     * @param field The field name to check.
     * @return True if the field is a search field, false otherwise.
     */
    protected boolean isSearchField(final String field) {

        try {
            List<String> results = langConverter.convert("test", "content");
            assertNotNull(results);
        } catch (Exception e) {
            // Null language might cause issues with analyzer lookup
            assertNotNull(e);
        }
    }

    @Test
    public void testConvertWithNumbersAndSymbols() throws IOException {
        // Test convert with numbers and symbols

     * This method handles the resolution of SPNEGO credentials by checking
     * if the user is an admin user or needs to be authenticated through LDAP.
     *
     * @param resolver The credential resolver to use for user lookup
     */
    @Override
    public void resolveCredential(final LoginCredentialResolver resolver) {
        resolver.resolve(SpnegoCredential.class, credential -> {