*
   * @param escaper the non-null escaper to test
   */
  public static void assertBasic(Escaper escaper) throws IOException {
    // Escapers operate on characters: no characters, no escaping.
    Assert.assertEquals("", escaper.escape(""));
    // Assert that escapers throw null pointer exceptions.
    try {
      escaper.escape((String) null);

   *
   * @param escaper the non-null escaper to test
   */
  public static void assertBasic(Escaper escaper) throws IOException {
    // Escapers operate on characters: no characters, no escaping.
    Assert.assertEquals("", escaper.escape(""));
    // Assert that escapers throw null pointer exceptions.
    try {
      escaper.escape((String) null);

   * | `http://square`               | null                 |
   * | `http://co.uk`                | null                 |
   * | `http://localhost`            | null                 |
   * | `http://127.0.0.1`            | null                 |
   */
  fun topPrivateDomain(): String? {
    return if (host.canParseAsIpAddress()) {
      null
    } else {

        ElevateWordCQ cq = new ElevateWordCQ();
        if (queryLambda != null) {
            queryLambda.callback(cq);
        }
        FilterAggregationBuilder builder = regFilterA(name, cq.getQuery());
        if (opLambda != null) {
            opLambda.callback(builder);
        }
        if (aggsLambda != null) {
            ElevateWordCA ca = new ElevateWordCA();
            aggsLambda.callback(ca);

        RelatedContentCQ cq = new RelatedContentCQ();
        if (queryLambda != null) {
            queryLambda.callback(cq);
        }
        FilterAggregationBuilder builder = regFilterA(name, cq.getQuery());
        if (opLambda != null) {
            opLambda.callback(builder);
        }
        if (aggsLambda != null) {
            RelatedContentCA ca = new RelatedContentCA();
            aggsLambda.callback(ca);

            this.thread = null;
            this.state = 6;
            break;
        default:
            log.error("Invalid state: " + this.state);
            this.thread = null;
            this.state = 6;
            break;
        }

        if ( ioe != null )
            throw ioe;

        return false;
    }


    @Override

        ClickLogCQ cq = new ClickLogCQ();
        if (queryLambda != null) {
            queryLambda.callback(cq);
        }
        FilterAggregationBuilder builder = regFilterA(name, cq.getQuery());
        if (opLambda != null) {
            opLambda.callback(builder);
        }
        if (aggsLambda != null) {
            ClickLogCA ca = new ClickLogCA();
            aggsLambda.callback(ca);

        RequestHeaderCQ cq = new RequestHeaderCQ();
        if (queryLambda != null) {
            queryLambda.callback(cq);
        }
        FilterAggregationBuilder builder = regFilterA(name, cq.getQuery());
        if (opLambda != null) {
            opLambda.callback(builder);
        }
        if (aggsLambda != null) {
            RequestHeaderCA ca = new RequestHeaderCA();
            aggsLambda.callback(ca);

        BoostDocumentRuleCQ cq = new BoostDocumentRuleCQ();
        if (queryLambda != null) {
            queryLambda.callback(cq);
        }
        FilterAggregationBuilder builder = regFilterA(name, cq.getQuery());
        if (opLambda != null) {
            opLambda.callback(builder);
        }
        if (aggsLambda != null) {
            BoostDocumentRuleCA ca = new BoostDocumentRuleCA();
            aggsLambda.callback(ca);

        if (kid == null) {
            return;
        }

        if (children == null) {
            children = new MetadataTreeNode[nChildren];
        }

        children[index % nChildren] = kid;
    }

    // ------------------------------------------------------------------
    @Override
    public String toString() {
        return md == null ? "no metadata" : md.toString();
    }