if (creator != null) {
                creator.register(this);
            }
        } catch (final Exception e) {
            if (logger.isDebugEnabled()) {
                logger.debug("CrawlerClientCreator is unavailable.", e);
            }
        }
    }

    /**
     * Adds a client with a regular expression pattern.

                        w.write(b[i], read, fos);
                    }

                    i = i == 1 ? 0 : 1;
                    off += read;
                }

                if (log.isDebugEnabled()) {
                    log.debug(String.format("Copied a total of %d bytes", off));
                }

                if (dh.isSMB2()) {

                return true;
            }
            // gz
            bis.reset();
            return isValid(new GZIPInputStream(bis), false);
        } catch (final Exception e) {
            if (logger.isDebugEnabled()) {
                logger.debug("Failed to validate a file.", e);
            }
        }
        return false;
    }

    /**
     * Generates SitemapSet instance.
     *

    }

    @Override
    public QueryBuilder execute(final QueryContext context, final Query query, final float boost) {
        if (query instanceof final PhraseQuery phraseQuery) {
            if (logger.isDebugEnabled()) {
                logger.debug("{}:{}", query, boost);
            }
            return convertPhraseQuery(context, phraseQuery, boost);
        }

                }
            } else if (logger.isDebugEnabled()) {
                logger.debug("Failed to access {}", fessConfig.getStorageEndpoint(), e);
            }
        } catch (final Exception e) {
            if (logger.isDebugEnabled()) {
                logger.debug("Failed to access {}", fessConfig.getStorageEndpoint(), e);
            }
        }

                    return client.execute(request);
                } catch (final MaxLengthExceededException e) {
                    throw e;
                } catch (final Exception e) {
                    if (logger.isDebugEnabled()) {
                        logger.debug("Failed to access to {}", request.getUrl(), e);
                    }

                    if (listener != null) {

                            buf.append('\n');
                        } catch (final Exception e) {
                            if (logger.isDebugEnabled()) {
                                logger.debug("Exception in an internal extractor.", e);
                            }
                        }
                    }
                }
            }

         */
        public void awaitTermination() {
            try {
                join();
            } catch (final InterruptedException e) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Interrupted.", e);
                }
            }
        }

        /**
         * Waits for the crawling thread to terminate within a specified time limit.

            return asHtml(virtualHost(path_Login_NewpasswordJsp));
        } catch (final LoginFailureException lfe) {
            if (logger.isDebugEnabled()) {
                logger.debug("Login is failed.", lfe);
            }
            activityHelper.loginFailure(OptionalThing.of(new LocalUserCredential(username, password)));

     */
    @Override
    public QueryBuilder execute(final QueryContext context, final Query query, final float boost) {
        if (query instanceof final FuzzyQuery fuzzyQuery) {
            if (logger.isDebugEnabled()) {
                logger.debug("{}:{}", query, boost);
            }
            return convertFuzzyQuery(context, fuzzyQuery, boost);
        }