final Map<String, String> map = new HashMap<>();
                            map.put(ExtractData.RESOURCE_NAME_KEY, filename);
                            buf.append(extractor.getText(new IgnoreCloseInputStream(ais), map).getContent());
                            buf.append('\n');
                        } catch (final Exception e) {
                            if (logger.isDebugEnabled()) {

                                    // partial results
                                    final StringBuilder buf = new StringBuilder(1000);
                                    buf.append("[SEARCH TIMEOUT] {\"exec_time\":")
                                            .append(execTime)//
                                            .append(",\"request\":")

                            map.put(ExtractData.RESOURCE_NAME_KEY, filename);
                            buf.append(extractor.getText(new IgnoreCloseInputStream(ais), map).getContent());
                            buf.append('\n');
                        } catch (final Exception e) {
                            if (logger.isDebugEnabled()) {

        // normalize
        final StringBuilder buf = new StringBuilder(1000);
        for (int i = 0; i < configPath.length(); i++) {
            final char c = configPath.charAt(i);
            if (c == '\\') {
                buf.append('/');
            } else if (c == ' ') {
                buf.append("%20");
            } else if (CharUtil.isUrlChar(c)) {
                buf.append(c);
            } else {

        // content
        final StringBuilder buf = new StringBuilder(content.length() + 1000);
        if (fessConfig.isCrawlerDocumentFileAppendBodyContent()) {
            buf.append(content);
        }
        if (fessConfig.isCrawlerDocumentFileAppendMetaContent()) {
            if (buf.length() > 0) {
                buf.append(' ');
            }
            buf.append(contentMeta);
        }

        validate(form, messages -> {}, () -> asListHtml(null));
        verifyTokenKeep(() -> asListHtml(this::saveToken));

        String header = null;
        final StringBuilder buf = new StringBuilder(1000);
        try (final BufferedReader reader = new BufferedReader(new InputStreamReader(form.requestFile.getInputStream(), Constants.UTF_8))) {
            header = ReaderUtil.readLine(reader);

                    if (StringUtil.isNotBlank(normalizePath)) {
                        buf.append(normalizePath);
                    }
                }
                this.includedPaths = Pattern.compile(buf.toString());
            }

            if (StringUtil.isNotBlank(excludedPaths)) {
                final StringBuilder buf = new StringBuilder(100);
                char split = 0;

                    for (final StringBuilder buf : bufList) {
                        buf.append(alphabets[j]);
                    }
                } else if (bufList.size() < getMaxReadingNum()) {
                    final List<StringBuilder> tmpBufList = deepCopyBufList(originBufList);
                    for (final StringBuilder buf : tmpBufList) {
                        buf.append(alphabets[j]);
                    }

        final StringBuilder buf = new StringBuilder();
        clientFactory.addClient("test:.*", new CrawlerClient() {
            @Override
            public ResponseData execute(final RequestData request) {
                return null;
            }

            @Override
            public void setInitParameterMap(final Map<String, Object> params) {
                buf.append("value=").append(params.get("hoge"));

    default String getLdapAdminUserSecurityPrincipal(final String name) {
        final StringBuilder buf = new StringBuilder(100);
        buf.append(String.format(getLdapAdminUserFilter(), name));
        if (StringUtil.isNotBlank(getLdapAdminUserBaseDn())) {
            buf.append(',').append(getLdapAdminUserBaseDn());
        }
        return buf.toString();
    }

    String getLdapAdminRoleObjectClasses();