assertEquals("", joiner.join(array));

    StringBuilder sb1FromIterable = new StringBuilder();
    assertSame(sb1FromIterable, joiner.appendTo(sb1FromIterable, set));
    assertEquals(0, sb1FromIterable.length());

    StringBuilder sb1FromIterator = new StringBuilder();
    assertSame(sb1FromIterator, joiner.appendTo(sb1FromIterator, set));

    protected void buildInitParamMap(final Map<String, String> paramMap, final String queryKey, final String formKey) {
        if (!paramMap.isEmpty()) {
            final StringBuilder queryBuf = new StringBuilder(100);
            final StringBuilder formBuf = new StringBuilder(100);
            for (final Map.Entry<String, String> entry : paramMap.entrySet()) {
                queryBuf.append('&');

                logger.warn("Failed to send {} to {}.", body, url, e);
            }
        }));
    }

    protected String toSlackMessage(final SMailPostingDiscloser discloser) {
        final StringBuilder buf = new StringBuilder(100);
        buf.append("{\"text\":\"");
        buf.append(LF);
        buf.append(StringEscapeUtils.escapeJson(discloser.getSavedSubject().orElse(StringUtil.EMPTY).trim()));
        buf.append(LF).append("```");

            url = url.replace("smb1:", "file:");
        }

        if (isHttpUrl && isSmbOrFtpUrl) {
            //  smb/ftp->http
            // encode
            final StringBuilder buf = new StringBuilder(url.length() + 100);
            for (final char c : url.toCharArray()) {
                if (CharUtil.isUrlChar(c)) {
                    buf.append(c);
                } else {
                    try {

    /**
     * メッセージを作成します。
     *
     * @param cause
     *            原因
     * @return メッセージ
     */
    protected static String createMessage(final SAXException cause) {
        final StringBuilder buf = new StringBuilder(100);
        buf.append(cause);
        if (cause instanceof SAXParseException) {
            final SAXParseException e = (SAXParseException) cause;
            if (e.getSystemId() != null) {

    }

    private String buildAccessUserTrace(final AccessContextResource resource, final UserTypeSupplier userTypeSupplier,
            final AppTypeSupplier appTypeSupplier) {
        final StringBuilder sb = new StringBuilder();
        sb.append(userTypeSupplier.supply().orElse("_"));
        sb.append(",").append(appTypeSupplier.supply()).append(",").append(resource.getModuleName());
        final String trace = sb.toString();

        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final SystemHelper systemHelper = ComponentUtil.getSystemHelper();

        final StringBuilder resultBuf = new StringBuilder();

        final PingResponse ping = searchEngineClient.ping();
        final int status = ping.getStatus();
        if (systemHelper.isChangedClusterState(status)) {

        final LabelTypeHelper labelTypeHelper = ComponentUtil.getLabelTypeHelper();
        final LanguageHelper languageHelper = ComponentUtil.getLanguageHelper();

        final StringBuilder resultBuf = new StringBuilder();

        try {
            final long count = searchEngineClient.updateByQuery(fessConfig.getIndexDocumentUpdateIndex(), option -> {
                if (queryBuilder != null) {

    assertEquals("", joiner.join(array));

    StringBuilder sb1FromIterable = new StringBuilder();
    assertSame(sb1FromIterable, joiner.appendTo(sb1FromIterable, set));
    assertEquals(0, sb1FromIterable.length());

    StringBuilder sb1FromIterator = new StringBuilder();
    assertSame(sb1FromIterator, joiner.appendTo(sb1FromIterator, set));

        }

        // default
        return FormatType.OTHER;
    }

    protected void write(final String text, final String contentType, final String encoding) {
        final StringBuilder buf = new StringBuilder(50);
        if (contentType == null) {
            buf.append("text/plain");
        } else {
            buf.append(contentType);
        }
        buf.append("; charset=");