final String userCode = userInfoHelper.getUserCode();

                        if (StringUtil.isBlank(userCode)) {
                            throw new WebApiException(HttpServletResponse.SC_BAD_REQUEST, "No user session.");
                        }
                        if (StringUtil.isBlank(favoriteUrl)) {
                            throw new WebApiException(HttpServletResponse.SC_BAD_REQUEST, "URL is null.");

    protected String denyPrefix = "(deny)";

    @Resource
    protected SystemHelper systemHelper;

    public String encode(final String value) {
        if (StringUtil.isBlank(value)) {
            return null;
        }

        String permission = value.trim();
        String lower = permission.toLowerCase(Locale.ROOT);
        final String aclPrefix;

    }

    @Override
    public String customizeActionMappingRequestPath(final String requestPath) {
        if (StringUtil.isBlank(requestPath)) {
            return null;
        }
        final String virtualHostKey = ComponentUtil.getVirtualHostHelper().getVirtualHostKey();
        if (StringUtil.isBlank(virtualHostKey)) {
            return null;
        }
        final String prefix = "/" + virtualHostKey;

    }

    private AuthScope getAuthScope() {
        if (StringUtil.isBlank(getHostname())) {
            return AuthScope.ANY;
        }

        int p;
        if (getPort() == null) {
            p = AuthScope.ANY_PORT;
        } else {
            p = getPort();
        }

        String r = getAuthRealm();
        if (StringUtil.isBlank(r)) {
            r = AuthScope.ANY_REALM;
        }

     */
    @Test
    public void testIsBlank() throws Exception {
        assertEquals("1", true, StringUtil.isBlank(" "));
        assertEquals("2", true, StringUtil.isBlank(""));
        assertEquals("3", false, StringUtil.isBlank("a"));
        assertEquals("4", false, StringUtil.isBlank(" a "));
    }

    /**
     * @throws Exception
     */
    @Test

        final String url = DocumentUtil.getValue(doc, fessConfig.getIndexFieldThumbnail(), String.class);
        if (StringUtil.isBlank(form.queryId) || StringUtil.isBlank(url) || !thumbnailSupport) {
            // 404
            throw responseManager.new404("Thumbnail for " + form.docId + " is not found.");
        }

                        logger.debug("Loaded KeyMatch Boost Query: {}", boolQuery);
                    }
                    String virtualHost = keyMatch.getVirtualHost();
                    if (StringUtil.isBlank(virtualHost)) {
                        virtualHost = StringUtil.EMPTY;
                    }
                    Map<String, List<Tuple3<String, QueryBuilder, ScoreFunctionBuilder<?>>>> queryMap = keyMatchQueryMap.get(virtualHost);

            throw new PluginException("Failed to delete the artifact " + fileName, e);
        }
    }

    public Artifact getArtifact(final String name, final String version) {
        if (StringUtil.isBlank(name) || StringUtil.isBlank(version)) {
            return null;
        }
        for (final Artifact artifact : getAvailableArtifacts(ArtifactType.getType(name))) {

            }
            if (entity.getTerm().startsWith(regexPrefix)) {
                final String regex = entity.getTerm().substring(regexPrefix.length());
                if (StringUtil.isBlank(regex)) {
                    logger.warn("Unknown regex pattern: {}", entity.getTerm());
                } else {
                    pair.getSecond().add(new Pair<>(Pattern.compile(regex), entity.getContent()));

            content = extractData.getContent();
            if (fessConfig.isCrawlerDocumentFileIgnoreEmptyContent() && StringUtil.isBlank(content)) {
                return null;
            }
            if (getLogger().isDebugEnabled()) {
                getLogger().debug("ExtractData: {}", extractData);
            }
            // meta