while (matcher.find()) {
            MatchResult xrefMatcher = matcher.toMatchResult();
            String link = xrefMatcher.group(1);
            String fileName = getFileName(link, sourceFile);
            File referencedFile = new File(getDocumentationRoot().get().getAsFile(), fileName);
            if (!referencedFile.exists()) {

        }

        @Override
        public int getFileSize() {
            return (int) fileItem.getSize();
        }

        @Override
        public String getFileName() {
            return getBaseFileName(fileItem.getName());
        }

        protected String getBaseFileName(final String filePath) {
            final String fileName = new File(filePath).getName();

     * @param encoding the character encoding (currently unused in this method)
     * @return the extracted filename, or empty string if none found
     */
    default String getFileName(final String url, final String encoding) {
        if (StringUtil.isBlank(url)) {
            return StringUtil.EMPTY;
        }

        int idx = 0;
        String u = url;

     *
     * @param artifact the artifact to install
     * @throws PluginException if installation fails
     */
    protected void install(final Artifact artifact) {
        final String fileName = artifact.getFileName();
        final String url = artifact.getUrl();
        if (StringUtil.isBlank(url)) {
            throw new PluginException("url is blank: " + artifact.getName());
        }

            if (buf.length() > 0) {
                buf.append(' ');
            }
            buf.append(contentMeta);
        }
        final String fileName = getFileName(url, urlEncoding);
        if (StringUtil.isNotBlank(fileName) && fessConfig.isCrawlerDocumentAppendFilename()) {
            buf.append(' ').append(fileName);
        }

        assertEquals(exp, transformer.getFileName(url, Constants.UTF_8));

        url = "http://example.com/" + encodeUrl("#") + "/@@folder/test.txt";
        exp = "test.txt";
        assertEquals(exp, transformer.getFileName(url, Constants.UTF_8));

        url = "http://example.com/test%20+%2B.txt";
        exp = "test  +.txt";
        assertEquals(exp, transformer.getFileName(url, Constants.UTF_8));

            try (Stream<Path> stream = Files.list(logDirPath)) {
                stream.filter(entry -> isLogFilename(entry.getFileName().toString())).sorted().forEach(filePath -> {
                    final Map<String, Object> map = new HashMap<>();
                    final String name = filePath.getFileName().toString();
                    map.put("id", Base64.getUrlEncoder().encodeToString(name.getBytes(StandardCharsets.UTF_8)));

     */
    protected Path getJarFile(final Artifact artifact) {
        final Path jarPath = ResourceUtil.getPluginPath(artifact.getFileName());
        if (!Files.exists(jarPath)) {
            throw new ThemeException(artifact.getFileName() + " does not exist.");
        }
        return jarPath;
    }

        try {
            uploadObject(getObjectName(form.path, form.uploadFile.getFileName()), form.uploadFile);
        } catch (final StorageException e) {
            logger.warn("Failed to upload {}", form.uploadFile.getFileName(), e);
            throwValidationError(messages -> messages.addErrorsStorageFileUploadFailure(GLOBAL, form.uploadFile.getFileName()),
                    () -> asListHtml(encodeId(form.path)));

        }

        final String body = getSingleNodeValue(document, getContentXpath(fessConfig, xpathConfigMap),
                prunedContent ? node -> pruneNode(node, crawlingConfig) : node -> node);
        final String fileName = getFileName(url, urlEncoding);
        putResultDataContent(dataMap, responseData, fessConfig, crawlingConfig, documentHelper, body, fileName);
        if ((fieldConfigs.getConfig(fessConfig.getIndexFieldCache())