assertEquals(getRoot() + "Program File", ResourceUtil.getFileName(url));
        url = ResourceUtil.getResource("java/lang/String.class");
        assertNull(ResourceUtil.getFile(url));
    }

    private String getRoot() throws IOException {
        final String root = new File("/").getCanonicalPath().replace('\\', '/');
        if (root.startsWith("/")) {
            return root;

        assertArgumentNotEmpty("encoding", encoding);

        final URL url = ResourceUtil.getResource(path);
        if (url.getProtocol().equals("file")) {
            return readText(URLUtil.toFile(url), encoding);
        }
        final InputStream is = URLUtil.openStream(url);
        try {
            final Reader reader = ReaderUtil.create(new BufferedInputStream(is, DEFAULT_BUF_SIZE), encoding);