addTraverserFactory("code-source",
                (url, rootPackage, rootDir) -> new JarFileTraverser(URLUtil.create("jar:file:" + url.getPath()), rootPackage, rootDir));
        addTraverserFactory("vfszip", VfsZipTraverser::new);
    }

    /**
     * Adds a {@link TraverserFactory}.
     *
     * @param protocol
     *            The URL protocol. Must not be {@literal null} or empty.
     * @param factory