* @param contentType A content type.
     * @param contentEncoding A content encoding.
     * @param pdfPassword A password for a PDF.
     * @return a metadata.
     */
    protected Metadata createMetadata(final String resourceName, final String contentType, final String contentEncoding,
            final String pdfPassword) {
        final Metadata metadata = new Metadata();
        if (StringUtil.isNotEmpty(resourceName)) {