protected Map<String, String> fieldRuleMap = new LinkedHashMap<>();

    /** a flag to trim a space characters. */
    protected boolean trimSpaceEnabled = true;

    protected String charsetName = Constants.UTF_8;

    /**
     * Class type returned by getData() method. The default is null(XML content
     * of String).
     */
    protected Class<?> dataClass = null;

    /**
     * Simply converts the given content to an xml string.
     *
     * @param content the object to convert
     * @return the xml string representation
     * @throws XmlWriterException if an error occurs during the transformation
     * @see #fromXmlString(String)
     */
    @Nonnull
    default String toXmlString(@Nonnull T content) throws XmlWriterException {
        StringWriter sw = new StringWriter();

    public FileAuthenticationCB acceptPK(String id) {
        assertObjectNotNull("id", id);
        BsFileAuthenticationCB cb = this;
        cb.query().docMeta().setId_Equal(id);
        return (FileAuthenticationCB) this;
    }

    @Override
    public void acceptPrimaryKeyMap(Map<String, ? extends Object> primaryKeyMap) {
        acceptPK((String) primaryKeyMap.get("_id"));
    }

    public PathMappingCB acceptPK(String id) {
        assertObjectNotNull("id", id);
        BsPathMappingCB cb = this;
        cb.query().docMeta().setId_Equal(id);
        return (PathMappingCB) this;
    }

    @Override
    public void acceptPrimaryKeyMap(Map<String, ? extends Object> primaryKeyMap) {
        acceptPK((String) primaryKeyMap.get("_id"));
    }

    public RelatedContentCB acceptPK(String id) {
        assertObjectNotNull("id", id);
        BsRelatedContentCB cb = this;
        cb.query().docMeta().setId_Equal(id);
        return (RelatedContentCB) this;
    }

    @Override
    public void acceptPrimaryKeyMap(Map<String, ? extends Object> primaryKeyMap) {
        acceptPK((String) primaryKeyMap.get("_id"));
    }

    public ClickLogCB acceptPK(String id) {
        assertObjectNotNull("id", id);
        BsClickLogCB cb = this;
        cb.query().docMeta().setId_Equal(id);
        return (ClickLogCB) this;
    }

    @Override
    public void acceptPrimaryKeyMap(Map<String, ? extends Object> primaryKeyMap) {
        acceptPK((String) primaryKeyMap.get("_id"));
    }

    final Function<String, String> removeFirst = new RemoveFirstFunction();

    suite.addTest(
        ListTestSuiteBuilder.using(
                new TestStringListGenerator() {
                  @Override
                  protected List<String> create(String[] elements) {
                    List<String> fromList = Lists.newArrayList();
                    for (String element : elements) {

    final Function<String, String> removeFirst = new RemoveFirstFunction();

    suite.addTest(
        ListTestSuiteBuilder.using(
                new TestStringListGenerator() {
                  @Override
                  protected List<String> create(String[] elements) {
                    List<String> fromList = Lists.newArrayList();
                    for (String element : elements) {

    }

    /**
     * Decodes the supplied Base-64 encoded string.
     *
     * @param string The Base-64 encoded string that is to be decoded.
     * @return A <code>byte[]</code> containing the decoded data block.
     */
    public static byte[] decode(String string) {
        int length = string.length();
        if (length == 0) return new byte[0];
        int pad = (string.charAt(length - 2) == '=') ? 2 :

    }

    public String getType() {
        return metadata.getRemoteFilename();
    }

    private String emptify(String string) {
        return (string != null) ? string : "";
    }

    public File getFile() {
        return null;
    }

    public MetadataBridge setFile(File file) {
        return this;
    }

    @Override
    public Path getPath() {
        return null;
    }