public boolean containsKey(final String key) {
        return params.containsKey(key);
    }

    public Map<String, Object> asMap() {
        return new ParamMap<>(new HashMap<>(getDataMap(params)));
    }

    protected static Map<String, Object> getDataMap(final Map<String, Object> params) {
        if (params instanceof final ParamMap<String, Object> paramMap) {
            return paramMap.getParent();
        }
        return params;

    public void test_register() {
        RenderData data = new RenderData();

        RenderDataUtil.register(data, "key1", null);
        assertNull(data.getDataMap().get("key1"));

        RenderDataUtil.register(data, "key5", "");
        assertEquals(data.getDataMap().get("key5"), "");

    }

                    || c >= 0x10000 && c <= 0x10FFFF) {
                buf.append(c);
            }
        }
        return buf.toString().trim();
    }

    public static Map<String, Object> getDataMap(final AccessResultData<?> accessResultData) {
        // create input source
        final InputSource is = new InputSource(new ByteArrayInputStream(accessResultData.getData()));

    public Object getData(final AccessResultData<?> accessResultData) {
        if (dataClass == null) {
            return super.getData(accessResultData);
        }

        final Map<String, Object> dataMap = XmlUtil.getDataMap(accessResultData);
        if (Map.class.equals(dataClass)) {
            return dataMap;
        }

        try {
            final Object obj = dataClass.getDeclaredConstructor().newInstance();

                }
                return new String(data, Constants.UTF_8_CHARSET);
            }
        }

        final Map<String, Object> dataMap = XmlUtil.getDataMap(accessResultData);
        if (Map.class.equals(dataClass)) {
            return dataMap;
        }

        try {
            final Object obj = dataClass.getDeclaredConstructor().newInstance();