static public Object transformStringToType(String str_data, Class<?> cl_class) {
		System.out.println("convert " + cl_class.getName());
		if (cl_class == String.class) {
			return str_data;
		} else if ((cl_class == Double.class) || (cl_class == Double.TYPE)) {
			return Double.parseDouble(str_data);
		} else if ((cl_class == Float.class) || (cl_class == Float.TYPE)) {
			return Float.parseFloat(str_data);
		} else if ((cl_class == Integer.class) || (cl_class == Integer.TYPE)) {
			return Integer.parseInt(str_data);
		}

		return null;
	}