springMVC custom PrefixArgumentResolver

public class PrefixArgumentResolver implements HandlerMethodArgumentResolver{ //WebArgumentResolver{

    @Override

    public boolean supportsParameter(MethodParameter mp) {

        return mp.hasParameterAnnotation(ReqParamPrefix.class) && !Collection.class.isAssignableFrom(mp.getParameterType());

    }

    @Override

    public Object resolveArgument(MethodParameter mp, ModelAndViewContainer mavc, NativeWebRequest req, WebDataBinderFactory bf) throws Exception {

        Object target = mp.getParameterType().newInstance();

        String prefix = mp.getParameterAnnotation(ReqParamPrefix.class).value(), separator = ".";

        MutablePropertyValues pvs = new ServletRequestParameterPropertyValues(req.getNativeRequest(ServletRequest.class), prefix, separator);

        WebDataBinder binder = new WebDataBinder(target);

        binder.bind(pvs);

        return target;

    }

    

}