juick-spring-www/src/main/java/com/juick/www/helpers/QueryStringResolver.java


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package com.juick.www.helpers;

import org.springframework.core.MethodParameter;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;

import javax.servlet.http.HttpServletRequest;
import java.lang.annotation.Annotation;
import java.util.Optional;

public class QueryStringResolver implements HandlerMethodArgumentResolver {
    @Override
    public boolean supportsParameter(MethodParameter parameter) {
        Annotation[] parameterAnnotations = parameter.getParameterAnnotations();
        for (Annotation parameterAnnotation : parameterAnnotations) {
            if (QueryString.class.isInstance(parameterAnnotation)) {
                return true;
            }
        }

        return false;
    }

    @Override
    public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
        HttpServletRequest request = webRequest.getNativeRequest(HttpServletRequest.class);
        return Optional.ofNullable(request.getQueryString());
    }
}