package com.test.config;

import com.test.entity.ResponseTemplate;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

/**
 * 用於預處理httpMessageConverter
 */
@ControllerAdvice//作用於controller中使用了註解@RequestMapping的方法
public class DataResponseBodyAdvice implements ResponseBodyAdvice {

    @Override
    public boolean supports(MethodParameter returnType, Class converterType) {

        return true;
    }

    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {

        if(returnType.hasMethodAnnotation(ExceptionHandler.class)) {//處理異常，可以再新增一個異常處理的類，用於處理異常返回格式

            return body;
        } else {

            return new ResponseTemplate(body);
        }
    }
}