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package com.feingto.cloud.config.feign;

import com.feingto.cloud.core.json.JSONObjectMapper;
import feign.FeignException;
import feign.Response;
import feign.Util;
import feign.codec.Decoder;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.Reader;
import java.lang.reflect.Type;

/**
 * Jackson 反序列化
 *
 * @author longfei
 */
public class JacksonDecoder implements Decoder {
    private final static JSONObjectMapper mapper = new JSONObjectMapper();

    @Override
    public Object decode(final Response response, Type type) throws IOException, FeignException {
        if (response.status() == 404) return Util.emptyValueOf(type);
        if (response.body() == null) return null;
        Reader reader = response.body().asReader();
        if (!reader.markSupported()) {
            reader = new BufferedReader(reader, 1);
        }
        reader.mark(1);
        if (reader.read() == -1) {
            return null;
        }
        reader.reset();
        return mapper.readValue(reader, mapper.constructType(type));
    }
}