com.aliyun.datahub.client.http.converter.EmptyBodyConverterFactory Maven / Gradle / Ivy

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package com.aliyun.datahub.client.http.converter;

import com.aliyun.datahub.client.model.BaseResult;
import okhttp3.RequestBody;
import okhttp3.ResponseBody;
import retrofit2.Converter;
import retrofit2.Retrofit;

import javax.annotation.Nullable;
import java.io.IOException;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class EmptyBodyConverterFactory extends Converter.Factory {

    public static EmptyBodyConverterFactory create() {
        return new EmptyBodyConverterFactory();
    }

    @Nullable
    @Override
    public Converter responseBodyConverter(Type type, Annotation[] annotations, Retrofit retrofit) {
        if (!(type instanceof Class)) {
            return null;
        }

        Class cls = (Class) type;
        if (BaseResult.class.isAssignableFrom(cls)) {
            List fields = getAllFields(cls);
            if (fields.size() >= 1) {
                int dataFields = 0;
                for (Field field : fields) {
                    if (!"requestId".equalsIgnoreCase(field.getName()) &&
                            !field.getName().contains("$") &&
                            !Modifier.isStatic(field.getModifiers())) {
                        ++dataFields;
                    }
                }
                if (dataFields == 0) {
                    return new EmptyBodyResponseBodyConverter<>(cls);
                }
            }
        }
        return null;
    }

    @Nullable
    @Override
    public Converter requestBodyConverter(Type type, Annotation[] parameterAnnotations, Annotation[] methodAnnotations, Retrofit retrofit) {
        return null;
    }

    private List getAllFields(Class cls) {
        List fields = new ArrayList<>() ;
        while (cls != null) {
            fields.addAll(Arrays.asList(cls.getDeclaredFields()));
            cls = cls.getSuperclass();
        }
        return fields;
    }

    private static class EmptyBodyResponseBodyConverter implements Converter {
        private Class retCls;

        EmptyBodyResponseBodyConverter(Class cls) {
            this.retCls = cls;
        }

        @Nullable
        @Override
        public T convert(ResponseBody value) throws IOException {
            value.close();
            try {
                return retCls.newInstance();
            } catch (Exception e) {
                return null;
            }
        }
    }
}