AlyGsonConverterFactory.java

package com.mcxtzhang.rxjava2demo.retrofit.base.gson;

import com.google.gson.Gson;
import com.google.gson.TypeAdapter;
import com.google.gson.reflect.TypeToken;

import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

import okhttp3.RequestBody;
import okhttp3.ResponseBody;
import retrofit2.Converter;
import retrofit2.Retrofit;

/**
 * A {@linkplain Converter.Factory converter} which uses Gson for JSON.
 * <p>
 * Because Gson is so flexible in the types it supports, this converter assumes that it can handle
 * all types. If you are mixing JSON serialization with something else (such as protocol buffers),
 * you must {@linkplain Retrofit.Builder#addConverterFactory(Converter.Factory) add this instance}
 * last to allow the other converters a chance to see their types.
 */
public final class AlyGsonConverterFactory extends Converter.Factory {
    /**
     * Create an instance using a default {@link Gson} instance for conversion. Encoding to JSON and
     * decoding from JSON (when no charset is specified by a header) will use UTF-8.
     */
    public static AlyGsonConverterFactory create() {
        return create(new Gson());
    }

    /**
     * Create an instance using {@code gson} for conversion. Encoding to JSON and
     * decoding from JSON (when no charset is specified by a header) will use UTF-8.
     */
    public static AlyGsonConverterFactory create(Gson gson) {
        return new AlyGsonConverterFactory(gson);
    }

    private final Gson gson;

    private AlyGsonConverterFactory(Gson gson) {
        if (gson == null) throw new NullPointerException("gson == null");
        this.gson = gson;
    }

    @Override
    public Converter<ResponseBody, ?> responseBodyConverter(Type type, Annotation[] annotations,
                                                            Retrofit retrofit) {
        //我们只关实现从ResponseBody 到 String 的转换，所以其它方法可不覆盖
       //若其它类型我们不处理，返回null就行

    /*TypeAdapter<?> adapter = gson.getAdapter(TypeToken.get(type));
    return new GsonEntityResponseBodyConverter<>(gson, adapter);*/
        //方法 1  自动剥离
        //return new GsonEntityResponseBodyConverter<>(gson, type);
        //方法 2  不自动剥离 但是通过map一个函数去完成
        return new GsonAllResponseBodyConverter<>(gson, type);
    }

    @Override
    public Converter<?, RequestBody> requestBodyConverter(Type type,
                                                          Annotation[] parameterAnnotations, Annotation[] methodAnnotations, Retrofit retrofit) {
        TypeAdapter<?> adapter = gson.getAdapter(TypeToken.get(type));
        return new GsonRequestBodyConverter<>(gson, adapter);
    }
}