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Official Gyro-n Payments Java SDK

There is a newer version: 0.11.17

package jp.gopay.sdk.utils;

import com.google.gson.annotations.SerializedName;
import retrofit2.Converter;
import retrofit2.Converter.Factory;
import retrofit2.Retrofit;

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

public class EnumConverter extends Factory {

    @Override
    public Converter stringConverter(Type type, Annotation[] annotations, Retrofit retrofit) {
        class GoPayEnumConverter implements Converter{
            @Override
            public String convert(Enum e) throws IOException {
                String value = null;
                try {
                    value = e.getClass().getField(e.name()).getAnnotation(SerializedName.class).value();
                }
                catch(NoSuchFieldException exception){
                    exception.printStackTrace();
                }
                return value;
            }
        }

        Converterconverter = null;
        if(type instanceof Class && ((Class)type).isEnum()){
            converter = new GoPayEnumConverter();
        }
        return converter;
    }

}