APICallback.java

package example.api;

import android.support.annotation.NonNull;

import retrofit2.Call;
import ru.quiick_commons.api.response.ErrorResponse;
import ru.quiick_commons.logger.Logger;

import okhttp3.ResponseBody;

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

import retrofit2.Callback;
import retrofit2.Converter;
import retrofit2.Response;
import retrofit2.Retrofit;

/**
 * @author alwx (http://alwx.me)
 * @version 1.0
 */
public abstract class APICallback<T> implements Callback<T> {

    public abstract void onSuccess(T response);

    public abstract void onError(@NonNull ErrorResponse errorResponse);

    public abstract void onNetworkError(Throwable t);

    @Override
    public void onResponse(Call<T> call, Response<T> response) {
        if (response.isSuccessful()) {
            onSuccess(response.body());
        } else if (response.code() == 403 || response.code() == 500) {
            onError(new ErrorResponse(response.code(), null));
        } else {
            Retrofit retrofit = API.getRetrofit();
            if (retrofit != null) {
                Converter<ResponseBody, ErrorResponse> errorConverter =
                        retrofit.responseBodyConverter(ErrorResponse.class, new Annotation[0]);
                try {
                    ErrorResponse errorResponse = errorConverter.convert(response.errorBody());
                    if (errorResponse.getError() != null) {
                        onError(errorResponse);
                    } else {
                        Logger.error("Empty error: " + response.errorBody().string());
                    }
                } catch (IOException e) {
                    Logger.error("APICallback exception: " + e);
                }
            }
        }
    }

    @Override
    public void onFailure(Call<T> call, Throwable t) {
        onNetworkError(t);
    }
}