com.lajospolya.spotifyapiwrapper.internal.HttpResponseHelper Maven / Gradle / Ivy

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This project wraps the Spotify public API in order to allow users to intuitively use it

There is a newer version: 3.0.RELEASE

package com.lajospolya.spotifyapiwrapper.internal;

import com.google.gson.Gson;
import com.lajospolya.spotifyapiwrapper.response.CacheableResponse;

import java.lang.reflect.Type;
import java.net.http.HttpHeaders;
import java.net.http.HttpResponse;

public class HttpResponseHelper
{
    private static final String ETAG_HEADER = "etag";

    private final Gson gson = new Gson();
    public Boolean isClientErrorStatusCode(int statusCode)
    {
        return statusCode / 100 == 4;
    }

    public Boolean isServerErrorStatusCode(int statusCode)
    {
        return statusCode / 100 == 5;
    }

    public  T serializeBody(HttpResponse response, Type type)
    {
        T body = serializeResponseBody(response.body(), type);

        /*
         * when a 304 is returned with an empty body the serialized body becomes null
         * so we don't need to handled caching separately
         */
        setCachableValuesFromHeadersIfCachable(body,response.headers());

        return body;
    }

    private  T serializeResponseBody(String body, Type type)
    {
        if(isStringType(type))
        {
            return (T) body;
        }
        return gson.fromJson(body, type);
    }

    private Boolean isStringType(Type typeOfReturnValue)
    {
        return String.class.getTypeName().equals(typeOfReturnValue.getTypeName());
    }

    private  void setCachableValuesFromHeadersIfCachable(T body, HttpHeaders headers)
    {
        if(body instanceof CacheableResponse)
        {
            headers.firstValue(ETAG_HEADER).ifPresent(((CacheableResponse) body)::setEtag);
        }
    }
}