public class Logo {
    private String name;
    private String provider_name;
    private String url;
    private String average_width;

{
    "logo": {
        "id": 1,
        "name": "Logo_optim.png",
        "provider_name": "some name of provider",
        "info": "company_logo",
        "delta": {
            "reference": {
                "url": "url for this image",
                "width": 536,
                "height": 379
            },
            "average": {
                "url": "url for this image",
                "width": 239,
                "height": 169
            }
        }
    }
}

public class LogoAdapteJsonDeserilizer implements JsonDeserializer<Logo > {

    @Override
    public Logo deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
        // mapping code here
        return logo ;
    }
}

public class Logo {
    @Map(name)
    private String name;
    @Map(provider_name)
    private String provider_name;
    @Map(delta.reference.average.url)
    private String url;
    @Map(delta.reference.average.width)
    private String average_width;