public IAds GetObject()
{
    #if UNITY_Android
    if(platform == Amazon)
    return new AmazonAdsController
    else
    return new AndroidAdsController
    #elif UNITY_IOS
    return new IOSAdsController
    #elif UNITY_WP10
    return new WindowsAdsController
}

factoryProducer.GetObject(Application.platform)

GetObject(RuntimePlatform platform)

Dictionary< RuntimePlatform , Action> or Dictionary< RuntimePlatform , IAds>