InAppUpdates InAppUpdateStatusIterator abstract class pt1

InAppUpdateStatusIterator.kt

abstract class InAppUpdateStatusIterator(
    private val appUpdateInfoWrapper: AppUpdateInfoWrapper,
    private val definitions: AppUpdateInfoDefinitions
) {

    suspend fun getInAppUpdateStatus(): Resource<InAppUpdateStatus> {
        val resourceDefinitions = appUpdateInfoWrapper.getAppUpdateInfo().mapNotNull { appUpdatePertinentInfo ->
            definitions.apply {
                setupAppUpdatePertinentInfo(appUpdatePertinentInfo)
            }
        }
        return resourceDefinitions.inAppUpdateStateWrapper()
    }

    private fun Resource<AppUpdateInfoDefinitions>.inAppUpdateStateWrapper(): Resource<InAppUpdateStatus> {
        return mapNotNull { definitions ->
            getSuccessInAppUpdateStatus(definitions)
        }
    }

    abstract fun getSuccessInAppUpdateStatus(definitions: AppUpdateInfoDefinitions): InAppUpdateStatus

}

//mapNotNull é um extension de Resource, apenas para conhecimento pessoal:
inline fun <R> mapNotNull(mapBlock: (T) -> R?): Resource<R> {
    return map {
        if (it != null) {
            mapBlock(it)
        } else null
    }
}

inline fun <R> map(mapBlock: (T?) -> R?): Resource<R> {
    return when (this) {
        is Error -> error(throwable)
        is Loading -> loading()
        is Success -> {
            val r = mapBlock(data)
            success(r)
        }
    }
}