Android paging Network + Database 4 snippet

.kt

/**
 * For a clean architecture
 * encapsulated all methods for paginate in this class
 *
 * For more information
 * @see https://github.com/googlesamples/android-architecture-components/blob/master/PagingWithNetworkSample
 **/
interface Listing<T> {
fun getBoundaryCallback(): LiveData<GenericBoundaryCallback<T>>
 fun getDataSource(): LiveData<PagedList<CharacterModel>>
 fun getNetworkState(): LiveData<NetworkState> = Transformations.switchMap(getBoundaryCallback()) { it.networkState }
}