Method create

app/src/main/java/androidx/paging/PagedList.java:197–231

Create a PagedList which loads data from the provided data source on a background thread, posting updates to the main thread. @param dataSource DataSource providing data to the PagedList @param notifyExecutor Thread that will use and consume data from the PagedList. Generally

(@NonNull DataSource<K, T> dataSource,
            @NonNull Executor notifyExecutor,
            @NonNull Executor fetchExecutor,
            @Nullable BoundaryCallback<T> boundaryCallback,
            @NonNull Config config,
            @Nullable K key)

     * @return Newly created PagedList, which will page in data from the DataSource as needed.
     */
    @NonNull
    @SuppressWarnings("WeakerAccess") /* synthetic access */
    static <K, T> PagedList<T> create(@NonNull DataSource<K, T> dataSource,
            @NonNull Executor notifyExecutor,
            @NonNull Executor fetchExecutor,
            @Nullable BoundaryCallback<T> boundaryCallback,
            @NonNull Config config,
            @Nullable K key) {
        if (dataSource.isContiguous() || !config.enablePlaceholders) {
            int lastLoad = ContiguousPagedList.LAST_LOAD_UNSPECIFIED;
            if (!dataSource.isContiguous()) {
                //noinspection unchecked
                dataSource = (DataSource<K, T>) ((PositionalDataSource<T>) dataSource)
                        .wrapAsContiguousWithoutPlaceholders();
                if (key != null) {
                    lastLoad = (Integer) key;
                }
            }
            ContiguousDataSource<K, T> contigDataSource = (ContiguousDataSource<K, T>) dataSource;
            return new ContiguousPagedList<>(contigDataSource,
                    notifyExecutor,
                    fetchExecutor,
                    boundaryCallback,
                    config,
                    key,
                    lastLoad);
        } else {
            return new TiledPagedList<>((PositionalDataSource<T>) dataSource,
                    notifyExecutor,
                    fetchExecutor,
                    boundaryCallback,
                    config,
                    (key != null) ? (Integer) key : 0);
        }
    }

    /**
     * Builder class for PagedList.