/// <summary>
/// Open a dataset as a DryadLinq specialized IQueryable{T}.
/// </summary>
/// <typeparam name="T">The type of the records in the table.</typeparam>
/// <param name="dataSetUri">The name of the dataset. </param>
/// <returns>An IQueryable{T} representing the data.</returns>
public IQueryable <T> FromStore <T>(Uri dataSetUri)
{
ThrowIfDisposed();
DryadLinqQuery <T> q = DataProvider.GetPartitionedTable <T>(this, dataSetUri);
q.CheckAndInitialize(); // force the data-info checks.
return(q);
}
/// <summary>
/// Stores an IEnumerable{T} at a specified location.
/// </summary>
/// <typeparam name="T">The record type of the data.</typeparam>
/// <param name="context">An instance of <see cref="DryadLinqContext"/></param>
/// <param name="source">The data to store.</param>
/// <param name="dataSetUri">The URI of the store location.</param>
/// <param name="metaData">The metadata of the data.</param>
/// <param name="outputScheme">The compression scheme.</param>
/// <param name="isTemp">true if the data is only stored temporarily.</param>
/// <param name="serializer">A stream-based serializer</param>
/// <param name="deserializer">A stream-based deserializer</param>
/// <returns>An instance of IQueryable{T} for the data.</returns>
internal static DryadLinqQuery <T> StoreData <T>(DryadLinqContext context,
IEnumerable <T> source,
Uri dataSetUri,
DryadLinqMetaData metaData,
CompressionScheme outputScheme,
bool isTemp,
Expression <Action <IEnumerable <T>, Stream> > serializer,
Expression <Func <Stream, IEnumerable <T> > > deserializer)
{
string scheme = DataPath.GetScheme(dataSetUri);
DataProvider dataProvider = DataProvider.GetDataProvider(scheme);
dataSetUri = dataProvider.RewriteUri <T>(context, dataSetUri);
dataProvider.Ingress(context, source, dataSetUri, metaData, outputScheme, isTemp, serializer);
DryadLinqQuery <T> res = DataProvider.GetPartitionedTable <T>(context, dataSetUri, deserializer);
res.CheckAndInitialize(); // must initialize
return(res);
}