/// <summary>
/// Populates the given <see cref="IResultStream{TDestination}" /> with the results, from the execution of
/// the given <see cref="IQueryableFlowQuery" />, in a streamed fashion.
/// </summary>
/// <typeparam name="TSource">
/// The <see cref="System.Type" /> of the source entity.
/// </typeparam>
/// <typeparam name="TDestination">
/// The <see cref="System.Type" /> of the result.
/// </typeparam>
/// <param name="query">
/// The query.
/// </param>
/// <param name="resultStream">
/// The <see cref="IResultStream{TDestination}" /> to stream the results into.
/// </param>
public static void SelectStream <TSource, TDestination>
(
IQueryableFlowQuery query,
IResultStream <TDestination> resultStream
)
{
Func <object, TDestination> converter = null;
if (query.Constructor != null)
{
converter = ConstructionHelper.GetObjectByExpressionConverter <TDestination>(query.Constructor);
}
if (converter == null)
{
converter = x => (TDestination)x;
}
var streamer = new ResultStreamer <TDestination>(resultStream, converter);
ICriteriaBuilder criteriaBuilder = GetCriteriaBuilder(query);
ICriteria criteria = criteriaBuilder.Build <TSource, TDestination>(query);
criteria.List(streamer);
resultStream.EndOfStream();
}
/// <summary>
/// Creates a regular <see cref="FlowQuerySelection{TDestination}" /> instance.
/// </summary>
/// <param name="query">
/// The query.
/// </param>
/// <typeparam name="TSource">
/// The <see cref="System.Type" /> of the source entity.
/// </typeparam>
/// <typeparam name="TDestination">
/// The <see cref="System.Type" /> of the result.
/// </typeparam>
/// <returns>
/// The created <see cref="FlowQuerySelection{TDestination}" /> instance.
/// </returns>
public static FlowQuerySelection <TDestination> SelectList <TSource, TDestination>(IQueryableFlowQuery query)
where TSource : class
{
ICriteriaBuilder criteriaBuilder = GetCriteriaBuilder(query);
ICriteria criteria = criteriaBuilder.Build <TSource, TDestination>(query);
if (query.Constructor != null)
{
IEnumerable enumerable = query.IsDelayed
? criteria.Future <object>()
: (IEnumerable)criteria.List();
return(new FlowQuerySelection <TDestination>
(
() => ConstructionHelper.GetListByExpression <TDestination>(query.Constructor, enumerable)
));
}
IEnumerable <TDestination> selection = query.IsDelayed
? criteria.Future <TDestination>()
: criteria.List <TDestination>();
// ReSharper disable once PossibleMultipleEnumeration
return(new FlowQuerySelection <TDestination>(() => selection));
}
