/// <summary>Implements a map-reduce operation.</summary>
/// <typeparam name="TSource">Specifies the type of the source elements.</typeparam>
/// <typeparam name="TMapped">Specifies the type of the mapped elements.</typeparam>
/// <typeparam name="TKey">Specifies the type of the element keys.</typeparam>
/// <typeparam name="TResult">Specifies the type of the results.</typeparam>
/// <param name="source">The source elements.</param>
/// <param name="map">A function used to get an enumerable of target data from a source element.</param>
/// <param name="keySelector">A function used to get a key from target data.</param>
/// <param name="reduce">A function used to reduce a group of elements to an enumerable of results.</param>
/// <returns>The result elements of the reductions.</returns>
public static ParallelQuery <TResult> MapReduce <TSource, TMapped, TKey, TResult>(
this ParallelQuery <TSource> source, Func <TSource, IEnumerable <TMapped> > map,
Func <TMapped, TKey> keySelector, Func <IGrouping <TKey, TMapped>, IEnumerable <TResult> > reduce)
{
return(ParallelEnumerable.SelectMany <TSource, TMapped>(source, map).GroupBy <TMapped, TKey>(keySelector)
.SelectMany <IGrouping <TKey, TMapped>, TResult>(reduce));
}
public static void RunParallelEnumerableExceptionsTests()
{
int[] ints = new int[0];
ParallelQuery <int> pquery = ints.AsParallel();
//AsParallel
Assert.Throws <ArgumentNullException>(() => ((IEnumerable <int>)null).AsParallel());
Assert.Throws <ArgumentNullException>(() => ((IEnumerable)null).AsParallel());
Assert.Throws <ArgumentNullException>(() => ((Partitioner <int>)null).AsParallel());
//AsOrdered
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.AsOrdered((ParallelQuery <int>)null));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.AsOrdered((ParallelQuery)null));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.AsUnordered <int>((ParallelQuery <int>)null));
//With*
Assert.Throws <ArgumentException>(() => ParallelEnumerable.WithExecutionMode(pquery, (ParallelExecutionMode)100));
Assert.Throws <ArgumentException>(() => ParallelEnumerable.WithMergeOptions(pquery, (ParallelMergeOptions)100));
//Obsoleted operators
#pragma warning disable 618 //disable build warnning for Obsoleted methods
Assert.Throws <NotSupportedException>(() => ParallelEnumerable.Zip <int, int, int>(null, (IEnumerable <int>)null, null));
Assert.Throws <NotSupportedException>(() => ParallelEnumerable.Join <int, int, int, int>(null, (IEnumerable <int>)null, null, null, null));
Assert.Throws <NotSupportedException>(() => ParallelEnumerable.Join <int, int, int, int>(null, (IEnumerable <int>)null, null, null, null, null));
Assert.Throws <NotSupportedException>(() => ParallelEnumerable.GroupJoin <int, int, int, int>(null, (IEnumerable <int>)null, null, null, null));
Assert.Throws <NotSupportedException>(() => ParallelEnumerable.GroupJoin <int, int, int, int>(null, (IEnumerable <int>)null, null, null, null, null));
#pragma warning restore 618
//SelectMany
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.SelectMany <int, int, int>(null, (Func <int, int, IEnumerable <int> >)null, null));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.SelectMany <int, int, int>(pquery, (Func <int, int, IEnumerable <int> >)null, null));
//OrderBy
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.OrderBy <int, int>(null, null, null));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.OrderBy <int, int>(pquery, null, null));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.OrderByDescending <int, int>(null, null, null));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.OrderByDescending <int, int>(pquery, null, null));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.ThenBy <int, int>(null, null, null));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.ThenBy <int, int>(pquery.OrderBy(x => x), null, null));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.ThenByDescending <int, int>(null, null, null));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.ThenByDescending <int, int>(pquery.OrderBy(x => x), null, null));
//GroupBy
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.GroupBy <int, int, int>((ParallelQuery <int>)null, i => i, (i, j) => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.GroupBy <int, int, int>(pquery, null, (i, j) => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.GroupBy <int, int, int>(pquery, i => i, (Func <int, IEnumerable <int>, int>)null));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.GroupBy <int, int, int, int>((ParallelQuery <int>)null, i => i, i => i, (i, j) => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.GroupBy <int, int, int, int>(pquery, null, i => i, (i, j) => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.GroupBy <int, int, int, int>(pquery, i => i, null, (i, j) => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.GroupBy <int, int, int, int>(pquery, i => i, i => i, (Func <int, IEnumerable <int>, int>)null));
//Aggregate
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Aggregate <int, int, int>((ParallelQuery <int>)null, 0, (i, j) => i, (i, j) => i, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Aggregate <int, int, int>(pquery, 0, null, (i, j) => i, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Aggregate <int, int, int>(pquery, 0, (i, j) => i, null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Aggregate <int, int, int>(pquery, 0, (i, j) => i, (i, j) => i, null));
//Count
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Count((ParallelQuery <int>)null, i => true));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Count(pquery, null));
//Sum
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Sum((ParallelQuery <int>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Sum((ParallelQuery <int?>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Sum((ParallelQuery <long>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Sum((ParallelQuery <long?>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Sum((ParallelQuery <float>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Sum((ParallelQuery <float?>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Sum((ParallelQuery <double>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Sum((ParallelQuery <double?>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Sum((ParallelQuery <double>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Sum((ParallelQuery <double?>)null, i => i));
//Min
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Min((ParallelQuery <int>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Min((ParallelQuery <int?>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Min((ParallelQuery <long>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Min((ParallelQuery <long?>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Min((ParallelQuery <float>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Min((ParallelQuery <float?>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Min((ParallelQuery <double>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Min((ParallelQuery <double?>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Min((ParallelQuery <double>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Min((ParallelQuery <double?>)null, i => i));
//Max
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Max((ParallelQuery <int>)null));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Max((ParallelQuery <int>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Max((ParallelQuery <int?>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Max((ParallelQuery <long>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Max((ParallelQuery <long?>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Max((ParallelQuery <float>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Max((ParallelQuery <float?>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Max((ParallelQuery <double>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Max((ParallelQuery <double?>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Max((ParallelQuery <double>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Max((ParallelQuery <double?>)null, i => i));
//Average
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Average((ParallelQuery <int>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Average((ParallelQuery <int?>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Average((ParallelQuery <long>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Average((ParallelQuery <long?>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Average((ParallelQuery <float>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Average((ParallelQuery <float?>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Average((ParallelQuery <double>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Average((ParallelQuery <double?>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Average((ParallelQuery <double>)null, i => i));
Assert.Throws <ArgumentNullException>(() => ParallelEnumerable.Average((ParallelQuery <double?>)null, i => i));
}