5 // Jérémie "Garuma" Laval <jeremie.laval@gmail.com>
7 // Copyright (c) 2010 Jérémie "Garuma" Laval
9 // Permission is hereby granted, free of charge, to any person obtaining a copy
10 // of this software and associated documentation files (the "Software"), to deal
11 // in the Software without restriction, including without limitation the rights
12 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
13 // copies of the Software, and to permit persons to whom the Software is
14 // furnished to do so, subject to the following conditions:
16 // The above copyright notice and this permission notice shall be included in
17 // all copies or substantial portions of the Software.
19 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
22 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
30 using System.Threading;
31 using System.Collections.Generic;
32 using System.Collections.Concurrent;
34 namespace System.Linq.Parallel.QueryNodes
36 internal class QueryReverseNode<TSource> : QueryStreamNode<TSource, TSource>
38 ParallelQuery<TSource> source;
40 public QueryReverseNode (ParallelQuery<TSource> source)
41 : base (source.Node, false)
46 internal override IEnumerable<TSource> GetSequential ()
48 return Parent.GetSequential ().Reverse ();
51 // As stated in the doc, in this case we do nothing
52 internal override IList<IEnumerable<TSource>> GetEnumerables (QueryOptions options)
54 return Parent.GetEnumerables (options);
57 internal override IList<IEnumerable<KeyValuePair<long, TSource>>> GetOrderedEnumerables (QueryOptions options)
59 ReverseList<TSource> reversed = new ReverseList<TSource> (source.ToListOrdered ());
60 OrderablePartitioner<TSource> partitioner = ParallelPartitioner.CreateForStrips (reversed, 1);
62 return WrapHelper.Wrap (partitioner.GetOrderablePartitions (options.PartitionCount));