5 // Alejandro Serrano "Serras" (trupill@yahoo.es)
6 // Marek Safar <marek.safar@gmail.com>
7 // Jb Evain <jbevain@novell.com>
9 // Copyright (C) 2007 Novell, Inc (http://www.novell.com)
11 // Permission is hereby granted, free of charge, to any person obtaining
12 // a copy of this software and associated documentation files (the
13 // "Software"), to deal in the Software without restriction, including
14 // without limitation the rights to use, copy, modify, merge, publish,
15 // distribute, sublicense, and/or sell copies of the Software, and to
16 // permit persons to whom the Software is furnished to do so, subject to
17 // the following conditions:
19 // The above copyright notice and this permission notice shall be
20 // included in all copies or substantial portions of the Software.
22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
32 using System.Collections;
33 using System.Collections.Generic;
35 namespace System.Linq {
37 class OrderedSequence<TElement, TKey> : OrderedEnumerable<TElement> {
39 OrderedEnumerable<TElement> parent;
41 Func<TElement, TKey> selector;
42 IComparer<TKey> comparer;
43 SortDirection direction;
45 internal OrderedSequence (IEnumerable<TElement> source, Func<TElement, TKey> key_selector, IComparer<TKey> comparer, SortDirection direction)
48 this.selector = key_selector;
49 this.comparer = comparer ?? Comparer<TKey>.Default;
50 this.direction = direction;
53 internal OrderedSequence (OrderedEnumerable<TElement> parent, IEnumerable<TElement> source, Func<TElement, TKey> keySelector, IComparer<TKey> comparer, SortDirection direction)
54 : this (source, keySelector, comparer, direction)
59 public override SortContext<TElement> CreateContext (SortContext<TElement> current)
61 SortContext<TElement> context = new SortSequenceContext<TElement, TKey> (selector, comparer, direction, current);
64 return parent.CreateContext (context);
69 protected override IEnumerable<TElement> Sort (IEnumerable<TElement> source)
71 return QuickSort<TElement>.Sort (source, CreateContext (null));