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