67 lines
2.2 KiB
C#
67 lines
2.2 KiB
C#
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//
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// OrderedEnumerable.cs
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//
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// Authors:
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// Marek Safar <marek.safar@gmail.com>
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// Jb Evain <jbevain@novell.com>
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//
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// Copyright (C) 2007 - 2008 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Collections;
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using System.Collections.Generic;
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namespace System.Linq {
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abstract class OrderedEnumerable<TElement> : IOrderedEnumerable<TElement> {
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IEnumerable<TElement> source;
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protected OrderedEnumerable (IEnumerable<TElement> source)
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{
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this.source = source;
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}
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IEnumerator IEnumerable.GetEnumerator ()
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{
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return GetEnumerator ();
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}
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public IEnumerator<TElement> GetEnumerator ()
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{
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return Sort (source).GetEnumerator ();
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}
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public abstract SortContext<TElement> CreateContext (SortContext<TElement> current);
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protected abstract IEnumerable<TElement> Sort (IEnumerable<TElement> source);
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public IOrderedEnumerable<TElement> CreateOrderedEnumerable<TKey> (
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Func<TElement, TKey> selector, IComparer<TKey> comparer, bool descending)
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{
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return new OrderedSequence<TElement, TKey> (this, source, selector, comparer,
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descending ? SortDirection.Descending : SortDirection.Ascending);
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}
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}
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}
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