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Viewing changes to contrib/ICSharpCode.NRefactory/Utils/KeyComparer.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
Import upstream version 4.0.5+dfsg

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contrib/ICSharpCode.NRefactory/Utils/KeyComparer.cs
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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team
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// 
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this
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// software and associated documentation files (the "Software"), to deal in the Software
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// without restriction, including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
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// to whom the Software is furnished to do so, subject to the following conditions:
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// 
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// The above copyright notice and this permission notice shall be included in all copies or
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// substantial portions of the Software.
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// 
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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using System;
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using System.Collections.Generic;
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namespace ICSharpCode.NRefactory.Utils
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{
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        public static class KeyComparer
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        {
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                public static KeyComparer<TElement, TKey> Create<TElement, TKey>(Func<TElement, TKey> keySelector)
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                {
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                        return new KeyComparer<TElement, TKey>(keySelector, Comparer<TKey>.Default, EqualityComparer<TKey>.Default);
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                }
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        }
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        public class KeyComparer<TElement, TKey> : IComparer<TElement>, IEqualityComparer<TElement>
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        {
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                readonly Func<TElement, TKey> keySelector;
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                readonly IComparer<TKey> keyComparer;
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                readonly IEqualityComparer<TKey> keyEqualityComparer;
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                public KeyComparer(Func<TElement, TKey> keySelector, IComparer<TKey> keyComparer, IEqualityComparer<TKey> keyEqualityComparer)
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                {
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                        this.keySelector = keySelector;
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                        this.keyComparer = keyComparer;
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                        this.keyEqualityComparer = keyEqualityComparer;
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                }
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                public int Compare(TElement x, TElement y)
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                {
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                        return keyComparer.Compare(keySelector(x), keySelector(y));
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                }
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                public bool Equals(TElement x, TElement y)
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                {
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                        return keyEqualityComparer.Equals(keySelector(x), keySelector(y));
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                }
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                public int GetHashCode(TElement obj)
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                {
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                        return keyEqualityComparer.GetHashCode(keySelector(obj));
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                }
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        }
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}