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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team
//
// 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.Generic;
namespace ICSharpCode.NRefactory.Utils
{
public static class KeyComparer
{
public static KeyComparer<TElement, TKey> Create<TElement, TKey>(Func<TElement, TKey> keySelector)
{
return new KeyComparer<TElement, TKey>(keySelector, Comparer<TKey>.Default, EqualityComparer<TKey>.Default);
}
}
public class KeyComparer<TElement, TKey> : IComparer<TElement>, IEqualityComparer<TElement>
{
readonly Func<TElement, TKey> keySelector;
readonly IComparer<TKey> keyComparer;
readonly IEqualityComparer<TKey> keyEqualityComparer;
public KeyComparer(Func<TElement, TKey> keySelector, IComparer<TKey> keyComparer, IEqualityComparer<TKey> keyEqualityComparer)
{
this.keySelector = keySelector;
this.keyComparer = keyComparer;
this.keyEqualityComparer = keyEqualityComparer;
}
public int Compare(TElement x, TElement y)
{
return keyComparer.Compare(keySelector(x), keySelector(y));
}
public bool Equals(TElement x, TElement y)
{
return keyEqualityComparer.Equals(keySelector(x), keySelector(y));
}
public int GetHashCode(TElement obj)
{
return keyEqualityComparer.GetHashCode(keySelector(obj));
}
}
}
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