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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#pragma warning disable 618 // obsolete types
namespace System.Collections
{
internal sealed class CompatibleComparer : IEqualityComparer
{
private readonly IHashCodeProvider _hcp;
private readonly IComparer _comparer;
internal CompatibleComparer(IHashCodeProvider hashCodeProvider, IComparer comparer)
{
_hcp = hashCodeProvider;
_comparer = comparer;
}
internal IHashCodeProvider HashCodeProvider => _hcp;
internal IComparer Comparer => _comparer;
public new bool Equals(object a, object b) => Compare(a, b) == 0;
public int Compare(object a, object b)
{
if (a == b)
return 0;
if (a == null)
return -1;
if (b == null)
return 1;
if (_comparer != null)
{
return _comparer.Compare(a, b);
}
IComparable ia = a as IComparable;
if (ia != null)
{
return ia.CompareTo(b);
}
throw new ArgumentException(SR.Argument_ImplementIComparable);
}
public int GetHashCode(object obj)
{
if (obj == null)
{
throw new ArgumentNullException(nameof(obj));
}
return _hcp != null ?
_hcp.GetHashCode(obj) :
obj.GetHashCode();
}
}
}
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