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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.
//
using System.Diagnostics.Contracts;
namespace System.Collections
{
[Serializable]
internal class CompatibleComparer : IEqualityComparer
{
private IComparer _comparer;
#pragma warning disable 618
private IHashCodeProvider _hcp;
internal CompatibleComparer(IComparer comparer, IHashCodeProvider hashCodeProvider)
{
_comparer = comparer;
_hcp = hashCodeProvider;
}
#pragma warning restore 618
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 new bool Equals(Object a, Object b)
{
return Compare(a, b) == 0;
}
public int GetHashCode(Object obj)
{
if (obj == null)
{
throw new ArgumentNullException(nameof(obj));
}
Contract.EndContractBlock();
if (_hcp != null)
return _hcp.GetHashCode(obj);
return obj.GetHashCode();
}
// These are helpers for the Hashtable to query the IKeyComparer infrastructure.
internal IComparer Comparer
{
get
{
return _comparer;
}
}
// These are helpers for the Hashtable to query the IKeyComparer infrastructure.
#pragma warning disable 618
internal IHashCodeProvider HashCodeProvider
{
get
{
return _hcp;
}
}
#pragma warning restore 618
}
}
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