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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 {
IComparer _comparer;
#pragma warning disable 618
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(Environment.GetResourceString("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("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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