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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.
/*============================================================
**
**
**
**
**
** Purpose: Default IComparer implementation.
**
**
===========================================================*/
namespace System.Collections {
using System;
using System.Globalization;
using System.Runtime.Serialization;
using System.Diagnostics.Contracts;
[Serializable]
internal sealed class Comparer : IComparer , ISerializable
{
private CompareInfo m_compareInfo;
public static readonly Comparer Default = new Comparer(CultureInfo.CurrentCulture);
public static readonly Comparer DefaultInvariant = new Comparer(CultureInfo.InvariantCulture);
private const String CompareInfoName = "CompareInfo";
private Comparer() {
m_compareInfo = null;
}
public Comparer(CultureInfo culture) {
if (culture==null) {
throw new ArgumentNullException(nameof(culture));
}
Contract.EndContractBlock();
m_compareInfo = culture.CompareInfo;
}
private Comparer(SerializationInfo info, StreamingContext context) {
m_compareInfo = null;
SerializationInfoEnumerator enumerator = info.GetEnumerator();
while( enumerator.MoveNext()) {
switch( enumerator.Name) {
case CompareInfoName:
m_compareInfo = (CompareInfo) info.GetValue(CompareInfoName, typeof(CompareInfo));
break;
}
}
}
// Compares two Objects by calling CompareTo. If a ==
// b,0 is returned. If a implements
// IComparable, a.CompareTo(b) is returned. If a
// doesn't implement IComparable and b does,
// -(b.CompareTo(a)) is returned, otherwise an
// exception is thrown.
//
public int Compare(Object a, Object b) {
if (a == b) return 0;
if (a == null) return -1;
if (b == null) return 1;
if (m_compareInfo != null) {
String sa = a as String;
String sb = b as String;
if (sa != null && sb != null)
return m_compareInfo.Compare(sa, sb);
}
IComparable ia = a as IComparable;
if (ia != null)
return ia.CompareTo(b);
IComparable ib = b as IComparable;
if (ib != null)
return -ib.CompareTo(a);
throw new ArgumentException(Environment.GetResourceString("Argument_ImplementIComparable"));
}
public void GetObjectData(SerializationInfo info, StreamingContext context) {
if (info==null) {
throw new ArgumentNullException(nameof(info));
}
Contract.EndContractBlock();
if( m_compareInfo != null) {
info.AddValue(CompareInfoName, m_compareInfo);
}
}
}
}
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