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//
// System.Collections.Comparer.cs
//
// Authors:
// Sergey Chaban (serge@wildwestsoftware.com)
// Sebastien Pouliot <sebastien@ximian.com>
//
// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
//
// 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.Globalization;
using System.Runtime.InteropServices;
using System.Runtime.Serialization;
using System.Security.Permissions;
namespace System.Collections
{
#if NET_2_0
[ComVisible(true)]
#endif
[Serializable]
#if INSIDE_CORLIB
public
#else
internal
#endif
sealed class Comparer : IComparer, ISerializable {
public static readonly Comparer Default = new Comparer ();
#if NET_1_1
public
#else
internal
#endif
static readonly Comparer DefaultInvariant = new Comparer (CultureInfo.InvariantCulture);
// This field was introduced for MS kompatibility. see bug #77701
CompareInfo m_compareInfo;
private Comparer ()
{
//LAMESPEC: This seems to be encoded at runtime while CaseInsensitiveComparer does at creation
}
#if NET_1_1
public
#else
internal
#endif
Comparer (CultureInfo culture)
{
if (culture == null)
throw new ArgumentNullException ("culture");
m_compareInfo = culture.CompareInfo;
}
// IComparer
public int Compare (object a, object b)
{
if (a == b)
return 0;
else if (a == null)
return -1;
else 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);
}
if (a is IComparable)
return (a as IComparable).CompareTo (b);
else if (b is IComparable)
return -(b as IComparable).CompareTo (a);
throw new ArgumentException (Locale.GetText ("Neither 'a' nor 'b' implements IComparable."));
}
// ISerializable
[SecurityPermission (SecurityAction.LinkDemand, SerializationFormatter = true)]
public void GetObjectData (SerializationInfo info, StreamingContext context)
{
if (info == null)
throw new ArgumentNullException ("info");
info.AddValue ("CompareInfo", m_compareInfo, typeof (CompareInfo));
}
}
}
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