2 // System.Collections.Comparer.cs
5 // Sergey Chaban (serge@wildwestsoftware.com)
6 // Sebastien Pouliot <sebastien@ximian.com>
8 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
10 // Permission is hereby granted, free of charge, to any person obtaining
11 // a copy of this software and associated documentation files (the
12 // "Software"), to deal in the Software without restriction, including
13 // without limitation the rights to use, copy, modify, merge, publish,
14 // distribute, sublicense, and/or sell copies of the Software, and to
15 // permit persons to whom the Software is furnished to do so, subject to
16 // the following conditions:
18 // The above copyright notice and this permission notice shall be
19 // included in all copies or substantial portions of the Software.
21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
30 using System.Globalization;
31 using System.Runtime.InteropServices;
32 using System.Runtime.Serialization;
33 using System.Security.Permissions;
35 namespace System.Collections
41 public sealed class Comparer : IComparer, ISerializable {
43 public static readonly Comparer Default = new Comparer ();
49 static readonly Comparer DefaultInvariant = new Comparer (CultureInfo.InvariantCulture);
51 // This field was introduced for MS kompatibility. see bug #77701
52 CompareInfo m_compareInfo;
56 //LAMESPEC: This seems to be encoded at runtime while CaseInsensitiveComparer does at creation
64 Comparer (CultureInfo culture)
67 throw new ArgumentNullException ("culture");
69 m_compareInfo = culture.CompareInfo;
74 public int Compare (object a, object b)
83 if (m_compareInfo != null) {
84 string sa = a as string;
85 string sb = b as string;
86 if (sa != null && sb != null)
87 return m_compareInfo.Compare (sa, sb);
91 return (a as IComparable).CompareTo (b);
92 else if (b is IComparable)
93 return -(b as IComparable).CompareTo (a);
95 throw new ArgumentException (Locale.GetText ("Neither 'a' nor 'b' implements IComparable."));
99 [SecurityPermission (SecurityAction.LinkDemand, SerializationFormatter = true)]
100 public void GetObjectData (SerializationInfo info, StreamingContext context)
103 throw new ArgumentNullException ("info");
105 info.AddValue ("CompareInfo", m_compareInfo, typeof (CompareInfo));