2 // System.Collections.Comparer.cs
5 // Sergey Chaban (serge@wildwestsoftware.com)
9 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
11 // Permission is hereby granted, free of charge, to any person obtaining
12 // a copy of this software and associated documentation files (the
13 // "Software"), to deal in the Software without restriction, including
14 // without limitation the rights to use, copy, modify, merge, publish,
15 // distribute, sublicense, and/or sell copies of the Software, and to
16 // permit persons to whom the Software is furnished to do so, subject to
17 // the following conditions:
19 // The above copyright notice and this permission notice shall be
20 // included in all copies or substantial portions of the Software.
22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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31 using System.Globalization;
32 using System.Runtime.InteropServices;
34 namespace System.Collections
40 public sealed class Comparer : IComparer
42 public static readonly Comparer Default = new Comparer ();
48 static readonly Comparer DefaultInvariant = new Comparer (CultureInfo.InvariantCulture);
54 //LAMESPEC: This seems to be encoded at runtime while CaseInsensitiveComparer does at creation
62 Comparer (CultureInfo culture)
65 throw new ArgumentNullException ("culture");
72 public int Compare (object a, object b)
81 if (_culture != null) {
82 string sa = a as string;
83 string sb = b as string;
84 if (sa != null && sb != null)
85 return _culture.CompareInfo.Compare (sa, sb);
89 return (a as IComparable).CompareTo (b);
90 else if (b is IComparable)
91 return -(b as IComparable).CompareTo (a);
93 throw new ArgumentException (Locale.GetText ("Neither a nor b Comparable."));