102 lines
3.0 KiB
C#
102 lines
3.0 KiB
C#
//
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// System.Collections.Comparer.cs
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//
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// Authors:
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// Sergey Chaban (serge@wildwestsoftware.com)
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// Sebastien Pouliot <sebastien@ximian.com>
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//
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// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Globalization;
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using System.Runtime.InteropServices;
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using System.Runtime.Serialization;
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using System.Security.Permissions;
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namespace System.Collections
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{
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[ComVisible(true)]
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[Serializable]
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#if INSIDE_CORLIB
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public
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#else
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internal
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#endif
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sealed class Comparer : IComparer, ISerializable {
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public static readonly Comparer Default = new Comparer ();
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public static readonly Comparer DefaultInvariant = new Comparer (CultureInfo.InvariantCulture);
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// This field was introduced for MS kompatibility. see bug #77701
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CompareInfo m_compareInfo;
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private Comparer ()
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{
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//LAMESPEC: This seems to be encoded at runtime while CaseInsensitiveComparer does at creation
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}
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public Comparer (CultureInfo culture)
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{
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if (culture == null)
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throw new ArgumentNullException ("culture");
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m_compareInfo = culture.CompareInfo;
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}
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// IComparer
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public int Compare (object a, object b)
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{
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if (a == b)
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return 0;
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else if (a == null)
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return -1;
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else if (b == null)
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return 1;
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if (m_compareInfo != null) {
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string sa = a as string;
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string sb = b as string;
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if (sa != null && sb != null)
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return m_compareInfo.Compare (sa, sb);
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}
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if (a is IComparable)
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return (a as IComparable).CompareTo (b);
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else if (b is IComparable)
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return -(b as IComparable).CompareTo (a);
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throw new ArgumentException (Locale.GetText ("Neither 'a' nor 'b' implements IComparable."));
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}
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// ISerializable
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[SecurityPermission (SecurityAction.LinkDemand, SerializationFormatter = true)]
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public void GetObjectData (SerializationInfo info, StreamingContext context)
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{
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if (info == null)
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throw new ArgumentNullException ("info");
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info.AddValue ("CompareInfo", m_compareInfo, typeof (CompareInfo));
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}
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}
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}
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