109 lines
3.1 KiB
C#
109 lines
3.1 KiB
C#
//
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// System.Collections.CaseInsensitiveComparer.cs
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//
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// Authors:
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// Sergey Chaban (serge@wildwestsoftware.com)
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// Eduardo Garcia Cebollero (kiwnix@yahoo.es)
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// Andreas Nahr (ClassDevelopment@A-SoftTech.com)
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//
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//
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// Copyright (C) 2004 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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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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class CaseInsensitiveComparer : IComparer
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{
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readonly static CaseInsensitiveComparer defaultComparer = new CaseInsensitiveComparer ();
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readonly static CaseInsensitiveComparer defaultInvariantComparer = new CaseInsensitiveComparer (true);
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private CultureInfo culture;
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// Public instance constructor
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public CaseInsensitiveComparer ()
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{
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//LAMESPEC: This seems to be encoded while the object is created while Comparer does this at runtime.
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culture = CultureInfo.CurrentCulture;
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}
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private CaseInsensitiveComparer (bool invariant)
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{
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// leave culture == null
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}
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public CaseInsensitiveComparer (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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if (culture.LCID != CultureInfo.InvariantCulture.LCID)
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this.culture = culture;
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// else leave culture == null
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}
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//
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// Public static properties
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//
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public static CaseInsensitiveComparer Default {
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get {
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return defaultComparer;
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}
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}
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public static CaseInsensitiveComparer DefaultInvariant {
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get {
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return defaultInvariantComparer;
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}
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}
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//
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// IComparer
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//
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public int Compare (object a, object b)
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{
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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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if (culture != null)
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return culture.CompareInfo.Compare (sa, sb, CompareOptions.IgnoreCase);
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else
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// FIXME: We should call directly into an invariant compare once available in string
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return CultureInfo.InvariantCulture.CompareInfo.Compare (sa, sb, CompareOptions.IgnoreCase);
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}
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else
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return Comparer.Default.Compare (a, b);
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}
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}
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}
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