CaseInsensitiveHashCodeProvider.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Collections / CaseInsensitiveHashCodeProvider.cs / 1 / CaseInsensitiveHashCodeProvider.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** Class: CaseInsensitiveHashCodeProvider 
**
** 
** Purpose: Designed to support hashtables which require
** case-insensitive behavior while still maintaining case,
** this provides an efficient mechanism for getting the
** hashcode of the string ignoring case. 
**
** 
============================================================*/ 
namespace System.Collections {
//This class does not contain members and does not need to be serializable 
    using System;
    using System.Collections;
    using System.Globalization;
 
    [Serializable]
    [Obsolete("Please use StringComparer instead.")] 
[System.Runtime.InteropServices.ComVisible(true)] 
    public class CaseInsensitiveHashCodeProvider : IHashCodeProvider {
        private TextInfo m_text; 
        private static CaseInsensitiveHashCodeProvider m_InvariantCaseInsensitiveHashCodeProvider = null;

        public CaseInsensitiveHashCodeProvider() {
            m_text = CultureInfo.CurrentCulture.TextInfo; 
        }
 
        public CaseInsensitiveHashCodeProvider(CultureInfo culture) { 
            if (culture==null) {
                throw new ArgumentNullException("culture"); 
            }
            m_text = culture.TextInfo;
        }
 
 		public static CaseInsensitiveHashCodeProvider Default
		{ 
			get 
			{
 				return new CaseInsensitiveHashCodeProvider(CultureInfo.CurrentCulture); 
			}
 		}

      	public static CaseInsensitiveHashCodeProvider DefaultInvariant 
 		{
			get 
 			{ 
                if (m_InvariantCaseInsensitiveHashCodeProvider == null) {
				    m_InvariantCaseInsensitiveHashCodeProvider = new CaseInsensitiveHashCodeProvider(CultureInfo.InvariantCulture); 
                }
                return m_InvariantCaseInsensitiveHashCodeProvider;
			}
		} 

        public int GetHashCode(Object obj) { 
            if (obj==null) { 
                throw new ArgumentNullException("obj");
            } 

            String s = obj as String;
            if (s==null) {
                return obj.GetHashCode(); 
            }
 
            return m_text.GetCaseInsensitiveHashCode(s); 
        }
    } 
}

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