CaseInsensitiveHashCodeProvider.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Collections / CaseInsensitiveHashCodeProvider.cs / 1305376 / 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;
    using System.Diagnostics.Contracts; 
 
    [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");
            } 
            Contract.EndContractBlock();
            m_text = culture.TextInfo; 
        } 

        public static CaseInsensitiveHashCodeProvider Default 
        {
            get
            {
                Contract.Ensures(Contract.Result() != null); 

                return new CaseInsensitiveHashCodeProvider(CultureInfo.CurrentCulture); 
            } 
        }
 
        public static CaseInsensitiveHashCodeProvider DefaultInvariant
        {
            get
            { 
                Contract.Ensures(Contract.Result() != null);
 
                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"); 
            }
            Contract.EndContractBlock(); 

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

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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