84 lines
2.6 KiB
C#
84 lines
2.6 KiB
C#
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// ==++==
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// ==--==
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/*============================================================
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**
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** Class: CaseInsensitiveHashCodeProvider
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**
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** <OWNER>[....]</OWNER>
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**
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**
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** Purpose: Designed to support hashtables which require
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** case-insensitive behavior while still maintaining case,
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** this provides an efficient mechanism for getting the
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** hashcode of the string ignoring case.
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**
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**
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============================================================*/
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namespace System.Collections {
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//This class does not contain members and does not need to be serializable
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using System;
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using System.Collections;
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using System.Globalization;
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using System.Diagnostics.Contracts;
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[Serializable]
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[Obsolete("Please use StringComparer instead.")]
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[System.Runtime.InteropServices.ComVisible(true)]
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public class CaseInsensitiveHashCodeProvider : IHashCodeProvider {
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private TextInfo m_text;
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private static volatile CaseInsensitiveHashCodeProvider m_InvariantCaseInsensitiveHashCodeProvider = null;
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public CaseInsensitiveHashCodeProvider() {
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m_text = CultureInfo.CurrentCulture.TextInfo;
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}
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public CaseInsensitiveHashCodeProvider(CultureInfo culture) {
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if (culture==null) {
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throw new ArgumentNullException("culture");
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}
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Contract.EndContractBlock();
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m_text = culture.TextInfo;
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}
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public static CaseInsensitiveHashCodeProvider Default
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{
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get
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{
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Contract.Ensures(Contract.Result<CaseInsensitiveHashCodeProvider>() != null);
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return new CaseInsensitiveHashCodeProvider(CultureInfo.CurrentCulture);
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}
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}
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public static CaseInsensitiveHashCodeProvider DefaultInvariant
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{
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get
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{
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Contract.Ensures(Contract.Result<CaseInsensitiveHashCodeProvider>() != null);
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if (m_InvariantCaseInsensitiveHashCodeProvider == null) {
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m_InvariantCaseInsensitiveHashCodeProvider = new CaseInsensitiveHashCodeProvider(CultureInfo.InvariantCulture);
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}
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return m_InvariantCaseInsensitiveHashCodeProvider;
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}
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}
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public int GetHashCode(Object obj) {
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if (obj==null) {
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throw new ArgumentNullException("obj");
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}
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Contract.EndContractBlock();
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String s = obj as String;
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if (s==null) {
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return obj.GetHashCode();
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}
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return m_text.GetCaseInsensitiveHashCode(s);
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}
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}
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}
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