Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / MS / Internal / TextFormatting / CultureMapper.cs / 1305600 / CultureMapper.cs
//------------------------------------------------------------------------ // // Copyright (c) Microsoft Corporation. All rights reserved. // // Description: The CultureMapper class implements static methods for mapping // CultureInfo objects from WPF clients to CultureInfo objects // that can be used internally by text formatting code. // // History: // 1-30-2006 : niklasb - Created // //----------------------------------------------------------------------- using System; using System.Globalization; using System.Diagnostics; using MS.Internal.PresentationCore; using System.Windows.Markup; namespace MS.Internal.TextFormatting { ////// Implements static methods for mapping CultureInfo objects. /// internal static class CultureMapper { ////// Returns a specific culture given an arbitrary CultureInfo, which may be null, the invariant /// culture, or a neutral culture. /// public static CultureInfo GetSpecificCulture(CultureInfo runCulture) { // Assume default culture unless we can do better. CultureInfo specificCulture = TypeConverterHelper.InvariantEnglishUS; if (runCulture != null) { // Assign _cachedCultureMap to a local variable for thread safety. The reference assignment // is atomic and the CachedCultureMap class is immutable. CachedCultureMap cachedCultureMap = _cachedCultureMap; if (cachedCultureMap != null && object.ReferenceEquals(cachedCultureMap.OriginalCulture, runCulture)) return cachedCultureMap.SpecificCulture; // Unfortunately we cannot use reference comparison here because, for example, new CultureInfo("") // creates an invariant culture which (being a new object) is obviously not the same instance as // CultureInfo.InvariantCulture. if (runCulture != CultureInfo.InvariantCulture) { if (!runCulture.IsNeutralCulture) { // It's already a specific culture (neither neutral nor InvariantCulture) specificCulture = runCulture; } else { // Get the culture name. Note that the string expected by CreateSpecificCulture corresponds // to the Name property, not IetfLanguageTag, so that's what we use. string cultureName = runCulture.Name; if (!string.IsNullOrEmpty(cultureName)) { try { CultureInfo culture = CultureInfo.CreateSpecificCulture(cultureName); specificCulture = SafeSecurityHelper.GetCultureInfoByIetfLanguageTag(culture.IetfLanguageTag); } catch (ArgumentException) { // This exception occurs if the culture name is invalid or has no corresponding specific // culture. we can safely ignore the exception and fall back to TypeConverterHelper.InvariantEnglishUS. specificCulture = TypeConverterHelper.InvariantEnglishUS; } } } } // Save the mapping so the next call will be fast if we're given the same runCulture. // Again, the reference assignment is atomic so this is thread safe. _cachedCultureMap = new CachedCultureMap(runCulture, specificCulture); } return specificCulture; } private class CachedCultureMap { public CachedCultureMap(CultureInfo originalCulture, CultureInfo specificCulture) { _originalCulture = originalCulture; _specificCulture = specificCulture; } ////// Original CultureInfo object from text formatting client; could be the invariant culture, /// a neutral culture, or a specific culture. /// public CultureInfo OriginalCulture { get { return _originalCulture; } } ////// CultureInfo object to use for text formatting. This is guaranteed to be a specific (i.e., /// neither neutral nor invariant) culture. It may be the same object as OriginalCulture if /// the latter is already a specific culture. /// public CultureInfo SpecificCulture { get { return _specificCulture; } } private CultureInfo _originalCulture; private CultureInfo _specificCulture; } private static CachedCultureMap _cachedCultureMap = null; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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