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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/*============================================================
**
**
**
** Purpose:
** This class represents the current system timezone. It is
** the only meaningful implementation of the TimeZone class
** available in this version.
**
** The only TimeZone that we support in version 1 is the
** CurrentTimeZone as determined by the system timezone.
**
**
============================================================*/
using System.Collections;
using System.Globalization;
using System.Runtime.Serialization;
namespace System
{
partial class CurrentSystemTimeZone
{
// copied from CoreRT
private DaylightTime GetCachedDaylightChanges(int year)
{
object objYear = (object)year;
if (!m_CachedDaylightChanges.Contains(objYear))
{
DaylightTime currentDaylightChanges = CreateDaylightChanges(year);
lock (m_CachedDaylightChanges)
{
if (!m_CachedDaylightChanges.Contains(objYear))
{
m_CachedDaylightChanges.Add(objYear, currentDaylightChanges);
}
}
}
return (DaylightTime)m_CachedDaylightChanges[objYear];
}
// The per-year information is cached in in this instance value. As a result it can
// be cleaned up by CultureInfo.ClearCachedData, which will clear the instance of this object
private readonly Hashtable m_CachedDaylightChanges = new Hashtable();
} // class CurrentSystemTimeZone
}
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