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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.
using Microsoft.Win32;
namespace System.Globalization
{
public partial class HijriCalendar : Calendar
{
private int GetHijriDateAdjustment()
{
if (_hijriAdvance == Int32.MinValue)
{
// Never been set before. Use the system value from registry.
_hijriAdvance = GetAdvanceHijriDate();
}
return (_hijriAdvance);
}
private const String InternationalRegKey = "Control Panel\\International";
private const String HijriAdvanceRegKeyEntry = "AddHijriDate";
/*=================================GetAdvanceHijriDate==========================
**Action: Gets the AddHijriDate value from the registry.
**Returns:
**Arguments: None.
**Exceptions:
**Note:
** The HijriCalendar has a user-overidable calculation. That is, use can set a value from the control
** panel, so that the calculation of the Hijri Calendar can move ahead or backwards from -2 to +2 days.
**
** The valid string values in the registry are:
** "AddHijriDate-2" => Add -2 days to the current calculated Hijri date.
** "AddHijriDate" => Add -1 day to the current calculated Hijri date.
** "" => Add 0 day to the current calculated Hijri date.
** "AddHijriDate+1" => Add +1 days to the current calculated Hijri date.
** "AddHijriDate+2" => Add +2 days to the current calculated Hijri date.
============================================================================*/
private static int GetAdvanceHijriDate()
{
int hijriAdvance = 0;
Microsoft.Win32.RegistryKey key = null;
using (key = Registry.CurrentUser.OpenSubKey(InternationalRegKey, writable: false))
{
if (key == null)
return 0;
Object value = key.GetValue(HijriAdvanceRegKeyEntry);
if (value == null)
{
return (0);
}
String str = value.ToString();
if (String.Compare(str, 0, HijriAdvanceRegKeyEntry, 0, HijriAdvanceRegKeyEntry.Length, StringComparison.OrdinalIgnoreCase) == 0)
{
if (str.Length == HijriAdvanceRegKeyEntry.Length)
hijriAdvance = -1;
else
{
str = str.Substring(HijriAdvanceRegKeyEntry.Length);
try
{
int advance = Int32.Parse(str.ToString(), CultureInfo.InvariantCulture);
if ((advance >= MinAdvancedHijri) && (advance <= MaxAdvancedHijri))
{
hijriAdvance = advance;
}
}
// If we got garbage from registry just ignore it.
// hijriAdvance = 0 because of declaraction assignment up above.
catch (ArgumentException) { }
catch (FormatException) { }
catch (OverflowException) { }
}
}
}
return (hijriAdvance);
}
}
}
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