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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 System.Collections.Generic;
namespace System.Globalization
{
public partial class JapaneseCalendar : Calendar
{
private static EraInfo[] GetJapaneseEras()
{
string[] eraNames;
if (!CalendarData.EnumCalendarInfo("ja-JP", CalendarId.JAPAN, CalendarDataType.EraNames, out eraNames))
{
return null;
}
string[] abbrevEnglishEraNames;
if (!CalendarData.EnumCalendarInfo("en", CalendarId.JAPAN, CalendarDataType.AbbrevEraNames, out abbrevEnglishEraNames))
{
return null;
}
List<EraInfo> eras = new List<EraInfo>();
int lastMaxYear = GregorianCalendar.MaxYear;
int latestEra = Interop.GlobalizationInterop.GetLatestJapaneseEra();
for (int i = latestEra; i >= 0; i--)
{
DateTime dt;
if (!GetJapaneseEraStartDate(i, out dt))
{
return null;
}
if (dt < JapaneseCalendar.calendarMinValue)
{
// only populate the Eras that are valid JapaneseCalendar date times
break;
}
eras.Add(new EraInfo(i, dt.Year, dt.Month, dt.Day, dt.Year - 1, 1, lastMaxYear - dt.Year + 1,
eraNames[i], GetAbbreviatedEraName(eraNames, i), abbrevEnglishEraNames[i]));
lastMaxYear = dt.Year;
}
// remap the Era numbers, now that we know how many there will be
for (int i = 0; i < eras.Count; i++)
{
eras[i].era = eras.Count - i;
}
return eras.ToArray();
}
// PAL Layer ends here
private static string GetAbbreviatedEraName(string[] eraNames, int eraIndex)
{
// This matches the behavior on Win32 - only returning the first character of the era name.
// See Calendar.EraAsString(Int32) - https://msdn.microsoft.com/en-us/library/windows/apps/br206751.aspx
return eraNames[eraIndex].Substring(0, 1);
}
private static bool GetJapaneseEraStartDate(int era, out DateTime dateTime)
{
dateTime = default(DateTime);
int startYear;
int startMonth;
int startDay;
bool result = Interop.GlobalizationInterop.GetJapaneseEraStartDate(
era,
out startYear,
out startMonth,
out startDay);
if (result)
{
dateTime = new DateTime(startYear, startMonth, startDay);
}
return result;
}
}
}
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