diff options
Diffstat (limited to 'src/mscorlib/corefx/System/Globalization/JapaneseCalendar.Unix.cs')
-rw-r--r-- | src/mscorlib/corefx/System/Globalization/JapaneseCalendar.Unix.cs | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/src/mscorlib/corefx/System/Globalization/JapaneseCalendar.Unix.cs b/src/mscorlib/corefx/System/Globalization/JapaneseCalendar.Unix.cs new file mode 100644 index 0000000000..12f430c71c --- /dev/null +++ b/src/mscorlib/corefx/System/Globalization/JapaneseCalendar.Unix.cs @@ -0,0 +1,91 @@ +// 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; +using System.Security; + +namespace System.Globalization +{ + public partial class JapaneseCalendar : Calendar + { + [SecuritySafeCritical] + 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); + } + + [SecuritySafeCritical] + 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; + } + } +} |