Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Globalization / JapaneseCalendar.cs / 1 / JapaneseCalendar.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== namespace System.Globalization { using System; /*=================================JapaneseCalendar========================== ** ** JapaneseCalendar is based on Gregorian calendar. The month and day values are the same as ** Gregorian calendar. However, the year value is an offset to the Gregorian ** year based on the era. ** ** This system is adopted by Emperor Meiji in 1868. The year value is counted based on the reign of an emperor, ** and the era begins on the day an emperor ascends the throne and continues until his death. ** The era changes at 12:00AM. ** ** For example, the current era is Heisei. It started on 1989/1/8 A.D. Therefore, Gregorian year 1989 is also Heisei 1st. ** 1989/1/8 A.D. is also Heisei 1st 1/8. ** ** Any date in the year during which era is changed can be reckoned in either era. For example, ** 1989/1/1 can be 1/1 Heisei 1st year or 1/1 Showa 64th year. ** ** Note: ** The DateTime can be represented by the JapaneseCalendar are limited to two factors: ** 1. The min value and max value of DateTime class. ** 2. The available era information. ** ** Calendar support range: ** Calendar Minimum Maximum ** ========== ========== ========== ** Gregorian 1868/09/08 9999/12/31 ** Japanese Meiji 01/01 Heisei 8011/12/31 ============================================================================*/ [Serializable] [System.Runtime.InteropServices.ComVisible(true)] public class JapaneseCalendar : Calendar { internal static readonly DateTime calendarMinValue = new DateTime(1868, 9, 8); [System.Runtime.InteropServices.ComVisible(false)] public override DateTime MinSupportedDateTime { get { return (calendarMinValue); } } [System.Runtime.InteropServices.ComVisible(false)] public override DateTime MaxSupportedDateTime { get { return (DateTime.MaxValue); } } // Return the type of the Japanese calendar. // [System.Runtime.InteropServices.ComVisible(false)] public override CalendarAlgorithmType AlgorithmType { get { return CalendarAlgorithmType.SolarCalendar; } } // m_EraInfo must be listed in reverse chronological order. The most recent era // should be the first element. // That is, m_EraInfo[0] contains the most recent era. static internal EraInfo[] m_EraInfo = GregorianCalendarHelper.InitEraInfo(Calendar.CAL_JAPAN); // The era value of the current era. internal static Calendar m_defaultInstance; internal GregorianCalendarHelper helper; /*=================================GetDefaultInstance========================== **Action: Internal method to provide a default intance of JapaneseCalendar. Used by NLS+ implementation ** and other calendars. **Returns: **Arguments: **Exceptions: ============================================================================*/ internal static Calendar GetDefaultInstance() { if (m_defaultInstance == null) { m_defaultInstance = new JapaneseCalendar(); } return (m_defaultInstance); } public JapaneseCalendar() { helper = new GregorianCalendarHelper(this, m_EraInfo); } internal override int ID { get { return (CAL_JAPAN); } } public override DateTime AddMonths(DateTime time, int months) { return (helper.AddMonths(time, months)); } public override DateTime AddYears(DateTime time, int years) { return (helper.AddYears(time, years)); } /*=================================GetDaysInMonth========================== **Action: Returns the number of days in the month given by the year and month arguments. **Returns: The number of days in the given month. **Arguments: ** year The year in Japanese calendar. ** month The month ** era The Japanese era value. **Exceptions ** ArgumentException If month is less than 1 or greater * than 12. ============================================================================*/ public override int GetDaysInMonth(int year, int month, int era) { return (helper.GetDaysInMonth(year, month, era)); } public override int GetDaysInYear(int year, int era) { return (helper.GetDaysInYear(year, era)); } public override int GetDayOfMonth(DateTime time) { return (helper.GetDayOfMonth(time)); } public override DayOfWeek GetDayOfWeek(DateTime time) { return (helper.GetDayOfWeek(time)); } public override int GetDayOfYear(DateTime time) { return (helper.GetDayOfYear(time)); } public override int GetMonthsInYear(int year, int era) { return (helper.GetMonthsInYear(year, era)); } [System.Runtime.InteropServices.ComVisible(false)] public override int GetWeekOfYear(DateTime time, CalendarWeekRule rule, DayOfWeek firstDayOfWeek) { return (helper.GetWeekOfYear(time, rule, firstDayOfWeek)); } /*=================================GetEra========================== **Action: Get the era value of the specified time. **Returns: The era value for the specified time. **Arguments: ** time the specified date time. **Exceptions: ArgumentOutOfRangeException if time is out of the valid era ranges. ============================================================================*/ public override int GetEra(DateTime time) { return (helper.GetEra(time)); } public override int GetMonth(DateTime time) { return (helper.GetMonth(time)); } public override int GetYear(DateTime time) { return (helper.GetYear(time)); } public override bool IsLeapDay(int year, int month, int day, int era) { return (helper.IsLeapDay(year, month, day, era)); } public override bool IsLeapYear(int year, int era) { return (helper.IsLeapYear(year, era)); } // Returns the leap month in a calendar year of the specified era. This method returns 0 // if this calendar does not have leap month, or this year is not a leap year. // [System.Runtime.InteropServices.ComVisible(false)] public override int GetLeapMonth(int year, int era) { return (helper.GetLeapMonth(year, era)); } public override bool IsLeapMonth(int year, int month, int era) { return (helper.IsLeapMonth(year, month, era)); } public override DateTime ToDateTime(int year, int month, int day, int hour, int minute, int second, int millisecond, int era) { return (helper.ToDateTime(year, month, day, hour, minute, second, millisecond, era)); } // For Japanese calendar, four digit year is not used. Few emperors will live for more than one hundred years. // Therefore, for any two digit number, we just return the original number. public override int ToFourDigitYear(int year) { if (year <= 0) { throw new ArgumentOutOfRangeException("year", Environment.GetResourceString("ArgumentOutOfRange_NeedPosNum")); } if (year > helper.MaxYear) { throw new ArgumentOutOfRangeException( "year", String.Format( CultureInfo.CurrentCulture, Environment.GetResourceString("ArgumentOutOfRange_Range"), 1, helper.MaxYear)); } return (year); } public override int[] Eras { get { return (helper.Eras); } } private const int DEFAULT_TWO_DIGIT_YEAR_MAX = 99; internal override bool IsValidYear(int year, int era) { return helper.IsValidYear(year, era); } public override int TwoDigitYearMax { get { if (twoDigitYearMax == -1) { twoDigitYearMax = GetSystemTwoDigitYearSetting(ID, DEFAULT_TWO_DIGIT_YEAR_MAX); } return (twoDigitYearMax); } set { VerifyWritable(); if (value < 99|| value > helper.MaxYear) { throw new ArgumentOutOfRangeException( "year", String.Format( CultureInfo.CurrentCulture, Environment.GetResourceString("ArgumentOutOfRange_Range"), 99, helper.MaxYear)); } twoDigitYearMax = value; } } } }
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