JapaneseCalendar.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / 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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JapaneseCalendar.cs source code in C# .NET

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