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Diffstat (limited to 'src/mscorlib/src/System/Globalization/GregorianCalendar.cs')
| -rw-r--r-- | src/mscorlib/src/System/Globalization/GregorianCalendar.cs | 626 |
1 files changed, 626 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/Globalization/GregorianCalendar.cs b/src/mscorlib/src/System/Globalization/GregorianCalendar.cs new file mode 100644 index 0000000000..3543d644f9 --- /dev/null +++ b/src/mscorlib/src/System/Globalization/GregorianCalendar.cs @@ -0,0 +1,626 @@ +// Copyright (c) Microsoft. All rights reserved. +// Licensed under the MIT license. See LICENSE file in the project root for full license information. + +namespace System.Globalization { + // + // N.B.: + // A lot of this code is directly from DateTime.cs. If you update that class, + // update this one as well. + // However, we still need these duplicated code because we will add era support + // in this class. + // + // + + using System.Threading; + using System; + using System.Globalization; + using System.Runtime.Serialization; + using System.Diagnostics.Contracts; + + // This calendar recognizes two era values: + // 0 CurrentEra (AD) + // 1 BeforeCurrentEra (BC) + +[System.Runtime.InteropServices.ComVisible(true)] + [Serializable] + public class GregorianCalendar : Calendar + { + /* + A.D. = anno Domini + */ + + public const int ADEra = 1; + + + internal const int DatePartYear = 0; + internal const int DatePartDayOfYear = 1; + internal const int DatePartMonth = 2; + internal const int DatePartDay = 3; + + // + // This is the max Gregorian year can be represented by DateTime class. The limitation + // is derived from DateTime class. + // + internal const int MaxYear = 9999; + + internal GregorianCalendarTypes m_type; + + internal static readonly int[] DaysToMonth365 = + { + 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 + }; + + internal static readonly int[] DaysToMonth366 = + { + 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 + }; + + private static volatile Calendar s_defaultInstance; + + +#region Serialization + [OnDeserialized] + private void OnDeserialized(StreamingContext ctx) + { + if (m_type < GregorianCalendarTypes.Localized || + m_type > GregorianCalendarTypes.TransliteratedFrench) + { + throw new SerializationException( + String.Format( + CultureInfo.CurrentCulture, + Environment.GetResourceString( + "Serialization_MemberOutOfRange"), + "type", + "GregorianCalendar")); + } + } +#endregion Serialization + + [System.Runtime.InteropServices.ComVisible(false)] + public override DateTime MinSupportedDateTime + { + get + { + return (DateTime.MinValue); + } + } + + [System.Runtime.InteropServices.ComVisible(false)] + public override DateTime MaxSupportedDateTime + { + get + { + return (DateTime.MaxValue); + } + } + + // Return the type of the Gregorian calendar. + // + + [System.Runtime.InteropServices.ComVisible(false)] + public override CalendarAlgorithmType AlgorithmType + { + get + { + return CalendarAlgorithmType.SolarCalendar; + } + } + + /*=================================GetDefaultInstance========================== + **Action: Internal method to provide a default intance of GregorianCalendar. Used by NLS+ implementation + ** and other calendars. + **Returns: + **Arguments: + **Exceptions: + ============================================================================*/ + + internal static Calendar GetDefaultInstance() { + if (s_defaultInstance == null) { + s_defaultInstance = new GregorianCalendar(); + } + return (s_defaultInstance); + } + + // Construct an instance of gregorian calendar. + + public GregorianCalendar() : + this(GregorianCalendarTypes.Localized) { + } + + + public GregorianCalendar(GregorianCalendarTypes type) { + if ((int)type < (int)GregorianCalendarTypes.Localized || (int)type > (int)GregorianCalendarTypes.TransliteratedFrench) { + throw new ArgumentOutOfRangeException( + "type", + Environment.GetResourceString("ArgumentOutOfRange_Range", + GregorianCalendarTypes.Localized, GregorianCalendarTypes.TransliteratedFrench)); + } + Contract.EndContractBlock(); + this.m_type = type; + } + + public virtual GregorianCalendarTypes CalendarType { + get { + return (m_type); + } + + set { + VerifyWritable(); + + switch (value) { + case GregorianCalendarTypes.Localized: + case GregorianCalendarTypes.USEnglish: + case GregorianCalendarTypes.MiddleEastFrench: + case GregorianCalendarTypes.Arabic: + case GregorianCalendarTypes.TransliteratedEnglish: + case GregorianCalendarTypes.TransliteratedFrench: + m_type = value; + break; + + default: + throw new ArgumentOutOfRangeException("m_type", Environment.GetResourceString("ArgumentOutOfRange_Enum")); + } + } + } + + internal override int ID { + get { + // By returning different ID for different variations of GregorianCalendar, + // we can support the Transliterated Gregorian calendar. + // DateTimeFormatInfo will use this ID to get formatting information about + // the calendar. + return ((int)m_type); + } + } + + + // Returns a given date part of this DateTime. This method is used + // to compute the year, day-of-year, month, or day part. + internal virtual int GetDatePart(long ticks, int part) + { + // n = number of days since 1/1/0001 + int n = (int)(ticks / TicksPerDay); + // y400 = number of whole 400-year periods since 1/1/0001 + int y400 = n / DaysPer400Years; + // n = day number within 400-year period + n -= y400 * DaysPer400Years; + // y100 = number of whole 100-year periods within 400-year period + int y100 = n / DaysPer100Years; + // Last 100-year period has an extra day, so decrement result if 4 + if (y100 == 4) y100 = 3; + // n = day number within 100-year period + n -= y100 * DaysPer100Years; + // y4 = number of whole 4-year periods within 100-year period + int y4 = n / DaysPer4Years; + // n = day number within 4-year period + n -= y4 * DaysPer4Years; + // y1 = number of whole years within 4-year period + int y1 = n / DaysPerYear; + // Last year has an extra day, so decrement result if 4 + if (y1 == 4) y1 = 3; + // If year was requested, compute and return it + if (part == DatePartYear) + { + return (y400 * 400 + y100 * 100 + y4 * 4 + y1 + 1); + } + // n = day number within year + n -= y1 * DaysPerYear; + // If day-of-year was requested, return it + if (part == DatePartDayOfYear) + { + return (n + 1); + } + // Leap year calculation looks different from IsLeapYear since y1, y4, + // and y100 are relative to year 1, not year 0 + bool leapYear = (y1 == 3 && (y4 != 24 || y100 == 3)); + int[] days = leapYear? DaysToMonth366: DaysToMonth365; + // All months have less than 32 days, so n >> 5 is a good conservative + // estimate for the month + int m = n >> 5 + 1; + // m = 1-based month number + while (n >= days[m]) m++; + // If month was requested, return it + if (part == DatePartMonth) return (m); + // Return 1-based day-of-month + return (n - days[m - 1] + 1); + } + + /*=================================GetAbsoluteDate========================== + **Action: Gets the absolute date for the given Gregorian date. The absolute date means + ** the number of days from January 1st, 1 A.D. + **Returns: the absolute date + **Arguments: + ** year the Gregorian year + ** month the Gregorian month + ** day the day + **Exceptions: + ** ArgumentOutOfRangException if year, month, day value is valid. + **Note: + ** This is an internal method used by DateToTicks() and the calculations of Hijri and Hebrew calendars. + ** Number of Days in Prior Years (both common and leap years) + + ** Number of Days in Prior Months of Current Year + + ** Number of Days in Current Month + ** + ============================================================================*/ + + internal static long GetAbsoluteDate(int year, int month, int day) { + if (year >= 1 && year <= MaxYear && month >= 1 && month <= 12) + { + int[] days = ((year % 4 == 0 && (year % 100 != 0 || year % 400 == 0))) ? DaysToMonth366: DaysToMonth365; + if (day >= 1 && (day <= days[month] - days[month - 1])) { + int y = year - 1; + int absoluteDate = y * 365 + y / 4 - y / 100 + y / 400 + days[month - 1] + day - 1; + return (absoluteDate); + } + } + throw new ArgumentOutOfRangeException(null, Environment.GetResourceString("ArgumentOutOfRange_BadYearMonthDay")); + } + + // Returns the tick count corresponding to the given year, month, and day. + // Will check the if the parameters are valid. + internal virtual long DateToTicks(int year, int month, int day) { + return (GetAbsoluteDate(year, month, day)* TicksPerDay); + } + + // Returns the DateTime resulting from adding the given number of + // months to the specified DateTime. The result is computed by incrementing + // (or decrementing) the year and month parts of the specified DateTime by + // value months, and, if required, adjusting the day part of the + // resulting date downwards to the last day of the resulting month in the + // resulting year. The time-of-day part of the result is the same as the + // time-of-day part of the specified DateTime. + // + // In more precise terms, considering the specified DateTime to be of the + // form y / m / d + t, where y is the + // year, m is the month, d is the day, and t is the + // time-of-day, the result is y1 / m1 / d1 + t, + // where y1 and m1 are computed by adding value months + // to y and m, and d1 is the largest value less than + // or equal to d that denotes a valid day in month m1 of year + // y1. + // + + public override DateTime AddMonths(DateTime time, int months) + { + if (months < -120000 || months > 120000) { + throw new ArgumentOutOfRangeException( + "months", + String.Format( + CultureInfo.CurrentCulture, + Environment.GetResourceString("ArgumentOutOfRange_Range"), + -120000, + 120000)); + } + Contract.EndContractBlock(); + int y = GetDatePart(time.Ticks, DatePartYear); + int m = GetDatePart(time.Ticks, DatePartMonth); + int d = GetDatePart(time.Ticks, DatePartDay); + int i = m - 1 + months; + if (i >= 0) + { + m = i % 12 + 1; + y = y + i / 12; + } + else + { + m = 12 + (i + 1) % 12; + y = y + (i - 11) / 12; + } + int[] daysArray = (y % 4 == 0 && (y % 100 != 0 || y % 400 == 0)) ? DaysToMonth366: DaysToMonth365; + int days = (daysArray[m] - daysArray[m - 1]); + + if (d > days) + { + d = days; + } + long ticks = DateToTicks(y, m, d) + time.Ticks % TicksPerDay; + Calendar.CheckAddResult(ticks, MinSupportedDateTime, MaxSupportedDateTime); + + return (new DateTime(ticks)); + } + + + // Returns the DateTime resulting from adding the given number of + // years to the specified DateTime. The result is computed by incrementing + // (or decrementing) the year part of the specified DateTime by value + // years. If the month and day of the specified DateTime is 2/29, and if the + // resulting year is not a leap year, the month and day of the resulting + // DateTime becomes 2/28. Otherwise, the month, day, and time-of-day + // parts of the result are the same as those of the specified DateTime. + // + + public override DateTime AddYears(DateTime time, int years) + { + return (AddMonths(time, years * 12)); + } + + // Returns the day-of-month part of the specified DateTime. The returned + // value is an integer between 1 and 31. + // + + public override int GetDayOfMonth(DateTime time) + { + return (GetDatePart(time.Ticks, DatePartDay)); + } + + // Returns the day-of-week part of the specified DateTime. The returned value + // is an integer between 0 and 6, where 0 indicates Sunday, 1 indicates + // Monday, 2 indicates Tuesday, 3 indicates Wednesday, 4 indicates + // Thursday, 5 indicates Friday, and 6 indicates Saturday. + // + + public override DayOfWeek GetDayOfWeek(DateTime time) + { + return ((DayOfWeek)((int)(time.Ticks / TicksPerDay + 1) % 7)); + } + + // Returns the day-of-year part of the specified DateTime. The returned value + // is an integer between 1 and 366. + // + + public override int GetDayOfYear(DateTime time) + { + return (GetDatePart(time.Ticks, DatePartDayOfYear)); + } + + // Returns the number of days in the month given by the year and + // month arguments. + // + + public override int GetDaysInMonth(int year, int month, int era) { + if (era == CurrentEra || era == ADEra) { + if (year < 1 || year > MaxYear) { + throw new ArgumentOutOfRangeException("year", Environment.GetResourceString("ArgumentOutOfRange_Range", + 1, MaxYear)); + } + if (month < 1 || month > 12) { + throw new ArgumentOutOfRangeException("month", Environment.GetResourceString("ArgumentOutOfRange_Month")); + } + int[] days = ((year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)) ? DaysToMonth366: DaysToMonth365); + return (days[month] - days[month - 1]); + } + throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue")); + } + + // Returns the number of days in the year given by the year argument for the current era. + // + + public override int GetDaysInYear(int year, int era) + { + if (era == CurrentEra || era == ADEra) { + if (year >= 1 && year <= MaxYear) { + return ((year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)) ? 366:365); + } + throw new ArgumentOutOfRangeException( + "year", + String.Format( + CultureInfo.CurrentCulture, + Environment.GetResourceString("ArgumentOutOfRange_Range"), + 1, + MaxYear)); + } + throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue")); + } + + // Returns the era for the specified DateTime value. + + public override int GetEra(DateTime time) + { + return (ADEra); + } + + + public override int[] Eras { + get { + return (new int[] {ADEra} ); + } + } + + + // Returns the month part of the specified DateTime. The returned value is an + // integer between 1 and 12. + // + + public override int GetMonth(DateTime time) + { + return (GetDatePart(time.Ticks, DatePartMonth)); + } + + // Returns the number of months in the specified year and era. + + public override int GetMonthsInYear(int year, int era) + { + if (era == CurrentEra || era == ADEra) { + if (year >= 1 && year <= MaxYear) + { + return (12); + } + throw new ArgumentOutOfRangeException( + "year", + String.Format( + CultureInfo.CurrentCulture, + Environment.GetResourceString("ArgumentOutOfRange_Range"), + 1, + MaxYear)); + } + throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue")); + } + + // Returns the year part of the specified DateTime. The returned value is an + // integer between 1 and 9999. + // + + public override int GetYear(DateTime time) + { + return (GetDatePart(time.Ticks, DatePartYear)); + } + + // Checks whether a given day in the specified era is a leap day. This method returns true if + // the date is a leap day, or false if not. + // + + public override bool IsLeapDay(int year, int month, int day, int era) + { + if (month < 1 || month > 12) { + throw new ArgumentOutOfRangeException("month", Environment.GetResourceString("ArgumentOutOfRange_Range", + 1, 12)); + } + Contract.EndContractBlock(); + + if (era != CurrentEra && era != ADEra) + { + throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue")); + } + if (year < 1 || year > MaxYear) { + throw new ArgumentOutOfRangeException( + "year", + Environment.GetResourceString("ArgumentOutOfRange_Range", 1, MaxYear)); + } + + if (day < 1 || day > GetDaysInMonth(year, month)) { + throw new ArgumentOutOfRangeException("day", Environment.GetResourceString("ArgumentOutOfRange_Range", + 1, GetDaysInMonth(year, month))); + } + if (!IsLeapYear(year)) { + return (false); + } + if (month == 2 && day == 29) { + return (true); + } + return (false); + } + + // 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) + { + if (era != CurrentEra && era != ADEra) + { + throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue")); + } + if (year < 1 || year > MaxYear) { + throw new ArgumentOutOfRangeException( + "year", + String.Format( + CultureInfo.CurrentCulture, + Environment.GetResourceString("ArgumentOutOfRange_Range"), 1, MaxYear)); + } + Contract.EndContractBlock(); + return (0); + } + + // Checks whether a given month in the specified era is a leap month. This method returns true if + // month is a leap month, or false if not. + // + + public override bool IsLeapMonth(int year, int month, int era) + { + if (era != CurrentEra && era != ADEra) { + throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue")); + } + + if (year < 1 || year > MaxYear) { + throw new ArgumentOutOfRangeException( + "year", + String.Format( + CultureInfo.CurrentCulture, + Environment.GetResourceString("ArgumentOutOfRange_Range"), 1, MaxYear)); + } + + if (month < 1 || month > 12) { + throw new ArgumentOutOfRangeException("month", Environment.GetResourceString("ArgumentOutOfRange_Range", + 1, 12)); + } + Contract.EndContractBlock(); + return (false); + + } + + // Checks whether a given year in the specified era is a leap year. This method returns true if + // year is a leap year, or false if not. + // + + public override bool IsLeapYear(int year, int era) { + if (era == CurrentEra || era == ADEra) { + if (year >= 1 && year <= MaxYear) { + return (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)); + } + + throw new ArgumentOutOfRangeException( + "year", + String.Format( + CultureInfo.CurrentCulture, + Environment.GetResourceString("ArgumentOutOfRange_Range"), 1, MaxYear)); + } + throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue")); + } + + // Returns the date and time converted to a DateTime value. Throws an exception if the n-tuple is invalid. + // + + public override DateTime ToDateTime(int year, int month, int day, int hour, int minute, int second, int millisecond, int era) + { + if (era == CurrentEra || era == ADEra) { + return new DateTime(year, month, day, hour, minute, second, millisecond); + } + throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue")); + } + + internal override Boolean TryToDateTime(int year, int month, int day, int hour, int minute, int second, int millisecond, int era, out DateTime result) { + if (era == CurrentEra || era == ADEra) { + return DateTime.TryCreate(year, month, day, hour, minute, second, millisecond, out result); + } + result = DateTime.MinValue; + return false; + } + + private const int DEFAULT_TWO_DIGIT_YEAR_MAX = 2029; + + + public override int TwoDigitYearMax + { + get { + if (twoDigitYearMax == -1) { + twoDigitYearMax = GetSystemTwoDigitYearSetting(ID, DEFAULT_TWO_DIGIT_YEAR_MAX); + } + return (twoDigitYearMax); + } + + set { + VerifyWritable(); + if (value < 99 || value > MaxYear) { + throw new ArgumentOutOfRangeException( + "year", + String.Format( + CultureInfo.CurrentCulture, + Environment.GetResourceString("ArgumentOutOfRange_Range"), + 99, + MaxYear)); + + } + twoDigitYearMax = value; + } + } + + + public override int ToFourDigitYear(int year) { + if (year < 0) { + throw new ArgumentOutOfRangeException("year", + Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); + } + Contract.EndContractBlock(); + + if (year > MaxYear) { + throw new ArgumentOutOfRangeException( + "year", + String.Format( + CultureInfo.CurrentCulture, + Environment.GetResourceString("ArgumentOutOfRange_Range"), 1, MaxYear)); + } + return (base.ToFourDigitYear(year)); + } + } +} |