Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Globalization / EastAsianLunisolarCalendar.cs / 1 / EastAsianLunisolarCalendar.cs
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
namespace System.Globalization {
using System;
////////////////////////////////////////////////////////////////////////////
//
// Notes about EastAsianLunisolarCalendar
//
////////////////////////////////////////////////////////////////////////////
[Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public abstract class EastAsianLunisolarCalendar : Calendar {
internal const int LeapMonth = 0;
internal const int Jan1Month = 1;
internal const int Jan1Date = 2;
internal const int nDaysPerMonth = 3;
// # of days so far in the solar year
internal static readonly int[] DaysToMonth365 =
{
0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
};
internal static readonly int[] DaysToMonth366 =
{
0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335
};
internal const int DatePartYear = 0;
internal const int DatePartDayOfYear = 1;
internal const int DatePartMonth = 2;
internal const int DatePartDay = 3;
// Return the type of the East Asian Lunisolar calendars.
//
public override CalendarAlgorithmType AlgorithmType {
get {
return CalendarAlgorithmType.LunisolarCalendar;
}
}
// Return the year number in the 60-year cycle.
//
public virtual int GetSexagenaryYear (DateTime time) {
CheckTicksRange(time.Ticks);
int year = 0, month = 0, day = 0;
TimeToLunar(time, ref year, ref month, ref day);
return ((year - 4) % 60) + 1;
}
// Return the celestial year from the 60-year cycle.
// The returned value is from 1 ~ 10.
//
public int GetCelestialStem(int sexagenaryYear) {
if ((sexagenaryYear < 1) || (sexagenaryYear > 60)) {
throw new ArgumentOutOfRangeException(
"sexagenaryYear",
String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("ArgumentOutOfRange_Range"), 1, 60));
}
return ((sexagenaryYear - 1) % 10) + 1;
}
// Return the Terrestial Branch from the the 60-year cycle.
// The returned value is from 1 ~ 12.
//
public int GetTerrestrialBranch(int sexagenaryYear) {
if ((sexagenaryYear < 1) || (sexagenaryYear > 60)) {
throw new ArgumentOutOfRangeException(
"sexagenaryYear",
String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("ArgumentOutOfRange_Range"), 1, 60));
}
return ((sexagenaryYear - 1) % 12) + 1;
}
internal abstract int GetYearInfo(int LunarYear, int Index);
internal abstract int GetYear(int year, DateTime time);
internal abstract int GetGregorianYear(int year, int era);
internal abstract int MinCalendarYear {get;}
internal abstract int MaxCalendarYear {get;}
internal abstract EraInfo[] CalEraInfo{get;}
internal abstract DateTime MinDate {get;}
internal abstract DateTime MaxDate {get;}
internal const int MaxCalendarMonth = 13;
internal const int MaxCalendarDay = 30;
internal int MinEraCalendarYear (int era) {
EraInfo[] mEraInfo = CalEraInfo;
//ChineseLunisolarCalendar does not has m_EraInfo it is going to retuen null
if (mEraInfo == null) {
return MinCalendarYear;
}
if (era == Calendar.CurrentEra) {
era = CurrentEraValue;
}
//era has to be in the supported range otherwise we will throw exception in CheckEraRange()
if (era == GetEra(MinDate)) {
return (GetYear(MinCalendarYear, MinDate));
}
for (int i = 0; i < mEraInfo.Length; i++) {
if (era == mEraInfo[i].era) {
return (mEraInfo[i].minEraYear);
}
}
throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue"));
}
internal int MaxEraCalendarYear (int era) {
EraInfo[] mEraInfo = CalEraInfo;
//ChineseLunisolarCalendar does not has m_EraInfo it is going to retuen null
if (mEraInfo == null) {
return MaxCalendarYear;
}
if (era == Calendar.CurrentEra) {
era = CurrentEraValue;
}
//era has to be in the supported range otherwise we will throw exception in CheckEraRange()
if (era == GetEra(MaxDate)) {
return (GetYear(MaxCalendarYear, MaxDate));
}
for (int i = 0; i < mEraInfo.Length; i++) {
if (era == mEraInfo[i].era) {
return (mEraInfo[i].maxEraYear);
}
}
throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue"));
}
// Construct an instance of EastAsianLunisolar calendar.
internal EastAsianLunisolarCalendar() {
}
internal void CheckTicksRange(long ticks) {
if (ticks < MinSupportedDateTime.Ticks || ticks > MaxSupportedDateTime.Ticks) {
throw new ArgumentOutOfRangeException(
"time",
String.Format(CultureInfo.InvariantCulture, Environment.GetResourceString("ArgumentOutOfRange_CalendarRange"),
MinSupportedDateTime, MaxSupportedDateTime));
}
}
internal void CheckEraRange (int era) {
if (era == Calendar.CurrentEra) {
era = CurrentEraValue;
}
if ((era GetEra(MaxDate))) {
throw new ArgumentOutOfRangeException("era", Environment.GetResourceString("ArgumentOutOfRange_InvalidEraValue"));
}
}
internal int CheckYearRange(int year, int era) {
CheckEraRange(era);
year = GetGregorianYear(year, era);
if ((year < MinCalendarYear) || (year > MaxCalendarYear)) {
throw new ArgumentOutOfRangeException(
"year",
String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("ArgumentOutOfRange_Range"), MinEraCalendarYear(era), MaxEraCalendarYear(era)));
}
return year;
}
internal int CheckYearMonthRange(int year, int month, int era) {
year = CheckYearRange(year, era);
if (month == 13)
{
//Reject if there is no leap month this year
if (GetYearInfo(year , LeapMonth) == 0)
throw new ArgumentOutOfRangeException("month", Environment.GetResourceString("ArgumentOutOfRange_Month"));
}
if (month < 1 || month > 13) {
throw new ArgumentOutOfRangeException("month", Environment.GetResourceString("ArgumentOutOfRange_Month"));
}
return year;
}
internal int InternalGetDaysInMonth(int year, int month) {
int nDays;
int mask; // mask for extracting bits
mask = 0x8000;
// convert the lunar day into a lunar month/date
mask >>= (month-1);
if ((GetYearInfo(year, nDaysPerMonth) & mask)== 0)
nDays = 29;
else
nDays = 30;
return nDays;
}
// 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) {
year = CheckYearMonthRange(year, month, era);
return InternalGetDaysInMonth(year, month);
}
internal int GergIsleap(int y) {
return ((((y)%4)!=0)?0:((((y)%100)!=0)?1:((((y)%400)!=0)?0:1)));
}
// 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) {
year = CheckYearMonthRange(year, month, era);
int daysInMonth = InternalGetDaysInMonth(year, month);
if (day < 1 || day > daysInMonth) {
BCLDebug.Log("year = " + year + ", month = " + month + ", day = " + day);
throw new ArgumentOutOfRangeException(
"day",
String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("ArgumentOutOfRange_Day"), daysInMonth, month));
}
int gy=0; int gm=0; int gd=0;
if (LunarToGregorian(year, month, day, ref gy, ref gm, ref gd)) {
return new DateTime(gy, gm, gd, hour, minute, second, millisecond);
} else {
throw new ArgumentOutOfRangeException(null, Environment.GetResourceString("ArgumentOutOfRange_BadYearMonthDay"));
}
}
//
// GregorianToLunar calculates lunar calendar info for the given gregorian year, month, date.
// The input date should be validated before calling this method.
//
internal void GregorianToLunar(int nSYear, int nSMonth, int nSDate, ref int nLYear, ref int nLMonth, ref int nLDate) {
// unsigned int nLYear, nLMonth, nLDate; // lunar ymd
int nSolarDay; // day # in solar year
int nLunarDay; // day # in lunar year
int fLeap; // is it a solar leap year?
int LDpM; // lunar days/month bitfield
int mask; // mask for extracting bits
int nDays; // # days this lunar month
int nJan1Month, nJan1Date;
// calc the solar day of year
fLeap = GergIsleap(nSYear);
nSolarDay = (fLeap==1) ? DaysToMonth366[nSMonth-1]: DaysToMonth365[nSMonth-1] ;
nSolarDay += nSDate;
// init lunar year info
nLunarDay = nSolarDay;
nLYear = nSYear;
if (nLYear == (MaxCalendarYear + 1)) {
nLYear--;
nLunarDay += ((GergIsleap(nLYear)==1) ? 366 : 365);
nJan1Month = GetYearInfo(nLYear, Jan1Month);
nJan1Date = GetYearInfo(nLYear,Jan1Date);
} else {
nJan1Month = GetYearInfo(nLYear, Jan1Month);
nJan1Date = GetYearInfo(nLYear,Jan1Date);
// check if this solar date is actually part of the previous
// lunar year
if ((nSMonth < nJan1Month) ||
(nSMonth == nJan1Month && nSDate < nJan1Date)) {
// the corresponding lunar day is actually part of the previous
// lunar year
nLYear--;
// add a solar year to the lunar day #
nLunarDay += ((GergIsleap(nLYear)==1) ? 366 : 365);
// update the new start of year
nJan1Month = GetYearInfo(nLYear, Jan1Month);
nJan1Date = GetYearInfo(nLYear, Jan1Date);
}
}
// convert solar day into lunar day.
// subtract off the beginning part of the solar year which is not
// part of the lunar year. since this part is always in Jan or Feb,
// we don't need to handle Leap Year (LY only affects March
// and later).
nLunarDay -= DaysToMonth365[nJan1Month-1];
nLunarDay -= (nJan1Date - 1);
// convert the lunar day into a lunar month/date
mask = 0x8000;
LDpM = GetYearInfo(nLYear, nDaysPerMonth);
nDays = ((LDpM & mask) != 0) ? 30 : 29;
nLMonth = 1;
while (nLunarDay > nDays) {
nLunarDay -= nDays;
nLMonth++;
mask >>= 1;
nDays = ((LDpM & mask) != 0) ? 30 : 29;
}
nLDate = nLunarDay;
}
/*
//Convert from Lunar to Gregorian
//Highly inefficient, but it works based on the forward conversion
*/
internal bool LunarToGregorian(int nLYear, int nLMonth, int nLDate, ref int nSolarYear, ref int nSolarMonth, ref int nSolarDay) {
int numLunarDays;
if (nLDate < 1 || nLDate > 30)
return false;
numLunarDays = nLDate-1;
//Add previous months days to form the total num of days from the first of the month.
for (int i = 1; i < nLMonth; i++) {
numLunarDays += InternalGetDaysInMonth(nLYear, i);
}
//Get Gregorian First of year
int nJan1Month = GetYearInfo(nLYear, Jan1Month);
int nJan1Date = GetYearInfo(nLYear, Jan1Date);
// calc the solar day of year of 1 Lunar day
int fLeap = GergIsleap(nLYear);
int[] days = (fLeap==1)? DaysToMonth366: DaysToMonth365;
nSolarDay = nJan1Date;
if (nJan1Month > 1)
nSolarDay += days [nJan1Month-1];
// Add the actual lunar day to get the solar day we want
nSolarDay = nSolarDay + numLunarDays;// - 1;
if ( nSolarDay > (fLeap + 365)) {
nSolarYear = nLYear + 1;
nSolarDay -= (fLeap + 365);
} else {
nSolarYear = nLYear;
}
for (nSolarMonth = 1; nSolarMonth < 12; nSolarMonth++) {
if (days[nSolarMonth] >= nSolarDay)
break;
}
nSolarDay -= days[nSolarMonth-1];
return true;
}
internal DateTime LunarToTime(DateTime time, int year, int month, int day) {
int gy=0; int gm=0; int gd=0;
LunarToGregorian(year, month, day, ref gy, ref gm, ref gd);
return (GregorianCalendar.GetDefaultInstance().ToDateTime(gy,gm,gd,time.Hour,time.Minute,time.Second,time.Millisecond));
}
internal void TimeToLunar(DateTime time, ref int year, ref int month, ref int day) {
int gy=0; int gm=0; int gd=0;
Calendar Greg = GregorianCalendar.GetDefaultInstance();
gy = Greg.GetYear(time);
gm = Greg.GetMonth(time);
gd = Greg.GetDayOfMonth(time);
GregorianToLunar(gy, gm, gd, ref year, ref month, ref day);
}
// 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.
//
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));
}
CheckTicksRange(time.Ticks);
int y=0; int m=0; int d=0;
TimeToLunar(time, ref y, ref m, ref d);
int i = m + months;
if (i > 0) {
int monthsInYear = InternalIsLeapYear(y)?13:12;
while (i-monthsInYear > 0) {
i -= monthsInYear;
y++;
monthsInYear = InternalIsLeapYear(y)?13:12;
}
m = i;
} else {
int monthsInYear;
while (i <= 0) {
monthsInYear = InternalIsLeapYear(y-1)?13:12;
i += monthsInYear;
y--;
}
m = i;
}
int days = InternalGetDaysInMonth(y, m);
if (d > days) {
d = days;
}
DateTime dt = LunarToTime(time, y, m, d);
CheckAddResult(dt.Ticks, MinSupportedDateTime, MaxSupportedDateTime);
return (dt);
}
public override DateTime AddYears(DateTime time, int years) {
CheckTicksRange(time.Ticks);
int y=0; int m=0; int d=0;
TimeToLunar(time, ref y, ref m, ref d);
y += years;
if (m==13 && !InternalIsLeapYear(y)) {
m = 12;
d = InternalGetDaysInMonth(y, m);
}
int DaysInMonths = InternalGetDaysInMonth(y, m);
if (d > DaysInMonths) {
d = DaysInMonths;
}
DateTime dt = LunarToTime(time, y, m, d);
CheckAddResult(dt.Ticks, MinSupportedDateTime, MaxSupportedDateTime);
return (dt);
}
// Returns the day-of-year part of the specified DateTime. The returned value
// is an integer between 1 and [354|355 |383|384].
//
public override int GetDayOfYear(DateTime time) {
CheckTicksRange(time.Ticks);
int y=0; int m=0; int d=0;
TimeToLunar(time, ref y, ref m, ref d);
for (int i=1; i daysInMonth) {
throw new ArgumentOutOfRangeException(
"day",
String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("ArgumentOutOfRange_Day"), daysInMonth, month));
}
int m = GetYearInfo(year, LeapMonth);
return ((m!=0) && (month == (m+1)));
}
// 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) {
year = CheckYearMonthRange(year, month, era);
int m = GetYearInfo(year, LeapMonth);
return ((m!=0) && (month == (m+1)));
}
// Returns the leap month in a calendar year of the specified era. This method returns 0
// if this this year is not a leap year.
//
public override int GetLeapMonth(int year, int era) {
year = CheckYearRange(year, era);
int month = GetYearInfo(year, LeapMonth);
if (month>0)
{
return (month+1);
}
return 0;
}
internal bool InternalIsLeapYear(int year) {
return (GetYearInfo(year, LeapMonth)!=0);
}
// 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) {
year = CheckYearRange(year, era);
return InternalIsLeapYear(year);
}
private const int DEFAULT_GREGORIAN_TWO_DIGIT_YEAR_MAX = 2029;
public override int TwoDigitYearMax {
get {
if (twoDigitYearMax == -1) {
twoDigitYearMax = GetSystemTwoDigitYearSetting(BaseCalendarID, GetYear(new DateTime(DEFAULT_GREGORIAN_TWO_DIGIT_YEAR_MAX, 1, 1)));
}
return (twoDigitYearMax);
}
set {
VerifyWritable();
if (value < 99 || value > MaxCalendarYear) {
throw new ArgumentOutOfRangeException(
"value",
String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("ArgumentOutOfRange_Range"), 99, MaxCalendarYear));
}
twoDigitYearMax = value;
}
}
public override int ToFourDigitYear(int year) {
year = base.ToFourDigitYear(year);
CheckYearRange(year, CurrentEra);
return (year);
}
}
}
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