Calendar is an abstract base class for converting between
* a UDate object and a set of integer fields such as
* YEAR, MONTH, DAY, HOUR,
* and so on. (A UDate object represents a specific instant in
* time with millisecond precision. See UDate
* for information about the UDate class.)
*
*
* Subclasses of Calendar interpret a UDate
* according to the rules of a specific calendar system.
* The most commonly used subclass of Calendar is
* GregorianCalendar. Other subclasses could represent
* the various types of lunar calendars in use in many parts of the world.
*
*
* NOTE: (ICU 2.6) The subclass interface should be considered unstable * - it WILL change. * *
* Like other locale-sensitive classes, Calendar provides a
* static method, createInstance, for getting a generally useful
* object of this type. Calendar's createInstance method
* returns the appropriate Calendar subclass whose
* time fields have been initialized with the current date and time:
* \htmlonly
\endhtmlonly *\endhtmlonly * ** Calendar *rightNow = Calendar::createInstance(errCode); ** \htmlonly
* A Calendar object can produce all the time field values
* needed to implement the date-time formatting for a particular language
* and calendar style (for example, Japanese-Gregorian, Japanese-Traditional).
*
*
* When computing a UDate from time fields, some special circumstances
* may arise: there may be insufficient information to compute the
* UDate (such as only year and month but no day in the month),
* there may be inconsistent information (such as "Tuesday, July 15, 1996"
* -- July 15, 1996 is actually a Monday), or the input time might be ambiguous
* because of time zone transition.
*
*
* Insufficient information. The calendar will use default * information to specify the missing fields. This may vary by calendar; for * the Gregorian calendar, the default for a field is the same as that of the * start of the epoch: i.e., YEAR = 1970, MONTH = JANUARY, DATE = 1, etc. * *
* Inconsistent information. If fields conflict, the calendar * will give preference to fields set more recently. For example, when * determining the day, the calendar will look for one of the following * combinations of fields. The most recent combination, as determined by the * most recently set single field, will be used. * * \htmlonly
\endhtmlonly *\endhtmlonly * * For the time of day: * * \htmlonly* MONTH + DAY_OF_MONTH * MONTH + WEEK_OF_MONTH + DAY_OF_WEEK * MONTH + DAY_OF_WEEK_IN_MONTH + DAY_OF_WEEK * DAY_OF_YEAR * DAY_OF_WEEK + WEEK_OF_YEAR ** \htmlonly
\endhtmlonly *\endhtmlonly * ** HOUR_OF_DAY * AM_PM + HOUR ** \htmlonly
* Ambiguous Wall Clock Time. When time offset from UTC has * changed, it produces ambiguous time slot around the transition. For example, * many US locations observe daylight saving time. On the date switching to daylight * saving time in US, wall clock time jumps from 1:00 AM (standard) to 2:00 AM * (daylight). Therefore, wall clock time from 1:00 AM to 1:59 AM do not exist on * the date. When the input wall time fall into this missing time slot, the ICU * Calendar resolves the time using the UTC offset before the transition by default. * In this example, 1:30 AM is interpreted as 1:30 AM standard time (non-exist), * so the final result will be 2:30 AM daylight time. * *
On the date switching back to standard time, wall clock time is moved back one * hour at 2:00 AM. So wall clock time from 1:00 AM to 1:59 AM occur twice. In this * case, the ICU Calendar resolves the time using the UTC offset after the transition * by default. For example, 1:30 AM on the date is resolved as 1:30 AM standard time. * *
Ambiguous wall clock time resolution behaviors can be customized by Calendar APIs * {@link #setRepeatedWallTimeOption} and {@link #setSkippedWallTimeOption}. * These methods are available in ICU 49 or later versions. * *
* Note: for some non-Gregorian calendars, different * fields may be necessary for complete disambiguation. For example, a full * specification of the historial Arabic astronomical calendar requires year, * month, day-of-month and day-of-week in some cases. * *
* Note: There are certain possible ambiguities in * interpretation of certain singular times, which are resolved in the * following ways: *
* The date or time format strings are not part of the definition of a * calendar, as those must be modifiable or overridable by the user at * runtime. Use {@link DateFormat} * to format dates. * *
* Calendar provides an API for field "rolling", where fields
* can be incremented or decremented, but wrap around. For example, rolling the
* month up in the date December 12, 1996 results in
* January 12, 1996.
*
*
* Calendar also provides a date arithmetic function for
* adding the specified (signed) amount of time to a particular time field.
* For example, subtracting 5 days from the date September 12, 1996
* results in September 7, 1996.
*
*
Supported range * *
The allowable range of Calendar has been
* narrowed. GregorianCalendar used to attempt to support
* the range of dates with millisecond values from
* Long.MIN_VALUE to Long.MAX_VALUE.
* The new Calendar protocol specifies the
* maximum range of supportable dates as those having Julian day numbers
* of -0x7F000000 to +0x7F000000. This
* corresponds to years from ~5,800,000 BCE to ~5,800,000 CE. Programmers
* should use the protected constants in Calendar to
* specify an extremely early or extremely late date.
* NOTE: Do not use this method -- use roll(EDateFields, int, UErrorCode&) instead. * * @param field The time field. * @param up Indicates if the value of the specified time field is to be rolled * up or rolled down. Use true if rolling up, false otherwise. * @param status Output param set to success/failure code on exit. If any value * previously set in the time field is invalid or restricted by * leniency, this will be set to an error status. * @deprecated ICU 2.6. Use roll(UCalendarDateFields field, UBool up, UErrorCode& status) instead. */ inline void roll(EDateFields field, UBool up, UErrorCode& status); #endif /* U_HIDE_DEPRECATED_API */ /** * Time Field Rolling function. Rolls (up/down) a single unit of time on the given * time field. For example, to roll the current date up by one day, call * roll(Calendar::DATE, true). When rolling on the year or Calendar::YEAR field, it * will roll the year value in the range between getMinimum(Calendar::YEAR) and the * value returned by getMaximum(Calendar::YEAR). When rolling on the month or * Calendar::MONTH field, other fields like date might conflict and, need to be * changed. For instance, rolling the month up on the date 01/31/96 will result in * 02/29/96. Rolling up always means rolling forward in time (unless the limit of the * field is reached, in which case it may pin or wrap), so for Gregorian calendar, * starting with 100 BC and rolling the year up results in 99 BC. * When eras have a definite beginning and end (as in the Chinese calendar, or as in * most eras in the Japanese calendar) then rolling the year past either limit of the * era will cause the year to wrap around. When eras only have a limit at one end, * then attempting to roll the year past that limit will result in pinning the year * at that limit. Note that for most calendars in which era 0 years move forward in * time (such as Buddhist, Hebrew, or Islamic), it is possible for add or roll to * result in negative years for era 0 (that is the only way to represent years before * the calendar epoch). * When rolling on the hour-in-day or Calendar::HOUR_OF_DAY field, it will roll the * hour value in the range between 0 and 23, which is zero-based. *
* NOTE: Do not use this method -- use roll(UCalendarDateFields, int, UErrorCode&) instead. * * @param field The time field. * @param up Indicates if the value of the specified time field is to be rolled * up or rolled down. Use true if rolling up, false otherwise. * @param status Output param set to success/failure code on exit. If any value * previously set in the time field is invalid or restricted by * leniency, this will be set to an error status. * @stable ICU 2.6. */ inline void roll(UCalendarDateFields field, UBool up, UErrorCode& status); /** * Time Field Rolling function. Rolls by the given amount on the given * time field. For example, to roll the current date up by one day, call * roll(Calendar::DATE, +1, status). When rolling on the month or * Calendar::MONTH field, other fields like date might conflict and, need to be * changed. For instance, rolling the month up on the date 01/31/96 will result in * 02/29/96. Rolling by a positive value always means rolling forward in time (unless * the limit of the field is reached, in which case it may pin or wrap), so for * Gregorian calendar, starting with 100 BC and rolling the year by + 1 results in 99 BC. * When eras have a definite beginning and end (as in the Chinese calendar, or as in * most eras in the Japanese calendar) then rolling the year past either limit of the * era will cause the year to wrap around. When eras only have a limit at one end, * then attempting to roll the year past that limit will result in pinning the year * at that limit. Note that for most calendars in which era 0 years move forward in * time (such as Buddhist, Hebrew, or Islamic), it is possible for add or roll to * result in negative years for era 0 (that is the only way to represent years before * the calendar epoch). * When rolling on the hour-in-day or Calendar::HOUR_OF_DAY field, it will roll the * hour value in the range between 0 and 23, which is zero-based. *
* The only difference between roll() and add() is that roll() does not change * the value of more significant fields when it reaches the minimum or maximum * of its range, whereas add() does. * * @param field The time field. * @param amount Indicates amount to roll. * @param status Output param set to success/failure code on exit. If any value * previously set in the time field is invalid, this will be set to * an error status. * @deprecated ICU 2.6. Use roll(UCalendarDateFields field, int32_t amount, UErrorCode& status) instead. */ virtual void roll(EDateFields field, int32_t amount, UErrorCode& status); /** * Time Field Rolling function. Rolls by the given amount on the given * time field. For example, to roll the current date up by one day, call * roll(Calendar::DATE, +1, status). When rolling on the month or * Calendar::MONTH field, other fields like date might conflict and, need to be * changed. For instance, rolling the month up on the date 01/31/96 will result in * 02/29/96. Rolling by a positive value always means rolling forward in time (unless * the limit of the field is reached, in which case it may pin or wrap), so for * Gregorian calendar, starting with 100 BC and rolling the year by + 1 results in 99 BC. * When eras have a definite beginning and end (as in the Chinese calendar, or as in * most eras in the Japanese calendar) then rolling the year past either limit of the * era will cause the year to wrap around. When eras only have a limit at one end, * then attempting to roll the year past that limit will result in pinning the year * at that limit. Note that for most calendars in which era 0 years move forward in * time (such as Buddhist, Hebrew, or Islamic), it is possible for add or roll to * result in negative years for era 0 (that is the only way to represent years before * the calendar epoch). * When rolling on the hour-in-day or Calendar::HOUR_OF_DAY field, it will roll the * hour value in the range between 0 and 23, which is zero-based. *
* The only difference between roll() and add() is that roll() does not change
* the value of more significant fields when it reaches the minimum or maximum
* of its range, whereas add() does.
*
* @param field The time field.
* @param amount Indicates amount to roll.
* @param status Output param set to success/failure code on exit. If any value
* previously set in the time field is invalid, this will be set to
* an error status.
* @stable ICU 2.6.
*/
virtual void roll(UCalendarDateFields field, int32_t amount, UErrorCode& status);
/**
* Return the difference between the given time and the time this
* calendar object is set to. If this calendar is set
* before the given time, the returned value will be
* positive. If this calendar is set after the given
* time, the returned value will be negative. The
* field parameter specifies the units of the return
* value. For example, if fieldDifference(when,
* Calendar::MONTH) returns 3, then this calendar is set to
* 3 months before when, and possibly some addition
* time less than one month.
*
*
As a side effect of this call, this calendar is advanced
* toward when by the given amount. That is, calling
* this method has the side effect of calling add(field,
* n), where n is the return value.
*
*
Usage: To use this method, call it first with the largest * field of interest, then with progressively smaller fields. For * example: * *
* int y = cal->fieldDifference(when, Calendar::YEAR, err);
* int m = cal->fieldDifference(when, Calendar::MONTH, err);
* int d = cal->fieldDifference(when, Calendar::DATE, err);
*
* computes the difference between cal and
* when in years, months, and days.
*
* Note: fieldDifference() is
* asymmetrical. That is, in the following code:
*
*
* cal->setTime(date1, err);
* int m1 = cal->fieldDifference(date2, Calendar::MONTH, err);
* int d1 = cal->fieldDifference(date2, Calendar::DATE, err);
* cal->setTime(date2, err);
* int m2 = cal->fieldDifference(date1, Calendar::MONTH, err);
* int d2 = cal->fieldDifference(date1, Calendar::DATE, err);
*
* one might expect that m1 == -m2 && d1 == -d2.
* However, this is not generally the case, because of
* irregularities in the underlying calendar system (e.g., the
* Gregorian calendar has a varying number of days per month).
*
* @param when the date to compare this calendar's time to
* @param field the field in which to compute the result
* @param status Output param set to success/failure code on exit. If any value
* previously set in the time field is invalid, this will be set to
* an error status.
* @return the difference, either positive or negative, between
* this calendar's time and when, in terms of
* field.
* @deprecated ICU 2.6. Use fieldDifference(UDate when, UCalendarDateFields field, UErrorCode& status).
*/
virtual int32_t fieldDifference(UDate when, EDateFields field, UErrorCode& status);
/**
* Return the difference between the given time and the time this
* calendar object is set to. If this calendar is set
* before the given time, the returned value will be
* positive. If this calendar is set after the given
* time, the returned value will be negative. The
* field parameter specifies the units of the return
* value. For example, if fieldDifference(when,
* Calendar::MONTH) returns 3, then this calendar is set to
* 3 months before when, and possibly some addition
* time less than one month.
*
* As a side effect of this call, this calendar is advanced
* toward when by the given amount. That is, calling
* this method has the side effect of calling add(field,
* n), where n is the return value.
*
*
Usage: To use this method, call it first with the largest * field of interest, then with progressively smaller fields. For * example: * *
* int y = cal->fieldDifference(when, Calendar::YEAR, err);
* int m = cal->fieldDifference(when, Calendar::MONTH, err);
* int d = cal->fieldDifference(when, Calendar::DATE, err);
*
* computes the difference between cal and
* when in years, months, and days.
*
* Note: fieldDifference() is
* asymmetrical. That is, in the following code:
*
*
* cal->setTime(date1, err);
* int m1 = cal->fieldDifference(date2, Calendar::MONTH, err);
* int d1 = cal->fieldDifference(date2, Calendar::DATE, err);
* cal->setTime(date2, err);
* int m2 = cal->fieldDifference(date1, Calendar::MONTH, err);
* int d2 = cal->fieldDifference(date1, Calendar::DATE, err);
*
* one might expect that m1 == -m2 && d1 == -d2.
* However, this is not generally the case, because of
* irregularities in the underlying calendar system (e.g., the
* Gregorian calendar has a varying number of days per month).
*
* @param when the date to compare this calendar's time to
* @param field the field in which to compute the result
* @param status Output param set to success/failure code on exit. If any value
* previously set in the time field is invalid, this will be set to
* an error status.
* @return the difference, either positive or negative, between
* this calendar's time and when, in terms of
* field.
* @stable ICU 2.6.
*/
virtual int32_t fieldDifference(UDate when, UCalendarDateFields field, UErrorCode& status);
/**
* Sets the calendar's time zone to be the one passed in. The Calendar takes ownership
* of the TimeZone; the caller is no longer responsible for deleting it. If the
* given time zone is NULL, this function has no effect.
*
* @param value The given time zone.
* @stable ICU 2.0
*/
void adoptTimeZone(TimeZone* value);
/**
* Sets the calendar's time zone to be the same as the one passed in. The TimeZone
* passed in is _not_ adopted; the client is still responsible for deleting it.
*
* @param zone The given time zone.
* @stable ICU 2.0
*/
void setTimeZone(const TimeZone& zone);
/**
* Returns a reference to the time zone owned by this calendar. The returned reference
* is only valid until clients make another call to adoptTimeZone or setTimeZone,
* or this Calendar is destroyed.
*
* @return The time zone object associated with this calendar.
* @stable ICU 2.0
*/
const TimeZone& getTimeZone(void) const;
/**
* Returns the time zone owned by this calendar. The caller owns the returned object
* and must delete it when done. After this call, the new time zone associated
* with this Calendar is the default TimeZone as returned by TimeZone::createDefault().
*
* @return The time zone object which was associated with this calendar.
* @stable ICU 2.0
*/
TimeZone* orphanTimeZone(void);
/**
* Queries if the current date for this Calendar is in Daylight Savings Time.
*
* @param status Fill-in parameter which receives the status of this operation.
* @return True if the current date for this Calendar is in Daylight Savings Time,
* false, otherwise.
* @stable ICU 2.0
*/
virtual UBool inDaylightTime(UErrorCode& status) const = 0;
/**
* Specifies whether or not date/time interpretation is to be lenient. With lenient
* interpretation, a date such as "February 942, 1996" will be treated as being
* equivalent to the 941st day after February 1, 1996. With strict interpretation,
* such dates will cause an error when computing time from the time field values
* representing the dates.
*
* @param lenient True specifies date/time interpretation to be lenient.
*
* @see DateFormat#setLenient
* @stable ICU 2.0
*/
void setLenient(UBool lenient);
/**
* Tells whether date/time interpretation is to be lenient.
*
* @return True tells that date/time interpretation is to be lenient.
* @stable ICU 2.0
*/
UBool isLenient(void) const;
#ifndef U_HIDE_DRAFT_API
/**
* Sets the behavior for handling wall time repeating multiple times
* at negative time zone offset transitions. For example, 1:30 AM on
* November 6, 2011 in US Eastern time (Ameirca/New_York) occurs twice;
* 1:30 AM EDT, then 1:30 AM EST one hour later. When UCAL_WALLTIME_FIRST
* is used, the wall time 1:30AM in this example will be interpreted as 1:30 AM EDT
* (first occurrence). When UCAL_WALLTIME_LAST is used, it will be
* interpreted as 1:30 AM EST (last occurrence). The default value is
* UCAL_WALLTIME_LAST.
*
* Note:When UCAL_WALLTIME_NEXT_VALID is not a valid
* option for this. When the argument is neither UCAL_WALLTIME_FIRST
* nor UCAL_WALLTIME_LAST, this method has no effect and will keep
* the current setting.
*
* @param option the behavior for handling repeating wall time, either
* UCAL_WALLTIME_FIRST or UCAL_WALLTIME_LAST.
* @see #getRepeatedWallTimeOption
* @draft ICU 49
*/
void setRepeatedWallTimeOption(UCalendarWallTimeOption option);
/**
* Gets the behavior for handling wall time repeating multiple times
* at negative time zone offset transitions.
*
* @return the behavior for handling repeating wall time, either
* UCAL_WALLTIME_FIRST or UCAL_WALLTIME_LAST.
* @see #setRepeatedWallTimeOption
* @draft ICU 49
*/
UCalendarWallTimeOption getRepeatedWallTimeOption(void) const;
/**
* Sets the behavior for handling skipped wall time at positive time zone offset
* transitions. For example, 2:30 AM on March 13, 2011 in US Eastern time (America/New_York)
* does not exist because the wall time jump from 1:59 AM EST to 3:00 AM EDT. When
* UCAL_WALLTIME_FIRST is used, 2:30 AM is interpreted as 30 minutes before 3:00 AM
* EDT, therefore, it will be resolved as 1:30 AM EST. When UCAL_WALLTIME_LAST
* is used, 2:30 AM is interpreted as 31 minutes after 1:59 AM EST, therefore, it will be
* resolved as 3:30 AM EDT. When UCAL_WALLTIME_NEXT_VALID is used, 2:30 AM will
* be resolved as next valid wall time, that is 3:00 AM EDT. The default value is
* UCAL_WALLTIME_LAST.
*
* Note:This option is effective only when this calendar is lenient.
* When the calendar is strict, such non-existing wall time will cause an error.
*
* @param option the behavior for handling skipped wall time at positive time zone
* offset transitions, one of UCAL_WALLTIME_FIRST, UCAL_WALLTIME_LAST and
* UCAL_WALLTIME_NEXT_VALID.
* @see #getSkippedWallTimeOption
*
* @draft ICU 49
*/
void setSkippedWallTimeOption(UCalendarWallTimeOption option);
/**
* Gets the behavior for handling skipped wall time at positive time zone offset
* transitions.
*
* @return the behavior for handling skipped wall time, one of
* UCAL_WALLTIME_FIRST, UCAL_WALLTIME_LAST
* and UCAL_WALLTIME_NEXT_VALID.
* @see #setSkippedWallTimeOption
* @draft ICU 49
*/
UCalendarWallTimeOption getSkippedWallTimeOption(void) const;
#endif /* U_HIDE_DRAFT_API */
#ifndef U_HIDE_DEPRECATED_API
/**
* Sets what the first day of the week is; e.g., Sunday in US, Monday in France.
*
* @param value The given first day of the week.
* @deprecated ICU 2.6. Use setFirstDayOfWeek(UCalendarDaysOfWeek value) instead.
*/
void setFirstDayOfWeek(EDaysOfWeek value);
#endif /* U_HIDE_DEPRECATED_API */
/**
* Sets what the first day of the week is; e.g., Sunday in US, Monday in France.
*
* @param value The given first day of the week.
* @stable ICU 2.6.
*/
void setFirstDayOfWeek(UCalendarDaysOfWeek value);
#ifndef U_HIDE_DEPRECATED_API
/**
* Gets what the first day of the week is; e.g., Sunday in US, Monday in France.
*
* @return The first day of the week.
* @deprecated ICU 2.6 use the overload with error code
*/
EDaysOfWeek getFirstDayOfWeek(void) const;
#endif /* U_HIDE_DEPRECATED_API */
/**
* Gets what the first day of the week is; e.g., Sunday in US, Monday in France.
*
* @param status error code
* @return The first day of the week.
* @stable ICU 2.6
*/
UCalendarDaysOfWeek getFirstDayOfWeek(UErrorCode &status) const;
/**
* Sets what the minimal days required in the first week of the year are; For
* example, if the first week is defined as one that contains the first day of the
* first month of a year, call the method with value 1. If it must be a full week,
* use value 7.
*
* @param value The given minimal days required in the first week of the year.
* @stable ICU 2.0
*/
void setMinimalDaysInFirstWeek(uint8_t value);
/**
* Gets what the minimal days required in the first week of the year are; e.g., if
* the first week is defined as one that contains the first day of the first month
* of a year, getMinimalDaysInFirstWeek returns 1. If the minimal days required must
* be a full week, getMinimalDaysInFirstWeek returns 7.
*
* @return The minimal days required in the first week of the year.
* @stable ICU 2.0
*/
uint8_t getMinimalDaysInFirstWeek(void) const;
/**
* Gets the minimum value for the given time field. e.g., for Gregorian
* DAY_OF_MONTH, 1.
*
* @param field The given time field.
* @return The minimum value for the given time field.
* @deprecated ICU 2.6. Use getMinimum(UCalendarDateFields field) instead.
*/
virtual int32_t getMinimum(EDateFields field) const;
/**
* Gets the minimum value for the given time field. e.g., for Gregorian
* DAY_OF_MONTH, 1.
*
* @param field The given time field.
* @return The minimum value for the given time field.
* @stable ICU 2.6.
*/
virtual int32_t getMinimum(UCalendarDateFields field) const;
/**
* Gets the maximum value for the given time field. e.g. for Gregorian DAY_OF_MONTH,
* 31.
*
* @param field The given time field.
* @return The maximum value for the given time field.
* @deprecated ICU 2.6. Use getMaximum(UCalendarDateFields field) instead.
*/
virtual int32_t getMaximum(EDateFields field) const;
/**
* Gets the maximum value for the given time field. e.g. for Gregorian DAY_OF_MONTH,
* 31.
*
* @param field The given time field.
* @return The maximum value for the given time field.
* @stable ICU 2.6.
*/
virtual int32_t getMaximum(UCalendarDateFields field) const;
/**
* Gets the highest minimum value for the given field if varies. Otherwise same as
* getMinimum(). For Gregorian, no difference.
*
* @param field The given time field.
* @return The highest minimum value for the given time field.
* @deprecated ICU 2.6. Use getGreatestMinimum(UCalendarDateFields field) instead.
*/
virtual int32_t getGreatestMinimum(EDateFields field) const;
/**
* Gets the highest minimum value for the given field if varies. Otherwise same as
* getMinimum(). For Gregorian, no difference.
*
* @param field The given time field.
* @return The highest minimum value for the given time field.
* @stable ICU 2.6.
*/
virtual int32_t getGreatestMinimum(UCalendarDateFields field) const;
/**
* Gets the lowest maximum value for the given field if varies. Otherwise same as
* getMaximum(). e.g., for Gregorian DAY_OF_MONTH, 28.
*
* @param field The given time field.
* @return The lowest maximum value for the given time field.
* @deprecated ICU 2.6. Use getLeastMaximum(UCalendarDateFields field) instead.
*/
virtual int32_t getLeastMaximum(EDateFields field) const;
/**
* Gets the lowest maximum value for the given field if varies. Otherwise same as
* getMaximum(). e.g., for Gregorian DAY_OF_MONTH, 28.
*
* @param field The given time field.
* @return The lowest maximum value for the given time field.
* @stable ICU 2.6.
*/
virtual int32_t getLeastMaximum(UCalendarDateFields field) const;
#ifndef U_HIDE_DEPRECATED_API
/**
* Return the minimum value that this field could have, given the current date.
* For the Gregorian calendar, this is the same as getMinimum() and getGreatestMinimum().
*
* The version of this function on Calendar uses an iterative algorithm to determine the
* actual minimum value for the field. There is almost always a more efficient way to
* accomplish this (in most cases, you can simply return getMinimum()). GregorianCalendar
* overrides this function with a more efficient implementation.
*
* @param field the field to determine the minimum of
* @param status Fill-in parameter which receives the status of this operation.
* @return the minimum of the given field for the current date of this Calendar
* @deprecated ICU 2.6. Use getActualMinimum(UCalendarDateFields field, UErrorCode& status) instead.
*/
int32_t getActualMinimum(EDateFields field, UErrorCode& status) const;
#endif /* U_HIDE_DEPRECATED_API */
/**
* Return the minimum value that this field could have, given the current date.
* For the Gregorian calendar, this is the same as getMinimum() and getGreatestMinimum().
*
* The version of this function on Calendar uses an iterative algorithm to determine the
* actual minimum value for the field. There is almost always a more efficient way to
* accomplish this (in most cases, you can simply return getMinimum()). GregorianCalendar
* overrides this function with a more efficient implementation.
*
* @param field the field to determine the minimum of
* @param status Fill-in parameter which receives the status of this operation.
* @return the minimum of the given field for the current date of this Calendar
* @stable ICU 2.6.
*/
virtual int32_t getActualMinimum(UCalendarDateFields field, UErrorCode& status) const;
#ifndef U_HIDE_DEPRECATED_API
/**
* Return the maximum value that this field could have, given the current date.
* For example, with the date "Feb 3, 1997" and the DAY_OF_MONTH field, the actual
* maximum would be 28; for "Feb 3, 1996" it s 29. Similarly for a Hebrew calendar,
* for some years the actual maximum for MONTH is 12, and for others 13.
*
* The version of this function on Calendar uses an iterative algorithm to determine the
* actual maximum value for the field. There is almost always a more efficient way to
* accomplish this (in most cases, you can simply return getMaximum()). GregorianCalendar
* overrides this function with a more efficient implementation.
*
* @param field the field to determine the maximum of
* @param status Fill-in parameter which receives the status of this operation.
* @return the maximum of the given field for the current date of this Calendar
* @deprecated ICU 2.6. Use getActualMaximum(UCalendarDateFields field, UErrorCode& status) instead.
*/
int32_t getActualMaximum(EDateFields field, UErrorCode& status) const;
#endif /* U_HIDE_DEPRECATED_API */
/**
* Return the maximum value that this field could have, given the current date.
* For example, with the date "Feb 3, 1997" and the DAY_OF_MONTH field, the actual
* maximum would be 28; for "Feb 3, 1996" it s 29. Similarly for a Hebrew calendar,
* for some years the actual maximum for MONTH is 12, and for others 13.
*
* The version of this function on Calendar uses an iterative algorithm to determine the
* actual maximum value for the field. There is almost always a more efficient way to
* accomplish this (in most cases, you can simply return getMaximum()). GregorianCalendar
* overrides this function with a more efficient implementation.
*
* @param field the field to determine the maximum of
* @param status Fill-in parameter which receives the status of this operation.
* @return the maximum of the given field for the current date of this Calendar
* @stable ICU 2.6.
*/
virtual int32_t getActualMaximum(UCalendarDateFields field, UErrorCode& status) const;
#ifndef U_HIDE_DEPRECATED_API
/**
* Gets the value for a given time field. Recalculate the current time field values
* if the time value has been changed by a call to setTime(). Return zero for unset
* fields if any fields have been explicitly set by a call to set(). To force a
* recomputation of all fields regardless of the previous state, call complete().
* This method is semantically const, but may alter the object in memory.
*
* @param field The given time field.
* @param status Fill-in parameter which receives the status of the operation.
* @return The value for the given time field, or zero if the field is unset,
* and set() has been called for any other field.
* @deprecated ICU 2.6. Use get(UCalendarDateFields field, UErrorCode& status) instead.
*/
int32_t get(EDateFields field, UErrorCode& status) const;
#endif /* U_HIDE_DEPRECATED_API */
/**
* Gets the value for a given time field. Recalculate the current time field values
* if the time value has been changed by a call to setTime(). Return zero for unset
* fields if any fields have been explicitly set by a call to set(). To force a
* recomputation of all fields regardless of the previous state, call complete().
* This method is semantically const, but may alter the object in memory.
*
* @param field The given time field.
* @param status Fill-in parameter which receives the status of the operation.
* @return The value for the given time field, or zero if the field is unset,
* and set() has been called for any other field.
* @stable ICU 2.6.
*/
int32_t get(UCalendarDateFields field, UErrorCode& status) const;
#ifndef U_HIDE_DEPRECATED_API
/**
* Determines if the given time field has a value set. This can affect in the
* resolving of time in Calendar. Unset fields have a value of zero, by definition.
*
* @param field The given time field.
* @return True if the given time field has a value set; false otherwise.
* @deprecated ICU 2.6. Use isSet(UCalendarDateFields field) instead.
*/
UBool isSet(EDateFields field) const;
#endif /* U_HIDE_DEPRECATED_API */
/**
* Determines if the given time field has a value set. This can affect in the
* resolving of time in Calendar. Unset fields have a value of zero, by definition.
*
* @param field The given time field.
* @return True if the given time field has a value set; false otherwise.
* @stable ICU 2.6.
*/
UBool isSet(UCalendarDateFields field) const;
#ifndef U_HIDE_DEPRECATED_API
/**
* Sets the given time field with the given value.
*
* @param field The given time field.
* @param value The value to be set for the given time field.
* @deprecated ICU 2.6. Use set(UCalendarDateFields field, int32_t value) instead.
*/
void set(EDateFields field, int32_t value);
#endif /* U_HIDE_DEPRECATED_API */
/**
* Sets the given time field with the given value.
*
* @param field The given time field.
* @param value The value to be set for the given time field.
* @stable ICU 2.6.
*/
void set(UCalendarDateFields field, int32_t value);
/**
* Sets the values for the fields YEAR, MONTH, and DATE. Other field values are
* retained; call clear() first if this is not desired.
*
* @param year The value used to set the YEAR time field.
* @param month The value used to set the MONTH time field. Month value is 0-based.
* e.g., 0 for January.
* @param date The value used to set the DATE time field.
* @stable ICU 2.0
*/
void set(int32_t year, int32_t month, int32_t date);
/**
* Sets the values for the fields YEAR, MONTH, DATE, HOUR_OF_DAY, and MINUTE. Other
* field values are retained; call clear() first if this is not desired.
*
* @param year The value used to set the YEAR time field.
* @param month The value used to set the MONTH time field. Month value is
* 0-based. E.g., 0 for January.
* @param date The value used to set the DATE time field.
* @param hour The value used to set the HOUR_OF_DAY time field.
* @param minute The value used to set the MINUTE time field.
* @stable ICU 2.0
*/
void set(int32_t year, int32_t month, int32_t date, int32_t hour, int32_t minute);
/**
* Sets the values for the fields YEAR, MONTH, DATE, HOUR_OF_DAY, MINUTE, and SECOND.
* Other field values are retained; call clear() first if this is not desired.
*
* @param year The value used to set the YEAR time field.
* @param month The value used to set the MONTH time field. Month value is
* 0-based. E.g., 0 for January.
* @param date The value used to set the DATE time field.
* @param hour The value used to set the HOUR_OF_DAY time field.
* @param minute The value used to set the MINUTE time field.
* @param second The value used to set the SECOND time field.
* @stable ICU 2.0
*/
void set(int32_t year, int32_t month, int32_t date, int32_t hour, int32_t minute, int32_t second);
/**
* Clears the values of all the time fields, making them both unset and assigning
* them a value of zero. The field values will be determined during the next
* resolving of time into time fields.
* @stable ICU 2.0
*/
void clear(void);
#ifndef U_HIDE_DEPRECATED_API
/**
* Clears the value in the given time field, both making it unset and assigning it a
* value of zero. This field value will be determined during the next resolving of
* time into time fields.
*
* @param field The time field to be cleared.
* @deprecated ICU 2.6. Use clear(UCalendarDateFields field) instead.
*/
void clear(EDateFields field);
#endif /* U_HIDE_DEPRECATED_API */
/**
* Clears the value in the given time field, both making it unset and assigning it a
* value of zero. This field value will be determined during the next resolving of
* time into time fields.
*
* @param field The time field to be cleared.
* @stable ICU 2.6.
*/
void clear(UCalendarDateFields field);
/**
* Returns a unique class ID POLYMORPHICALLY. Pure virtual method. This method is to
* implement a simple version of RTTI, since not all C++ compilers support genuine
* RTTI. Polymorphic operator==() and clone() methods call this method.
*
* Concrete subclasses of Calendar must implement getDynamicClassID() and also a * static method and data member: * * static UClassID getStaticClassID() { return (UClassID)&fgClassID; } * static char fgClassID; * * @return The class ID for this object. All objects of a given class have the * same class ID. Objects of other classes have different class IDs. * @stable ICU 2.0 */ virtual UClassID getDynamicClassID(void) const = 0; /** * Returns the calendar type name string for this Calendar object. * The returned string is the legacy ICU calendar attribute value, * for example, "gregorian" or "japanese". * * See type="old type name" for the calendar attribute of locale IDs * at http://www.unicode.org/reports/tr35/#Key_Type_Definitions * * Sample code for getting the LDML/BCP 47 calendar key value: * \code * const char *calType = cal->getType(); * if (0 == strcmp(calType, "unknown")) { * // deal with unknown calendar type * } else { * string localeID("root@calendar="); * localeID.append(calType); * char langTag[100]; * UErrorCode errorCode = U_ZERO_ERROR; * int32_t length = uloc_toLanguageTag(localeID.c_str(), langTag, (int32_t)sizeof(langTag), TRUE, &errorCode); * if (U_FAILURE(errorCode)) { * // deal with errors & overflow * } * string lang(langTag, length); * size_t caPos = lang.find("-ca-"); * lang.erase(0, caPos + 4); * // lang now contains the LDML calendar type * } * \endcode * * @return legacy calendar type name string * @draft ICU 49 */ virtual const char * getType() const = 0; /** * Returns whether the given day of the week is a weekday, a * weekend day, or a day that transitions from one to the other, * in this calendar system. If a transition occurs at midnight, * then the days before and after the transition will have the * type UCAL_WEEKDAY or UCAL_WEEKEND. If a transition occurs at a time * other than midnight, then the day of the transition will have * the type UCAL_WEEKEND_ONSET or UCAL_WEEKEND_CEASE. In this case, the * method getWeekendTransition() will return the point of * transition. * @param dayOfWeek The day of the week whose type is desired (UCAL_SUNDAY..UCAL_SATURDAY). * @param status The error code for the operation. * @return The UCalendarWeekdayType for the day of the week. * @stable ICU 4.4 */ virtual UCalendarWeekdayType getDayOfWeekType(UCalendarDaysOfWeek dayOfWeek, UErrorCode &status) const; /** * Returns the time during the day at which the weekend begins or ends in * this calendar system. If getDayOfWeekType() rerturns UCAL_WEEKEND_ONSET * for the specified dayOfWeek, return the time at which the weekend begins. * If getDayOfWeekType() returns UCAL_WEEKEND_CEASE for the specified dayOfWeek, * return the time at which the weekend ends. If getDayOfWeekType() returns * some other UCalendarWeekdayType for the specified dayOfWeek, is it an error condition * (U_ILLEGAL_ARGUMENT_ERROR). * @param dayOfWeek The day of the week for which the weekend transition time is * desired (UCAL_SUNDAY..UCAL_SATURDAY). * @param status The error code for the operation. * @return The milliseconds after midnight at which the weekend begins or ends. * @stable ICU 4.4 */ virtual int32_t getWeekendTransition(UCalendarDaysOfWeek dayOfWeek, UErrorCode &status) const; /** * Returns TRUE if the given UDate is in the weekend in * this calendar system. * @param date The UDate in question. * @param status The error code for the operation. * @return TRUE if the given UDate is in the weekend in * this calendar system, FALSE otherwise. * @stable ICU 4.4 */ virtual UBool isWeekend(UDate date, UErrorCode &status) const; /** * Returns TRUE if this Calendar's current date-time is in the weekend in * this calendar system. * @return TRUE if this Calendar's current date-time is in the weekend in * this calendar system, FALSE otherwise. * @stable ICU 4.4 */ virtual UBool isWeekend(void) const; protected: /** * Constructs a Calendar with the default time zone as returned by * TimeZone::createInstance(), and the default locale. * * @param success Indicates the status of Calendar object construction. Returns * U_ZERO_ERROR if constructed successfully. * @stable ICU 2.0 */ Calendar(UErrorCode& success); /** * Copy constructor * * @param source Calendar object to be copied from * @stable ICU 2.0 */ Calendar(const Calendar& source); /** * Default assignment operator * * @param right Calendar object to be copied * @stable ICU 2.0 */ Calendar& operator=(const Calendar& right); /** * Constructs a Calendar with the given time zone and locale. Clients are no longer * responsible for deleting the given time zone object after it's adopted. * * @param zone The given time zone. * @param aLocale The given locale. * @param success Indicates the status of Calendar object construction. Returns * U_ZERO_ERROR if constructed successfully. * @stable ICU 2.0 */ Calendar(TimeZone* zone, const Locale& aLocale, UErrorCode& success); /** * Constructs a Calendar with the given time zone and locale. * * @param zone The given time zone. * @param aLocale The given locale. * @param success Indicates the status of Calendar object construction. Returns * U_ZERO_ERROR if constructed successfully. * @stable ICU 2.0 */ Calendar(const TimeZone& zone, const Locale& aLocale, UErrorCode& success); /** * Converts Calendar's time field values to GMT as milliseconds. * * @param status Output param set to success/failure code on exit. If any value * previously set in the time field is invalid or restricted by * leniency, this will be set to an error status. * @stable ICU 2.0 */ virtual void computeTime(UErrorCode& status); /** * Converts GMT as milliseconds to time field values. This allows you to sync up the * time field values with a new time that is set for the calendar. This method * does NOT recompute the time first; to recompute the time, then the fields, use * the method complete(). * * @param status Output param set to success/failure code on exit. If any value * previously set in the time field is invalid or restricted by * leniency, this will be set to an error status. * @stable ICU 2.0 */ virtual void computeFields(UErrorCode& status); /** * Gets this Calendar's current time as a long. * * @param status Output param set to success/failure code on exit. If any value * previously set in the time field is invalid or restricted by * leniency, this will be set to an error status. * @return the current time as UTC milliseconds from the epoch. * @stable ICU 2.0 */ double getTimeInMillis(UErrorCode& status) const; /** * Sets this Calendar's current time from the given long value. * @param millis the new time in UTC milliseconds from the epoch. * @param status Output param set to success/failure code on exit. If any value * previously set in the time field is invalid or restricted by * leniency, this will be set to an error status. * @stable ICU 2.0 */ void setTimeInMillis( double millis, UErrorCode& status ); /** * Recomputes the current time from currently set fields, and then fills in any * unset fields in the time field list. * * @param status Output param set to success/failure code on exit. If any value * previously set in the time field is invalid or restricted by * leniency, this will be set to an error status. * @stable ICU 2.0 */ void complete(UErrorCode& status); #ifndef U_HIDE_DEPRECATED_API /** * Gets the value for a given time field. Subclasses can use this function to get * field values without forcing recomputation of time. * * @param field The given time field. * @return The value for the given time field. * @deprecated ICU 2.6. Use internalGet(UCalendarDateFields field) instead. */ inline int32_t internalGet(EDateFields field) const {return fFields[field];} #endif /* U_HIDE_DEPRECATED_API */ #ifndef U_HIDE_INTERNAL_API /** * Gets the value for a given time field. Subclasses can use this function to get * field values without forcing recomputation of time. If the field's stamp is UNSET, * the defaultValue is used. * * @param field The given time field. * @param defaultValue a default value used if the field is unset. * @return The value for the given time field. * @internal */ inline int32_t internalGet(UCalendarDateFields field, int32_t defaultValue) const {return fStamp[field]>kUnset ? fFields[field] : defaultValue;} /** * Gets the value for a given time field. Subclasses can use this function to get * field values without forcing recomputation of time. * * @param field The given time field. * @return The value for the given time field. * @internal */ inline int32_t internalGet(UCalendarDateFields field) const {return fFields[field];} #endif /* U_HIDE_INTERNAL_API */ #ifndef U_HIDE_DEPRECATED_API /** * Sets the value for a given time field. This is a fast internal method for * subclasses. It does not affect the areFieldsInSync, isTimeSet, or areAllFieldsSet * flags. * * @param field The given time field. * @param value The value for the given time field. * @deprecated ICU 2.6. Use internalSet(UCalendarDateFields field, int32_t value) instead. */ void internalSet(EDateFields field, int32_t value); #endif /* U_HIDE_DEPRECATED_API */ /** * Sets the value for a given time field. This is a fast internal method for * subclasses. It does not affect the areFieldsInSync, isTimeSet, or areAllFieldsSet * flags. * * @param field The given time field. * @param value The value for the given time field. * @stable ICU 2.6. */ inline void internalSet(UCalendarDateFields field, int32_t value); /** * Prepare this calendar for computing the actual minimum or maximum. * This method modifies this calendar's fields; it is called on a * temporary calendar. * @internal */ virtual void prepareGetActual(UCalendarDateFields field, UBool isMinimum, UErrorCode &status); /** * Limit enums. Not in sync with UCalendarLimitType (refers to internal fields). * @internal */ enum ELimitType { UCAL_LIMIT_MINIMUM = 0, UCAL_LIMIT_GREATEST_MINIMUM, UCAL_LIMIT_LEAST_MAXIMUM, UCAL_LIMIT_MAXIMUM, UCAL_LIMIT_COUNT }; /** * Subclass API for defining limits of different types. * Subclasses must implement this method to return limits for the * following fields: * *
UCAL_ERA
* UCAL_YEAR
* UCAL_MONTH
* UCAL_WEEK_OF_YEAR
* UCAL_WEEK_OF_MONTH
* UCAL_DATE (DAY_OF_MONTH on Java)
* UCAL_DAY_OF_YEAR
* UCAL_DAY_OF_WEEK_IN_MONTH
* UCAL_YEAR_WOY
* UCAL_EXTENDED_YEAR
*
* @param field one of the above field numbers
* @param limitType one of MINIMUM, GREATEST_MINIMUM,
* LEAST_MAXIMUM, or MAXIMUM
* @internal
*/
virtual int32_t handleGetLimit(UCalendarDateFields field, ELimitType limitType) const = 0;
/**
* Return a limit for a field.
* @param field the field, from 0..UCAL_MAX_FIELD
* @param limitType the type specifier for the limit
* @see #ELimitType
* @internal
*/
virtual int32_t getLimit(UCalendarDateFields field, ELimitType limitType) const;
/**
* Return the Julian day number of day before the first day of the
* given month in the given extended year. Subclasses should override
* this method to implement their calendar system.
* @param eyear the extended year
* @param month the zero-based month, or 0 if useMonth is false
* @param useMonth if false, compute the day before the first day of
* the given year, otherwise, compute the day before the first day of
* the given month
* @return the Julian day number of the day before the first
* day of the given month and year
* @internal
*/
virtual int32_t handleComputeMonthStart(int32_t eyear, int32_t month,
UBool useMonth) const = 0;
/**
* Return the number of days in the given month of the given extended
* year of this calendar system. Subclasses should override this
* method if they can provide a more correct or more efficient
* implementation than the default implementation in Calendar.
* @internal
*/
virtual int32_t handleGetMonthLength(int32_t extendedYear, int32_t month) const ;
/**
* Return the number of days in the given extended year of this
* calendar system. Subclasses should override this method if they can
* provide a more correct or more efficient implementation than the
* default implementation in Calendar.
* @stable ICU 2.0
*/
virtual int32_t handleGetYearLength(int32_t eyear) const;
/**
* Return the extended year defined by the current fields. This will
* use the UCAL_EXTENDED_YEAR field or the UCAL_YEAR and supra-year fields (such
* as UCAL_ERA) specific to the calendar system, depending on which set of
* fields is newer.
* @return the extended year
* @internal
*/
virtual int32_t handleGetExtendedYear() = 0;
/**
* Subclasses may override this. This method calls
* handleGetMonthLength() to obtain the calendar-specific month
* length.
* @param bestField which field to use to calculate the date
* @return julian day specified by calendar fields.
* @internal
*/
virtual int32_t handleComputeJulianDay(UCalendarDateFields bestField);
/**
* Subclasses must override this to convert from week fields
* (YEAR_WOY and WEEK_OF_YEAR) to an extended year in the case
* where YEAR, EXTENDED_YEAR are not set.
* The Calendar implementation assumes yearWoy is in extended gregorian form
* @internal
* @return the extended year, UCAL_EXTENDED_YEAR
*/
virtual int32_t handleGetExtendedYearFromWeekFields(int32_t yearWoy, int32_t woy);
#ifndef U_HIDE_INTERNAL_API
/**
* Compute the Julian day from fields. Will determine whether to use
* the JULIAN_DAY field directly, or other fields.
* @return the julian day
* @internal
*/
int32_t computeJulianDay();
/**
* Compute the milliseconds in the day from the fields. This is a
* value from 0 to 23:59:59.999 inclusive, unless fields are out of
* range, in which case it can be an arbitrary value. This value
* reflects local zone wall time.
* @internal
*/
int32_t computeMillisInDay();
/**
* This method can assume EXTENDED_YEAR has been set.
* @param millis milliseconds of the date fields
* @param millisInDay milliseconds of the time fields; may be out
* or range.
* @param ec Output param set to failure code on function return
* when this function fails.
* @internal
*/
int32_t computeZoneOffset(double millis, int32_t millisInDay, UErrorCode &ec);
/**
* Determine the best stamp in a range.
* @param start first enum to look at
* @param end last enum to look at
* @param bestSoFar stamp prior to function call
* @return the stamp value of the best stamp
* @internal
*/
int32_t newestStamp(UCalendarDateFields start, UCalendarDateFields end, int32_t bestSoFar) const;
/**
* Values for field resolution tables
* @see #resolveFields
* @internal
*/
enum {
/** Marker for end of resolve set (row or group). */
kResolveSTOP = -1,
/** Value to be bitwised "ORed" against resolve table field values for remapping. Example: (UCAL_DATE | kResolveRemap) in 1st column will cause 'UCAL_DATE' to be returned, but will not examine the value of UCAL_DATE. */
kResolveRemap = 32
};
/**
* Precedence table for Dates
* @see #resolveFields
* @internal
*/
static const UFieldResolutionTable kDatePrecedence[];
/**
* Precedence table for Year
* @see #resolveFields
* @internal
*/
static const UFieldResolutionTable kYearPrecedence[];
/**
* Precedence table for Day of Week
* @see #resolveFields
* @internal
*/
static const UFieldResolutionTable kDOWPrecedence[];
/**
* Given a precedence table, return the newest field combination in
* the table, or UCAL_FIELD_COUNT if none is found.
*
* The precedence table is a 3-dimensional array of integers. It * may be thought of as an array of groups. Each group is an array of * lines. Each line is an array of field numbers. Within a line, if * all fields are set, then the time stamp of the line is taken to be * the stamp of the most recently set field. If any field of a line is * unset, then the line fails to match. Within a group, the line with * the newest time stamp is selected. The first field of the line is * returned to indicate which line matched. * *
In some cases, it may be desirable to map a line to field that
* whose stamp is NOT examined. For example, if the best field is
* DAY_OF_WEEK then the DAY_OF_WEEK_IN_MONTH algorithm may be used. In
* order to do this, insert the value kResolveRemap | F at
* the start of the line, where F is the desired return
* field value. This field will NOT be examined; it only determines
* the return value if the other fields in the line are the newest.
*
*
If all lines of a group contain at least one unset field, then no * line will match, and the group as a whole will fail to match. In * that case, the next group will be processed. If all groups fail to * match, then UCAL_FIELD_COUNT is returned. * @internal */ UCalendarDateFields resolveFields(const UFieldResolutionTable *precedenceTable); #endif /* U_HIDE_INTERNAL_API */ /** * @internal */ virtual const UFieldResolutionTable* getFieldResolutionTable() const; #ifndef U_HIDE_INTERNAL_API /** * Return the field that is newer, either defaultField, or * alternateField. If neither is newer or neither is set, return defaultField. * @internal */ UCalendarDateFields newerField(UCalendarDateFields defaultField, UCalendarDateFields alternateField) const; #endif /* U_HIDE_INTERNAL_API */ private: /** * Helper function for calculating limits by trial and error * @param field The field being investigated * @param startValue starting (least max) value of field * @param endValue ending (greatest max) value of field * @param status return type * @internal */ int32_t getActualHelper(UCalendarDateFields field, int32_t startValue, int32_t endValue, UErrorCode &status) const; protected: /** * The flag which indicates if the current time is set in the calendar. * @stable ICU 2.0 */ UBool fIsTimeSet; /** * True if the fields are in sync with the currently set time of this Calendar. * If false, then the next attempt to get the value of a field will * force a recomputation of all fields from the current value of the time * field. *
* This should really be named areFieldsInSync, but the old name is retained * for backward compatibility. * @stable ICU 2.0 */ UBool fAreFieldsSet; /** * True if all of the fields have been set. This is initially false, and set to * true by computeFields(). * @stable ICU 2.0 */ UBool fAreAllFieldsSet; /** * True if all fields have been virtually set, but have not yet been * computed. This occurs only in setTimeInMillis(). A calendar set * to this state will compute all fields from the time if it becomes * necessary, but otherwise will delay such computation. * @stable ICU 3.0 */ UBool fAreFieldsVirtuallySet; /** * Get the current time without recomputing. * * @return the current time without recomputing. * @stable ICU 2.0 */ UDate internalGetTime(void) const { return fTime; } /** * Set the current time without affecting flags or fields. * * @param time The time to be set * @return the current time without recomputing. * @stable ICU 2.0 */ void internalSetTime(UDate time) { fTime = time; } /** * The time fields containing values into which the millis is computed. * @stable ICU 2.0 */ int32_t fFields[UCAL_FIELD_COUNT]; /** * The flags which tell if a specified time field for the calendar is set. * @deprecated ICU 2.8 use (fStamp[n]!=kUnset) */ UBool fIsSet[UCAL_FIELD_COUNT]; /** Special values of stamp[] * @stable ICU 2.0 */ enum { kUnset = 0, kInternallySet, kMinimumUserStamp }; /** * Pseudo-time-stamps which specify when each field was set. There * are two special values, UNSET and INTERNALLY_SET. Values from * MINIMUM_USER_SET to Integer.MAX_VALUE are legal user set values. * @stable ICU 2.0 */ int32_t fStamp[UCAL_FIELD_COUNT]; /** * Subclasses may override this method to compute several fields * specific to each calendar system. These are: * *
In addition, subclasses should compute any subclass-specific * fields, that is, fields from BASE_FIELD_COUNT to * getFieldCount() - 1. * *
The default implementation in Calendar implements
* a pure proleptic Gregorian calendar.
* @internal
*/
virtual void handleComputeFields(int32_t julianDay, UErrorCode &status);
#ifndef U_HIDE_INTERNAL_API
/**
* Return the extended year on the Gregorian calendar as computed by
* computeGregorianFields().
* @internal
*/
int32_t getGregorianYear() const {
return fGregorianYear;
}
/**
* Return the month (0-based) on the Gregorian calendar as computed by
* computeGregorianFields().
* @internal
*/
int32_t getGregorianMonth() const {
return fGregorianMonth;
}
/**
* Return the day of year (1-based) on the Gregorian calendar as
* computed by computeGregorianFields().
* @internal
*/
int32_t getGregorianDayOfYear() const {
return fGregorianDayOfYear;
}
/**
* Return the day of month (1-based) on the Gregorian calendar as
* computed by computeGregorianFields().
* @internal
*/
int32_t getGregorianDayOfMonth() const {
return fGregorianDayOfMonth;
}
#endif /* U_HIDE_INTERNAL_API */
/**
* Called by computeJulianDay. Returns the default month (0-based) for the year,
* taking year and era into account. Defaults to 0 for Gregorian, which doesn't care.
* @param eyear The extended year
* @internal
*/
virtual int32_t getDefaultMonthInYear(int32_t eyear) ;
/**
* Called by computeJulianDay. Returns the default day (1-based) for the month,
* taking currently-set year and era into account. Defaults to 1 for Gregorian.
* @param eyear the extended year
* @param month the month in the year
* @internal
*/
virtual int32_t getDefaultDayInMonth(int32_t eyear, int32_t month);
//-------------------------------------------------------------------------
// Protected utility methods for use by subclasses. These are very handy
// for implementing add, roll, and computeFields.
//-------------------------------------------------------------------------
/**
* Adjust the specified field so that it is within
* the allowable range for the date to which this calendar is set.
* For example, in a Gregorian calendar pinning the {@link #UCalendarDateFields DAY_OF_MONTH}
* field for a calendar set to April 31 would cause it to be set
* to April 30.
*
* Subclassing:
*
* This utility method is intended for use by subclasses that need to implement
* their own overrides of {@link #roll roll} and {@link #add add}.
*
* Note:
* pinField is implemented in terms of
* {@link #getActualMinimum getActualMinimum}
* and {@link #getActualMaximum getActualMaximum}. If either of those methods uses
* a slow, iterative algorithm for a particular field, it would be
* unwise to attempt to call pinField for that field. If you
* really do need to do so, you should override this method to do
* something more efficient for that field.
*
* @param field The calendar field whose value should be pinned. * @param status Output param set to failure code on function return * when this function fails. * * @see #getActualMinimum * @see #getActualMaximum * @stable ICU 2.0 */ virtual void pinField(UCalendarDateFields field, UErrorCode& status); /** * Return the week number of a day, within a period. This may be the week number in * a year or the week number in a month. Usually this will be a value >= 1, but if * some initial days of the period are excluded from week 1, because * {@link #getMinimalDaysInFirstWeek getMinimalDaysInFirstWeek} is > 1, then * the week number will be zero for those * initial days. This method requires the day number and day of week for some * known date in the period in order to determine the day of week * on the desired day. *
* Subclassing:
*
* This method is intended for use by subclasses in implementing their
* {@link #computeTime computeTime} and/or {@link #computeFields computeFields} methods.
* It is often useful in {@link #getActualMinimum getActualMinimum} and
* {@link #getActualMaximum getActualMaximum} as well.
*
* This variant is handy for computing the week number of some other * day of a period (often the first or last day of the period) when its day * of the week is not known but the day number and day of week for some other * day in the period (e.g. the current date) is known. *
* @param desiredDay The {@link #UCalendarDateFields DAY_OF_YEAR} or
* {@link #UCalendarDateFields DAY_OF_MONTH} whose week number is desired.
* Should be 1 for the first day of the period.
*
* @param dayOfPeriod The {@link #UCalendarDateFields DAY_OF_YEAR}
* or {@link #UCalendarDateFields DAY_OF_MONTH} for a day in the period whose
* {@link #UCalendarDateFields DAY_OF_WEEK} is specified by the
* knownDayOfWeek parameter.
* Should be 1 for first day of period.
*
* @param dayOfWeek The {@link #UCalendarDateFields DAY_OF_WEEK} for the day
* corresponding to the knownDayOfPeriod parameter.
* 1-based with 1=Sunday.
*
* @return The week number (one-based), or zero if the day falls before
* the first week because
* {@link #getMinimalDaysInFirstWeek getMinimalDaysInFirstWeek}
* is more than one.
*
* @stable ICU 2.8
*/
int32_t weekNumber(int32_t desiredDay, int32_t dayOfPeriod, int32_t dayOfWeek);
#ifndef U_HIDE_INTERNAL_API
/**
* Return the week number of a day, within a period. This may be the week number in
* a year, or the week number in a month. Usually this will be a value >= 1, but if
* some initial days of the period are excluded from week 1, because
* {@link #getMinimalDaysInFirstWeek getMinimalDaysInFirstWeek} is > 1,
* then the week number will be zero for those
* initial days. This method requires the day of week for the given date in order to
* determine the result.
*
* Subclassing:
*
* This method is intended for use by subclasses in implementing their
* {@link #computeTime computeTime} and/or {@link #computeFields computeFields} methods.
* It is often useful in {@link #getActualMinimum getActualMinimum} and
* {@link #getActualMaximum getActualMaximum} as well.
*
* @param dayOfPeriod The {@link #UCalendarDateFields DAY_OF_YEAR} or
* {@link #UCalendarDateFields DAY_OF_MONTH} whose week number is desired.
* Should be 1 for the first day of the period.
*
* @param dayOfWeek The {@link #UCalendarDateFields DAY_OF_WEEK} for the day
* corresponding to the dayOfPeriod parameter.
* 1-based with 1=Sunday.
*
* @return The week number (one-based), or zero if the day falls before
* the first week because
* {@link #getMinimalDaysInFirstWeek getMinimalDaysInFirstWeek}
* is more than one.
* @internal
*/
inline int32_t weekNumber(int32_t dayOfPeriod, int32_t dayOfWeek);
/**
* returns the local DOW, valid range 0..6
* @internal
*/
int32_t getLocalDOW();
#endif /* U_HIDE_INTERNAL_API */
private:
/**
* The next available value for fStamp[]
*/
int32_t fNextStamp;// = MINIMUM_USER_STAMP;
/**
* Recalculates the time stamp array (fStamp).
* Resets fNextStamp to lowest next stamp value.
*/
void recalculateStamp();
/**
* The current time set for the calendar.
*/
UDate fTime;
/**
* @see #setLenient
*/
UBool fLenient;
/**
* Time zone affects the time calculation done by Calendar. Calendar subclasses use
* the time zone data to produce the local time.
*/
TimeZone* fZone;
/**
* Option for rpeated wall time
* @see #setRepeatedWallTimeOption
*/
UCalendarWallTimeOption fRepeatedWallTime;
/**
* Option for skipped wall time
* @see #setSkippedWallTimeOption
*/
UCalendarWallTimeOption fSkippedWallTime;
/**
* Both firstDayOfWeek and minimalDaysInFirstWeek are locale-dependent. They are
* used to figure out the week count for a specific date for a given locale. These
* must be set when a Calendar is constructed. For example, in US locale,
* firstDayOfWeek is SUNDAY; minimalDaysInFirstWeek is 1. They are used to figure
* out the week count for a specific date for a given locale. These must be set when
* a Calendar is constructed.
*/
UCalendarDaysOfWeek fFirstDayOfWeek;
uint8_t fMinimalDaysInFirstWeek;
UCalendarDaysOfWeek fWeekendOnset;
int32_t fWeekendOnsetMillis;
UCalendarDaysOfWeek fWeekendCease;
int32_t fWeekendCeaseMillis;
/**
* Sets firstDayOfWeek and minimalDaysInFirstWeek. Called at Calendar construction
* time.
*
* @param desiredLocale The given locale.
* @param type The calendar type identifier, e.g: gregorian, buddhist, etc.
* @param success Indicates the status of setting the week count data from
* the resource for the given locale. Returns U_ZERO_ERROR if
* constructed successfully.
*/
void setWeekData(const Locale& desiredLocale, const char *type, UErrorCode& success);
/**
* Recompute the time and update the status fields isTimeSet
* and areFieldsSet. Callers should check isTimeSet and only
* call this method if isTimeSet is false.
*
* @param status Output param set to success/failure code on exit. If any value
* previously set in the time field is invalid or restricted by
* leniency, this will be set to an error status.
*/
void updateTime(UErrorCode& status);
/**
* The Gregorian year, as computed by computeGregorianFields() and
* returned by getGregorianYear().
* @see #computeGregorianFields
*/
int32_t fGregorianYear;
/**
* The Gregorian month, as computed by computeGregorianFields() and
* returned by getGregorianMonth().
* @see #computeGregorianFields
*/
int32_t fGregorianMonth;
/**
* The Gregorian day of the year, as computed by
* computeGregorianFields() and returned by getGregorianDayOfYear().
* @see #computeGregorianFields
*/
int32_t fGregorianDayOfYear;
/**
* The Gregorian day of the month, as computed by
* computeGregorianFields() and returned by getGregorianDayOfMonth().
* @see #computeGregorianFields
*/
int32_t fGregorianDayOfMonth;
/* calculations */
/**
* Compute the Gregorian calendar year, month, and day of month from
* the given Julian day. These values are not stored in fields, but in
* member variables gregorianXxx. Also compute the DAY_OF_WEEK and
* DOW_LOCAL fields.
*/
void computeGregorianAndDOWFields(int32_t julianDay, UErrorCode &ec);
protected:
/**
* Compute the Gregorian calendar year, month, and day of month from the
* Julian day. These values are not stored in fields, but in member
* variables gregorianXxx. They are used for time zone computations and by
* subclasses that are Gregorian derivatives. Subclasses may call this
* method to perform a Gregorian calendar millis->fields computation.
*/
void computeGregorianFields(int32_t julianDay, UErrorCode &ec);
private:
/**
* Compute the fields WEEK_OF_YEAR, YEAR_WOY, WEEK_OF_MONTH,
* DAY_OF_WEEK_IN_MONTH, and DOW_LOCAL from EXTENDED_YEAR, YEAR,
* DAY_OF_WEEK, and DAY_OF_YEAR. The latter fields are computed by the
* subclass based on the calendar system.
*
*
The YEAR_WOY field is computed simplistically. It is equal to YEAR
* most of the time, but at the year boundary it may be adjusted to YEAR-1
* or YEAR+1 to reflect the overlap of a week into an adjacent year. In
* this case, a simple increment or decrement is performed on YEAR, even
* though this may yield an invalid YEAR value. For instance, if the YEAR
* is part of a calendar system with an N-year cycle field CYCLE, then
* incrementing the YEAR may involve incrementing CYCLE and setting YEAR
* back to 0 or 1. This is not handled by this code, and in fact cannot be
* simply handled without having subclasses define an entire parallel set of
* fields for fields larger than or equal to a year. This additional
* complexity is not warranted, since the intention of the YEAR_WOY field is
* to support ISO 8601 notation, so it will typically be used with a
* proleptic Gregorian calendar, which has no field larger than a year.
*/
void computeWeekFields(UErrorCode &ec);
/**
* Ensure that each field is within its valid range by calling {@link
* #validateField(int, int&)} on each field that has been set. This method
* should only be called if this calendar is not lenient.
* @see #isLenient
* @see #validateField(int, int&)
* @internal
*/
void validateFields(UErrorCode &status);
/**
* Validate a single field of this calendar. Subclasses should
* override this method to validate any calendar-specific fields.
* Generic fields can be handled by
* Calendar::validateField().
* @see #validateField(int, int, int, int&)
* @internal
*/
virtual void validateField(UCalendarDateFields field, UErrorCode &status);
/**
* Validate a single field of this calendar given its minimum and
* maximum allowed value. If the field is out of range,
* U_ILLEGAL_ARGUMENT_ERROR will be set. Subclasses may
* use this method in their implementation of {@link
* #validateField(int, int&)}.
* @internal
*/
void validateField(UCalendarDateFields field, int32_t min, int32_t max, UErrorCode& status);
protected:
#ifndef U_HIDE_INTERNAL_API
/**
* Convert a quasi Julian date to the day of the week. The Julian date used here is
* not a true Julian date, since it is measured from midnight, not noon. Return
* value is one-based.
*
* @param julian The given Julian date number.
* @return Day number from 1..7 (SUN..SAT).
* @internal
*/
static uint8_t julianDayToDayOfWeek(double julian);
#endif /* U_HIDE_INTERNAL_API */
private:
char validLocale[ULOC_FULLNAME_CAPACITY];
char actualLocale[ULOC_FULLNAME_CAPACITY];
public:
#if !UCONFIG_NO_SERVICE
/**
* INTERNAL FOR 2.6 -- Registration.
*/
#ifndef U_HIDE_INTERNAL_API
/**
* Return a StringEnumeration over the locales available at the time of the call,
* including registered locales.
* @return a StringEnumeration over the locales available at the time of the call
* @internal
*/
static StringEnumeration* getAvailableLocales(void);
/**
* Register a new Calendar factory. The factory will be adopted.
* INTERNAL in 2.6
* @param toAdopt the factory instance to be adopted
* @param status the in/out status code, no special meanings are assigned
* @return a registry key that can be used to unregister this factory
* @internal
*/
static URegistryKey registerFactory(ICUServiceFactory* toAdopt, UErrorCode& status);
/**
* Unregister a previously-registered CalendarFactory using the key returned from the
* register call. Key becomes invalid after a successful call and should not be used again.
* The CalendarFactory corresponding to the key will be deleted.
* INTERNAL in 2.6
* @param key the registry key returned by a previous call to registerFactory
* @param status the in/out status code, no special meanings are assigned
* @return TRUE if the factory for the key was successfully unregistered
* @internal
*/
static UBool unregister(URegistryKey key, UErrorCode& status);
#endif /* U_HIDE_INTERNAL_API */
/**
* Multiple Calendar Implementation
* @internal
*/
friend class CalendarFactory;
/**
* Multiple Calendar Implementation
* @internal
*/
friend class CalendarService;
/**
* Multiple Calendar Implementation
* @internal
*/
friend class DefaultCalendarFactory;
#endif /* !UCONFIG_NO_SERVICE */
/**
* @internal
* @return TRUE if this calendar has a default century (i.e. 03 -> 2003)
*/
virtual UBool haveDefaultCentury() const = 0;
/**
* @internal
* @return the start of the default century, as a UDate
*/
virtual UDate defaultCenturyStart() const = 0;
/**
* @internal
* @return the beginning year of the default century, as a year
*/
virtual int32_t defaultCenturyStartYear() const = 0;
/** Get the locale for this calendar object. You can choose between valid and actual locale.
* @param type type of the locale we're looking for (valid or actual)
* @param status error code for the operation
* @return the locale
* @stable ICU 2.8
*/
Locale getLocale(ULocDataLocaleType type, UErrorCode &status) const;
#ifndef U_HIDE_INTERNAL_API
/** Get the locale for this calendar object. You can choose between valid and actual locale.
* @param type type of the locale we're looking for (valid or actual)
* @param status error code for the operation
* @return the locale
* @internal
*/
const char* getLocaleID(ULocDataLocaleType type, UErrorCode &status) const;
#endif /* U_HIDE_INTERNAL_API */
private:
/**
* Cast TimeZone used by this object to BasicTimeZone, or NULL if the TimeZone
* is not an instance of BasicTimeZone.
*/
BasicTimeZone* getBasicTimeZone() const;
};
// -------------------------------------
inline Calendar*
Calendar::createInstance(TimeZone* zone, UErrorCode& errorCode)
{
// since the Locale isn't specified, use the default locale
return createInstance(zone, Locale::getDefault(), errorCode);
}
// -------------------------------------
inline void
Calendar::roll(UCalendarDateFields field, UBool up, UErrorCode& status)
{
roll(field, (int32_t)(up ? +1 : -1), status);
}
#ifndef U_HIDE_DEPRECATED_API
inline void
Calendar::roll(EDateFields field, UBool up, UErrorCode& status)
{
roll((UCalendarDateFields) field, up, status);
}
#endif
// -------------------------------------
/**
* Fast method for subclasses. The caller must maintain fUserSetDSTOffset and
* fUserSetZoneOffset, as well as the isSet[] array.
*/
inline void
Calendar::internalSet(UCalendarDateFields field, int32_t value)
{
fFields[field] = value;
fStamp[field] = kInternallySet;
fIsSet[field] = TRUE; // Remove later
}
#ifndef U_HIDE_INTERNAL_API
inline int32_t Calendar::weekNumber(int32_t dayOfPeriod, int32_t dayOfWeek)
{
return weekNumber(dayOfPeriod, dayOfPeriod, dayOfWeek);
}
#endif
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_FORMATTING */
#endif // _CALENDAR