diff options
Diffstat (limited to 'intl/icu/source/i18n/unicode/calendar.h')
| -rw-r--r-- | intl/icu/source/i18n/unicode/calendar.h | 2551 |
1 files changed, 2551 insertions, 0 deletions
diff --git a/intl/icu/source/i18n/unicode/calendar.h b/intl/icu/source/i18n/unicode/calendar.h new file mode 100644 index 0000000000..2a8c2935ca --- /dev/null +++ b/intl/icu/source/i18n/unicode/calendar.h @@ -0,0 +1,2551 @@ +// © 2016 and later: Unicode, Inc. and others. +// License & terms of use: http://www.unicode.org/copyright.html +/* +******************************************************************************** +* Copyright (C) 1997-2014, International Business Machines +* Corporation and others. All Rights Reserved. +******************************************************************************** +* +* File CALENDAR.H +* +* Modification History: +* +* Date Name Description +* 04/22/97 aliu Expanded and corrected comments and other header +* contents. +* 05/01/97 aliu Made equals(), before(), after() arguments const. +* 05/20/97 aliu Replaced fAreFieldsSet with fAreFieldsInSync and +* fAreAllFieldsSet. +* 07/27/98 stephen Sync up with JDK 1.2 +* 11/15/99 weiv added YEAR_WOY and DOW_LOCAL +* to EDateFields +* 8/19/2002 srl Removed Javaisms +* 11/07/2003 srl Update, clean up documentation. +******************************************************************************** +*/ + +#ifndef CALENDAR_H +#define CALENDAR_H + +#include "unicode/utypes.h" + +#if U_SHOW_CPLUSPLUS_API + +/** + * \file + * \brief C++ API: Calendar object + */ +#if !UCONFIG_NO_FORMATTING + +#include "unicode/uobject.h" +#include "unicode/locid.h" +#include "unicode/timezone.h" +#include "unicode/ucal.h" +#include "unicode/umisc.h" + +U_NAMESPACE_BEGIN + +class ICUServiceFactory; + +/** + * @internal + */ +typedef int32_t UFieldResolutionTable[12][8]; + +class BasicTimeZone; +/** + * `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: + * + * Calendar *rightNow = Calendar::createInstance(errCode); + * + * 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. + * + * 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 + * + * For the time of day: + * + * HOUR_OF_DAY + * AM_PM + HOUR + * + * **Ambiguous Wall Clock Time.** When time offset from UTC has + * changed, it produces an 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 12:59 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 historical 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: + * + * 1. 24:00:00 "belongs" to the following day. That is, + * 23:59 on Dec 31, 1969 < 24:00 on Jan 1, 1970 < 24:01:00 on Jan 1, 1970 + * 2. Although historically not precise, midnight also belongs to "am", + * and noon belongs to "pm", so on the same day, + * 12:00 am (midnight) < 12:01 am, and 12:00 pm (noon) < 12:01 pm + * + * 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 `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. + * + * <p> + * The Japanese calendar uses a combination of era name and year number. + * When an emperor of Japan abdicates and a new emperor ascends the throne, + * a new era is declared and year number is reset to 1. Even if the date of + * abdication is scheduled ahead of time, the new era name might not be + * announced until just before the date. In such case, ICU4C may include + * a start date of future era without actual era name, but not enabled + * by default. ICU4C users who want to test the behavior of the future era + * can enable the tentative era by: + * <ul> + * <li>Environment variable <code>ICU_ENABLE_TENTATIVE_ERA=true</code>.</li> + * </ul> + * + * @stable ICU 2.0 + */ +class U_I18N_API Calendar : public UObject { +public: +#ifndef U_FORCE_HIDE_DEPRECATED_API + /** + * Field IDs for date and time. Used to specify date/time fields. ERA is calendar + * specific. Example ranges given are for illustration only; see specific Calendar + * subclasses for actual ranges. + * @deprecated ICU 2.6. Use C enum UCalendarDateFields defined in ucal.h + */ + enum EDateFields { +#ifndef U_HIDE_DEPRECATED_API +/* + * ERA may be defined on other platforms. To avoid any potential problems undefined it here. + */ +#ifdef ERA +#undef ERA +#endif + ERA, // Example: 0..1 + YEAR, // Example: 1..big number + MONTH, // Example: 0..11 + WEEK_OF_YEAR, // Example: 1..53 + WEEK_OF_MONTH, // Example: 1..4 + DATE, // Example: 1..31 + DAY_OF_YEAR, // Example: 1..365 + DAY_OF_WEEK, // Example: 1..7 + DAY_OF_WEEK_IN_MONTH, // Example: 1..4, may be specified as -1 + AM_PM, // Example: 0..1 + HOUR, // Example: 0..11 + HOUR_OF_DAY, // Example: 0..23 + MINUTE, // Example: 0..59 + SECOND, // Example: 0..59 + MILLISECOND, // Example: 0..999 + ZONE_OFFSET, // Example: -12*U_MILLIS_PER_HOUR..12*U_MILLIS_PER_HOUR + DST_OFFSET, // Example: 0 or U_MILLIS_PER_HOUR + YEAR_WOY, // 'Y' Example: 1..big number - Year of Week of Year + DOW_LOCAL, // 'e' Example: 1..7 - Day of Week / Localized + + EXTENDED_YEAR, + JULIAN_DAY, + MILLISECONDS_IN_DAY, + IS_LEAP_MONTH, + + FIELD_COUNT = UCAL_FIELD_COUNT // See ucal.h for other fields. +#endif /* U_HIDE_DEPRECATED_API */ + }; +#endif // U_FORCE_HIDE_DEPRECATED_API + +#ifndef U_HIDE_DEPRECATED_API + /** + * Useful constant for days of week. Note: Calendar day-of-week is 1-based. Clients + * who create locale resources for the field of first-day-of-week should be aware of + * this. For instance, in US locale, first-day-of-week is set to 1, i.e., SUNDAY. + * @deprecated ICU 2.6. Use C enum UCalendarDaysOfWeek defined in ucal.h + */ + enum EDaysOfWeek { + SUNDAY = 1, + MONDAY, + TUESDAY, + WEDNESDAY, + THURSDAY, + FRIDAY, + SATURDAY + }; + + /** + * Useful constants for month. Note: Calendar month is 0-based. + * @deprecated ICU 2.6. Use C enum UCalendarMonths defined in ucal.h + */ + enum EMonths { + JANUARY, + FEBRUARY, + MARCH, + APRIL, + MAY, + JUNE, + JULY, + AUGUST, + SEPTEMBER, + OCTOBER, + NOVEMBER, + DECEMBER, + UNDECIMBER + }; + + /** + * Useful constants for hour in 12-hour clock. Used in GregorianCalendar. + * @deprecated ICU 2.6. Use C enum UCalendarAMPMs defined in ucal.h + */ + enum EAmpm { + AM, + PM + }; +#endif /* U_HIDE_DEPRECATED_API */ + + /** + * destructor + * @stable ICU 2.0 + */ + virtual ~Calendar(); + + /** + * Create and return a polymorphic copy of this calendar. + * + * @return a polymorphic copy of this calendar. + * @stable ICU 2.0 + */ + virtual Calendar* clone() const = 0; + + /** + * Creates a Calendar using the default timezone and locale. Clients are responsible + * for deleting the object returned. + * + * @param success Indicates the success/failure of Calendar creation. Filled in + * with U_ZERO_ERROR if created successfully, set to a failure result + * otherwise. U_MISSING_RESOURCE_ERROR will be returned if the resource data + * requests a calendar type which has not been installed. + * @return A Calendar if created successfully. NULL otherwise. + * @stable ICU 2.0 + */ + static Calendar* U_EXPORT2 createInstance(UErrorCode& success); + + /** + * Creates a Calendar using the given timezone and the default locale. + * The Calendar takes ownership of zoneToAdopt; the + * client must not delete it. + * + * @param zoneToAdopt The given timezone to be adopted. + * @param success Indicates the success/failure of Calendar creation. Filled in + * with U_ZERO_ERROR if created successfully, set to a failure result + * otherwise. + * @return A Calendar if created successfully. NULL otherwise. + * @stable ICU 2.0 + */ + static Calendar* U_EXPORT2 createInstance(TimeZone* zoneToAdopt, UErrorCode& success); + + /** + * Creates a Calendar using the given timezone and the default locale. The TimeZone + * is _not_ adopted; the client is still responsible for deleting it. + * + * @param zone The timezone. + * @param success Indicates the success/failure of Calendar creation. Filled in + * with U_ZERO_ERROR if created successfully, set to a failure result + * otherwise. + * @return A Calendar if created successfully. NULL otherwise. + * @stable ICU 2.0 + */ + static Calendar* U_EXPORT2 createInstance(const TimeZone& zone, UErrorCode& success); + + /** + * Creates a Calendar using the default timezone and the given locale. + * + * @param aLocale The given locale. + * @param success Indicates the success/failure of Calendar creation. Filled in + * with U_ZERO_ERROR if created successfully, set to a failure result + * otherwise. + * @return A Calendar if created successfully. NULL otherwise. + * @stable ICU 2.0 + */ + static Calendar* U_EXPORT2 createInstance(const Locale& aLocale, UErrorCode& success); + + /** + * Creates a Calendar using the given timezone and given locale. + * The Calendar takes ownership of zoneToAdopt; the + * client must not delete it. + * + * @param zoneToAdopt The given timezone to be adopted. + * @param aLocale The given locale. + * @param success Indicates the success/failure of Calendar creation. Filled in + * with U_ZERO_ERROR if created successfully, set to a failure result + * otherwise. + * @return A Calendar if created successfully. NULL otherwise. + * @stable ICU 2.0 + */ + static Calendar* U_EXPORT2 createInstance(TimeZone* zoneToAdopt, const Locale& aLocale, UErrorCode& success); + + /** + * Gets a Calendar using the given timezone and given locale. The TimeZone + * is _not_ adopted; the client is still responsible for deleting it. + * + * @param zone The given timezone. + * @param aLocale The given locale. + * @param success Indicates the success/failure of Calendar creation. Filled in + * with U_ZERO_ERROR if created successfully, set to a failure result + * otherwise. + * @return A Calendar if created successfully. NULL otherwise. + * @stable ICU 2.0 + */ + static Calendar* U_EXPORT2 createInstance(const TimeZone& zone, const Locale& aLocale, UErrorCode& success); + + /** + * Returns a list of the locales for which Calendars are installed. + * + * @param count Number of locales returned. + * @return An array of Locale objects representing the set of locales for which + * Calendars are installed. The system retains ownership of this list; + * the caller must NOT delete it. Does not include user-registered Calendars. + * @stable ICU 2.0 + */ + static const Locale* U_EXPORT2 getAvailableLocales(int32_t& count); + + + /** + * Given a key and a locale, returns an array of string values in a preferred + * order that would make a difference. These are all and only those values where + * the open (creation) of the service with the locale formed from the input locale + * plus input keyword and that value has different behavior than creation with the + * input locale alone. + * @param key one of the keys supported by this service. For now, only + * "calendar" is supported. + * @param locale the locale + * @param commonlyUsed if set to true it will return only commonly used values + * with the given locale in preferred order. Otherwise, + * it will return all the available values for the locale. + * @param status ICU Error Code + * @return a string enumeration over keyword values for the given key and the locale. + * @stable ICU 4.2 + */ + static StringEnumeration* U_EXPORT2 getKeywordValuesForLocale(const char* key, + const Locale& locale, UBool commonlyUsed, UErrorCode& status); + + /** + * Returns the current UTC (GMT) time measured in milliseconds since 0:00:00 on 1/1/70 + * (derived from the system time). + * + * @return The current UTC time in milliseconds. + * @stable ICU 2.0 + */ + static UDate U_EXPORT2 getNow(void); + + /** + * Gets this Calendar's time as milliseconds. May involve recalculation of time due + * to previous calls to set time field values. The time specified is non-local UTC + * (GMT) time. Although this method is const, this object may actually be changed + * (semantically const). + * + * @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 in UTC (GMT) time, or zero if the operation + * failed. + * @stable ICU 2.0 + */ + inline UDate getTime(UErrorCode& status) const { return getTimeInMillis(status); } + + /** + * Sets this Calendar's current time with the given UDate. The time specified should + * be in non-local UTC (GMT) time. + * + * @param date The given UDate in UTC (GMT) time. + * @param status Output param set to success/failure code on exit. If any value + * set in the time field is invalid or restricted by + * leniency, this will be set to an error status. + * @stable ICU 2.0 + */ + inline void setTime(UDate date, UErrorCode& status) { setTimeInMillis(date, status); } + + /** + * Compares the equality of two Calendar objects. Objects of different subclasses + * are considered unequal. This comparison is very exacting; two Calendar objects + * must be in exactly the same state to be considered equal. To compare based on the + * represented time, use equals() instead. + * + * @param that The Calendar object to be compared with. + * @return True if the given Calendar is the same as this Calendar; false + * otherwise. + * @stable ICU 2.0 + */ + virtual UBool operator==(const Calendar& that) const; + + /** + * Compares the inequality of two Calendar objects. + * + * @param that The Calendar object to be compared with. + * @return True if the given Calendar is not the same as this Calendar; false + * otherwise. + * @stable ICU 2.0 + */ + UBool operator!=(const Calendar& that) const {return !operator==(that);} + + /** + * Returns TRUE if the given Calendar object is equivalent to this + * one. An equivalent Calendar will behave exactly as this one + * does, but it may be set to a different time. By contrast, for + * the operator==() method to return TRUE, the other Calendar must + * be set to the same time. + * + * @param other the Calendar to be compared with this Calendar + * @stable ICU 2.4 + */ + virtual UBool isEquivalentTo(const Calendar& other) const; + + /** + * Compares the Calendar time, whereas Calendar::operator== compares the equality of + * Calendar objects. + * + * @param when The Calendar to be compared with this Calendar. Although this is a + * const parameter, the object may be modified physically + * (semantically const). + * @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 True if the current time of this Calendar is equal to the time of + * Calendar when; false otherwise. + * @stable ICU 2.0 + */ + UBool equals(const Calendar& when, UErrorCode& status) const; + + /** + * Returns true if this Calendar's current time is before "when"'s current time. + * + * @param when The Calendar to be compared with this Calendar. Although this is a + * const parameter, the object may be modified physically + * (semantically const). + * @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 True if the current time of this Calendar is before the time of + * Calendar when; false otherwise. + * @stable ICU 2.0 + */ + UBool before(const Calendar& when, UErrorCode& status) const; + + /** + * Returns true if this Calendar's current time is after "when"'s current time. + * + * @param when The Calendar to be compared with this Calendar. Although this is a + * const parameter, the object may be modified physically + * (semantically const). + * @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 True if the current time of this Calendar is after the time of + * Calendar when; false otherwise. + * @stable ICU 2.0 + */ + UBool after(const Calendar& when, UErrorCode& status) const; + +#ifndef U_FORCE_HIDE_DEPRECATED_API + /** + * UDate Arithmetic function. Adds the specified (signed) amount of time to the given + * time field, based on the calendar's rules. For example, to subtract 5 days from + * the current time of the calendar, call add(Calendar::DATE, -5). When adding on + * the month or Calendar::MONTH field, other fields like date might conflict and + * need to be changed. For instance, adding 1 month on the date 01/31/96 will result + * in 02/29/96. + * Adding a positive value always means moving forward in time, so for the Gregorian calendar, + * starting with 100 BC and adding +1 to year results in 99 BC (even though this actually reduces + * the numeric value of the field itself). + * + * @param field Specifies which date field to modify. + * @param amount The amount of time to be added to the field, in the natural unit + * for that field (e.g., days for the day fields, hours for the hour + * field.) + * @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 add(UCalendarDateFields field, int32_t amount, UErrorCode& status) instead. + */ + virtual void add(EDateFields field, int32_t amount, UErrorCode& status); +#endif // U_FORCE_HIDE_DEPRECATED_API + + /** + * UDate Arithmetic function. Adds the specified (signed) amount of time to the given + * time field, based on the calendar's rules. For example, to subtract 5 days from + * the current time of the calendar, call add(Calendar::DATE, -5). When adding on + * the month or Calendar::MONTH field, other fields like date might conflict and + * need to be changed. For instance, adding 1 month on the date 01/31/96 will result + * in 02/29/96. + * Adding a positive value always means moving forward in time, so for the Gregorian calendar, + * starting with 100 BC and adding +1 to year results in 99 BC (even though this actually reduces + * the numeric value of the field itself). + * + * @param field Specifies which date field to modify. + * @param amount The amount of time to be added to the field, in the natural unit + * for that field (e.g., days for the day fields, hours for the hour + * field.) + * @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. + */ + virtual void add(UCalendarDateFields field, int32_t amount, UErrorCode& status); + +#ifndef 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. + * <P> + * 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. + * <P> + * 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); + +#ifndef U_FORCE_HIDE_DEPRECATED_API + /** + * 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. + * <P> + * 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); +#endif // U_FORCE_HIDE_DEPRECATED_API + + /** + * 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. + * <P> + * 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); + +#ifndef U_FORCE_HIDE_DEPRECATED_API + /** + * Return the difference between the given time and the time this + * calendar object is set to. If this calendar is set + * <em>before</em> the given time, the returned value will be + * positive. If this calendar is set <em>after</em> the given + * time, the returned value will be negative. The + * <code>field</code> parameter specifies the units of the return + * value. For example, if <code>fieldDifference(when, + * Calendar::MONTH)</code> returns 3, then this calendar is set to + * 3 months before <code>when</code>, and possibly some addition + * time less than one month. + * + * <p>As a side effect of this call, this calendar is advanced + * toward <code>when</code> by the given amount. That is, calling + * this method has the side effect of calling <code>add(field, + * n)</code>, where <code>n</code> is the return value. + * + * <p>Usage: To use this method, call it first with the largest + * field of interest, then with progressively smaller fields. For + * example: + * + * <pre> + * int y = cal->fieldDifference(when, Calendar::YEAR, err); + * int m = cal->fieldDifference(when, Calendar::MONTH, err); + * int d = cal->fieldDifference(when, Calendar::DATE, err);</pre> + * + * computes the difference between <code>cal</code> and + * <code>when</code> in years, months, and days. + * + * <p>Note: <code>fieldDifference()</code> is + * <em>asymmetrical</em>. That is, in the following code: + * + * <pre> + * 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);</pre> + * + * one might expect that <code>m1 == -m2 && d1 == -d2</code>. + * 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 <code>when</code>, in terms of + * <code>field</code>. + * @deprecated ICU 2.6. Use fieldDifference(UDate when, UCalendarDateFields field, UErrorCode& status). + */ + virtual int32_t fieldDifference(UDate when, EDateFields field, UErrorCode& status); +#endif // U_FORCE_HIDE_DEPRECATED_API + + /** + * Return the difference between the given time and the time this + * calendar object is set to. If this calendar is set + * <em>before</em> the given time, the returned value will be + * positive. If this calendar is set <em>after</em> the given + * time, the returned value will be negative. The + * <code>field</code> parameter specifies the units of the return + * value. For example, if <code>fieldDifference(when, + * Calendar::MONTH)</code> returns 3, then this calendar is set to + * 3 months before <code>when</code>, and possibly some addition + * time less than one month. + * + * <p>As a side effect of this call, this calendar is advanced + * toward <code>when</code> by the given amount. That is, calling + * this method has the side effect of calling <code>add(field, + * n)</code>, where <code>n</code> is the return value. + * + * <p>Usage: To use this method, call it first with the largest + * field of interest, then with progressively smaller fields. For + * example: + * + * <pre> + * int y = cal->fieldDifference(when, Calendar::YEAR, err); + * int m = cal->fieldDifference(when, Calendar::MONTH, err); + * int d = cal->fieldDifference(when, Calendar::DATE, err);</pre> + * + * computes the difference between <code>cal</code> and + * <code>when</code> in years, months, and days. + * + * <p>Note: <code>fieldDifference()</code> is + * <em>asymmetrical</em>. That is, in the following code: + * + * <pre> + * 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);</pre> + * + * one might expect that <code>m1 == -m2 && d1 == -d2</code>. + * 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 <code>when</code>, in terms of + * <code>field</code>. + * @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; + + /** + * 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 (America/New_York) occurs twice; + * 1:30 AM EDT, then 1:30 AM EST one hour later. When <code>UCAL_WALLTIME_FIRST</code> + * is used, the wall time 1:30AM in this example will be interpreted as 1:30 AM EDT + * (first occurrence). When <code>UCAL_WALLTIME_LAST</code> is used, it will be + * interpreted as 1:30 AM EST (last occurrence). The default value is + * <code>UCAL_WALLTIME_LAST</code>. + * <p> + * <b>Note:</b>When <code>UCAL_WALLTIME_NEXT_VALID</code> is not a valid + * option for this. When the argument is neither <code>UCAL_WALLTIME_FIRST</code> + * nor <code>UCAL_WALLTIME_LAST</code>, this method has no effect and will keep + * the current setting. + * + * @param option the behavior for handling repeating wall time, either + * <code>UCAL_WALLTIME_FIRST</code> or <code>UCAL_WALLTIME_LAST</code>. + * @see #getRepeatedWallTimeOption + * @stable 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 + * <code>UCAL_WALLTIME_FIRST</code> or <code>UCAL_WALLTIME_LAST</code>. + * @see #setRepeatedWallTimeOption + * @stable 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 + * <code>UCAL_WALLTIME_FIRST</code> 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 <code>UCAL_WALLTIME_LAST</code> + * 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 <code>UCAL_WALLTIME_NEXT_VALID</code> is used, 2:30 AM will + * be resolved as next valid wall time, that is 3:00 AM EDT. The default value is + * <code>UCAL_WALLTIME_LAST</code>. + * <p> + * <b>Note:</b>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 <code>UCAL_WALLTIME_FIRST</code>, <code>UCAL_WALLTIME_LAST</code> and + * <code>UCAL_WALLTIME_NEXT_VALID</code>. + * @see #getSkippedWallTimeOption + * + * @stable 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 + * <code>UCAL_WALLTIME_FIRST</code>, <code>UCAL_WALLTIME_LAST</code> + * and <code>UCAL_WALLTIME_NEXT_VALID</code>. + * @see #setSkippedWallTimeOption + * @stable ICU 49 + */ + UCalendarWallTimeOption getSkippedWallTimeOption(void) const; + +#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; + +#ifndef U_FORCE_HIDE_DEPRECATED_API + /** + * 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; +#endif // U_FORCE_HIDE_DEPRECATED_API + + /** + * 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; + +#ifndef U_FORCE_HIDE_DEPRECATED_API + /** + * 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; +#endif // U_FORCE_HIDE_DEPRECATED_API + + /** + * 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; + +#ifndef U_FORCE_HIDE_DEPRECATED_API + /** + * 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; +#endif // U_FORCE_HIDE_DEPRECATED_API + + /** + * 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; + +#ifndef U_FORCE_HIDE_DEPRECATED_API + /** + * 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; +#endif // U_FORCE_HIDE_DEPRECATED_API + + /** + * 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. + * <P> + * 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 + * @stable 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, for the locale and + * calendar system associated with this Calendar (the locale's region is + * often the most determinant factor). 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() returns 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 { +#ifndef U_HIDE_INTERNAL_API + UCAL_LIMIT_MINIMUM = 0, + UCAL_LIMIT_GREATEST_MINIMUM, + UCAL_LIMIT_LEAST_MAXIMUM, + UCAL_LIMIT_MAXIMUM, + UCAL_LIMIT_COUNT +#endif /* U_HIDE_INTERNAL_API */ + }; + + /** + * Subclass API for defining limits of different types. + * Subclasses must implement this method to return limits for the + * following fields: + * + * <pre>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</pre> + * + * @param field one of the above field numbers + * @param limitType one of <code>MINIMUM</code>, <code>GREATEST_MINIMUM</code>, + * <code>LEAST_MAXIMUM</code>, or <code>MAXIMUM</code> + * @internal + */ + virtual int32_t handleGetLimit(UCalendarDateFields field, ELimitType limitType) const = 0; + + /** + * Return a limit for a field. + * @param field the field, from <code>0..UCAL_MAX_FIELD</code> + * @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 + * @return the extended year, UCAL_EXTENDED_YEAR + * @internal + */ + virtual int32_t handleGetExtendedYearFromWeekFields(int32_t yearWoy, int32_t woy); + + /** + * 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()`. + * @internal + */ + virtual void validateField(UCalendarDateFields field, UErrorCode &status); + +#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 + */ + double 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, double 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. + * + * <p>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. + * + * <p>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 <code>kResolveRemap | F</code> at + * the start of the line, where <code>F</code> 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. + * + * <p>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. + * <P> + * 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]; + +#ifndef U_FORCE_HIDE_DEPRECATED_API + /** + * 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]; +#endif // U_FORCE_HIDE_DEPRECATED_API + + /** 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: + * + * <ul><li>ERA + * <li>YEAR + * <li>MONTH + * <li>DAY_OF_MONTH + * <li>DAY_OF_YEAR + * <li>EXTENDED_YEAR</ul> + * + * Subclasses can refer to the DAY_OF_WEEK and DOW_LOCAL fields, which + * will be set when this method is called. Subclasses can also call + * the getGregorianXxx() methods to obtain Gregorian calendar + * equivalents for the given Julian day. + * + * <p>In addition, subclasses should compute any subclass-specific + * fields, that is, fields from BASE_FIELD_COUNT to + * getFieldCount() - 1. + * + * <p>The default implementation in <code>Calendar</code> 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 + * <code>computeGregorianFields()</code>. + * @internal + */ + int32_t getGregorianYear() const { + return fGregorianYear; + } + + /** + * Return the month (0-based) on the Gregorian calendar as computed by + * <code>computeGregorianFields()</code>. + * @internal + */ + int32_t getGregorianMonth() const { + return fGregorianMonth; + } + + /** + * Return the day of year (1-based) on the Gregorian calendar as + * computed by <code>computeGregorianFields()</code>. + * @internal + */ + int32_t getGregorianDayOfYear() const { + return fGregorianDayOfYear; + } + + /** + * Return the day of month (1-based) on the Gregorian calendar as + * computed by <code>computeGregorianFields()</code>. + * @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. + * <p> + * <b>Subclassing:</b> + * <br> + * This utility method is intended for use by subclasses that need to implement + * their own overrides of {@link #roll roll} and {@link #add add}. + * <p> + * <b>Note:</b> + * <code>pinField</code> 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 <code>pinField</code> for that field. If you + * really do need to do so, you should override this method to do + * something more efficient for that field. + * <p> + * @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. + * <p> + * <b>Subclassing:</b> + * <br> + * 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. + * <p> + * 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) <em>is</em> known. + * <p> + * @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 + * <code>knownDayOfWeek</code> parameter. + * Should be 1 for first day of period. + * + * @param dayOfWeek The {@link #UCalendarDateFields DAY_OF_WEEK} for the day + * corresponding to the <code>knownDayOfPeriod</code> 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. + * <p> + * <b>Subclassing:</b> + * <br> + * 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. + * <p> + * @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 <code>dayOfPeriod</code> 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. Always set; never NULL. + */ + TimeZone* fZone; + + /** + * Option for repeated 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. + * + * <p>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&) + */ + void validateFields(UErrorCode &status); + + /** + * Validate a single field of this calendar given its minimum and + * maximum allowed value. If the field is out of range, + * <code>U_ILLEGAL_ARGUMENT_ERROR</code> will be set. Subclasses may + * use this method in their implementation of {@link + * #validateField(int, int&)}. + */ + 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 + * + * Because ICU may choose to cache Calendars internally, this must + * be called at application startup, prior to any calls to + * Calendar::createInstance to avoid undefined behavior. + * + * @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 + * + * Because ICU may choose to cache Calendars internally, this should + * be called during application shutdown, after all calls to + * Calendar::createInstance to avoid undefined behavior. + * + * @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 */ + + /** + * @return TRUE if this calendar has a default century (i.e. 03 -> 2003) + * @internal + */ + virtual UBool haveDefaultCentury() const = 0; + + /** + * @return the start of the default century, as a UDate + * @internal + */ + virtual UDate defaultCenturyStart() const = 0; + /** + * @return the beginning year of the default century, as a year + * @internal + */ + 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; + + /** + * @return The related Gregorian year; will be obtained by modifying the value + * obtained by get from UCAL_EXTENDED_YEAR field + * @internal + */ + virtual int32_t getRelatedYear(UErrorCode &status) const; + + /** + * @param year The related Gregorian year to set; will be modified as necessary then + * set in UCAL_EXTENDED_YEAR field + * @internal + */ + virtual void setRelatedYear(int32_t year); + +#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; + + /** + * Find the previous zone transition near the given time. + * @param base The base time, inclusive + * @param transitionTime Receives the result time + * @param status The error status + * @return TRUE if a transition is found. + */ + UBool getImmediatePreviousZoneTransition(UDate base, UDate *transitionTime, UErrorCode& status) const; + +public: +#ifndef U_HIDE_INTERNAL_API + /** + * Creates a new Calendar from a Locale for the cache. + * This method does not set the time or timezone in returned calendar. + * @param locale the locale. + * @param status any error returned here. + * @return the new Calendar object with no time or timezone set. + * @internal For ICU use only. + */ + static Calendar * U_EXPORT2 makeInstance( + const Locale &locale, UErrorCode &status); + + /** + * Get the calendar type for given locale. + * @param locale the locale + * @param typeBuffer calendar type returned here + * @param typeBufferSize The size of typeBuffer in bytes. If the type + * can't fit in the buffer, this method sets status to + * U_BUFFER_OVERFLOW_ERROR + * @param status error, if any, returned here. + * @internal For ICU use only. + */ + static void U_EXPORT2 getCalendarTypeFromLocale( + const Locale &locale, + char *typeBuffer, + int32_t typeBufferSize, + UErrorCode &status); +#endif /* U_HIDE_INTERNAL_API */ +}; + +// ------------------------------------- + +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 /* U_HIDE_DEPRECATED_API */ + + +// ------------------------------------- + +/** + * 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_HIDE_INTERNAL_API */ + +U_NAMESPACE_END + +#endif /* #if !UCONFIG_NO_FORMATTING */ + +#endif /* U_SHOW_CPLUSPLUS_API */ + +#endif // _CALENDAR |