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scuffed-code/icu4c/source/i18n/unicode/calendar.h
Steven R. Loomis 11b61d3c06 ICU-2424 change resolveFields to not use an illegal enum value 
X-SVN-Rev: 13952
2003-12-03 00:11:17 +00:00

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/*
********************************************************************************
* Copyright (C) 1997-2003, 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 !UCONFIG_NO_FORMATTING
#include "unicode/uobject.h"
#include "unicode/locid.h"
#include "unicode/timezone.h"
#include "unicode/ucal.h"
U_NAMESPACE_BEGIN
class ICUServiceFactory;
/**
* @internal
*/
typedef const void* URegistryKey;
/**
* @internal
*/
typedef int32_t UFieldResolutionTable[12][8];
/**
* <code>Calendar</code> is an abstract base class for converting between
* a <code>UDate</code> object and a set of integer fields such as
* <code>YEAR</code>, <code>MONTH</code>, <code>DAY</code>, <code>HOUR</code>,
* and so on. (A <code>UDate</code> object represents a specific instant in
* time with millisecond precision. See UDate
* for information about the <code>UDate</code> class.)
*
* <p>
* Subclasses of <code>Calendar</code> interpret a <code>UDate</code>
* according to the rules of a specific calendar system.
* The most commonly used subclass of <code>Calendar</code> is
* <code>GregorianCalendar</code>. Other subclasses could represent
* the various types of lunar calendars in use in many parts of the world.
*
* <p>
* <b>NOTE</b>: (ICU 2.6) The subclass interface should be considered unstable
* - it WILL change.
*
* <p>
* Like other locale-sensitive classes, <code>Calendar</code> provides a
* static method, <code>createInstance</code>, for getting a generally useful
* object of this type. <code>Calendar</code>'s <code>createInstance</code> method
* returns the appropriate <code>Calendar</code> subclass whose
* time fields have been initialized with the current date and time:
* <blockquote>
* <pre>
* Calendar *rightNow = Calendar::createInstance(errCode);
* </pre>
* </blockquote>
*
* <p>
* A <code>Calendar</code> 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).
*
* <p>
* When computing a <code>UDate</code> from time fields, two special circumstances
* may arise: there may be insufficient information to compute the
* <code>UDate</code> (such as only year and month but no day in the month),
* or there may be inconsistent information (such as "Tuesday, July 15, 1996"
* -- July 15, 1996 is actually a Monday).
*
* <p>
* <strong>Insufficient information.</strong> 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.
*
* <p>
* <strong>Inconsistent information.</strong> 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.
*
* <blockquote>
* <pre>
* 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
* </pre>
* </blockquote>
*
* For the time of day:
*
* <blockquote>
* <pre>
* HOUR_OF_DAY
* AM_PM + HOUR
* </pre>
* </blockquote>
*
* <p>
* <strong>Note:</strong> for some non-Gregorian calendars, different
* fields may be necessary for complete disambiguation. For example, a full
* specification of the historial Arabic astronomical calendar requires year,
* month, day-of-month <em>and</em> day-of-week in some cases.
*
* <p>
* <strong>Note:</strong> There are certain possible ambiguities in
* interpretation of certain singular times, which are resolved in the
* following ways:
* <ol>
* <li> 24:00:00 "belongs" to the following day. That is,
* 23:59 on Dec 31, 1969 &lt; 24:00 on Jan 1, 1970 &lt; 24:01:00 on Jan 1, 1970
*
* <li> Although historically not precise, midnight also belongs to "am",
* and noon belongs to "pm", so on the same day,
* 12:00 am (midnight) &lt; 12:01 am, and 12:00 pm (noon) &lt; 12:01 pm
* </ol>
*
* <p>
* The date or time format strings are not part of the definition of a
* calendar, as those must be modifiable or overridable by the user at
* runtime. Use {@link DateFormat}
* to format dates.
*
* <p>
* <code>Calendar</code> 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 <code>December 12, <b>1996</b></code> results in
* <code>January 12, <b>1996</b></code>.
*
* <p>
* <code>Calendar</code> 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 <code>September 12, 1996</code>
* results in <code>September 7, 1996</code>.
*
* @stable ICU 2.0
*/
class U_I18N_API Calendar : public UObject {
public:
/**
* 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 {
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
FIELD_COUNT = UCAL_FIELD_COUNT // See ucal.h for other fields.
};
/**
* 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
};
/**
* 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(void) 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* 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* 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* 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* 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* 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 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* createInstance(const TimeZone& zoneToAdopt, 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* getAvailableLocales(int32_t& count);
/**
* 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 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
* @draft 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;
/**
* 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.
*
* @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);
/**
* 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.
*
* @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.
* @draft ICU 2.6.
*/
virtual void add(UCalendarDateFields field, int32_t amount, UErrorCode& status);
/**
* 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; e.g., rolling the year
* up on "100 BC" will result in "99 BC", for Gregorian calendar. 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);
/**
* 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; e.g., rolling the year
* up on "100 BC" will result in "99 BC", for Gregorian calendar. 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.
* @draft ICU 2.6.
*/
inline void roll(UCalendarDateFields field, UBool up, UErrorCode& status);
/**
* Time Field Rolling function. Rolls by the given amount on the given
* time field. For example, to roll the current date up by one day, call
* roll(Calendar::DATE, +1, status). When rolling on the month or
* Calendar::MONTH field, other fields like date might conflict and, need to be
* changed. For instance, rolling the month up on the date 01/31/96 will result in
* 02/29/96. Rolling by a positive value always means rolling forward in time;
* e.g., rolling the year by +1 on "100 BC" will result in "99 BC", for Gregorian
* calendar. 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);
/**
* 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;
* e.g., rolling the year by +1 on "100 BC" will result in "99 BC", for Gregorian
* calendar. 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.
* @draft ICU 2.6.
*/
virtual void roll(UCalendarDateFields field, int32_t amount, UErrorCode& status);
/**
* Return the difference between the given time and the time this
* calendar object is set to. If this calendar is set
* <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);
/**
* 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>.
* @draft 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 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);
/**
* 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.
* @draft ICU 2.6.
*/
void setFirstDayOfWeek(UCalendarDaysOfWeek value);
/**
* 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;
/**
* 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.
* @draft ICU 2.6
*/
UCalendarDaysOfWeek getFirstDayOfWeek(UErrorCode &status) const;
/**
* Sets what the minimal days required in the first week of the year are; For
* example, if the first week is defined as one that contains the first day of the
* first month of a year, call the method with value 1. If it must be a full week,
* use value 7.
*
* @param value The given minimal days required in the first week of the year.
* @stable ICU 2.0
*/
void setMinimalDaysInFirstWeek(uint8_t value);
/**
* Gets what the minimal days required in the first week of the year are; e.g., if
* the first week is defined as one that contains the first day of the first month
* of a year, getMinimalDaysInFirstWeek returns 1. If the minimal days required must
* be a full week, getMinimalDaysInFirstWeek returns 7.
*
* @return The minimal days required in the first week of the year.
* @stable ICU 2.0
*/
uint8_t getMinimalDaysInFirstWeek(void) const;
/**
* Gets the minimum value for the given time field. e.g., for Gregorian
* DAY_OF_MONTH, 1.
*
* @param field The given time field.
* @return The minimum value for the given time field.
* @deprecated ICU 2.6. Use getMinimum(UCalendarDateFields field) instead.
*/
virtual int32_t getMinimum(EDateFields field) const;
/**
* Gets the minimum value for the given time field. e.g., for Gregorian
* DAY_OF_MONTH, 1.
*
* @param field The given time field.
* @return The minimum value for the given time field.
* @draft ICU 2.6.
*/
virtual int32_t getMinimum(UCalendarDateFields field) const;
/**
* Gets the maximum value for the given time field. e.g. for Gregorian DAY_OF_MONTH,
* 31.
*
* @param field The given time field.
* @return The maximum value for the given time field.
* @deprecated ICU 2.6. Use getMaximum(UCalendarDateFields field) instead.
*/
virtual int32_t getMaximum(EDateFields field) const;
/**
* Gets the maximum value for the given time field. e.g. for Gregorian DAY_OF_MONTH,
* 31.
*
* @param field The given time field.
* @return The maximum value for the given time field.
* @draft ICU 2.6.
*/
virtual int32_t getMaximum(UCalendarDateFields field) const;
/**
* Gets the highest minimum value for the given field if varies. Otherwise same as
* getMinimum(). For Gregorian, no difference.
*
* @param field The given time field.
* @return The highest minimum value for the given time field.
* @deprecated ICU 2.6. Use getGreatestMinimum(UCalendarDateFields field) instead.
*/
virtual int32_t getGreatestMinimum(EDateFields field) const;
/**
* Gets the highest minimum value for the given field if varies. Otherwise same as
* getMinimum(). For Gregorian, no difference.
*
* @param field The given time field.
* @return The highest minimum value for the given time field.
* @draft ICU 2.6.
*/
virtual int32_t getGreatestMinimum(UCalendarDateFields field) const;
/**
* Gets the lowest maximum value for the given field if varies. Otherwise same as
* getMaximum(). e.g., for Gregorian DAY_OF_MONTH, 28.
*
* @param field The given time field.
* @return The lowest maximum value for the given time field.
* @deprecated ICU 2.6. Use getLeastMaximum(UCalendarDateFields field) instead.
*/
virtual int32_t getLeastMaximum(EDateFields field) const;
/**
* Gets the lowest maximum value for the given field if varies. Otherwise same as
* getMaximum(). e.g., for Gregorian DAY_OF_MONTH, 28.
*
* @param field The given time field.
* @return The lowest maximum value for the given time field.
* @draft ICU 2.6.
*/
virtual int32_t getLeastMaximum(UCalendarDateFields field) const;
/**
* 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;
/**
* 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
* @draft ICU 2.6.
*/
int32_t getActualMinimum(UCalendarDateFields field, UErrorCode& status) const;
/**
* 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;
/**
* 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
* @draft ICU 2.6.
*/
int32_t getActualMaximum(UCalendarDateFields field, UErrorCode& status) const;
/**
* 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;
/**
* 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.
* @draft ICU 2.6.
*/
int32_t get(UCalendarDateFields field, UErrorCode& status) const;
/**
* 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;
/**
* 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.
* @draft ICU 2.6.
*/
UBool isSet(UCalendarDateFields field) const;
/**
* 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);
/**
* 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.
* @draft 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);
/**
* 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);
/**
* 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.
* @draft 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 resource key string used for this calendar type.
* For example, prepending "Eras_" to this string could return "Eras_japanese"
* or "Eras_gregorian".
*
* @returns static string, for example, "gregorian" or "japanese"
* @internal
*/
virtual const char * getType() const = 0;
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);
/**
* 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];}
/**
* 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];}
/**
* 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);
/**
* 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.
* @draft 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 UCalendarLimitTypes (refers to internal fields).
* @internal
*/
enum ELimitType {
UCAL_LIMIT_MINIMUM = 0,
UCAL_LIMIT_GREATEST_MINIMUM,
UCAL_LIMIT_LEAST_MAXIMUM,
UCAL_LIMIT_MAXIMUM,
UCAL_LIMIT_COUNT
};
/**
* Subclass API for defining limits of different types.
* Subclasses must implement this method to return limits for the
* following fields:
*
* <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 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
* @param return the Julian day number of the day before the first
* day of the given month and year
* @internal
*/
virtual int32_t handleComputeMonthStart(int32_t eyear, int32_t month,
UBool useMonth) const = 0;
/**
* Return the number of days in the given month of the given extended
* year of this calendar system. Subclasses should override this
* method if they can provide a more correct or more efficient
* implementation than the default implementation in Calendar.
* @internal
*/
virtual int32_t handleGetMonthLength(int32_t extendedYear, int32_t month) const ;
/**
* Return the number of days in the given extended year of this
* calendar system. Subclasses should override this method if they can
* provide a more correct or more efficient implementation than the
* default implementation in Calendar.
* @stable ICU 2.0
*/
virtual int32_t handleGetYearLength(int32_t eyear) const;
/**
* Return the extended year defined by the current fields. This will
* use the UCAL_EXTENDED_YEAR field or the UCAL_YEAR and supra-year fields (such
* as UCAL_ERA) specific to the calendar system, depending on which set of
* fields is newer.
* @return the extended year
* @internal
*/
virtual int32_t handleGetExtendedYear() = 0;
/**
* Subclasses may override this. This method calls
* handleGetMonthLength() to obtain the calendar-specific month
* length.
* @param bestField which field to use to calculate the date
* @return julian day specified by calendar fields.
* @internal
*/
virtual int32_t handleComputeJulianDay(UCalendarDateFields bestField);
/**
* Subclasses must override this to convert from week fields
* (YEAR_WOY and WEEK_OF_YEAR) to an extended year in the case
* where YEAR, EXTENDED_YEAR are not set.
* The Calendar implementation assumes yearWoy is in extended gregorian form
* @internal
* @return the extended year, UCAL_EXTENDED_YEAR
*/
virtual int32_t handleGetExtendedYearFromWeekFields(int32_t yearWoy, int32_t woy);
/**
* Compute the Julian day from fields. Will determine whether to use
* the JULIAN_DAY field directly, or other fields.
* @return the julian day
* @internal
*/
int32_t computeJulianDay();
/**
* Compute the milliseconds in the day from the fields. This is a
* value from 0 to 23:59:59.999 inclusive, unless fields are out of
* range, in which case it can be an arbitrary value. This value
* reflects local zone wall time.
* @internal
*/
int32_t computeMillisInDay();
/**
* This method can assume EXTENDED_YEAR has been set.
* @param millis milliseconds of the date fields
* @param millisInDay milliseconds of the time fields; may be out
* or range.
* @internal
*/
int32_t computeZoneOffset(double millis, int32_t millisInDay, UErrorCode &ec);
/**
* Determine the best stamp in a range.
* @param start first enum to look at
* @param end last enum to look at
* @param best 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);
virtual const UFieldResolutionTable* getFieldResolutionTable() const;
/**
* 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;
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;
/**
* Get the current time without recomputing.
*
* @return the current time without recomputing.
* @stable ICU 2.0
*/
UDate internalGetTime(void) const { return fTime; }
/**
* Set the current time without affecting flags or fields.
*
* @param time The time to be set
* @return the current time without recomputing.
* @stable ICU 2.0
*/
void internalSetTime(UDate time) { fTime = time; }
/**
* The time fields containing values into which the millis is computed.
* @stable ICU 2.0
*/
int32_t fFields[UCAL_FIELD_COUNT];
/**
* The flags which tell if a specified time field for the calendar is set.
* @deprecated ICU 2.8 use (fStamp[n]!=kUnset)
*/
UBool fIsSet[UCAL_FIELD_COUNT];
/** Special values of stamp[]
* @stable ICU 2.0
*/
enum {
kUnset = 0,
kInternallySet,
kMinimumUserStamp
};
/**
* Pseudo-time-stamps which specify when each field was set. There
* are two special values, UNSET and INTERNALLY_SET. Values from
* MINIMUM_USER_SET to Integer.MAX_VALUE are legal user set values.
* @stable ICU 2.0
*/
int32_t fStamp[UCAL_FIELD_COUNT];
/**
* Subclasses may override this method to compute several fields
* specific to each calendar system. These are:
*
* <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);
/**
* Return the extended year on the Gregorian calendar as computed by
* <code>computeGregorianFields()</code>.
* @see #computeGregorianFields
* @internal
*/
int32_t getGregorianYear() const {
return fGregorianYear;
}
/**
* Return the month (0-based) on the Gregorian calendar as computed by
* <code>computeGregorianFields()</code>.
* @see #computeGregorianFields
* @internal
*/
int32_t getGregorianMonth() const {
return fGregorianMonth;
}
/**
* Return the day of year (1-based) on the Gregorian calendar as
* computed by <code>computeGregorianFields()</code>.
* @see #computeGregorianFields
* @internal
*/
int32_t getGregorianDayOfYear() const {
return fGregorianDayOfYear;
}
/**
* Return the day of month (1-based) on the Gregorian calendar as
* computed by <code>computeGregorianFields()</code>.
* @see #computeGregorianFields
* @internal
*/
int32_t getGregorianDayOfMonth() const {
return fGregorianDayOfMonth;
}
/**
* 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.
* @internal
* @internal
*/
virtual int32_t getDefaultMonthInYear() ;
/**
* 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.
* @internal
*/
virtual int32_t getDefaultDayInMonth(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 #DAY_OF_MONTH 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.
*
* @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 #DAY_OF_YEAR DAY_OF_YEAR} or
* {@link #DAY_OF_MONTH DAY_OF_MONTH} whose week number is desired.
* Should be 1 for the first day of the period.
*
* @param knownDayOfPeriod The {@link #DAY_OF_YEAR DAY_OF_YEAR}
* or {@link #DAY_OF_MONTH DAY_OF_MONTH} for a day in the period whose
* {@link #DAY_OF_WEEK DAY_OF_WEEK} is specified by the
* <code>knownDayOfWeek</code> parameter.
* Should be 1 for first day of period.
*
* @param knownDayOfWeek The {@link #DAY_OF_WEEK 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.
*/
int32_t weekNumber(int32_t desiredDay, int32_t dayOfPeriod, int32_t dayOfWeek);
/**
* 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 #DAY_OF_YEAR DAY_OF_YEAR} or
* {@link #DAY_OF_MONTH DAY_OF_MONTH} whose week number is desired.
* Should be 1 for the first day of the period.
*
* @param dayofWeek The {@link #DAY_OF_WEEK 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();
private:
/**
* The next available value for fStamp[]
*/
int32_t fNextStamp;// = MINIMUM_USER_STAMP;
/**
* The current time set for the calendar.
*/
UDate fTime;
/**
* @see #setLenient
*/
UBool fLenient;
/**
* Time zone affects the time calculation done by Calendar. Calendar subclasses use
* the time zone data to produce the local time.
*/
TimeZone* fZone;
/**
* 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;
/**
* Sets firstDayOfWeek and minimalDaysInFirstWeek. Called at Calendar construction
* time.
*
* @param desiredLocale The given locale.
* @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 setWeekCountData(const Locale& desiredLocale, 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 resource tag for the resource where the week-count data is stored.
*/
static const char kDateTimeElements[];
/**
* The resource tag where the default calendar is stored.
*/
static const char kDefaultCalendar[];
/**
* The Gregorian year, as computed by computeGregorianFields() and
* returned by getGregorianYear().
*/
int32_t fGregorianYear;
/**
* The Gregorian month, as computed by computeGregorianFields() and
* returned by getGregorianMonth().
*/
int32_t fGregorianMonth;
/**
* The Gregorian day of the year, as computed by
* computeGregorianFields() and returned by getGregorianDayOfYear().
*/
int32_t fGregorianDayOfYear;
/**
* The Gregorian day of the month, as computed by
* computeGregorianFields() and returned by getGregorianDayOfMonth().
*/
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);
/**
* 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.
* To perform a Gregorian calendar fields->millis computation, call
* computeGregorianMonthStart().
* @see #computeGregorianMonthStart
*/
void computeGregorianFields(int32_t julianDay, UErrorCode &ec);
/**
* 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)} on each field that has been set. This method
* should only be called if this calendar is not lenient.
* @see #isLenient
* @see #validateField(int)
* @internal
*/
void validateFields(UErrorCode &status);
/**
* Validate a single field of this calendar. Subclasses should
* override this method to validate any calendar-specific fields.
* Generic fields can be handled by
* <code>Calendar.validateField()</code>.
* @see #validateField(int, int, int)
* @internal
*/
virtual void validateField(UCalendarDateFields field, UErrorCode &status);
/**
* Validate a single field of this calendar given its minimum and
* maximum allowed value. If the field is out of range,
* <code>U_ILLEGAL_ARGUMENT_ERROR</code> will be set. Subclasses may
* use this method in their implementation of {@link
* #validateField(int)}.
* @internal
*/
void validateField(UCalendarDateFields field, int32_t min, int32_t max, UErrorCode& status);
protected:
/**
* 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);
char validLocale[50];
char actualLocale[50];
public:
/**
* INTERNAL FOR 2.6 -- Registration.
*/
/**
* Return a StringEnumeration over the locales available at the time of the call,
* including registered locales.
* @return a StringEnumeration over the locales available at the time of the call
* @internal
*/
static StringEnumeration* getAvailableLocales(void);
/**
* Register a new Calendar factory. The factory will be adopted.
* INTERNAL in 2.6
* @param toAdopt the factory instance to be adopted
* @param status the in/out status code, no special meanings are assigned
* @return a registry key that can be used to unregister this factory
* @internal
*/
static URegistryKey registerFactory(ICUServiceFactory* toAdopt, UErrorCode& status);
/**
* Unregister a previously-registered CalendarFactory using the key returned from the
* register call. Key becomes invalid after a successful call and should not be used again.
* The CalendarFactory corresponding to the key will be deleted.
* INTERNAL in 2.6
* @param key the registry key returned by a previous call to registerFactory
* @param status the in/out status code, no special meanings are assigned
* @return TRUE if the factory for the key was successfully unregistered
* @internal
*/
static UBool unregister(URegistryKey key, UErrorCode& status);
/**
* Multiple Calendar Implementation
* @internal
*/
friend class CalendarFactory;
/**
* Multiple Calendar Implementation
* @internal
*/
friend class CalendarService;
/**
* Multiple Calendar Implementation
* @internal
*/
friend class DefaultCalendarFactory;
/**
* @internal
* @return TRUE if this calendar has a default century (i.e. 03 -> 2003)
*/
virtual UBool haveDefaultCentury() const = 0;
/**
* @internal
* @return the start of the default century, as a UDate
*/
virtual UDate defaultCenturyStart() const = 0;
/**
* @internal
* @return the beginning year of the default century, as a year
*/
virtual int32_t defaultCenturyStartYear() const = 0;
/** Get the locale for this calendar object. You can choose between valid and actual locale.
* @param type type of the locale we're looking for (valid or actual)
* @param status error code for the operation
* @return the locale
* @draft ICU 2.8
*/
virtual Locale getLocale(ULocDataLocaleType type, UErrorCode &status) const;
/** 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
*/
virtual const char* getLocaleInternal(ULocDataLocaleType type, UErrorCode &status) const;
};
// -------------------------------------
inline Calendar*
Calendar::createInstance(TimeZone* zone, UErrorCode& errorCode)
{
// since the Locale isn't specified, use the default locale
return createInstance(zone, Locale::getDefault(), errorCode);
}
// -------------------------------------
inline void
Calendar::roll(UCalendarDateFields field, UBool up, UErrorCode& status)
{
roll(field, (int32_t)(up ? +1 : -1), status);
}
inline void
Calendar::roll(EDateFields field, UBool up, UErrorCode& status)
{
roll((UCalendarDateFields) field, up, status);
}
// -------------------------------------
/**
* 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
}
inline void
Calendar::internalSet(EDateFields field, int32_t value)
{
internalSet((UCalendarDateFields) field, value);
}
inline uint8_t Calendar::julianDayToDayOfWeek(double julian)
{
// If julian is negative, then julian%7 will be negative, so we adjust
// accordingly. We add 1 because Julian day 0 is Monday.
int8_t dayOfWeek = (int8_t) uprv_fmod(julian + 1, 7);
uint8_t result = (uint8_t)(dayOfWeek + ((dayOfWeek < 0) ? (7+UCAL_SUNDAY ) : UCAL_SUNDAY));
return result;
}
inline int32_t Calendar::weekNumber(int32_t dayOfPeriod, int32_t dayOfWeek)
{
return weekNumber(dayOfPeriod, dayOfPeriod, dayOfWeek);
}
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_FORMATTING */
#endif // _CALENDAR
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