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gecko-dev/modules/libnls/headers/calendar.h
tague f3731166a5 added libnls headers to public build
1998-05-27 02:02:27 +00:00

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/*
********************************************************************************
* *
* COPYRIGHT: *
* (C) Copyright Taligent, Inc., 1997 *
* (C) Copyright International Business Machines Corporation, 1997 *
* Licensed Material - Program-Property of IBM - All Rights Reserved. *
* US Government Users Restricted Rights - Use, duplication, or disclosure *
* restricted by GSA ADP Schedule Contract with IBM Corp. *
* *
********************************************************************************
*
* 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.
********************************************************************************
*/
#ifndef _CALENDAR
#define _CALENDAR
#include "timezone.h"
#include "locid.h"
/**
* Calendar is an abstract base class for converting between a Date and a set of integer
* fields such as YEAR, MONTH, DATE, HOUR and so on. A Date is a signed numeric value
* representing the number of milliseconds since midnight, January 1, 1970, GMT.
* <P>
* Calendar contains two kinds of time representations: current "time" in milliseconds
* (an instance of Date), and a set of time "fields" representing the current time.
* Calling setTime() method only sets the current time without recomputing the time fields
* until the next get() method is called. Similarly, calling one of the set() methods only
* sets time fields without recomputing the current time value until the next getTime()
* method is called.
* <P>
* Subclasses of Calendar interpret a Date according to the rules of a specific calendar
* system. The main subclass of Calendar is GregorianCalendar. Future subclasses could
* represent the various types of lunar calendars in use in many parts of the world.
* (Subclasses of Calendar aren't free to change the meaning of Date, however; a particular
* Date value should represent the same instant in time for all calendars, no matter what
* they call it. For example, a Date value of 0 is midnight, January 1, 1970 according
* to the Gregorian calendar, but midnight, the 23rd of Tevet, 5730, according to the
* Hebrew calendar and midnight, the 23rd of Shawwal, 1389, according to the Islamic
* calendar. All of these are different names for the same instant in time.)
* <P>
* A Calendar object can produce all the time field values needed to implement the
* date/time formatting for a particular language and calendar style (e.g.
* Japanese-Gregorian, Japanese-Traditional).
* <P>
* When computing a Date from time fields, two special circumstances may arise: there
* might be insufficient information to compute the Date (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>
* Inconsistent information. The calendar will give preference to the combinations of
* fields in the following order (and disregard other inconsistent information).
* <pre>
* . month + day-of-month
* . month + week-of-month + day-of-week
* . month + day-of-week-of-month + day-of-week
* . day-of-year
* . day-of-week + week-of-year
* . hour-of-day
* . ampm + hour-of-ampm
* </pre>
* Note: for some non-Gregorian calendars, different fields may be necessary for
* complete disambiguation. For example, a full specification of the historial Arabic
* astronomical calendar requires year, month, day-of-month AND day-of-week in some
* cases.
* <P>
* Note: There are certain possible ambiguities in interpretation of certain singular
* times, which are resolved in the following ways:
* <P>
* a. 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
* <P>
* b. 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
* <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.
* <P>
* 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 September
* 12, 1996 results in October 12, 1996. After rolling a field, other fields may change
* to maintain a legal date value. This change will be done so as to minimize the time
* adjustment. For example, rolling the month up on January 31, 1996 results in February
* 29, 1996.
* <P>
* 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".
* <P>
* Providers who subclass Calendar should override both computeFields() and computeTime(),
* not getTime() and setTime().
*/
#ifdef NLS_MAC
#pragma export on
#endif
class T_FORMAT_API Calendar {
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.
*/
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*kMillisPerHour..12*kMillisPerHour
DST_OFFSET, // Example: 0 or kMillisPerHour
FIELD_COUNT,
DAY_OF_MONTH = DATE // Synonyms
};
/**
* 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.
*/
enum EDaysOfWeek {
SUNDAY = 1,
MONDAY,
TUESDAY,
WEDNESDAY,
THURSDAY,
FRIDAY,
SATURDAY
};
/**
* Useful constants for month. Note: Calendar month is 0-based.
*/
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.
*/
enum EAmpm {
AM,
PM
};
/**
* destructor
*/
virtual ~Calendar();
/**
* Create and return a polymorphic copy of this calendar.
*/
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 ZERO_ERROR if created successfully, set to a failure result
* otherwise.
* @return A Calendar if created successfully. NULL otherwise.
*/
static Calendar* createInstance(ErrorCode& success);
/**
* Creates a Calendar using the given timezone and the default locale. If creation of
* a new Calendar is successful, the Calendar takes ownership of zoneToAdopt; the
* client should not delete it.
*
* @param zoneToAdopt The given timezone to be adopted.
* @param success Indicates the success/failure of Calendar creation. Filled in
* with ZERO_ERROR if created successfully, set to a failure result
* otherwise.
* @return A Calendar if created successfully. NULL otherwise.
*/
static Calendar* createInstance(TimeZone* zoneToAdopt, ErrorCode& 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 ZERO_ERROR if created successfully, set to a failure result
* otherwise.
* @return A Calendar if created successfully. NULL otherwise.
*/
static Calendar* createInstance(const TimeZone& zone, ErrorCode& 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 ZERO_ERROR if created successfully, set to a failure result
* otherwise.
* @return A Calendar if created successfully. NULL otherwise.
*/
static Calendar* createInstance(const Locale& aLocale, ErrorCode& success);
/**
* Creates a Calendar using the given timezone and given locale. If creation of
* a new Calendar is successful, the Calendar takes ownership of zoneToAdopt; the
* client should 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 ZERO_ERROR if created successfully, set to a failure result
* otherwise.
* @return A Calendar if created successfully. NULL otherwise.
*/
static Calendar* createInstance(TimeZone* zoneToAdopt, const Locale& aLocale, ErrorCode& 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 timezone.
* @param aLocale The given locale.
* @param success Indicates the success/failure of Calendar creation. Filled in
* with ZERO_ERROR if created successfully, set to a failure result
* otherwise.
* @return A Calendar if created successfully. NULL otherwise.
*/
static Calendar* createInstance(const TimeZone& zoneToAdopt, const Locale& aLocale, ErrorCode& 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.
*/
static const Locale* getAvailableLocales(t_int32& count);
/**
* Returns the current system time in milliseconds since 0:00:00 GMT 1/1/70.
*
* @return The current system time in milliseconds.
*/
static Date getNow();
/**
* 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 UCT
* (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 UCT (GMT) time, or zero if the operation
* failed.
*/
Date getTime(ErrorCode& status) const;
/**
* Sets this Calendar's current time with the given Date. The time specified should
* be in non-local UCT (GMT) time.
*
* @param date The given Date in UCT (GMT) time.
*/
void setTime(Date date, ErrorCode& 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.
*/
virtual t_bool 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.
*/
t_bool operator!=(const Calendar& that) const {return !operator==(that);}
/**
* 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.
*/
t_bool equals(const Calendar& when, ErrorCode& 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.
*/
t_bool before(const Calendar& when, ErrorCode& 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.
*/
t_bool after(const Calendar& when, ErrorCode& status) const;
/**
* Return true if another Calendar object is equivalent to this one. An equivalent
* Calendar will behave exactly as this one does, but may be set to a different time.
*/
virtual t_bool equivalentTo(const Calendar& other) const;
/**
* Date 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.
*/
virtual void add(EDateFields field, t_int32 amount, ErrorCode& status) = 0;
/**
* 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, ErrorCode&) 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.
*/
void roll(EDateFields field, t_bool up, ErrorCode& 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.
*/
virtual void roll(EDateFields field, int amount, ErrorCode& status) = 0;
/**
* 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.
*/
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 value The given time zone.
*/
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.
*/
const TimeZone& getTimeZone() 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.
*/
TimeZone* orphanTimeZone();
/**
* 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.
*/
virtual t_bool inDaylightTime(ErrorCode& 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
*/
void setLenient(t_bool lenient);
/**
* Tells whether date/time interpretation is to be lenient.
*
* @return True tells that date/time interpretation is to be lenient.
*/
t_bool isLenient() 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.
*/
void setFirstDayOfWeek(EDaysOfWeek 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.
*/
EDaysOfWeek getFirstDayOfWeek() 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.
*/
void setMinimalDaysInFirstWeek(t_uint8 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.
*/
t_uint8 getMinimalDaysInFirstWeek() 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.
*/
virtual t_int32 getMinimum(EDateFields field) const = 0;
/**
* 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.
*/
virtual t_int32 getMaximum(EDateFields field) const = 0;
/**
* 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.
*/
virtual t_int32 getGreatestMinimum(EDateFields field) const = 0;
/**
* 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.
*/
virtual t_int32 getLeastMaximum(EDateFields field) const = 0;
/**
* 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.
*/
t_int32 get(EDateFields field, ErrorCode& 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.
*
* @return True if the given time field has a value set; false otherwise.
*/
t_bool isSet(EDateFields 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.
*/
void set(EDateFields field, t_int32 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.
*/
void set(t_int32 year, t_int32 month, t_int32 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.
*/
void set(t_int32 year, t_int32 month, t_int32 date, t_int32 hour, t_int32 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.
*/
void set(t_int32 year, t_int32 month, t_int32 date, t_int32 hour, t_int32 minute, t_int32 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.
*/
void clear();
/**
* 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.
*/
void clear(EDateFields 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 ClassID getStaticClassID() { return (ClassID)&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.
*/
virtual ClassID getDynamicClassID() 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
* ZERO_ERROR if constructed successfully.
*/
Calendar(ErrorCode& success);
/**
* Copy constructor
*/
Calendar(const Calendar& source);
/**
* Default assignment operator
*/
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 zoneToAdopt The given time zone.
* @param aLocale The given locale.
* @param success Indicates the status of Calendar object construction. Returns
* ZERO_ERROR if constructed successfully.
*/
Calendar(TimeZone* zone, const Locale& aLocale, ErrorCode& 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
* ZERO_ERROR if constructed successfully.
*/
Calendar(const TimeZone& zone, const Locale& aLocale, ErrorCode& 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.
*/
virtual void computeTime(ErrorCode& status) = 0;
/**
* 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().
*/
virtual void computeFields(ErrorCode& status) = 0;
/**
* 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.
*/
void complete(ErrorCode& 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.
*/
t_int32 internalGet(EDateFields 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.
*/
void internalSet(EDateFields field, t_int32 value);
protected:
/**
* The flag which indicates if the current time is set in the calendar.
*/
t_bool 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.
*/
t_bool fAreFieldsSet;
/**
* True if all of the fields have been set. This is initially false, and set to
* true by computeFields().
*/
t_bool fAreAllFieldsSet;
/**
* Get the current time without recomputing.
*/
Date internalGetTime() const { return fTime; }
/**
* Set the current time without affecting flags or fields.
*/
void internalSetTime(Date time) { fTime = time; }
/**
* The time fields containing values into which the millis is computed.
*/
t_int32 fFields[FIELD_COUNT];
/**
* The flags which tell if a specified time field for the calendar is set.
*/
t_bool fIsSet[FIELD_COUNT];
/**
* True if the ZONE_OFFSET field was set by the user. Meaningless if fIsSet[ZONE_OFFSET]
* is false.
*/
t_bool fUserSetZoneOffset;
/**
* True if the DST_OFFSET field was set by the user. Meaningless if fIsSet[ZONE_OFFSET]
* is false.
*/
t_bool fUserSetDSTOffset;
private:
/**
* The current time set for the calendar.
*/
Date fTime;
/**
* @see #setLenient
*/
t_bool 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.
*/
EDaysOfWeek fFirstDayOfWeek;
t_uint8 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 ZERO_ERROR if
* constructed successfully.
*/
void setWeekCountData(const Locale& desiredLocale, ErrorCode& success);
/**
* Convert a UnicodeString to a long integer, using the standard C library. Return
* both the value obtained, and a ErrorCode indicating success or failure. We fail
* if the string is zero length, of if strtol() does not parse all of the characters
* in the string, or if the value is not in the range 1..7.
*/
static int stringToDayNumber(const UnicodeString& string, ErrorCode& status);
/**
* The resource tag for the resource where the week-count data is stored.
*/
static const char* kDateTimeElements;
};
#ifdef NLS_MAC
#pragma export off
#endif
// -------------------------------------
inline void
Calendar::roll(EDateFields field, t_bool up, ErrorCode& status)
{
roll(field, (up ? +1 : -1), status);
}
// -------------------------------------
/**
* Fast method for subclasses. The caller must maintain fUserSetDSTOffset and
* fUserSetZoneOffset, as well as the isSet[] array.
*/
inline void
Calendar::internalSet(EDateFields field, t_int32 value)
{
fFields[field] = value;
}
#endif // _CALENDAR
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