VTimeZone is a class implementing RFC2445 VTIMEZONE. You can create a
* VTimeZone instance from a time zone ID supported by TimeZone.
* With the VTimeZone instance created from the ID, you can write out the rule
* in RFC2445 VTIMEZONE format. Also, you can create a VTimeZone instance
* from RFC2445 VTIMEZONE data stream, which allows you to calculate time
* zone offset by the rules defined by the data. Or, you can create a
* VTimeZone from any other ICU BasicTimeZone.
* VTimeZone object to be copied.
* @stable ICU 3.8
*/
VTimeZone(const VTimeZone& source);
/**
* Destructor.
* @stable ICU 3.8
*/
virtual ~VTimeZone();
/**
* Assignment operator.
* @param right The object to be copied.
* @stable ICU 3.8
*/
VTimeZone& operator=(const VTimeZone& right);
/**
* Return true if the given TimeZone objects are
* semantically equal. Objects of different subclasses are considered unequal.
* @param that The object to be compared with.
* @return true if the given TimeZone objects are
*semantically equal.
* @stable ICU 3.8
*/
virtual bool operator==(const TimeZone& that) const override;
/**
* Return true if the given TimeZone objects are
* semantically unequal. Objects of different subclasses are considered unequal.
* @param that The object to be compared with.
* @return true if the given TimeZone objects are
* semantically unequal.
* @stable ICU 3.8
*/
virtual bool operator!=(const TimeZone& that) const;
/**
* Create a VTimeZone instance by the time zone ID.
* @param ID The time zone ID, such as America/New_York
* @return A VTimeZone object initialized by the time zone ID,
* or nullptr when the ID is unknown.
* @stable ICU 3.8
*/
static VTimeZone* createVTimeZoneByID(const UnicodeString& ID);
/**
* Create a VTimeZone instance using a basic time zone.
* @param basicTZ The basic time zone instance
* @param status Output param to filled in with a success or an error.
* @return A VTimeZone object initialized by the basic time zone.
* @stable ICU 4.6
*/
static VTimeZone* createVTimeZoneFromBasicTimeZone(const BasicTimeZone& basicTZ,
UErrorCode &status);
/**
* Create a VTimeZone instance by RFC2445 VTIMEZONE data
*
* @param vtzdata The string including VTIMEZONE data block
* @param status Output param to filled in with a success or an error.
* @return A VTimeZone initialized by the VTIMEZONE data or
* nullptr if failed to load the rule from the VTIMEZONE data.
* @stable ICU 3.8
*/
static VTimeZone* createVTimeZone(const UnicodeString& vtzdata, UErrorCode& status);
/**
* Gets the RFC2445 TZURL property value. When a VTimeZone instance was
* created from VTIMEZONE data, the initial value is set by the TZURL property value
* in the data. Otherwise, the initial value is not set.
* @param url Receives the RFC2445 TZURL property value.
* @return true if TZURL attribute is available and value is set.
* @stable ICU 3.8
*/
UBool getTZURL(UnicodeString& url) const;
/**
* Sets the RFC2445 TZURL property value.
* @param url The TZURL property value.
* @stable ICU 3.8
*/
void setTZURL(const UnicodeString& url);
/**
* Gets the RFC2445 LAST-MODIFIED property value. When a VTimeZone instance
* was created from VTIMEZONE data, the initial value is set by the LAST-MODIFIED property
* value in the data. Otherwise, the initial value is not set.
* @param lastModified Receives the last modified date.
* @return true if lastModified attribute is available and value is set.
* @stable ICU 3.8
*/
UBool getLastModified(UDate& lastModified) const;
/**
* Sets the RFC2445 LAST-MODIFIED property value.
* @param lastModified The LAST-MODIFIED date.
* @stable ICU 3.8
*/
void setLastModified(UDate lastModified);
/**
* Writes RFC2445 VTIMEZONE data for this time zone
* @param result Output param to filled in with the VTIMEZONE data.
* @param status Output param to filled in with a success or an error.
* @stable ICU 3.8
*/
void write(UnicodeString& result, UErrorCode& status) const;
/**
* Writes RFC2445 VTIMEZONE data for this time zone applicable
* for dates after the specified start time.
* @param start The start date.
* @param result Output param to filled in with the VTIMEZONE data.
* @param status Output param to filled in with a success or an error.
* @stable ICU 3.8
*/
void write(UDate start, UnicodeString& result, UErrorCode& status) const;
/**
* Writes RFC2445 VTIMEZONE data applicable for the specified date.
* Some common iCalendar implementations can only handle a single time
* zone property or a pair of standard and daylight time properties using
* BYDAY rule with day of week (such as BYDAY=1SUN). This method produce
* the VTIMEZONE data which can be handled these implementations. The rules
* produced by this method can be used only for calculating time zone offset
* around the specified date.
* @param time The date used for rule extraction.
* @param result Output param to filled in with the VTIMEZONE data.
* @param status Output param to filled in with a success or an error.
* @stable ICU 3.8
*/
void writeSimple(UDate time, UnicodeString& result, UErrorCode& status) const;
/**
* Clones TimeZone objects polymorphically. Clients are responsible for deleting
* the TimeZone object cloned.
* @return A new copy of this TimeZone object.
* @stable ICU 3.8
*/
virtual VTimeZone* clone() const override;
/**
* Returns the TimeZone's adjusted GMT offset (i.e., the number of milliseconds to add
* to GMT to get local time in this time zone, taking daylight savings time into
* account) as of a particular reference date. The reference date is used to determine
* whether daylight savings time is in effect and needs to be figured into the offset
* that is returned (in other words, what is the adjusted GMT offset in this time zone
* at this particular date and time?). For the time zones produced by createTimeZone(),
* the reference data is specified according to the Gregorian calendar, and the date
* and time fields are local standard time.
*
* Note: Don't call this method. Instead, call the getOffset(UDate...) overload, * which returns both the raw and the DST offset for a given time. This method * is retained only for backward compatibility. * * @param era The reference date's era * @param year The reference date's year * @param month The reference date's month (0-based; 0 is January) * @param day The reference date's day-in-month (1-based) * @param dayOfWeek The reference date's day-of-week (1-based; 1 is Sunday) * @param millis The reference date's milliseconds in day, local standard time * @param status Output param to filled in with a success or an error. * @return The offset in milliseconds to add to GMT to get local time. * @stable ICU 3.8 */ virtual int32_t getOffset(uint8_t era, int32_t year, int32_t month, int32_t day, uint8_t dayOfWeek, int32_t millis, UErrorCode& status) const override; /** * Gets the time zone offset, for current date, modified in case of * daylight savings. This is the offset to add *to* UTC to get local time. * *
Note: Don't call this method. Instead, call the getOffset(UDate...) overload,
* which returns both the raw and the DST offset for a given time. This method
* is retained only for backward compatibility.
*
* @param era The reference date's era
* @param year The reference date's year
* @param month The reference date's month (0-based; 0 is January)
* @param day The reference date's day-in-month (1-based)
* @param dayOfWeek The reference date's day-of-week (1-based; 1 is Sunday)
* @param millis The reference date's milliseconds in day, local standard time
* @param monthLength The length of the given month in days.
* @param status Output param to filled in with a success or an error.
* @return The offset in milliseconds to add to GMT to get local time.
* @stable ICU 3.8
*/
virtual int32_t getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
uint8_t dayOfWeek, int32_t millis,
int32_t monthLength, UErrorCode& status) const override;
/**
* Returns the time zone raw and GMT offset for the given moment
* in time. Upon return, local-millis = GMT-millis + rawOffset +
* dstOffset. All computations are performed in the proleptic
* Gregorian calendar. The default implementation in the TimeZone
* class delegates to the 8-argument getOffset().
*
* @param date moment in time for which to return offsets, in
* units of milliseconds from January 1, 1970 0:00 GMT, either GMT
* time or local wall time, depending on `local'.
* @param local if true, `date' is local wall time; otherwise it
* is in GMT time.
* @param rawOffset output parameter to receive the raw offset, that
* is, the offset not including DST adjustments
* @param dstOffset output parameter to receive the DST offset,
* that is, the offset to be added to `rawOffset' to obtain the
* total offset between local and GMT time. If DST is not in
* effect, this value is zero; otherwise it is a positive value,
* typically one hour.
* @param ec input-output error code
* @stable ICU 3.8
*/
virtual void getOffset(UDate date, UBool local, int32_t& rawOffset,
int32_t& dstOffset, UErrorCode& ec) const override;
/**
* Get time zone offsets from local wall time.
* @stable ICU 69
*/
virtual void getOffsetFromLocal(
UDate date, UTimeZoneLocalOption nonExistingTimeOpt,
UTimeZoneLocalOption duplicatedTimeOpt,
int32_t& rawOffset, int32_t& dstOffset, UErrorCode& status) const override;
/**
* Sets the TimeZone's raw GMT offset (i.e., the number of milliseconds to add
* to GMT to get local time, before taking daylight savings time into account).
*
* @param offsetMillis The new raw GMT offset for this time zone.
* @stable ICU 3.8
*/
virtual void setRawOffset(int32_t offsetMillis) override;
/**
* Returns the TimeZone's raw GMT offset (i.e., the number of milliseconds to add
* to GMT to get local time, before taking daylight savings time into account).
*
* @return The TimeZone's raw GMT offset.
* @stable ICU 3.8
*/
virtual int32_t getRawOffset(void) const override;
/**
* Queries if this time zone uses daylight savings time.
* @return true if this time zone uses daylight savings time,
* false, otherwise.
* @stable ICU 3.8
*/
virtual UBool useDaylightTime(void) const override;
#ifndef U_FORCE_HIDE_DEPRECATED_API
/**
* Queries if the given date is in daylight savings time in
* this time zone.
* This method is wasteful since it creates a new GregorianCalendar and
* deletes it each time it is called. This is a deprecated method
* and provided only for Java compatibility.
*
* @param date the given UDate.
* @param status Output param filled in with success/error code.
* @return true if the given date is in daylight savings time,
* false, otherwise.
* @deprecated ICU 2.4. Use Calendar::inDaylightTime() instead.
*/
virtual UBool inDaylightTime(UDate date, UErrorCode& status) const override;
#endif // U_FORCE_HIDE_DEPRECATED_API
/**
* Returns true if this zone has the same rule and offset as another zone.
* That is, if this zone differs only in ID, if at all.
* @param other the TimeZone object to be compared with
* @return true if the given zone is the same as this one,
* with the possible exception of the ID
* @stable ICU 3.8
*/
virtual UBool hasSameRules(const TimeZone& other) const override;
/**
* Gets the first time zone transition after the base time.
* @param base The base time.
* @param inclusive Whether the base time is inclusive or not.
* @param result Receives the first transition after the base time.
* @return true if the transition is found.
* @stable ICU 3.8
*/
virtual UBool getNextTransition(UDate base, UBool inclusive, TimeZoneTransition& result) const override;
/**
* Gets the most recent time zone transition before the base time.
* @param base The base time.
* @param inclusive Whether the base time is inclusive or not.
* @param result Receives the most recent transition before the base time.
* @return true if the transition is found.
* @stable ICU 3.8
*/
virtual UBool getPreviousTransition(UDate base, UBool inclusive, TimeZoneTransition& result) const override;
/**
* Returns the number of TimeZoneRules which represents time transitions,
* for this time zone, that is, all TimeZoneRules for this time zone except
* InitialTimeZoneRule. The return value range is 0 or any positive value.
* @param status Receives error status code.
* @return The number of TimeZoneRules representing time transitions.
* @stable ICU 3.8
*/
virtual int32_t countTransitionRules(UErrorCode& status) const override;
/**
* Gets the InitialTimeZoneRule and the set of TimeZoneRule
* which represent time transitions for this time zone. On successful return,
* the argument initial points to non-nullptr InitialTimeZoneRule and
* the array trsrules is filled with 0 or multiple TimeZoneRule
* instances up to the size specified by trscount. The results are referencing the
* rule instance held by this time zone instance. Therefore, after this time zone
* is destructed, they are no longer available.
* @param initial Receives the initial timezone rule
* @param trsrules Receives the timezone transition rules
* @param trscount On input, specify the size of the array 'transitions' receiving
* the timezone transition rules. On output, actual number of
* rules filled in the array will be set.
* @param status Receives error status code.
* @stable ICU 3.8
*/
virtual void getTimeZoneRules(const InitialTimeZoneRule*& initial,
const TimeZoneRule* trsrules[], int32_t& trscount, UErrorCode& status) const override;
private:
enum { DEFAULT_VTIMEZONE_LINES = 100 };
/**
* Default constructor.
*/
VTimeZone();
void write(VTZWriter& writer, UErrorCode& status) const;
void write(UDate start, VTZWriter& writer, UErrorCode& status) const;
void writeSimple(UDate time, VTZWriter& writer, UErrorCode& status) const;
void load(VTZReader& reader, UErrorCode& status);
void parse(UErrorCode& status);
void writeZone(VTZWriter& w, BasicTimeZone& basictz, UVector* customProps,
UErrorCode& status) const;
void writeHeaders(VTZWriter& w, UErrorCode& status) const;
void writeFooter(VTZWriter& writer, UErrorCode& status) const;
void writeZonePropsByTime(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
int32_t fromOffset, int32_t toOffset, UDate time, UBool withRDATE,
UErrorCode& status) const;
void writeZonePropsByDOM(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
int32_t fromOffset, int32_t toOffset,
int32_t month, int32_t dayOfMonth, UDate startTime, UDate untilTime,
UErrorCode& status) const;
void writeZonePropsByDOW(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
int32_t fromOffset, int32_t toOffset,
int32_t month, int32_t weekInMonth, int32_t dayOfWeek,
UDate startTime, UDate untilTime, UErrorCode& status) const;
void writeZonePropsByDOW_GEQ_DOM(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
int32_t fromOffset, int32_t toOffset,
int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
UDate startTime, UDate untilTime, UErrorCode& status) const;
void writeZonePropsByDOW_GEQ_DOM_sub(VTZWriter& writer, int32_t month, int32_t dayOfMonth,
int32_t dayOfWeek, int32_t numDays,
UDate untilTime, int32_t fromOffset, UErrorCode& status) const;
void writeZonePropsByDOW_LEQ_DOM(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
int32_t fromOffset, int32_t toOffset,
int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
UDate startTime, UDate untilTime, UErrorCode& status) const;
void writeFinalRule(VTZWriter& writer, UBool isDst, const AnnualTimeZoneRule* rule,
int32_t fromRawOffset, int32_t fromDSTSavings,
UDate startTime, UErrorCode& status) const;
void beginZoneProps(VTZWriter& writer, UBool isDst, const UnicodeString& zonename,
int32_t fromOffset, int32_t toOffset, UDate startTime, UErrorCode& status) const;
void endZoneProps(VTZWriter& writer, UBool isDst, UErrorCode& status) const;
void beginRRULE(VTZWriter& writer, int32_t month, UErrorCode& status) const;
void appendUNTIL(VTZWriter& writer, const UnicodeString& until, UErrorCode& status) const;
BasicTimeZone *tz;
UVector *vtzlines;
UnicodeString tzurl;
UDate lastmod;
UnicodeString olsonzid;
UnicodeString icutzver;
public:
/**
* Return the class ID for this class. This is useful only for comparing to
* a return value from getDynamicClassID(). For example:
*
* . Base* polymorphic_pointer = createPolymorphicObject();
* . if (polymorphic_pointer->getDynamicClassID() ==
* . erived::getStaticClassID()) ...
*
* @return The class ID for all objects of this class.
* @stable ICU 3.8
*/
static UClassID U_EXPORT2 getStaticClassID(void);
/**
* Returns a unique class ID POLYMORPHICALLY. Pure virtual override. 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.
*
* @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 3.8
*/
virtual UClassID getDynamicClassID(void) const override;
};
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_FORMATTING */
#endif /* U_SHOW_CPLUSPLUS_API */
#endif // VTZONE_H
//eof