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Edit File: vtzone.h

// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ******************************************************************************* * Copyright (C) 2007-2013, International Business Machines Corporation and * others. All Rights Reserved. ******************************************************************************* */ #ifndef VTZONE_H #define VTZONE_H #include "unicode/utypes.h" #if U_SHOW_CPLUSPLUS_API /** * \file * \brief C++ API: RFC2445 VTIMEZONE support */ #if !UCONFIG_NO_FORMATTING #include "unicode/basictz.h" U_NAMESPACE_BEGIN class VTZWriter; class VTZReader; class UVector; /** * <code>VTimeZone</code> is a class implementing RFC2445 VTIMEZONE. You can create a * <code>VTimeZone</code> instance from a time zone ID supported by <code>TimeZone</code>. * With the <code>VTimeZone</code> instance created from the ID, you can write out the rule * in RFC2445 VTIMEZONE format. Also, you can create a <code>VTimeZone</code> 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 * <code>VTimeZone</code> from any other ICU <code>BasicTimeZone</code>. * <br><br> * Note: The consumer of this class reading or writing VTIMEZONE data is responsible to * decode or encode Non-ASCII text. Methods reading/writing VTIMEZONE data in this class * do nothing with MIME encoding. * @stable ICU 3.8 */ class U_I18N_API VTimeZone : public BasicTimeZone { public: /** * Copy constructor. * @param source The <code>VTimeZone</code> 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 <code>TimeZone</code> objects are * semantically equal. Objects of different subclasses are considered unequal. * @param that The object to be compared with. * @return true if the given <code>TimeZone</code> objects are *semantically equal. * @stable ICU 3.8 */ virtual bool operator==(const TimeZone& that) const override; /** * Return true if the given <code>TimeZone</code> objects are * semantically unequal. Objects of different subclasses are considered unequal. * @param that The object to be compared with. * @return true if the given <code>TimeZone</code> objects are * semantically unequal. * @stable ICU 3.8 */ virtual bool operator!=(const TimeZone& that) const; /** * Create a <code>VTimeZone</code> instance by the time zone ID. * @param ID The time zone ID, such as America/New_York * @return A <code>VTimeZone</code> object initialized by the time zone ID, * or NULL when the ID is unknown. * @stable ICU 3.8 */ static VTimeZone* createVTimeZoneByID(const UnicodeString& ID); /** * Create a <code>VTimeZone</code> 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 <code>VTimeZone</code> object initialized by the basic time zone. * @stable ICU 4.6 */ static VTimeZone* createVTimeZoneFromBasicTimeZone(const BasicTimeZone& basicTZ, UErrorCode &status); /** * Create a <code>VTimeZone</code> 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 <code>VTimeZone</code> initialized by the VTIMEZONE data or * NULL 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 <code>VTimeZone</code> 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 <code>VTimeZone</code> 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. * * <p>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. * * <p>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 <code>TimeZone</code> 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 <code>TimeZoneRule</code>s which represents time transitions, * for this time zone, that is, all <code>TimeZoneRule</code>s for this time zone except * <code>InitialTimeZoneRule</code>. The return value range is 0 or any positive value. * @param status Receives error status code. * @return The number of <code>TimeZoneRule</code>s representing time transitions. * @stable ICU 3.8 */ virtual int32_t countTransitionRules(UErrorCode& status) const override; /** * Gets the <code>InitialTimeZoneRule</code> and the set of <code>TimeZoneRule</code> * which represent time transitions for this time zone. On successful return, * the argument initial points to non-NULL <code>InitialTimeZoneRule</code> and * the array trsrules is filled with 0 or multiple <code>TimeZoneRule</code> * 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: * <pre> * . Base* polymorphic_pointer = createPolymorphicObject(); * . if (polymorphic_pointer->getDynamicClassID() == * . erived::getStaticClassID()) ... * </pre> * @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