1 /* 2 ******************************************************************************* 3 * Copyright (C) 2007-2010, International Business Machines Corporation and * 4 * others. All Rights Reserved. * 5 ******************************************************************************* 6 */ 7 #ifndef VTZONE_H 8 #define VTZONE_H 9 10 #include "unicode/utypes.h" 11 12 /** 13 * \file 14 * \brief C++ API: RFC2445 VTIMEZONE support 15 */ 16 17 #if !UCONFIG_NO_FORMATTING 18 19 #include "unicode/basictz.h" 20 21 U_NAMESPACE_BEGIN 22 23 class VTZWriter; 24 class VTZReader; 25 class UVector; 26 27 /** 28 * <code>VTimeZone</code> is a class implementing RFC2445 VTIMEZONE. You can create a 29 * <code>VTimeZone</code> instance from a time zone ID supported by <code>TimeZone</code>. 30 * With the <code>VTimeZone</code> instance created from the ID, you can write out the rule 31 * in RFC2445 VTIMEZONE format. Also, you can create a <code>VTimeZone</code> instance 32 * from RFC2445 VTIMEZONE data stream, which allows you to calculate time 33 * zone offset by the rules defined by the data. Or, you can create a 34 * <code>VTimeZone</code> from any other ICU <code>BasicTimeZone</code>. 35 * <br><br> 36 * Note: The consumer of this class reading or writing VTIMEZONE data is responsible to 37 * decode or encode Non-ASCII text. Methods reading/writing VTIMEZONE data in this class 38 * do nothing with MIME encoding. 39 * @stable ICU 3.8 40 */ 41 class U_I18N_API VTimeZone : public BasicTimeZone { 42 public: 43 /** 44 * Copy constructor. 45 * @param source The <code>VTimeZone</code> object to be copied. 46 * @stable ICU 3.8 47 */ 48 VTimeZone(const VTimeZone& source); 49 50 /** 51 * Destructor. 52 * @stable ICU 3.8 53 */ 54 virtual ~VTimeZone(); 55 56 /** 57 * Assignment operator. 58 * @param right The object to be copied. 59 * @stable ICU 3.8 60 */ 61 VTimeZone& operator=(const VTimeZone& right); 62 63 /** 64 * Return true if the given <code>TimeZone</code> objects are 65 * semantically equal. Objects of different subclasses are considered unequal. 66 * @param that The object to be compared with. 67 * @return true if the given <code>TimeZone</code> objects are 68 *semantically equal. 69 * @stable ICU 3.8 70 */ 71 virtual UBool operator==(const TimeZone& that) const; 72 73 /** 74 * Return true if the given <code>TimeZone</code> objects are 75 * semantically unequal. Objects of different subclasses are considered unequal. 76 * @param that The object to be compared with. 77 * @return true if the given <code>TimeZone</code> objects are 78 * semantically unequal. 79 * @stable ICU 3.8 80 */ 81 virtual UBool operator!=(const TimeZone& that) const; 82 83 /** 84 * Create a <code>VTimeZone</code> instance by the time zone ID. 85 * @param ID The time zone ID, such as America/New_York 86 * @return A <code>VTimeZone</code> object initialized by the time zone ID, 87 * or NULL when the ID is unknown. 88 * @stable ICU 3.8 89 */ 90 static VTimeZone* createVTimeZoneByID(const UnicodeString& ID); 91 92 /** 93 * Create a <code>VTimeZone</code> instance using a basic time zone. 94 * @param basicTZ The basic time zone instance 95 * @param status Output param to filled in with a success or an error. 96 * @return A <code>VTimeZone</code> object initialized by the basic time zone. 97 * @draft ICU 4.6 98 */ 99 static VTimeZone* createVTimeZoneFromBasicTimeZone(const BasicTimeZone& basicTZ, 100 UErrorCode &status); 101 102 /** 103 * Create a <code>VTimeZone</code> instance by RFC2445 VTIMEZONE data 104 * 105 * @param vtzdata The string including VTIMEZONE data block 106 * @param status Output param to filled in with a success or an error. 107 * @return A <code>VTimeZone</code> initialized by the VTIMEZONE data or 108 * NULL if failed to load the rule from the VTIMEZONE data. 109 * @stable ICU 3.8 110 */ 111 static VTimeZone* createVTimeZone(const UnicodeString& vtzdata, UErrorCode& status); 112 113 /** 114 * Gets the RFC2445 TZURL property value. When a <code>VTimeZone</code> instance was 115 * created from VTIMEZONE data, the initial value is set by the TZURL property value 116 * in the data. Otherwise, the initial value is not set. 117 * @param url Receives the RFC2445 TZURL property value. 118 * @return TRUE if TZURL attribute is available and value is set. 119 * @stable ICU 3.8 120 */ 121 UBool getTZURL(UnicodeString& url) const; 122 123 /** 124 * Sets the RFC2445 TZURL property value. 125 * @param url The TZURL property value. 126 * @stable ICU 3.8 127 */ 128 void setTZURL(const UnicodeString& url); 129 130 /** 131 * Gets the RFC2445 LAST-MODIFIED property value. When a <code>VTimeZone</code> instance 132 * was created from VTIMEZONE data, the initial value is set by the LAST-MODIFIED property 133 * value in the data. Otherwise, the initial value is not set. 134 * @param lastModified Receives the last modified date. 135 * @return TRUE if lastModified attribute is available and value is set. 136 * @stable ICU 3.8 137 */ 138 UBool getLastModified(UDate& lastModified) const; 139 140 /** 141 * Sets the RFC2445 LAST-MODIFIED property value. 142 * @param lastModified The LAST-MODIFIED date. 143 * @stable ICU 3.8 144 */ 145 void setLastModified(UDate lastModified); 146 147 /** 148 * Writes RFC2445 VTIMEZONE data for this time zone 149 * @param result Output param to filled in with the VTIMEZONE data. 150 * @param status Output param to filled in with a success or an error. 151 * @stable ICU 3.8 152 */ 153 void write(UnicodeString& result, UErrorCode& status) const; 154 155 /** 156 * Writes RFC2445 VTIMEZONE data for this time zone applicalbe 157 * for dates after the specified start time. 158 * @param start The start date. 159 * @param result Output param to filled in with the VTIMEZONE data. 160 * @param status Output param to filled in with a success or an error. 161 * @stable ICU 3.8 162 */ 163 void write(UDate start, UnicodeString& result, UErrorCode& status) /*const*/; 164 165 /** 166 * Writes RFC2445 VTIMEZONE data applicalbe for the specified date. 167 * Some common iCalendar implementations can only handle a single time 168 * zone property or a pair of standard and daylight time properties using 169 * BYDAY rule with day of week (such as BYDAY=1SUN). This method produce 170 * the VTIMEZONE data which can be handled these implementations. The rules 171 * produced by this method can be used only for calculating time zone offset 172 * around the specified date. 173 * @param time The date used for rule extraction. 174 * @param result Output param to filled in with the VTIMEZONE data. 175 * @param status Output param to filled in with a success or an error. 176 * @stable ICU 3.8 177 */ 178 void writeSimple(UDate time, UnicodeString& result, UErrorCode& status) /*const*/; 179 180 /** 181 * Clones TimeZone objects polymorphically. Clients are responsible for deleting 182 * the TimeZone object cloned. 183 * @return A new copy of this TimeZone object. 184 * @stable ICU 3.8 185 */ 186 virtual TimeZone* clone(void) const; 187 188 /** 189 * Returns the TimeZone's adjusted GMT offset (i.e., the number of milliseconds to add 190 * to GMT to get local time in this time zone, taking daylight savings time into 191 * account) as of a particular reference date. The reference date is used to determine 192 * whether daylight savings time is in effect and needs to be figured into the offset 193 * that is returned (in other words, what is the adjusted GMT offset in this time zone 194 * at this particular date and time?). For the time zones produced by createTimeZone(), 195 * the reference data is specified according to the Gregorian calendar, and the date 196 * and time fields are local standard time. 197 * 198 * <p>Note: Don't call this method. Instead, call the getOffset(UDate...) overload, 199 * which returns both the raw and the DST offset for a given time. This method 200 * is retained only for backward compatibility. 201 * 202 * @param era The reference date's era 203 * @param year The reference date's year 204 * @param month The reference date's month (0-based; 0 is January) 205 * @param day The reference date's day-in-month (1-based) 206 * @param dayOfWeek The reference date's day-of-week (1-based; 1 is Sunday) 207 * @param millis The reference date's milliseconds in day, local standard time 208 * @param status Output param to filled in with a success or an error. 209 * @return The offset in milliseconds to add to GMT to get local time. 210 * @stable ICU 3.8 211 */ 212 virtual int32_t getOffset(uint8_t era, int32_t year, int32_t month, int32_t day, 213 uint8_t dayOfWeek, int32_t millis, UErrorCode& status) const; 214 215 /** 216 * Gets the time zone offset, for current date, modified in case of 217 * daylight savings. This is the offset to add *to* UTC to get local time. 218 * 219 * <p>Note: Don't call this method. Instead, call the getOffset(UDate...) overload, 220 * which returns both the raw and the DST offset for a given time. This method 221 * is retained only for backward compatibility. 222 * 223 * @param era The reference date's era 224 * @param year The reference date's year 225 * @param month The reference date's month (0-based; 0 is January) 226 * @param day The reference date's day-in-month (1-based) 227 * @param dayOfWeek The reference date's day-of-week (1-based; 1 is Sunday) 228 * @param millis The reference date's milliseconds in day, local standard time 229 * @param monthLength The length of the given month in days. 230 * @param status Output param to filled in with a success or an error. 231 * @return The offset in milliseconds to add to GMT to get local time. 232 * @stable ICU 3.8 233 */ 234 virtual int32_t getOffset(uint8_t era, int32_t year, int32_t month, int32_t day, 235 uint8_t dayOfWeek, int32_t millis, 236 int32_t monthLength, UErrorCode& status) const; 237 238 /** 239 * Returns the time zone raw and GMT offset for the given moment 240 * in time. Upon return, local-millis = GMT-millis + rawOffset + 241 * dstOffset. All computations are performed in the proleptic 242 * Gregorian calendar. The default implementation in the TimeZone 243 * class delegates to the 8-argument getOffset(). 244 * 245 * @param date moment in time for which to return offsets, in 246 * units of milliseconds from January 1, 1970 0:00 GMT, either GMT 247 * time or local wall time, depending on `local'. 248 * @param local if true, `date' is local wall time; otherwise it 249 * is in GMT time. 250 * @param rawOffset output parameter to receive the raw offset, that 251 * is, the offset not including DST adjustments 252 * @param dstOffset output parameter to receive the DST offset, 253 * that is, the offset to be added to `rawOffset' to obtain the 254 * total offset between local and GMT time. If DST is not in 255 * effect, this value is zero; otherwise it is a positive value, 256 * typically one hour. 257 * @param ec input-output error code 258 * @stable ICU 3.8 259 */ 260 virtual void getOffset(UDate date, UBool local, int32_t& rawOffset, 261 int32_t& dstOffset, UErrorCode& ec) const; 262 263 /** 264 * Sets the TimeZone's raw GMT offset (i.e., the number of milliseconds to add 265 * to GMT to get local time, before taking daylight savings time into account). 266 * 267 * @param offsetMillis The new raw GMT offset for this time zone. 268 * @stable ICU 3.8 269 */ 270 virtual void setRawOffset(int32_t offsetMillis); 271 272 /** 273 * Returns the TimeZone's raw GMT offset (i.e., the number of milliseconds to add 274 * to GMT to get local time, before taking daylight savings time into account). 275 * 276 * @return The TimeZone's raw GMT offset. 277 * @stable ICU 3.8 278 */ 279 virtual int32_t getRawOffset(void) const; 280 281 /** 282 * Queries if this time zone uses daylight savings time. 283 * @return true if this time zone uses daylight savings time, 284 * false, otherwise. 285 * @stable ICU 3.8 286 */ 287 virtual UBool useDaylightTime(void) const; 288 289 /** 290 * Queries if the given date is in daylight savings time in 291 * this time zone. 292 * This method is wasteful since it creates a new GregorianCalendar and 293 * deletes it each time it is called. This is a deprecated method 294 * and provided only for Java compatibility. 295 * 296 * @param date the given UDate. 297 * @param status Output param filled in with success/error code. 298 * @return true if the given date is in daylight savings time, 299 * false, otherwise. 300 * @deprecated ICU 2.4. Use Calendar::inDaylightTime() instead. 301 */ 302 virtual UBool inDaylightTime(UDate date, UErrorCode& status) const; 303 304 /** 305 * Returns true if this zone has the same rule and offset as another zone. 306 * That is, if this zone differs only in ID, if at all. 307 * @param other the <code>TimeZone</code> object to be compared with 308 * @return true if the given zone is the same as this one, 309 * with the possible exception of the ID 310 * @stable ICU 3.8 311 */ 312 virtual UBool hasSameRules(const TimeZone& other) const; 313 314 /** 315 * Gets the first time zone transition after the base time. 316 * @param base The base time. 317 * @param inclusive Whether the base time is inclusive or not. 318 * @param result Receives the first transition after the base time. 319 * @return TRUE if the transition is found. 320 * @stable ICU 3.8 321 */ 322 virtual UBool getNextTransition(UDate base, UBool inclusive, TimeZoneTransition& result) /*const*/; 323 324 /** 325 * Gets the most recent time zone transition before the base time. 326 * @param base The base time. 327 * @param inclusive Whether the base time is inclusive or not. 328 * @param result Receives the most recent transition before the base time. 329 * @return TRUE if the transition is found. 330 * @stable ICU 3.8 331 */ 332 virtual UBool getPreviousTransition(UDate base, UBool inclusive, TimeZoneTransition& result) /*const*/; 333 334 /** 335 * Returns the number of <code>TimeZoneRule</code>s which represents time transitions, 336 * for this time zone, that is, all <code>TimeZoneRule</code>s for this time zone except 337 * <code>InitialTimeZoneRule</code>. The return value range is 0 or any positive value. 338 * @param status Receives error status code. 339 * @return The number of <code>TimeZoneRule</code>s representing time transitions. 340 * @stable ICU 3.8 341 */ 342 virtual int32_t countTransitionRules(UErrorCode& status) /*const*/; 343 344 /** 345 * Gets the <code>InitialTimeZoneRule</code> and the set of <code>TimeZoneRule</code> 346 * which represent time transitions for this time zone. On successful return, 347 * the argument initial points to non-NULL <code>InitialTimeZoneRule</code> and 348 * the array trsrules is filled with 0 or multiple <code>TimeZoneRule</code> 349 * instances up to the size specified by trscount. The results are referencing the 350 * rule instance held by this time zone instance. Therefore, after this time zone 351 * is destructed, they are no longer available. 352 * @param initial Receives the initial timezone rule 353 * @param trsrules Receives the timezone transition rules 354 * @param trscount On input, specify the size of the array 'transitions' receiving 355 * the timezone transition rules. On output, actual number of 356 * rules filled in the array will be set. 357 * @param status Receives error status code. 358 * @stable ICU 3.8 359 */ 360 virtual void getTimeZoneRules(const InitialTimeZoneRule*& initial, 361 const TimeZoneRule* trsrules[], int32_t& trscount, UErrorCode& status) /*const*/; 362 363 private: 364 enum { DEFAULT_VTIMEZONE_LINES = 100 }; 365 366 /** 367 * Default constructor. 368 */ 369 VTimeZone(); 370 static VTimeZone* createVTimeZone(VTZReader* reader); 371 void write(VTZWriter& writer, UErrorCode& status) const; 372 void write(UDate start, VTZWriter& writer, UErrorCode& status) /*const*/; 373 void writeSimple(UDate time, VTZWriter& writer, UErrorCode& status) /*const*/; 374 void load(VTZReader& reader, UErrorCode& status); 375 void parse(UErrorCode& status); 376 377 void writeZone(VTZWriter& w, BasicTimeZone& basictz, UVector* customProps, 378 UErrorCode& status) const; 379 380 void writeHeaders(VTZWriter& w, UErrorCode& status) const; 381 void writeFooter(VTZWriter& writer, UErrorCode& status) const; 382 383 void writeZonePropsByTime(VTZWriter& writer, UBool isDst, const UnicodeString& zonename, 384 int32_t fromOffset, int32_t toOffset, UDate time, UBool withRDATE, 385 UErrorCode& status) const; 386 void writeZonePropsByDOM(VTZWriter& writer, UBool isDst, const UnicodeString& zonename, 387 int32_t fromOffset, int32_t toOffset, 388 int32_t month, int32_t dayOfMonth, UDate startTime, UDate untilTime, 389 UErrorCode& status) const; 390 void writeZonePropsByDOW(VTZWriter& writer, UBool isDst, const UnicodeString& zonename, 391 int32_t fromOffset, int32_t toOffset, 392 int32_t month, int32_t weekInMonth, int32_t dayOfWeek, 393 UDate startTime, UDate untilTime, UErrorCode& status) const; 394 void writeZonePropsByDOW_GEQ_DOM(VTZWriter& writer, UBool isDst, const UnicodeString& zonename, 395 int32_t fromOffset, int32_t toOffset, 396 int32_t month, int32_t dayOfMonth, int32_t dayOfWeek, 397 UDate startTime, UDate untilTime, UErrorCode& status) const; 398 void writeZonePropsByDOW_GEQ_DOM_sub(VTZWriter& writer, int32_t month, int32_t dayOfMonth, 399 int32_t dayOfWeek, int32_t numDays, 400 UDate untilTime, int32_t fromOffset, UErrorCode& status) const; 401 void writeZonePropsByDOW_LEQ_DOM(VTZWriter& writer, UBool isDst, const UnicodeString& zonename, 402 int32_t fromOffset, int32_t toOffset, 403 int32_t month, int32_t dayOfMonth, int32_t dayOfWeek, 404 UDate startTime, UDate untilTime, UErrorCode& status) const; 405 void writeFinalRule(VTZWriter& writer, UBool isDst, const AnnualTimeZoneRule* rule, 406 int32_t fromRawOffset, int32_t fromDSTSavings, 407 UDate startTime, UErrorCode& status) const; 408 409 void beginZoneProps(VTZWriter& writer, UBool isDst, const UnicodeString& zonename, 410 int32_t fromOffset, int32_t toOffset, UDate startTime, UErrorCode& status) const; 411 void endZoneProps(VTZWriter& writer, UBool isDst, UErrorCode& status) const; 412 void beginRRULE(VTZWriter& writer, int32_t month, UErrorCode& status) const; 413 void appendUNTIL(VTZWriter& writer, const UnicodeString& until, UErrorCode& status) const; 414 415 BasicTimeZone *tz; 416 UVector *vtzlines; 417 UnicodeString tzurl; 418 UDate lastmod; 419 UnicodeString olsonzid; 420 UnicodeString icutzver; 421 422 public: 423 /** 424 * Return the class ID for this class. This is useful only for comparing to 425 * a return value from getDynamicClassID(). For example: 426 * <pre> 427 * . Base* polymorphic_pointer = createPolymorphicObject(); 428 * . if (polymorphic_pointer->getDynamicClassID() == 429 * . erived::getStaticClassID()) ... 430 * </pre> 431 * @return The class ID for all objects of this class. 432 * @stable ICU 3.8 433 */ 434 static UClassID U_EXPORT2 getStaticClassID(void); 435 436 /** 437 * Returns a unique class ID POLYMORPHICALLY. Pure virtual override. This 438 * method is to implement a simple version of RTTI, since not all C++ 439 * compilers support genuine RTTI. Polymorphic operator==() and clone() 440 * methods call this method. 441 * 442 * @return The class ID for this object. All objects of a 443 * given class have the same class ID. Objects of 444 * other classes have different class IDs. 445 * @stable ICU 3.8 446 */ 447 virtual UClassID getDynamicClassID(void) const; 448 }; 449 450 U_NAMESPACE_END 451 452 #endif /* #if !UCONFIG_NO_FORMATTING */ 453 454 #endif // VTZONE_H 455 //eof 456
