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comparison: intl/icu/source/i18n/unicode/vtzone.h

intl/icu/source/i18n/unicode/vtzone.h

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1 /*
2 *******************************************************************************
3 * Copyright (C) 2007-2013, 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 * @stable 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

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