1 // © 2016 and later: Unicode, Inc. and others. 2 // License & terms of use: http://www.unicode.org/copyright.html 3 /* 4 ******************************************************************************* 5 * Copyright (C) 2009-2016, International Business Machines Corporation and 6 * others. All Rights Reserved. 7 ******************************************************************************* 8 */ 9 10 /** 11 * \file 12 * \brief C API: RFC2445 VTIMEZONE support 13 * 14 * <p>This is a C wrapper around the C++ VTimeZone class.</p> 15 */ 16 17 #ifndef __VZONE_H 18 #define __VZONE_H 19 20 #include "unicode/utypes.h" 21 22 #if !UCONFIG_NO_FORMATTING 23 24 #include "unicode/uobject.h" 25 #include "ztrans.h" 26 27 #ifndef UCNV_H 28 struct VZone; 29 /** 30 * A UnicodeSet. Use the vzone_* API to manipulate. Create with 31 * vzone_open*, and destroy with vzone_close. 32 */ 33 typedef struct VZone VZone; 34 #endif 35 36 /********************************************************************* 37 * VZone API 38 *********************************************************************/ 39 40 /** 41 * Creates a vzone from the given time zone ID. 42 * @param ID The time zone ID, such as America/New_York 43 * @param idLength, length of the ID parameter 44 * @return A vzone object initialized by the time zone ID, 45 * or NULL when the ID is unknown. 46 */ 47 U_CAPI VZone* U_EXPORT2 48 vzone_openID(const UChar* ID, int32_t idLength); 49 50 /** 51 * Create a vzone instance by RFC2445 VTIMEZONE data 52 * @param vtzdata The string including VTIMEZONE data block 53 * @param vtzdataLength, length of the vtzdata 54 * @param status Output param to filled in with a success or an error. 55 * @return A vzone initialized by the VTIMEZONE data or 56 * NULL if failed to load the rule from the VTIMEZONE data. 57 */ 58 U_CAPI VZone* U_EXPORT2 59 vzone_openData(const UChar* vtzdata, int32_t vtzdataLength, UErrorCode& status); 60 61 /** 62 * Disposes of the storage used by a VZone object. This function should 63 * be called exactly once for objects returned by vzone_open*. 64 * @param set the object to dispose of 65 */ 66 U_CAPI void U_EXPORT2 67 vzone_close(VZone* zone); 68 69 /** 70 * Returns a copy of this object. 71 * @param zone the original vzone 72 * @return the newly allocated copy of the vzone 73 */ 74 U_CAPI VZone* U_EXPORT2 75 vzone_clone(const VZone *zone); 76 77 /** 78 * Returns true if zone1 is identical to zone2 79 * and vis versa. 80 * @param zone1 to be checked for containment 81 * @param zone2 to be checked for containment 82 * @return true if the test condition is met 83 */ 84 U_CAPI UBool U_EXPORT2 85 vzone_equals(const VZone* zone1, const VZone* zone2); 86 87 /** 88 * Gets the RFC2445 TZURL property value. When a vzone instance was 89 * created from VTIMEZONE data, the initial value is set by the TZURL 90 * property value in the data. Otherwise, the initial value is not set. 91 * @param zone, the vzone to use 92 * @param url Receives the RFC2445 TZURL property value. 93 * @param urlLength, length of the url 94 * @return true if TZURL attribute is available and value is set. 95 */ 96 U_CAPI UBool U_EXPORT2 97 vzone_getTZURL(VZone* zone, UChar* & url, int32_t & urlLength); 98 99 /** 100 * Sets the RFC2445 TZURL property value. 101 * @param zone, the vzone to use 102 * @param url The TZURL property value. 103 * @param urlLength, length of the url 104 */ 105 U_CAPI void U_EXPORT2 106 vzone_setTZURL(VZone* zone, UChar* url, int32_t urlLength); 107 108 /** 109 * Gets the RFC2445 LAST-MODIFIED property value. When a vzone instance 110 * was created from VTIMEZONE data, the initial value is set by the 111 * LAST-MODIFIED property value in the data. Otherwise, the initial value 112 * is not set. 113 * @param zone, the vzone to use 114 * @param lastModified Receives the last modified date. 115 * @return true if lastModified attribute is available and value is set. 116 */ 117 U_CAPI UBool U_EXPORT2 118 vzone_getLastModified(VZone* zone, UDate& lastModified); 119 120 /** 121 * Sets the RFC2445 LAST-MODIFIED property value. 122 * @param zone, the vzone to use 123 * @param lastModified The LAST-MODIFIED date. 124 */ 125 U_CAPI void U_EXPORT2 126 vzone_setLastModified(VZone* zone, UDate lastModified); 127 128 /** 129 * Writes RFC2445 VTIMEZONE data for this time zone 130 * @param zone, the vzone to use 131 * @param result Output param to filled in with the VTIMEZONE data. 132 * @param resultLength, length of the result output 133 * @param status Output param to filled in with a success or an error. 134 */ 135 U_CAPI void U_EXPORT2 136 vzone_write(VZone* zone, UChar* & result, int32_t & resultLength, UErrorCode& status); 137 138 /** 139 * Writes RFC2445 VTIMEZONE data for this time zone applicable 140 * for dates after the specified start time. 141 * @param zone, the vzone to use 142 * @param start The start date. 143 * @param result Output param to filled in with the VTIMEZONE data. 144 * @param resultLength, length of the result output 145 * @param status Output param to filled in with a success or an error. 146 */ 147 U_CAPI void U_EXPORT2 148 vzone_writeFromStart(VZone* zone, UDate start, UChar* & result, int32_t & resultLength, UErrorCode& status); 149 150 /** 151 * Writes RFC2445 VTIMEZONE data applicable for the specified date. 152 * Some common iCalendar implementations can only handle a single time 153 * zone property or a pair of standard and daylight time properties using 154 * BYDAY rule with day of week (such as BYDAY=1SUN). This method produce 155 * the VTIMEZONE data which can be handled these implementations. The rules 156 * produced by this method can be used only for calculating time zone offset 157 * around the specified date. 158 * @param zone, the vzone to use 159 * @param time The date used for rule extraction. 160 * @param result Output param to filled in with the VTIMEZONE data. 161 * @param status Output param to filled in with a success or an error. 162 */ 163 U_CAPI void U_EXPORT2 164 vzone_writeSimple(VZone* zone, UDate time, UChar* & result, int32_t & resultLength, UErrorCode& status); 165 166 /** 167 * Returns the TimeZone's adjusted GMT offset (i.e., the number of milliseconds to add 168 * to GMT to get local time in this time zone, taking daylight savings time into 169 * account) as of a particular reference date. The reference date is used to determine 170 * whether daylight savings time is in effect and needs to be figured into the offset 171 * that is returned (in other words, what is the adjusted GMT offset in this time zone 172 * at this particular date and time?). For the time zones produced by createTimeZone(), 173 * the reference data is specified according to the Gregorian calendar, and the date 174 * and time fields are local standard time. 175 * 176 * <p>Note: Don't call this method. Instead, call the getOffset(UDate...) overload, 177 * which returns both the raw and the DST offset for a given time. This method 178 * is retained only for backward compatibility. 179 * 180 * @param zone, the vzone to use 181 * @param era The reference date's era 182 * @param year The reference date's year 183 * @param month The reference date's month (0-based; 0 is January) 184 * @param day The reference date's day-in-month (1-based) 185 * @param dayOfWeek The reference date's day-of-week (1-based; 1 is Sunday) 186 * @param millis The reference date's milliseconds in day, local standard time 187 * @param status Output param to filled in with a success or an error. 188 * @return The offset in milliseconds to add to GMT to get local time. 189 */ 190 U_CAPI int32_t U_EXPORT2 191 vzone_getOffset(VZone* zone, uint8_t era, int32_t year, int32_t month, int32_t day, 192 uint8_t dayOfWeek, int32_t millis, UErrorCode& status); 193 194 /** 195 * Gets the time zone offset, for current date, modified in case of 196 * daylight savings. This is the offset to add *to* UTC to get local 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 zone, the vzone to use 203 * @param era The reference date's era 204 * @param year The reference date's year 205 * @param month The reference date's month (0-based; 0 is January) 206 * @param day The reference date's day-in-month (1-based) 207 * @param dayOfWeek The reference date's day-of-week (1-based; 1 is Sunday) 208 * @param millis The reference date's milliseconds in day, local standard time 209 * @param monthLength The length of the given month in days. 210 * @param status Output param to filled in with a success or an error. 211 * @return The offset in milliseconds to add to GMT to get local time. 212 */ 213 U_CAPI int32_t U_EXPORT2 214 vzone_getOffset2(VZone* zone, uint8_t era, int32_t year, int32_t month, int32_t day, 215 uint8_t dayOfWeek, int32_t millis, 216 int32_t monthLength, UErrorCode& status); 217 218 /** 219 * Returns the time zone raw and GMT offset for the given moment 220 * in time. Upon return, local-millis = GMT-millis + rawOffset + 221 * dstOffset. All computations are performed in the proleptic 222 * Gregorian calendar. The default implementation in the TimeZone 223 * class delegates to the 8-argument getOffset(). 224 * 225 * @param zone, the vzone to use 226 * @param date moment in time for which to return offsets, in 227 * units of milliseconds from January 1, 1970 0:00 GMT, either GMT 228 * time or local wall time, depending on `local'. 229 * @param local if true, `date' is local wall time; otherwise it 230 * is in GMT time. 231 * @param rawOffset output parameter to receive the raw offset, that 232 * is, the offset not including DST adjustments 233 * @param dstOffset output parameter to receive the DST offset, 234 * that is, the offset to be added to `rawOffset' to obtain the 235 * total offset between local and GMT time. If DST is not in 236 * effect, this value is zero; otherwise it is a positive value, 237 * typically one hour. 238 * @param ec input-output error code 239 */ 240 U_CAPI void U_EXPORT2 241 vzone_getOffset3(VZone* zone, UDate date, UBool local, int32_t& rawOffset, 242 int32_t& dstOffset, UErrorCode& ec); 243 244 /** 245 * Sets the TimeZone's raw GMT offset (i.e., the number of milliseconds to add 246 * to GMT to get local time, before taking daylight savings time into account). 247 * 248 * @param zone, the vzone to use 249 * @param offsetMillis The new raw GMT offset for this time zone. 250 */ 251 U_CAPI void U_EXPORT2 252 vzone_setRawOffset(VZone* zone, int32_t offsetMillis); 253 254 /** 255 * Returns the TimeZone's raw GMT offset (i.e., the number of milliseconds to add 256 * to GMT to get local time, before taking daylight savings time into account). 257 * 258 * @param zone, the vzone to use 259 * @return The TimeZone's raw GMT offset. 260 */ 261 U_CAPI int32_t U_EXPORT2 262 vzone_getRawOffset(VZone* zone); 263 264 /** 265 * Queries if this time zone uses daylight savings time. 266 * @param zone, the vzone to use 267 * @return true if this time zone uses daylight savings time, 268 * false, otherwise. 269 */ 270 U_CAPI UBool U_EXPORT2 271 vzone_useDaylightTime(VZone* zone); 272 273 /** 274 * Queries if the given date is in daylight savings time in 275 * this time zone. 276 * This method is wasteful since it creates a new GregorianCalendar and 277 * deletes it each time it is called. This is a deprecated method 278 * and provided only for Java compatibility. 279 * 280 * @param zone, the vzone to use 281 * @param date the given UDate. 282 * @param status Output param filled in with success/error code. 283 * @return true if the given date is in daylight savings time, 284 * false, otherwise. 285 */ 286 U_CAPI UBool U_EXPORT2 287 vzone_inDaylightTime(VZone* zone, UDate date, UErrorCode& status); 288 289 /** 290 * Returns true if this zone has the same rule and offset as another zone. 291 * That is, if this zone differs only in ID, if at all. 292 * @param zone, the vzone to use 293 * @param other the <code>TimeZone</code> object to be compared with 294 * @return true if the given zone is the same as this one, 295 * with the possible exception of the ID 296 */ 297 U_CAPI UBool U_EXPORT2 298 vzone_hasSameRules(VZone* zone, const VZone* other); 299 300 /** 301 * Gets the first time zone transition after the base time. 302 * @param zone, the vzone to use 303 * @param base The base time. 304 * @param inclusive Whether the base time is inclusive or not. 305 * @param result Receives the first transition after the base time. 306 * @return true if the transition is found. 307 */ 308 U_CAPI UBool U_EXPORT2 309 vzone_getNextTransition(VZone* zone, UDate base, UBool inclusive, ZTrans* result); 310 311 /** 312 * Gets the most recent time zone transition before the base time. 313 * @param zone, the vzone to use 314 * @param base The base time. 315 * @param inclusive Whether the base time is inclusive or not. 316 * @param result Receives the most recent transition before the base time. 317 * @return true if the transition is found. 318 */ 319 U_CAPI UBool U_EXPORT2 320 vzone_getPreviousTransition(VZone* zone, UDate base, UBool inclusive, ZTrans* result); 321 322 /** 323 * Returns the number of <code>TimeZoneRule</code>s which represents time transitions, 324 * for this time zone, that is, all <code>TimeZoneRule</code>s for this time zone except 325 * <code>InitialTimeZoneRule</code>. The return value range is 0 or any positive value. 326 * @param zone, the vzone to use 327 * @param status Receives error status code. 328 * @return The number of <code>TimeZoneRule</code>s representing time transitions. 329 */ 330 U_CAPI int32_t U_EXPORT2 331 vzone_countTransitionRules(VZone* zone, UErrorCode& status); 332 333 /** 334 * Return the class ID for this class. This is useful only for comparing to 335 * a return value from getDynamicClassID(). For example: 336 * <pre> 337 * . Base* polymorphic_pointer = createPolymorphicObject(); 338 * . if (polymorphic_pointer->getDynamicClassID() == 339 * . erived::getStaticClassID()) ... 340 * </pre> 341 * @param zone, the vzone to use 342 * @return The class ID for all objects of this class. 343 */ 344 U_CAPI UClassID U_EXPORT2 345 vzone_getStaticClassID(VZone* zone); 346 347 /** 348 * Returns a unique class ID POLYMORPHICALLY. Pure virtual override. This 349 * method is to implement a simple version of RTTI, since not all C++ 350 * compilers support genuine RTTI. Polymorphic operator==() and clone() 351 * methods call this method. 352 * 353 * @param zone, the vzone to use 354 * @return The class ID for this object. All objects of a 355 * given class have the same class ID. Objects of 356 * other classes have different class IDs. 357 */ 358 U_CAPI UClassID U_EXPORT2 359 vzone_getDynamicClassID(VZone* zone); 360 361 #endif // __VZONE_H 362 363 #endif 364