1 /* 2 ******************************************************************************* 3 * Copyright (C) 2009-2011, International Business Machines Corporation and 4 * others. All Rights Reserved. 5 ******************************************************************************* 6 */ 7 8 /** 9 * \file 10 * \brief C API: RFC2445 VTIMEZONE support 11 * 12 * <p>This is a C wrapper around the C++ VTimeZone class.</p> 13 */ 14 15 #ifndef __VZONE_H 16 #define __VZONE_H 17 18 #include "unicode/utypes.h" 19 20 #if !UCONFIG_NO_FORMATTING 21 22 #include "ztrans.h" 23 24 #ifndef UCNV_H 25 struct VZone; 26 /** 27 * A UnicodeSet. Use the vzone_* API to manipulate. Create with 28 * vzone_open*, and destroy with vzone_close. 29 */ 30 typedef struct VZone VZone; 31 #endif 32 33 /********************************************************************* 34 * VZone API 35 *********************************************************************/ 36 37 /** 38 * Creates a vzone from the given time zone ID. 39 * @param ID The time zone ID, such as America/New_York 40 * @param idLength, length of the ID parameter 41 * @return A vzone object initialized by the time zone ID, 42 * or NULL when the ID is unknown. 43 */ 44 U_CAPI VZone* U_EXPORT2 45 vzone_openID(const UChar* ID, int32_t idLength); 46 47 /** 48 * Create a vzone instance by RFC2445 VTIMEZONE data 49 * @param vtzdata The string including VTIMEZONE data block 50 * @param vtzdataLength, length of the vtzdata 51 * @param status Output param to filled in with a success or an error. 52 * @return A vzone initialized by the VTIMEZONE data or 53 * NULL if failed to load the rule from the VTIMEZONE data. 54 */ 55 U_CAPI VZone* U_EXPORT2 56 vzone_openData(const UChar* vtzdata, int32_t vtzdataLength, UErrorCode& status); 57 58 /** 59 * Disposes of the storage used by a VZone object. This function should 60 * be called exactly once for objects returned by vzone_open*. 61 * @param set the object to dispose of 62 */ 63 U_CAPI void U_EXPORT2 64 vzone_close(VZone* zone); 65 66 /** 67 * Returns a copy of this object. 68 * @param zone the original vzone 69 * @return the newly allocated copy of the vzone 70 */ 71 U_CAPI VZone* U_EXPORT2 72 vzone_clone(const VZone *zone); 73 74 /** 75 * Returns true if zone1 is identical to zone2 76 * and vis versa. 77 * @param zone1 to be checked for containment 78 * @param zone2 to be checked for containment 79 * @return true if the test condition is met 80 */ 81 U_CAPI UBool U_EXPORT2 82 vzone_equals(const VZone* zone1, const VZone* zone2); 83 84 /** 85 * Gets the RFC2445 TZURL property value. When a vzone instance was 86 * created from VTIMEZONE data, the initial value is set by the TZURL 87 * property value in the data. Otherwise, the initial value is not set. 88 * @param zone, the vzone to use 89 * @param url Receives the RFC2445 TZURL property value. 90 * @param urlLength, length of the url 91 * @return TRUE if TZURL attribute is available and value is set. 92 */ 93 U_CAPI UBool U_EXPORT2 94 vzone_getTZURL(VZone* zone, UChar* & url, int32_t & urlLength); 95 96 /** 97 * Sets the RFC2445 TZURL property value. 98 * @param zone, the vzone to use 99 * @param url The TZURL property value. 100 * @param urlLength, length of the url 101 */ 102 U_CAPI void U_EXPORT2 103 vzone_setTZURL(VZone* zone, UChar* url, int32_t urlLength); 104 105 /** 106 * Gets the RFC2445 LAST-MODIFIED property value. When a vzone instance 107 * was created from VTIMEZONE data, the initial value is set by the 108 * LAST-MODIFIED property value in the data. Otherwise, the initial value 109 * is not set. 110 * @param zone, the vzone to use 111 * @param lastModified Receives the last modified date. 112 * @return TRUE if lastModified attribute is available and value is set. 113 */ 114 U_CAPI UBool U_EXPORT2 115 vzone_getLastModified(VZone* zone, UDate& lastModified); 116 117 /** 118 * Sets the RFC2445 LAST-MODIFIED property value. 119 * @param zone, the vzone to use 120 * @param lastModified The LAST-MODIFIED date. 121 */ 122 U_CAPI void U_EXPORT2 123 vzone_setLastModified(VZone* zone, UDate lastModified); 124 125 /** 126 * Writes RFC2445 VTIMEZONE data for this time zone 127 * @param zone, the vzone to use 128 * @param result Output param to filled in with the VTIMEZONE data. 129 * @param resultLength, length of the result output 130 * @param status Output param to filled in with a success or an error. 131 */ 132 U_CAPI void U_EXPORT2 133 vzone_write(VZone* zone, UChar* & result, int32_t & resultLength, UErrorCode& status); 134 135 /** 136 * Writes RFC2445 VTIMEZONE data for this time zone applicalbe 137 * for dates after the specified start time. 138 * @param zone, the vzone to use 139 * @param start The start date. 140 * @param result Output param to filled in with the VTIMEZONE data. 141 * @param resultLength, length of the result output 142 * @param status Output param to filled in with a success or an error. 143 */ 144 U_CAPI void U_EXPORT2 145 vzone_writeFromStart(VZone* zone, UDate start, UChar* & result, int32_t & resultLength, UErrorCode& status); 146 147 /** 148 * Writes RFC2445 VTIMEZONE data applicalbe for the specified date. 149 * Some common iCalendar implementations can only handle a single time 150 * zone property or a pair of standard and daylight time properties using 151 * BYDAY rule with day of week (such as BYDAY=1SUN). This method produce 152 * the VTIMEZONE data which can be handled these implementations. The rules 153 * produced by this method can be used only for calculating time zone offset 154 * around the specified date. 155 * @param zone, the vzone to use 156 * @param time The date used for rule extraction. 157 * @param result Output param to filled in with the VTIMEZONE data. 158 * @param status Output param to filled in with a success or an error. 159 */ 160 U_CAPI void U_EXPORT2 161 vzone_writeSimple(VZone* zone, UDate time, UChar* & result, int32_t & resultLength, UErrorCode& status); 162 163 /** 164 * Returns the TimeZone's adjusted GMT offset (i.e., the number of milliseconds to add 165 * to GMT to get local time in this time zone, taking daylight savings time into 166 * account) as of a particular reference date. The reference date is used to determine 167 * whether daylight savings time is in effect and needs to be figured into the offset 168 * that is returned (in other words, what is the adjusted GMT offset in this time zone 169 * at this particular date and time?). For the time zones produced by createTimeZone(), 170 * the reference data is specified according to the Gregorian calendar, and the date 171 * and time fields are local standard time. 172 * 173 * <p>Note: Don't call this method. Instead, call the getOffset(UDate...) overload, 174 * which returns both the raw and the DST offset for a given time. This method 175 * is retained only for backward compatibility. 176 * 177 * @param zone, the vzone to use 178 * @param era The reference date's era 179 * @param year The reference date's year 180 * @param month The reference date's month (0-based; 0 is January) 181 * @param day The reference date's day-in-month (1-based) 182 * @param dayOfWeek The reference date's day-of-week (1-based; 1 is Sunday) 183 * @param millis The reference date's milliseconds in day, local standard time 184 * @param status Output param to filled in with a success or an error. 185 * @return The offset in milliseconds to add to GMT to get local time. 186 */ 187 U_CAPI int32_t U_EXPORT2 188 vzone_getOffset(VZone* zone, uint8_t era, int32_t year, int32_t month, int32_t day, 189 uint8_t dayOfWeek, int32_t millis, UErrorCode& status); 190 191 /** 192 * Gets the time zone offset, for current date, modified in case of 193 * daylight savings. This is the offset to add *to* UTC to get local time. 194 * 195 * <p>Note: Don't call this method. Instead, call the getOffset(UDate...) overload, 196 * which returns both the raw and the DST offset for a given time. This method 197 * is retained only for backward compatibility. 198 * 199 * @param zone, the vzone to use 200 * @param era The reference date's era 201 * @param year The reference date's year 202 * @param month The reference date's month (0-based; 0 is January) 203 * @param day The reference date's day-in-month (1-based) 204 * @param dayOfWeek The reference date's day-of-week (1-based; 1 is Sunday) 205 * @param millis The reference date's milliseconds in day, local standard time 206 * @param monthLength The length of the given month in days. 207 * @param status Output param to filled in with a success or an error. 208 * @return The offset in milliseconds to add to GMT to get local time. 209 */ 210 U_CAPI int32_t U_EXPORT2 211 vzone_getOffset2(VZone* zone, uint8_t era, int32_t year, int32_t month, int32_t day, 212 uint8_t dayOfWeek, int32_t millis, 213 int32_t monthLength, UErrorCode& status); 214 215 /** 216 * Returns the time zone raw and GMT offset for the given moment 217 * in time. Upon return, local-millis = GMT-millis + rawOffset + 218 * dstOffset. All computations are performed in the proleptic 219 * Gregorian calendar. The default implementation in the TimeZone 220 * class delegates to the 8-argument getOffset(). 221 * 222 * @param zone, the vzone to use 223 * @param date moment in time for which to return offsets, in 224 * units of milliseconds from January 1, 1970 0:00 GMT, either GMT 225 * time or local wall time, depending on `local'. 226 * @param local if true, `date' is local wall time; otherwise it 227 * is in GMT time. 228 * @param rawOffset output parameter to receive the raw offset, that 229 * is, the offset not including DST adjustments 230 * @param dstOffset output parameter to receive the DST offset, 231 * that is, the offset to be added to `rawOffset' to obtain the 232 * total offset between local and GMT time. If DST is not in 233 * effect, this value is zero; otherwise it is a positive value, 234 * typically one hour. 235 * @param ec input-output error code 236 */ 237 U_CAPI void U_EXPORT2 238 vzone_getOffset3(VZone* zone, UDate date, UBool local, int32_t& rawOffset, 239 int32_t& dstOffset, UErrorCode& ec); 240 241 /** 242 * Sets the TimeZone's raw GMT offset (i.e., the number of milliseconds to add 243 * to GMT to get local time, before taking daylight savings time into account). 244 * 245 * @param zone, the vzone to use 246 * @param offsetMillis The new raw GMT offset for this time zone. 247 */ 248 U_CAPI void U_EXPORT2 249 vzone_setRawOffset(VZone* zone, int32_t offsetMillis); 250 251 /** 252 * Returns the TimeZone's raw GMT offset (i.e., the number of milliseconds to add 253 * to GMT to get local time, before taking daylight savings time into account). 254 * 255 * @param zone, the vzone to use 256 * @return The TimeZone's raw GMT offset. 257 */ 258 U_CAPI int32_t U_EXPORT2 259 vzone_getRawOffset(VZone* zone); 260 261 /** 262 * Queries if this time zone uses daylight savings time. 263 * @param zone, the vzone to use 264 * @return true if this time zone uses daylight savings time, 265 * false, otherwise. 266 */ 267 U_CAPI UBool U_EXPORT2 268 vzone_useDaylightTime(VZone* zone); 269 270 /** 271 * Queries if the given date is in daylight savings time in 272 * this time zone. 273 * This method is wasteful since it creates a new GregorianCalendar and 274 * deletes it each time it is called. This is a deprecated method 275 * and provided only for Java compatibility. 276 * 277 * @param zone, the vzone to use 278 * @param date the given UDate. 279 * @param status Output param filled in with success/error code. 280 * @return true if the given date is in daylight savings time, 281 * false, otherwise. 282 */ 283 U_INTERNAL UBool U_EXPORT2 284 vzone_inDaylightTime(VZone* zone, UDate date, UErrorCode& status); 285 286 /** 287 * Returns true if this zone has the same rule and offset as another zone. 288 * That is, if this zone differs only in ID, if at all. 289 * @param zone, the vzone to use 290 * @param other the <code>TimeZone</code> object to be compared with 291 * @return true if the given zone is the same as this one, 292 * with the possible exception of the ID 293 */ 294 U_CAPI UBool U_EXPORT2 295 vzone_hasSameRules(VZone* zone, const VZone* other); 296 297 /** 298 * Gets the first time zone transition after the base time. 299 * @param zone, the vzone to use 300 * @param base The base time. 301 * @param inclusive Whether the base time is inclusive or not. 302 * @param result Receives the first transition after the base time. 303 * @return TRUE if the transition is found. 304 */ 305 U_CAPI UBool U_EXPORT2 306 vzone_getNextTransition(VZone* zone, UDate base, UBool inclusive, ZTrans* result); 307 308 /** 309 * Gets the most recent time zone transition before the base time. 310 * @param zone, the vzone to use 311 * @param base The base time. 312 * @param inclusive Whether the base time is inclusive or not. 313 * @param result Receives the most recent transition before the base time. 314 * @return TRUE if the transition is found. 315 */ 316 U_CAPI UBool U_EXPORT2 317 vzone_getPreviousTransition(VZone* zone, UDate base, UBool inclusive, ZTrans* result); 318 319 /** 320 * Returns the number of <code>TimeZoneRule</code>s which represents time transitions, 321 * for this time zone, that is, all <code>TimeZoneRule</code>s for this time zone except 322 * <code>InitialTimeZoneRule</code>. The return value range is 0 or any positive value. 323 * @param zone, the vzone to use 324 * @param status Receives error status code. 325 * @return The number of <code>TimeZoneRule</code>s representing time transitions. 326 */ 327 U_CAPI int32_t U_EXPORT2 328 vzone_countTransitionRules(VZone* zone, UErrorCode& status); 329 330 /** 331 * Return the class ID for this class. This is useful only for comparing to 332 * a return value from getDynamicClassID(). For example: 333 * <pre> 334 * . Base* polymorphic_pointer = createPolymorphicObject(); 335 * . if (polymorphic_pointer->getDynamicClassID() == 336 * . erived::getStaticClassID()) ... 337 * </pre> 338 * @param zone, the vzone to use 339 * @return The class ID for all objects of this class. 340 */ 341 U_CAPI UClassID U_EXPORT2 342 vzone_getStaticClassID(VZone* zone); 343 344 /** 345 * Returns a unique class ID POLYMORPHICALLY. Pure virtual override. This 346 * method is to implement a simple version of RTTI, since not all C++ 347 * compilers support genuine RTTI. Polymorphic operator==() and clone() 348 * methods call this method. 349 * 350 * @param zone, the vzone to use 351 * @return The class ID for this object. All objects of a 352 * given class have the same class ID. Objects of 353 * other classes have different class IDs. 354 */ 355 U_CAPI UClassID U_EXPORT2 356 vzone_getDynamicClassID(VZone* zone); 357 358 #endif // __VZONE_H 359 360 #endif 361