1 // Copyright (C) 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
4 *******************************************************************************
5 * Copyright (C) 2011-2016, International Business Machines Corporation and
6 * others. All Rights Reserved.
7 *******************************************************************************
14 * \brief C++ API: TimeZoneNames
16 #include "unicode/utypes.h"
18 #if !UCONFIG_NO_FORMATTING
20 #include "unicode/uloc.h"
21 #include "unicode/unistr.h"
26 * Constants for time zone display name types.
29 typedef enum UTimeZoneNameType {
31 * Unknown display name type.
36 * Long display name, such as "Eastern Time".
39 UTZNM_LONG_GENERIC = 0x01,
41 * Long display name for standard time, such as "Eastern Standard Time".
44 UTZNM_LONG_STANDARD = 0x02,
46 * Long display name for daylight saving time, such as "Eastern Daylight Time".
49 UTZNM_LONG_DAYLIGHT = 0x04,
51 * Short display name, such as "ET".
54 UTZNM_SHORT_GENERIC = 0x08,
56 * Short display name for standard time, such as "EST".
59 UTZNM_SHORT_STANDARD = 0x10,
61 * Short display name for daylight saving time, such as "EDT".
64 UTZNM_SHORT_DAYLIGHT = 0x20,
66 * Exemplar location name, such as "Los Angeles".
69 UTZNM_EXEMPLAR_LOCATION = 0x40
80 * <code>TimeZoneNames</code> is an abstract class representing the time zone display name data model defined
81 * by <a href="http://www.unicode.org/reports/tr35/">UTS#35 Unicode Locale Data Markup Language (LDML)</a>.
82 * The model defines meta zone, which is used for storing a set of display names. A meta zone can be shared
83 * by multiple time zones. Also a time zone may have multiple meta zone historic mappings.
85 * For example, people in the United States refer the zone used by the east part of North America as "Eastern Time".
86 * The tz database contains multiple time zones "America/New_York", "America/Detroit", "America/Montreal" and some
87 * others that belong to "Eastern Time". However, assigning different display names to these time zones does not make
88 * much sense for most of people.
90 * In <a href="http://cldr.unicode.org/">CLDR</a> (which uses LDML for representing locale data), the display name
91 * "Eastern Time" is stored as long generic display name of a meta zone identified by the ID "America_Eastern".
92 * Then, there is another table maintaining the historic mapping to meta zones for each time zone. The time zones in
93 * the above example ("America/New_York", "America/Detroit"...) are mapped to the meta zone "America_Eastern".
95 * Sometimes, a time zone is mapped to a different time zone in the past. For example, "America/Indiana/Knox"
96 * had been moving "Eastern Time" and "Central Time" back and forth. Therefore, it is necessary that time zone
97 * to meta zones mapping data are stored by date range.
100 * The methods in this class assume that time zone IDs are already canonicalized. For example, you may not get proper
101 * result returned by a method with time zone ID "America/Indiana/Indianapolis", because it's not a canonical time zone
102 * ID (the canonical time zone ID for the time zone is "America/Indianapolis". See
103 * {@link TimeZone#getCanonicalID(const UnicodeString& id, UnicodeString& canonicalID, UErrorCode& status)} about ICU
104 * canonical time zone IDs.
107 * In CLDR, most of time zone display names except location names are provided through meta zones. But a time zone may
108 * have a specific name that is not shared with other time zones.
110 * For example, time zone "Europe/London" has English long name for standard time "Greenwich Mean Time", which is also
111 * shared with other time zones. However, the long name for daylight saving time is "British Summer Time", which is only
112 * used for "Europe/London".
115 * {@link #getTimeZoneDisplayName} is designed for accessing a name only used by a single time zone.
116 * But is not necessarily mean that a subclass implementation use the same model with CLDR. A subclass implementation
117 * may provide time zone names only through {@link #getTimeZoneDisplayName}, or only through {@link #getMetaZoneDisplayName},
121 * The default <code>TimeZoneNames</code> implementation returned by {@link #createInstance}
122 * uses the locale data imported from CLDR. In CLDR, set of meta zone IDs and mappings between zone IDs and meta zone
123 * IDs are shared by all locales. Therefore, the behavior of {@link #getAvailableMetaZoneIDs},
124 * {@link #getMetaZoneID}, and {@link #getReferenceZoneID} won't be changed no matter
125 * what locale is used for getting an instance of <code>TimeZoneNames</code>.
129 class U_I18N_API TimeZoneNames : public UObject {
135 virtual ~TimeZoneNames();
138 * Return true if the given TimeZoneNames objects are semantically equal.
139 * @param other the object to be compared with.
140 * @return Return TRUE if the given Format objects are semantically equal.
143 virtual UBool operator==(const TimeZoneNames& other) const = 0;
146 * Return true if the given TimeZoneNames objects are not semantically
148 * @param other the object to be compared with.
149 * @return Return TRUE if the given Format objects are not semantically equal.
152 UBool operator!=(const TimeZoneNames& other) const { return !operator==(other); }
155 * Clone this object polymorphically. The caller is responsible
156 * for deleting the result when done.
157 * @return A copy of the object
160 virtual TimeZoneNames* clone() const = 0;
163 * Returns an instance of <code>TimeZoneNames</code> for the specified locale.
165 * @param locale The locale.
166 * @param status Receives the status.
167 * @return An instance of <code>TimeZoneNames</code>
170 static TimeZoneNames* U_EXPORT2 createInstance(const Locale& locale, UErrorCode& status);
173 * Returns an instance of <code>TimeZoneNames</code> containing only short specific
174 * zone names (SHORT_STANDARD and SHORT_DAYLIGHT),
175 * compatible with the IANA tz database's zone abbreviations (not localized).
177 * Note: The input locale is used for resolving ambiguous names (e.g. "IST" is parsed
178 * as Israel Standard Time for Israel, while it is parsed as India Standard Time for
179 * all other regions). The zone names returned by this instance are not localized.
182 static TimeZoneNames* U_EXPORT2 createTZDBInstance(const Locale& locale, UErrorCode& status);
185 * Returns an enumeration of all available meta zone IDs.
186 * @param status Receives the status.
187 * @return an enumeration object, owned by the caller.
190 virtual StringEnumeration* getAvailableMetaZoneIDs(UErrorCode& status) const = 0;
193 * Returns an enumeration of all available meta zone IDs used by the given time zone.
194 * @param tzID The canoical tiem zone ID.
195 * @param status Receives the status.
196 * @return an enumeration object, owned by the caller.
199 virtual StringEnumeration* getAvailableMetaZoneIDs(const UnicodeString& tzID, UErrorCode& status) const = 0;
202 * Returns the meta zone ID for the given canonical time zone ID at the given date.
203 * @param tzID The canonical time zone ID.
204 * @param date The date.
205 * @param mzID Receives the meta zone ID for the given time zone ID at the given date. If the time zone does not have a
206 * corresponding meta zone at the given date or the implementation does not support meta zones, "bogus" state
208 * @return A reference to the result.
211 virtual UnicodeString& getMetaZoneID(const UnicodeString& tzID, UDate date, UnicodeString& mzID) const = 0;
214 * Returns the reference zone ID for the given meta zone ID for the region.
216 * Note: Each meta zone must have a reference zone associated with a special region "001" (world).
217 * Some meta zones may have region specific reference zone IDs other than the special region
218 * "001". When a meta zone does not have any region specific reference zone IDs, this method
219 * return the reference zone ID for the special region "001" (world).
221 * @param mzID The meta zone ID.
222 * @param region The region.
223 * @param tzID Receives the reference zone ID ("golden zone" in the LDML specification) for the given time zone ID for the
224 * region. If the meta zone is unknown or the implementation does not support meta zones, "bogus" state
226 * @return A reference to the result.
229 virtual UnicodeString& getReferenceZoneID(const UnicodeString& mzID, const char* region, UnicodeString& tzID) const = 0;
232 * Returns the display name of the meta zone.
233 * @param mzID The meta zone ID.
234 * @param type The display name type. See {@link #UTimeZoneNameType}.
235 * @param name Receives the display name of the meta zone. When this object does not have a localized display name for the given
236 * meta zone with the specified type or the implementation does not provide any display names associated
237 * with meta zones, "bogus" state is set.
238 * @return A reference to the result.
241 virtual UnicodeString& getMetaZoneDisplayName(const UnicodeString& mzID, UTimeZoneNameType type, UnicodeString& name) const = 0;
244 * Returns the display name of the time zone. Unlike {@link #getDisplayName},
245 * this method does not get a name from a meta zone used by the time zone.
246 * @param tzID The canonical time zone ID.
247 * @param type The display name type. See {@link #UTimeZoneNameType}.
248 * @param name Receives the display name for the time zone. When this object does not have a localized display name for the given
249 * time zone with the specified type, "bogus" state is set.
250 * @return A reference to the result.
253 virtual UnicodeString& getTimeZoneDisplayName(const UnicodeString& tzID, UTimeZoneNameType type, UnicodeString& name) const = 0;
256 * Returns the exemplar location name for the given time zone. When this object does not have a localized location
257 * name, the default implementation may still returns a programmatically generated name with the logic described
260 * <li>Check if the ID contains "/". If not, return null.
261 * <li>Check if the ID does not start with "Etc/" or "SystemV/". If it does, return null.
262 * <li>Extract a substring after the last occurrence of "/".
263 * <li>Replace "_" with " ".
265 * For example, "New York" is returned for the time zone ID "America/New_York" when this object does not have the
266 * localized location name.
268 * @param tzID The canonical time zone ID
269 * @param name Receives the exemplar location name for the given time zone, or "bogus" state is set when a localized
270 * location name is not available and the fallback logic described above cannot extract location from the ID.
271 * @return A reference to the result.
274 virtual UnicodeString& getExemplarLocationName(const UnicodeString& tzID, UnicodeString& name) const;
277 * Returns the display name of the time zone at the given date.
279 * <b>Note:</b> This method calls the subclass's {@link #getTimeZoneDisplayName} first. When the
280 * result is bogus, this method calls {@link #getMetaZoneID} to get the meta zone ID mapped from the
281 * time zone, then calls {@link #getMetaZoneDisplayName}.
283 * @param tzID The canonical time zone ID.
284 * @param type The display name type. See {@link #UTimeZoneNameType}.
285 * @param date The date.
286 * @param name Receives the display name for the time zone at the given date. When this object does not have a localized display
287 * name for the time zone with the specified type and date, "bogus" state is set.
288 * @return A reference to the result.
291 virtual UnicodeString& getDisplayName(const UnicodeString& tzID, UTimeZoneNameType type, UDate date, UnicodeString& name) const;
294 * @internal For specific users only until proposed publicly.
295 * @deprecated This API is ICU internal only.
297 virtual void loadAllDisplayNames(UErrorCode& status);
300 * @internal For specific users only until proposed publicly.
301 * @deprecated This API is ICU internal only.
303 virtual void getDisplayNames(const UnicodeString& tzID, const UTimeZoneNameType types[], int32_t numTypes, UDate date, UnicodeString dest[], UErrorCode& status) const;
306 * <code>MatchInfoCollection</code> represents a collection of time zone name matches used by
307 * {@link TimeZoneNames#find}.
310 class U_I18N_API MatchInfoCollection : public UMemory {
316 MatchInfoCollection();
321 virtual ~MatchInfoCollection();
323 #ifndef U_HIDE_INTERNAL_API
326 * @param nameType The name type.
327 * @param matchLength The match length.
328 * @param tzID The time zone ID.
329 * @param status Receives the status
332 void addZone(UTimeZoneNameType nameType, int32_t matchLength,
333 const UnicodeString& tzID, UErrorCode& status);
336 * Adds a meata zone match.
337 * @param nameType The name type.
338 * @param matchLength The match length.
339 * @param mzID The metazone ID.
340 * @param status Receives the status
343 void addMetaZone(UTimeZoneNameType nameType, int32_t matchLength,
344 const UnicodeString& mzID, UErrorCode& status);
347 * Returns the number of entries available in this object.
348 * @return The number of entries.
351 int32_t size() const;
354 * Returns the time zone name type of a match at the specified index.
355 * @param idx The index
356 * @return The time zone name type. If the specified idx is out of range,
357 * it returns UTZNM_UNKNOWN.
358 * @see UTimeZoneNameType
361 UTimeZoneNameType getNameTypeAt(int32_t idx) const;
364 * Returns the match length of a match at the specified index.
365 * @param idx The index
366 * @return The match length. If the specified idx is out of range,
370 int32_t getMatchLengthAt(int32_t idx) const;
373 * Gets the zone ID of a match at the specified index.
374 * @param idx The index
375 * @param tzID Receives the zone ID.
376 * @return TRUE if the zone ID was set to tzID.
379 UBool getTimeZoneIDAt(int32_t idx, UnicodeString& tzID) const;
382 * Gets the metazone ID of a match at the specified index.
383 * @param idx The index
384 * @param mzID Receives the metazone ID
385 * @return TRUE if the meta zone ID was set to mzID.
388 UBool getMetaZoneIDAt(int32_t idx, UnicodeString& mzID) const;
389 #endif /* U_HIDE_INTERNAL_API */
392 UVector* fMatches; // vector of MatchEntry
394 UVector* matches(UErrorCode& status);
398 * Finds time zone name prefix matches for the input text at the
399 * given offset and returns a collection of the matches.
400 * @param text The text.
401 * @param start The starting offset within the text.
402 * @param types The set of name types represented by bitwise flags of UTimeZoneNameType enums,
403 * or UTZNM_UNKNOWN for all name types.
404 * @param status Receives the status.
405 * @return A collection of matches (owned by the caller), or NULL if no matches are found.
406 * @see UTimeZoneNameType
407 * @see MatchInfoCollection
410 virtual MatchInfoCollection* find(const UnicodeString& text, int32_t start, uint32_t types, UErrorCode& status) const = 0;