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Editing: tznames.h
// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ******************************************************************************* * Copyright (C) 2011-2016, International Business Machines Corporation and * others. All Rights Reserved. ******************************************************************************* */ #ifndef __TZNAMES_H #define __TZNAMES_H /** * \file * \brief C++ API: TimeZoneNames */ #include "unicode/utypes.h" #if U_SHOW_CPLUSPLUS_API #if !UCONFIG_NO_FORMATTING #include "unicode/uloc.h" #include "unicode/unistr.h" U_CDECL_BEGIN /** * Constants for time zone display name types. * @stable ICU 50 */ typedef enum UTimeZoneNameType { /** * Unknown display name type. * @stable ICU 50 */ UTZNM_UNKNOWN = 0x00, /** * Long display name, such as "Eastern Time". * @stable ICU 50 */ UTZNM_LONG_GENERIC = 0x01, /** * Long display name for standard time, such as "Eastern Standard Time". * @stable ICU 50 */ UTZNM_LONG_STANDARD = 0x02, /** * Long display name for daylight saving time, such as "Eastern Daylight Time". * @stable ICU 50 */ UTZNM_LONG_DAYLIGHT = 0x04, /** * Short display name, such as "ET". * @stable ICU 50 */ UTZNM_SHORT_GENERIC = 0x08, /** * Short display name for standard time, such as "EST". * @stable ICU 50 */ UTZNM_SHORT_STANDARD = 0x10, /** * Short display name for daylight saving time, such as "EDT". * @stable ICU 50 */ UTZNM_SHORT_DAYLIGHT = 0x20, /** * Exemplar location name, such as "Los Angeles". * @stable ICU 51 */ UTZNM_EXEMPLAR_LOCATION = 0x40 } UTimeZoneNameType; U_CDECL_END U_NAMESPACE_BEGIN class UVector; struct MatchInfo; /** * <code>TimeZoneNames</code> is an abstract class representing the time zone display name data model defined * by <a href="http://www.unicode.org/reports/tr35/">UTS#35 Unicode Locale Data Markup Language (LDML)</a>. * The model defines meta zone, which is used for storing a set of display names. A meta zone can be shared * by multiple time zones. Also a time zone may have multiple meta zone historic mappings. * <p> * For example, people in the United States refer the zone used by the east part of North America as "Eastern Time". * The tz database contains multiple time zones "America/New_York", "America/Detroit", "America/Montreal" and some * others that belong to "Eastern Time". However, assigning different display names to these time zones does not make * much sense for most of people. * <p> * In <a href="http://cldr.unicode.org/">CLDR</a> (which uses LDML for representing locale data), the display name * "Eastern Time" is stored as long generic display name of a meta zone identified by the ID "America_Eastern". * Then, there is another table maintaining the historic mapping to meta zones for each time zone. The time zones in * the above example ("America/New_York", "America/Detroit"...) are mapped to the meta zone "America_Eastern". * <p> * Sometimes, a time zone is mapped to a different time zone in the past. For example, "America/Indiana/Knox" * had been moving "Eastern Time" and "Central Time" back and forth. Therefore, it is necessary that time zone * to meta zones mapping data are stored by date range. * * <p><b>Note:</b> * The methods in this class assume that time zone IDs are already canonicalized. For example, you may not get proper * result returned by a method with time zone ID "America/Indiana/Indianapolis", because it's not a canonical time zone * ID (the canonical time zone ID for the time zone is "America/Indianapolis". See * {@link TimeZone#getCanonicalID(const UnicodeString& id, UnicodeString& canonicalID, UErrorCode& status)} about ICU * canonical time zone IDs. * * <p> * In CLDR, most of time zone display names except location names are provided through meta zones. But a time zone may * have a specific name that is not shared with other time zones. * * For example, time zone "Europe/London" has English long name for standard time "Greenwich Mean Time", which is also * shared with other time zones. However, the long name for daylight saving time is "British Summer Time", which is only * used for "Europe/London". * * <p> * {@link #getTimeZoneDisplayName} is designed for accessing a name only used by a single time zone. * But is not necessarily mean that a subclass implementation use the same model with CLDR. A subclass implementation * may provide time zone names only through {@link #getTimeZoneDisplayName}, or only through {@link #getMetaZoneDisplayName}, * or both. * * <p> * The default <code>TimeZoneNames</code> implementation returned by {@link #createInstance} * uses the locale data imported from CLDR. In CLDR, set of meta zone IDs and mappings between zone IDs and meta zone * IDs are shared by all locales. Therefore, the behavior of {@link #getAvailableMetaZoneIDs}, * {@link #getMetaZoneID}, and {@link #getReferenceZoneID} won't be changed no matter * what locale is used for getting an instance of <code>TimeZoneNames</code>. * * @stable ICU 50 */ class U_I18N_API TimeZoneNames : public UObject { public: /** * Destructor. * @stable ICU 50 */ virtual ~TimeZoneNames(); /** * Return true if the given TimeZoneNames objects are semantically equal. * @param other the object to be compared with. * @return Return TRUE if the given Format objects are semantically equal. * @stable ICU 50 */ virtual UBool operator==(const TimeZoneNames& other) const = 0; /** * Return true if the given TimeZoneNames objects are not semantically * equal. * @param other the object to be compared with. * @return Return TRUE if the given Format objects are not semantically equal. * @stable ICU 50 */ UBool operator!=(const TimeZoneNames& other) const { return !operator==(other); } /** * Clone this object polymorphically. The caller is responsible * for deleting the result when done. * @return A copy of the object * @stable ICU 50 */ virtual TimeZoneNames* clone() const = 0; /** * Returns an instance of <code>TimeZoneNames</code> for the specified locale. * * @param locale The locale. * @param status Receives the status. * @return An instance of <code>TimeZoneNames</code> * @stable ICU 50 */ static TimeZoneNames* U_EXPORT2 createInstance(const Locale& locale, UErrorCode& status); /** * Returns an instance of <code>TimeZoneNames</code> containing only short specific * zone names (SHORT_STANDARD and SHORT_DAYLIGHT), * compatible with the IANA tz database's zone abbreviations (not localized). * <br> * Note: The input locale is used for resolving ambiguous names (e.g. "IST" is parsed * as Israel Standard Time for Israel, while it is parsed as India Standard Time for * all other regions). The zone names returned by this instance are not localized. * @stable ICU 54 */ static TimeZoneNames* U_EXPORT2 createTZDBInstance(const Locale& locale, UErrorCode& status); /** * Returns an enumeration of all available meta zone IDs. * @param status Receives the status. * @return an enumeration object, owned by the caller. * @stable ICU 50 */ virtual StringEnumeration* getAvailableMetaZoneIDs(UErrorCode& status) const = 0; /** * Returns an enumeration of all available meta zone IDs used by the given time zone. * @param tzID The canoical tiem zone ID. * @param status Receives the status. * @return an enumeration object, owned by the caller. * @stable ICU 50 */ virtual StringEnumeration* getAvailableMetaZoneIDs(const UnicodeString& tzID, UErrorCode& status) const = 0; /** * Returns the meta zone ID for the given canonical time zone ID at the given date. * @param tzID The canonical time zone ID. * @param date The date. * @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 * corresponding meta zone at the given date or the implementation does not support meta zones, "bogus" state * is set. * @return A reference to the result. * @stable ICU 50 */ virtual UnicodeString& getMetaZoneID(const UnicodeString& tzID, UDate date, UnicodeString& mzID) const = 0; /** * Returns the reference zone ID for the given meta zone ID for the region. * * Note: Each meta zone must have a reference zone associated with a special region "001" (world). * Some meta zones may have region specific reference zone IDs other than the special region * "001". When a meta zone does not have any region specific reference zone IDs, this method * return the reference zone ID for the special region "001" (world). * * @param mzID The meta zone ID. * @param region The region. * @param tzID Receives the reference zone ID ("golden zone" in the LDML specification) for the given time zone ID for the * region. If the meta zone is unknown or the implementation does not support meta zones, "bogus" state * is set. * @return A reference to the result. * @stable ICU 50 */ virtual UnicodeString& getReferenceZoneID(const UnicodeString& mzID, const char* region, UnicodeString& tzID) const = 0; /** * Returns the display name of the meta zone. * @param mzID The meta zone ID. * @param type The display name type. See {@link #UTimeZoneNameType}. * @param name Receives the display name of the meta zone. When this object does not have a localized display name for the given * meta zone with the specified type or the implementation does not provide any display names associated * with meta zones, "bogus" state is set. * @return A reference to the result. * @stable ICU 50 */ virtual UnicodeString& getMetaZoneDisplayName(const UnicodeString& mzID, UTimeZoneNameType type, UnicodeString& name) const = 0; /** * Returns the display name of the time zone. Unlike {@link #getDisplayName}, * this method does not get a name from a meta zone used by the time zone. * @param tzID The canonical time zone ID. * @param type The display name type. See {@link #UTimeZoneNameType}. * @param name Receives the display name for the time zone. When this object does not have a localized display name for the given * time zone with the specified type, "bogus" state is set. * @return A reference to the result. * @stable ICU 50 */ virtual UnicodeString& getTimeZoneDisplayName(const UnicodeString& tzID, UTimeZoneNameType type, UnicodeString& name) const = 0; /** * Returns the exemplar location name for the given time zone. When this object does not have a localized location * name, the default implementation may still returns a programmatically generated name with the logic described * below. * <ol> * <li>Check if the ID contains "/". If not, return null. * <li>Check if the ID does not start with "Etc/" or "SystemV/". If it does, return null. * <li>Extract a substring after the last occurrence of "/". * <li>Replace "_" with " ". * </ol> * For example, "New York" is returned for the time zone ID "America/New_York" when this object does not have the * localized location name. * * @param tzID The canonical time zone ID * @param name Receives the exemplar location name for the given time zone, or "bogus" state is set when a localized * location name is not available and the fallback logic described above cannot extract location from the ID. * @return A reference to the result. * @stable ICU 50 */ virtual UnicodeString& getExemplarLocationName(const UnicodeString& tzID, UnicodeString& name) const; /** * Returns the display name of the time zone at the given date. * <p> * <b>Note:</b> This method calls the subclass's {@link #getTimeZoneDisplayName} first. When the * result is bogus, this method calls {@link #getMetaZoneID} to get the meta zone ID mapped from the * time zone, then calls {@link #getMetaZoneDisplayName}. * * @param tzID The canonical time zone ID. * @param type The display name type. See {@link #UTimeZoneNameType}. * @param date The date. * @param name Receives the display name for the time zone at the given date. When this object does not have a localized display * name for the time zone with the specified type and date, "bogus" state is set. * @return A reference to the result. * @stable ICU 50 */ virtual UnicodeString& getDisplayName(const UnicodeString& tzID, UTimeZoneNameType type, UDate date, UnicodeString& name) const; /** * @internal ICU internal only, for specific users only until proposed publicly. */ virtual void loadAllDisplayNames(UErrorCode& status); /** * @internal ICU internal only, for specific users only until proposed publicly. */ virtual void getDisplayNames(const UnicodeString& tzID, const UTimeZoneNameType types[], int32_t numTypes, UDate date, UnicodeString dest[], UErrorCode& status) const; /** * <code>MatchInfoCollection</code> represents a collection of time zone name matches used by * {@link TimeZoneNames#find}. * @internal */ class U_I18N_API MatchInfoCollection : public UMemory { public: /** * Constructor. * @internal */ MatchInfoCollection(); /** * Destructor. * @internal */ virtual ~MatchInfoCollection(); #ifndef U_HIDE_INTERNAL_API /** * Adds a zone match. * @param nameType The name type. * @param matchLength The match length. * @param tzID The time zone ID. * @param status Receives the status * @internal */ void addZone(UTimeZoneNameType nameType, int32_t matchLength, const UnicodeString& tzID, UErrorCode& status); /** * Adds a meata zone match. * @param nameType The name type. * @param matchLength The match length. * @param mzID The metazone ID. * @param status Receives the status * @internal */ void addMetaZone(UTimeZoneNameType nameType, int32_t matchLength, const UnicodeString& mzID, UErrorCode& status); /** * Returns the number of entries available in this object. * @return The number of entries. * @internal */ int32_t size() const; /** * Returns the time zone name type of a match at the specified index. * @param idx The index * @return The time zone name type. If the specified idx is out of range, * it returns UTZNM_UNKNOWN. * @see UTimeZoneNameType * @internal */ UTimeZoneNameType getNameTypeAt(int32_t idx) const; /** * Returns the match length of a match at the specified index. * @param idx The index * @return The match length. If the specified idx is out of range, * it returns 0. * @internal */ int32_t getMatchLengthAt(int32_t idx) const; /** * Gets the zone ID of a match at the specified index. * @param idx The index * @param tzID Receives the zone ID. * @return TRUE if the zone ID was set to tzID. * @internal */ UBool getTimeZoneIDAt(int32_t idx, UnicodeString& tzID) const; /** * Gets the metazone ID of a match at the specified index. * @param idx The index * @param mzID Receives the metazone ID * @return TRUE if the meta zone ID was set to mzID. * @internal */ UBool getMetaZoneIDAt(int32_t idx, UnicodeString& mzID) const; #endif /* U_HIDE_INTERNAL_API */ private: UVector* fMatches; // vector of MatchEntry UVector* matches(UErrorCode& status); }; /** * Finds time zone name prefix matches for the input text at the * given offset and returns a collection of the matches. * @param text The text. * @param start The starting offset within the text. * @param types The set of name types represented by bitwise flags of UTimeZoneNameType enums, * or UTZNM_UNKNOWN for all name types. * @param status Receives the status. * @return A collection of matches (owned by the caller), or NULL if no matches are found. * @see UTimeZoneNameType * @see MatchInfoCollection * @internal */ virtual MatchInfoCollection* find(const UnicodeString& text, int32_t start, uint32_t types, UErrorCode& status) const = 0; }; U_NAMESPACE_END #endif #endif /* U_SHOW_CPLUSPLUS_API */ #endif
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