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/*
*******************************************************************************
* Copyright (C) 2011-2012, 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 !UCONFIG_NO_FORMATTING
#ifndef U_HIDE_INTERNAL_API
#include "unicode/uloc.h"
#include "unicode/unistr.h"
U_CDECL_BEGIN
/**
* Constants for time zone display name types.
* @draft ICU 50
*/
typedef enum UTimeZoneNameType {
/**
* Unknown display name type.
* @draft ICU 50
*/
UTZNM_UNKNOWN = 0x00,
/**
* Long display name, such as "Eastern Time".
* @draft ICU 50
*/
UTZNM_LONG_GENERIC = 0x01,
/**
* Long display name for standard time, such as "Eastern Standard Time".
* @draft ICU 50
*/
UTZNM_LONG_STANDARD = 0x02,
/**
* Long display name for daylight saving time, such as "Eastern Daylight Time".
* @draft ICU 50
*/
UTZNM_LONG_DAYLIGHT = 0x04,
/**
* Short display name, such as "ET".
* @draft ICU 50
*/
UTZNM_SHORT_GENERIC = 0x08,
/**
* Short display name for standard time, such as "EST".
* @draft ICU 50
*/
UTZNM_SHORT_STANDARD = 0x10,
/**
* Short display name for daylight saving time, such as "EDT".
* @draft ICU 50
*/
UTZNM_SHORT_DAYLIGHT = 0x20
} 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.
*
* @draft ICU 50
*/
class U_I18N_API TimeZoneNames : public UObject {
public:
/**
* Destructor.
* @draft ICU 50
*/
virtual ~TimeZoneNames();
/**
* Return true if the given TimeZoneNames objects are emantically equal.
* @param other the object to be compared with.
* @return Return TRUE if the given Format objects are semantically equal.
* @draft 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.
* @draft 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
* @draft ICU 50
*/
virtual TimeZoneNames* clone() const = 0;
/**
* Returns an instance of <code>TimeZoneDisplayNames</code> for the specified locale.
*
* @param locale The locale.
* @param status Recevies the status.
* @return An instance of <code>TimeZoneDisplayNames</code>
* @draft ICU 50
*/
static TimeZoneNames* U_EXPORT2 createInstance(const Locale& locale, UErrorCode& status);
/**
* Returns an enumeration of all available meta zone IDs.
* @param status Recevies the status.
* @return an enumeration object, owned by the caller.
* @draft 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 Recevies the status.
* @return an enumeration object, owned by the caller.
* @draft 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.
* @draft 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.
* @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.
* @draft 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.
* @draft 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.
* @draft 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.
* @draft 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.
* @draft ICU 50
*/
virtual UnicodeString& getDisplayName(const UnicodeString& tzID, UTimeZoneNameType type, UDate date, UnicodeString& name) 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();
/**
* 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;
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;
private:
// No ICU "poor man's RTTI" for this class nor its subclasses.
virtual UClassID getDynamicClassID() const;
};
U_NAMESPACE_END
#endif /* U_HIDE_INTERNAL_API */
#endif
#endif