com.ibm.icu.text.TimeZoneNames Maven / Gradle / Ivy
// © 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.
*******************************************************************************
*/
package com.ibm.icu.text;
import java.io.Serializable;
import java.util.Collection;
import java.util.Collections;
import java.util.EnumSet;
import java.util.Locale;
import java.util.Set;
import com.ibm.icu.impl.ICUConfig;
import com.ibm.icu.impl.SoftCache;
import com.ibm.icu.impl.TZDBTimeZoneNames;
import com.ibm.icu.impl.TimeZoneNamesImpl;
import com.ibm.icu.util.TimeZone;
import com.ibm.icu.util.ULocale;
/**
* TimeZoneNames is an abstract class representing the time zone display name data model defined
* by UTS#35 Unicode Locale Data Markup Language (LDML).
* 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.
*
* 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.
*
* In CLDR (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".
*
* 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.
*
*
Note:
*
* {@link TimeZoneFormat} assumes an instance of TimeZoneNames is immutable. If you want to provide
* your own TimeZoneNames implementation and use it with {@link TimeZoneFormat}, you must follow
* the contract.
*
* 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(String)} about ICU canonical time zone IDs.
*
*
* 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".
*
*
* {@link #getTimeZoneDisplayName(String, NameType)} 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(String, NameType)}, or only through
* {@link #getMetaZoneDisplayName(String, NameType)}, or both.
*
*
* The default TimeZoneNames implementation returned by {@link #getInstance(ULocale)} 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 #getAvailableMetaZoneIDs(String)},
* {@link #getMetaZoneID(String, long)}, and {@link #getReferenceZoneID(String, String)} won't be changed no matter
* what locale is used for getting an instance of TimeZoneNames.
*
* @stable ICU 49
*/
public abstract class TimeZoneNames implements Serializable {
private static final long serialVersionUID = -9180227029248969153L;
/**
* Time zone display name types
*
* @stable ICU 49
*/
public enum NameType {
/**
* Long display name, such as "Eastern Time".
*
* @stable ICU 49
*/
LONG_GENERIC,
/**
* Long display name for standard time, such as "Eastern Standard Time".
*
* @stable ICU 49
*/
LONG_STANDARD,
/**
* Long display name for daylight saving time, such as "Eastern Daylight Time".
*
* @stable ICU 49
*/
LONG_DAYLIGHT,
/**
* Short display name, such as "ET".
*
* @stable ICU 49
*/
SHORT_GENERIC,
/**
* Short display name for standard time, such as "EST".
*
* @stable ICU 49
*/
SHORT_STANDARD,
/**
* Short display name for daylight saving time, such as "EDT".
*
* @stable ICU 49
*/
SHORT_DAYLIGHT,
/**
* Exemplar location name, such as "Los Angeles".
*
* @stable ICU 51
*/
EXEMPLAR_LOCATION,
}
private static Cache TZNAMES_CACHE = new Cache();
private static final Factory TZNAMES_FACTORY;
private static final String FACTORY_NAME_PROP = "com.ibm.icu.text.TimeZoneNames.Factory.impl";
private static final String DEFAULT_FACTORY_CLASS = "com.ibm.icu.impl.TimeZoneNamesFactoryImpl";
static {
Factory factory = null;
String classname = ICUConfig.get(FACTORY_NAME_PROP, DEFAULT_FACTORY_CLASS);
while (true) {
try {
factory = (Factory) Class.forName(classname).newInstance();
break;
} catch (ClassNotFoundException cnfe) {
// fall through
} catch (IllegalAccessException iae) {
// fall through
} catch (InstantiationException ie) {
// fall through
}
if (classname.equals(DEFAULT_FACTORY_CLASS)) {
break;
}
classname = DEFAULT_FACTORY_CLASS;
}
if (factory == null) {
factory = new DefaultTimeZoneNames.FactoryImpl();
}
TZNAMES_FACTORY = factory;
}
/**
* Returns an instance of TimeZoneNames for the specified locale.
*
* @param locale
* The locale.
* @return An instance of TimeZoneNames
* @stable ICU 49
*/
public static TimeZoneNames getInstance(ULocale locale) {
String key = locale.getBaseName();
return TZNAMES_CACHE.getInstance(key, locale);
}
/**
* Returns an instance of TimeZoneNames for the specified
* {@link java.util.Locale}.
*
* @param locale
* The {@link java.util.Locale}.
* @return An instance of TimeZoneDisplayNames
* @stable ICU 54
*/
public static TimeZoneNames getInstance(Locale locale) {
return getInstance(ULocale.forLocale(locale));
}
/**
* Returns an instance of TimeZoneNames containing only short specific
* zone names ({@link NameType#SHORT_STANDARD} and {@link NameType#SHORT_DAYLIGHT}),
* compatible with the IANA tz database's zone abbreviations (not localized).
*
* 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
*/
public static TimeZoneNames getTZDBInstance(ULocale locale) {
return new TZDBTimeZoneNames(locale);
}
/**
* Returns an immutable set of all available meta zone IDs.
* @return An immutable set of all available meta zone IDs.
* @stable ICU 49
*/
public abstract Set getAvailableMetaZoneIDs();
/**
* Returns an immutable set of all available meta zone IDs used by the given time zone.
*
* @param tzID
* The canonical time zone ID.
* @return An immutable set of all available meta zone IDs used by the given time zone.
* @stable ICU 49
*/
public abstract Set getAvailableMetaZoneIDs(String tzID);
/**
* 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.
* @return 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, null is
* returned.
* @stable ICU 49
*/
public abstract String getMetaZoneID(String tzID, long date);
/**
* 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.
* @return 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, null is returned.
* @stable ICU 49
*/
public abstract String getReferenceZoneID(String mzID, String region);
/**
* Returns the display name of the meta zone.
*
* @param mzID
* The meta zone ID.
* @param type
* The display name type. See {@link TimeZoneNames.NameType}.
* @return 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, null is returned.
* @stable ICU 49
*/
public abstract String getMetaZoneDisplayName(String mzID, NameType type);
/**
* Returns the display name of the time zone at the given date.
*
*
* Note: This method calls the subclass's {@link #getTimeZoneDisplayName(String, NameType)} first. When the
* result is null, this method calls {@link #getMetaZoneID(String, long)} to get the meta zone ID mapped from the
* time zone, then calls {@link #getMetaZoneDisplayName(String, NameType)}.
*
* @param tzID
* The canonical time zone ID.
* @param type
* The display name type. See {@link TimeZoneNames.NameType}.
* @param date
* The date
* @return 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, null is returned.
* @stable ICU 49
*/
public final String getDisplayName(String tzID, NameType type, long date) {
String name = getTimeZoneDisplayName(tzID, type);
if (name == null) {
String mzID = getMetaZoneID(tzID, date);
name = getMetaZoneDisplayName(mzID, type);
}
return name;
}
/**
* Returns the display name of the time zone. Unlike {@link #getDisplayName(String, NameType, long)},
* 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 TimeZoneNames.NameType}.
* @return 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, null is returned.
* @stable ICU 49
*/
public abstract String getTimeZoneDisplayName(String tzID, NameType type);
/**
* 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.
*
* - Check if the ID contains "/". If not, return null.
*
- Check if the ID does not start with "Etc/" or "SystemV/". If it does, return null.
*
- Extract a substring after the last occurrence of "/".
*
- Replace "_" with " ".
*
* 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
* @return The exemplar location name for the given time zone, or null when a localized location name is not
* available and the fallback logic described above cannot extract location from the ID.
* @stable ICU 49
*/
public String getExemplarLocationName(String tzID) {
return TimeZoneNamesImpl.getDefaultExemplarLocationName(tzID);
}
/**
* 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, or null for all name types.
* @return A collection of matches.
* @see NameType
* @see MatchInfo
* @draft ICU 49 (Retain)
*/
public Collection find(CharSequence text, int start, EnumSet types) {
throw new UnsupportedOperationException("The method is not implemented in TimeZoneNames base class.");
}
/**
* A MatchInfo represents a time zone name match used by
* {@link TimeZoneNames#find(CharSequence, int, EnumSet)}.
* @draft ICU 49 (Retain)
*/
public static class MatchInfo {
private NameType _nameType;
private String _tzID;
private String _mzID;
private int _matchLength;
/**
* Constructing a MatchInfo.
*
* @param nameType the name type enum.
* @param tzID the time zone ID, or null
* @param mzID the meta zone ID, or null
* @param matchLength the match length.
* @throws IllegalArgumentException when 1) nameType is null,
* or 2) both tzID and mzID are null,
* or 3) matchLength is 0 or smaller.
* @see NameType
* @draft ICU 49 (Retain)
*/
public MatchInfo(NameType nameType, String tzID, String mzID, int matchLength) {
if (nameType == null) {
throw new IllegalArgumentException("nameType is null");
}
if (tzID == null && mzID == null) {
throw new IllegalArgumentException("Either tzID or mzID must be available");
}
if (matchLength <= 0) {
throw new IllegalArgumentException("matchLength must be positive value");
}
_nameType = nameType;
_tzID = tzID;
_mzID = mzID;
_matchLength = matchLength;
}
/**
* Returns the time zone ID, or null if not available.
*
* Note: A MatchInfo must have either a time zone ID
* or a meta zone ID.
*
* @return the time zone ID, or null.
* @see #mzID()
* @draft ICU 49 (Retain)
*/
public String tzID() {
return _tzID;
}
/**
* Returns the meta zone ID, or null if not available.
*
*
Note: A MatchInfo must have either a time zone ID
* or a meta zone ID.
*
* @return the meta zone ID, or null.
* @see #tzID()
* @draft ICU 49 (Retain)
*/
public String mzID() {
return _mzID;
}
/**
* Returns the time zone name type.
* @return the time zone name type enum.
* @see NameType
* @draft ICU 49 (Retain)
*/
public NameType nameType() {
return _nameType;
}
/**
* Returns the match length.
* @return the match length.
* @draft ICU 49 (Retain)
*/
public int matchLength() {
return _matchLength;
}
}
/**
* @internal For specific users only until proposed publicly.
* @deprecated This API is ICU internal only.
*/
@Deprecated
public void loadAllDisplayNames() {}
/**
* @internal For specific users only until proposed publicly.
* @deprecated This API is ICU internal only.
*/
@Deprecated
public void getDisplayNames(String tzID, NameType[] types, long date,
String[] dest, int destOffset) {
if (tzID == null || tzID.length() == 0) {
return;
}
String mzID = null;
for (int i = 0; i < types.length; ++i) {
NameType type = types[i];
String name = getTimeZoneDisplayName(tzID, type);
if (name == null) {
if (mzID == null) {
mzID = getMetaZoneID(tzID, date);
}
name = getMetaZoneDisplayName(mzID, type);
}
dest[destOffset + i] = name;
}
}
/**
* Sole constructor for invocation by subclass constructors.
*
* @draft ICU 49 (Retain)
*/
protected TimeZoneNames() {
}
/**
* The super class of TimeZoneNames service factory classes.
*
* @internal
* @deprecated This API is ICU internal only.
*/
@Deprecated
public static abstract class Factory {
/**
* The factory method of TimeZoneNames.
*
* @param locale
* The display locale
* @return An instance of TimeZoneNames.
* @internal
* @deprecated This API is ICU internal only.
*/
@Deprecated
public abstract TimeZoneNames getTimeZoneNames(ULocale locale);
/**
* Sole constructor
* @internal
* @deprecated This API is ICU internal only.
*/
@Deprecated
protected Factory() {
}
}
/**
* TimeZoneNames cache used by {@link TimeZoneNames#getInstance(ULocale)}
*/
private static class Cache extends SoftCache {
/*
* (non-Javadoc)
*
* @see com.ibm.icu.impl.CacheBase#createInstance(java.lang.Object, java.lang.Object)
*/
@Override
protected TimeZoneNames createInstance(String key, ULocale data) {
return TZNAMES_FACTORY.getTimeZoneNames(data);
}
}
///CLOVER:OFF
/**
* The default implementation of TimeZoneNames used by {@link TimeZoneNames#getInstance(ULocale)} when
* the ICU4J tznamedata component is not available.
*/
private static class DefaultTimeZoneNames extends TimeZoneNames {
private static final long serialVersionUID = -995672072494349071L;
public static final DefaultTimeZoneNames INSTANCE = new DefaultTimeZoneNames();
/* (non-Javadoc)
* @see com.ibm.icu.text.TimeZoneNames#getAvailableMetaZoneIDs()
*/
@Override
public Set getAvailableMetaZoneIDs() {
return Collections.emptySet();
}
/* (non-Javadoc)
* @see com.ibm.icu.text.TimeZoneNames#getAvailableMetaZoneIDs(java.lang.String)
*/
@Override
public Set getAvailableMetaZoneIDs(String tzID) {
return Collections.emptySet();
}
/*
* (non-Javadoc)
*
* @see com.ibm.icu.text.TimeZoneNames#getMetaZoneID (java.lang.String, long)
*/
@Override
public String getMetaZoneID(String tzID, long date) {
return null;
}
/*
* (non-Javadoc)
*
* @see com.ibm.icu.text.TimeZoneNames#getReferenceZoneID(java.lang.String, java.lang.String)
*/
@Override
public String getReferenceZoneID(String mzID, String region) {
return null;
}
/*
* (non-Javadoc)
* @see com.ibm.icu.text.TimeZoneNames#getMetaZoneDisplayName(java.lang.String, com.ibm.icu.text.TimeZoneNames.NameType)
*/
@Override
public String getMetaZoneDisplayName(String mzID, NameType type) {
return null;
}
/*
* (non-Javadoc)
* @see com.ibm.icu.text.TimeZoneNames#getTimeZoneDisplayName(java.lang.String, com.ibm.icu.text.TimeZoneNames.NameType)
*/
@Override
public String getTimeZoneDisplayName(String tzID, NameType type) {
return null;
}
/* (non-Javadoc)
* @see com.ibm.icu.text.TimeZoneNames#find(java.lang.CharSequence, int, com.ibm.icu.text.TimeZoneNames.NameType[])
*/
@Override
public Collection find(CharSequence text, int start, EnumSet nameTypes) {
return Collections.emptyList();
}
/**
* The default TimeZoneNames factory called from {@link TimeZoneNames#getInstance(ULocale)} when
* the ICU4J tznamedata component is not available.
*/
public static class FactoryImpl extends Factory {
/*
* (non-Javadoc)
*
* @see com.ibm.icu.text.TimeZoneNames.Factory#getTimeZoneNames (com.ibm.icu.util.ULocale)
*/
@Override
public TimeZoneNames getTimeZoneNames(ULocale locale) {
return DefaultTimeZoneNames.INSTANCE;
}
}
}
///CLOVER:ON
}