JDK8/Java8源码在线阅读
/*
* Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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/*
* (C) Copyright Taligent, Inc. 1996 - All Rights Reserved
* (C) Copyright IBM Corp. 1996 - All Rights Reserved
*
* The original version of this source code and documentation is copyrighted
* and owned by Taligent, Inc., a wholly-owned subsidiary of IBM. These
* materials are provided under terms of a License Agreement between Taligent
* and Sun. This technology is protected by multiple US and International
* patents. This notice and attribution to Taligent may not be removed.
* Taligent is a registered trademark of Taligent, Inc.
*
*/
package java.text;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.lang.ref.SoftReference;
import java.text.spi.DateFormatSymbolsProvider;
import java.util.Arrays;
import java.util.Locale;
import java.util.Objects;
import java.util.ResourceBundle;
import java.util.TimeZone;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import sun.util.locale.provider.LocaleProviderAdapter;
import sun.util.locale.provider.LocaleServiceProviderPool;
import sun.util.locale.provider.ResourceBundleBasedAdapter;
import sun.util.locale.provider.TimeZoneNameUtility;
/**
* <code>DateFormatSymbols</code> is a public class for encapsulating
* localizable date-time formatting data, such as the names of the
* months, the names of the days of the week, and the time zone data.
* <code>SimpleDateFormat</code> uses
* <code>DateFormatSymbols</code> to encapsulate this information.
*
* <p>
* Typically you shouldn't use <code>DateFormatSymbols</code> directly.
* Rather, you are encouraged to create a date-time formatter with the
* <code>DateFormat</code> class's factory methods: <code>getTimeInstance</code>,
* <code>getDateInstance</code>, or <code>getDateTimeInstance</code>.
* These methods automatically create a <code>DateFormatSymbols</code> for
* the formatter so that you don't have to. After the
* formatter is created, you may modify its format pattern using the
* <code>setPattern</code> method. For more information about
* creating formatters using <code>DateFormat</code>'s factory methods,
* see {@link DateFormat}.
*
* <p>
* If you decide to create a date-time formatter with a specific
* format pattern for a specific locale, you can do so with:
* <blockquote>
* <pre>
* new SimpleDateFormat(aPattern, DateFormatSymbols.getInstance(aLocale)).
* </pre>
* </blockquote>
*
* <p>
* <code>DateFormatSymbols</code> objects are cloneable. When you obtain
* a <code>DateFormatSymbols</code> object, feel free to modify the
* date-time formatting data. For instance, you can replace the localized
* date-time format pattern characters with the ones that you feel easy
* to remember. Or you can change the representative cities
* to your favorite ones.
*
* <p>
* New <code>DateFormatSymbols</code> subclasses may be added to support
* <code>SimpleDateFormat</code> for date-time formatting for additional locales.
* @see DateFormat
* @see SimpleDateFormat
* @see java.util.SimpleTimeZone
* @author Chen-Lieh Huang
*/
public class DateFormatSymbols implements Serializable, Cloneable {
/**
* Construct a DateFormatSymbols object by loading format data from
* resources for the default {@link java.util.Locale.Category#FORMAT FORMAT}
* locale. This constructor can only
* construct instances for the locales supported by the Java
* runtime environment, not for those supported by installed
* {@link java.text.spi.DateFormatSymbolsProvider DateFormatSymbolsProvider}
* implementations. For full locale coverage, use the
* {@link #getInstance(Locale) getInstance} method.
* <p>This is equivalent to calling
* {@link #DateFormatSymbols(Locale)
* DateFormatSymbols(Locale.getDefault(Locale.Category.FORMAT))}.
* @see #getInstance()
* @see java.util.Locale#getDefault(java.util.Locale.Category)
* @see java.util.Locale.Category#FORMAT
* @exception java.util.MissingResourceException
* if the resources for the default locale cannot be
* found or cannot be loaded.
*/
public DateFormatSymbols()
{
initializeData(Locale.getDefault(Locale.Category.FORMAT));
}
/**
* Construct a DateFormatSymbols object by loading format data from
* resources for the given locale. This constructor can only
* construct instances for the locales supported by the Java
* runtime environment, not for those supported by installed
* {@link java.text.spi.DateFormatSymbolsProvider DateFormatSymbolsProvider}
* implementations. For full locale coverage, use the
* {@link #getInstance(Locale) getInstance} method.
*
* @param locale the desired locale
* @see #getInstance(Locale)
* @exception java.util.MissingResourceException
* if the resources for the specified locale cannot be
* found or cannot be loaded.
*/
public DateFormatSymbols(Locale locale)
{
initializeData(locale);
}
/**
* Era strings. For example: "AD" and "BC". An array of 2 strings,
* indexed by <code>Calendar.BC</code> and <code>Calendar.AD</code>.
* @serial
*/
String eras[] = null;
/**
* Month strings. For example: "January", "February", etc. An array
* of 13 strings (some calendars have 13 months), indexed by
* <code>Calendar.JANUARY</code>, <code>Calendar.FEBRUARY</code>, etc.
* @serial
*/
String months[] = null;
/**
* Short month strings. For example: "Jan", "Feb", etc. An array of
* 13 strings (some calendars have 13 months), indexed by
* <code>Calendar.JANUARY</code>, <code>Calendar.FEBRUARY</code>, etc.
* @serial
*/
String shortMonths[] = null;
/**
* Weekday strings. For example: "Sunday", "Monday", etc. An array
* of 8 strings, indexed by <code>Calendar.SUNDAY</code>,
* <code>Calendar.MONDAY</code>, etc.
* The element <code>weekdays[0]</code> is ignored.
* @serial
*/
String weekdays[] = null;
/**
* Short weekday strings. For example: "Sun", "Mon", etc. An array
* of 8 strings, indexed by <code>Calendar.SUNDAY</code>,
* <code>Calendar.MONDAY</code>, etc.
* The element <code>shortWeekdays[0]</code> is ignored.
* @serial
*/
String shortWeekdays[] = null;
/**
* AM and PM strings. For example: "AM" and "PM". An array of
* 2 strings, indexed by <code>Calendar.AM</code> and
* <code>Calendar.PM</code>.
* @serial
*/
String ampms[] = null;
/**
* Localized names of time zones in this locale. This is a
* two-dimensional array of strings of size <em>n</em> by <em>m</em>,
* where <em>m</em> is at least 5. Each of the <em>n</em> rows is an
* entry containing the localized names for a single <code>TimeZone</code>.
* Each such row contains (with <code>i</code> ranging from
* 0..<em>n</em>-1):
* <ul>
* <li><code>zoneStrings[i][0]</code> - time zone ID</li>
* <li><code>zoneStrings[i][1]</code> - long name of zone in standard
* time</li>
* <li><code>zoneStrings[i][2]</code> - short name of zone in
* standard time</li>
* <li><code>zoneStrings[i][3]</code> - long name of zone in daylight
* saving time</li>
* <li><code>zoneStrings[i][4]</code> - short name of zone in daylight
* saving time</li>
* </ul>
* The zone ID is <em>not</em> localized; it's one of the valid IDs of
* the {@link java.util.TimeZone TimeZone} class that are not
* <a href="../java/util/TimeZone.html#CustomID">custom IDs</a>.
* All other entries are localized names.
* @see java.util.TimeZone
* @serial
*/
String zoneStrings[][] = null;
/**
* Indicates that zoneStrings is set externally with setZoneStrings() method.
*/
transient boolean isZoneStringsSet = false;
/**
* Unlocalized date-time pattern characters. For example: 'y', 'd', etc.
* All locales use the same these unlocalized pattern characters.
*/
static final String patternChars = "GyMdkHmsSEDFwWahKzZYuXL";
static final int PATTERN_ERA = 0; // G
static final int PATTERN_YEAR = 1; // y
static final int PATTERN_MONTH = 2; // M
static final int PATTERN_DAY_OF_MONTH = 3; // d
static final int PATTERN_HOUR_OF_DAY1 = 4; // k
static final int PATTERN_HOUR_OF_DAY0 = 5; // H
static final int PATTERN_MINUTE = 6; // m
static final int PATTERN_SECOND = 7; // s
static final int PATTERN_MILLISECOND = 8; // S
static final int PATTERN_DAY_OF_WEEK = 9; // E
static final int PATTERN_DAY_OF_YEAR = 10; // D
static final int PATTERN_DAY_OF_WEEK_IN_MONTH = 11; // F
static final int PATTERN_WEEK_OF_YEAR = 12; // w
static final int PATTERN_WEEK_OF_MONTH = 13; // W
static final int PATTERN_AM_PM = 14; // a
static final int PATTERN_HOUR1 = 15; // h
static final int PATTERN_HOUR0 = 16; // K
static final int PATTERN_ZONE_NAME = 17; // z
static final int PATTERN_ZONE_VALUE = 18; // Z
static final int PATTERN_WEEK_YEAR = 19; // Y
static final int PATTERN_ISO_DAY_OF_WEEK = 20; // u
static final int PATTERN_ISO_ZONE = 21; // X
static final int PATTERN_MONTH_STANDALONE = 22; // L
/**
* Localized date-time pattern characters. For example, a locale may
* wish to use 'u' rather than 'y' to represent years in its date format
* pattern strings.
* This string must be exactly 18 characters long, with the index of
* the characters described by <code>DateFormat.ERA_FIELD</code>,
* <code>DateFormat.YEAR_FIELD</code>, etc. Thus, if the string were
* "Xz...", then localized patterns would use 'X' for era and 'z' for year.
* @serial
*/
String localPatternChars = null;
/**
* The locale which is used for initializing this DateFormatSymbols object.
*
* @since 1.6
* @serial
*/
Locale locale = null;
/* use serialVersionUID from JDK 1.1.4 for interoperability */
static final long serialVersionUID = -5987973545549424702L;
/**
* Returns an array of all locales for which the
* <code>getInstance</code> methods of this class can return
* localized instances.
* The returned array represents the union of locales supported by the
* Java runtime and by installed
* {@link java.text.spi.DateFormatSymbolsProvider DateFormatSymbolsProvider}
* implementations. It must contain at least a <code>Locale</code>
* instance equal to {@link java.util.Locale#US Locale.US}.
*
* @return An array of locales for which localized
* <code>DateFormatSymbols</code> instances are available.
* @since 1.6
*/
public static Locale[] getAvailableLocales() {
LocaleServiceProviderPool pool=
LocaleServiceProviderPool.getPool(DateFormatSymbolsProvider.class);
return pool.getAvailableLocales();
}
/**
* Gets the <code>DateFormatSymbols</code> instance for the default
* locale. This method provides access to <code>DateFormatSymbols</code>
* instances for locales supported by the Java runtime itself as well
* as for those supported by installed
* {@link java.text.spi.DateFormatSymbolsProvider DateFormatSymbolsProvider}
* implementations.
* <p>This is equivalent to calling {@link #getInstance(Locale)
* getInstance(Locale.getDefault(Locale.Category.FORMAT))}.
* @see java.util.Locale#getDefault(java.util.Locale.Category)
* @see java.util.Locale.Category#FORMAT
* @return a <code>DateFormatSymbols</code> instance.
* @since 1.6
*/
public static final DateFormatSymbols getInstance() {
return getInstance(Locale.getDefault(Locale.Category.FORMAT));
}
/**
* Gets the <code>DateFormatSymbols</code> instance for the specified
* locale. This method provides access to <code>DateFormatSymbols</code>
* instances for locales supported by the Java runtime itself as well
* as for those supported by installed
* {@link java.text.spi.DateFormatSymbolsProvider DateFormatSymbolsProvider}
* implementations.
* @param locale the given locale.
* @return a <code>DateFormatSymbols</code> instance.
* @exception NullPointerException if <code>locale</code> is null
* @since 1.6
*/
public static final DateFormatSymbols getInstance(Locale locale) {
DateFormatSymbols dfs = getProviderInstance(locale);
if (dfs != null) {
return dfs;
}
throw new RuntimeException("DateFormatSymbols instance creation failed.");
}
/**
* Returns a DateFormatSymbols provided by a provider or found in
* the cache. Note that this method returns a cached instance,
* not its clone. Therefore, the instance should never be given to
* an application.
*/
static final DateFormatSymbols getInstanceRef(Locale locale) {
DateFormatSymbols dfs = getProviderInstance(locale);
if (dfs != null) {
return dfs;
}
throw new RuntimeException("DateFormatSymbols instance creation failed.");
}
private static DateFormatSymbols getProviderInstance(Locale locale) {
LocaleProviderAdapter adapter = LocaleProviderAdapter.getAdapter(DateFormatSymbolsProvider.class, locale);
DateFormatSymbolsProvider provider = adapter.getDateFormatSymbolsProvider();
DateFormatSymbols dfsyms = provider.getInstance(locale);
if (dfsyms == null) {
provider = LocaleProviderAdapter.forJRE().getDateFormatSymbolsProvider();
dfsyms = provider.getInstance(locale);
}
return dfsyms;
}
/**
* Gets era strings. For example: "AD" and "BC".
* @return the era strings.
*/
public String[] getEras() {
return Arrays.copyOf(eras, eras.length);
}
/**
* Sets era strings. For example: "AD" and "BC".
* @param newEras the new era strings.
*/
public void setEras(String[] newEras) {
eras = Arrays.copyOf(newEras, newEras.length);
cachedHashCode = 0;
}
/**
* Gets month strings. For example: "January", "February", etc.
*
* <p>If the language requires different forms for formatting and
* stand-alone usages, this method returns month names in the
* formatting form. For example, the preferred month name for
* January in the Czech language is <em>ledna</em> in the
* formatting form, while it is <em>leden</em> in the stand-alone
* form. This method returns {@code "ledna"} in this case. Refer
* to the <a href="http://unicode.org/reports/tr35/#Calendar_Elements">
* Calendar Elements in the Unicode Locale Data Markup Language
* (LDML) specification</a> for more details.
*
* @return the month strings.
*/
public String[] getMonths() {
return Arrays.copyOf(months, months.length);
}
/**
* Sets month strings. For example: "January", "February", etc.
* @param newMonths the new month strings.
*/
public void setMonths(String[] newMonths) {
months = Arrays.copyOf(newMonths, newMonths.length);
cachedHashCode = 0;
}
/**
* Gets short month strings. For example: "Jan", "Feb", etc.
*
* <p>If the language requires different forms for formatting and
* stand-alone usages, This method returns short month names in
* the formatting form. For example, the preferred abbreviation
* for January in the Catalan language is <em>de gen.</em> in the
* formatting form, while it is <em>gen.</em> in the stand-alone
* form. This method returns {@code "de gen."} in this case. Refer
* to the <a href="http://unicode.org/reports/tr35/#Calendar_Elements">
* Calendar Elements in the Unicode Locale Data Markup Language
* (LDML) specification</a> for more details.
*
* @return the short month strings.
*/
public String[] getShortMonths() {
return Arrays.copyOf(shortMonths, shortMonths.length);
}
/**
* Sets short month strings. For example: "Jan", "Feb", etc.
* @param newShortMonths the new short month strings.
*/
public void setShortMonths(String[] newShortMonths) {
shortMonths = Arrays.copyOf(newShortMonths, newShortMonths.length);
cachedHashCode = 0;
}
/**
* Gets weekday strings. For example: "Sunday", "Monday", etc.
* @return the weekday strings. Use <code>Calendar.SUNDAY</code>,
* <code>Calendar.MONDAY</code>, etc. to index the result array.
*/
public String[] getWeekdays() {
return Arrays.copyOf(weekdays, weekdays.length);
}
/**
* Sets weekday strings. For example: "Sunday", "Monday", etc.
* @param newWeekdays the new weekday strings. The array should
* be indexed by <code>Calendar.SUNDAY</code>,
* <code>Calendar.MONDAY</code>, etc.
*/
public void setWeekdays(String[] newWeekdays) {
weekdays = Arrays.copyOf(newWeekdays, newWeekdays.length);
cachedHashCode = 0;
}
/**
* Gets short weekday strings. For example: "Sun", "Mon", etc.
* @return the short weekday strings. Use <code>Calendar.SUNDAY</code>,
* <code>Calendar.MONDAY</code>, etc. to index the result array.
*/
public String[] getShortWeekdays() {
return Arrays.copyOf(shortWeekdays, shortWeekdays.length);
}
/**
* Sets short weekday strings. For example: "Sun", "Mon", etc.
* @param newShortWeekdays the new short weekday strings. The array should
* be indexed by <code>Calendar.SUNDAY</code>,
* <code>Calendar.MONDAY</code>, etc.
*/
public void setShortWeekdays(String[] newShortWeekdays) {
shortWeekdays = Arrays.copyOf(newShortWeekdays, newShortWeekdays.length);
cachedHashCode = 0;
}
/**
* Gets ampm strings. For example: "AM" and "PM".
* @return the ampm strings.
*/
public String[] getAmPmStrings() {
return Arrays.copyOf(ampms, ampms.length);
}
/**
* Sets ampm strings. For example: "AM" and "PM".
* @param newAmpms the new ampm strings.
*/
public void setAmPmStrings(String[] newAmpms) {
ampms = Arrays.copyOf(newAmpms, newAmpms.length);
cachedHashCode = 0;
}
/**
* Gets time zone strings. Use of this method is discouraged; use
* {@link java.util.TimeZone#getDisplayName() TimeZone.getDisplayName()}
* instead.
* <p>
* The value returned is a
* two-dimensional array of strings of size <em>n</em> by <em>m</em>,
* where <em>m</em> is at least 5. Each of the <em>n</em> rows is an
* entry containing the localized names for a single <code>TimeZone</code>.
* Each such row contains (with <code>i</code> ranging from
* 0..<em>n</em>-1):
* <ul>
* <li><code>zoneStrings[i][0]</code> - time zone ID</li>
* <li><code>zoneStrings[i][1]</code> - long name of zone in standard
* time</li>
* <li><code>zoneStrings[i][2]</code> - short name of zone in
* standard time</li>
* <li><code>zoneStrings[i][3]</code> - long name of zone in daylight
* saving time</li>
* <li><code>zoneStrings[i][4]</code> - short name of zone in daylight
* saving time</li>
* </ul>
* The zone ID is <em>not</em> localized; it's one of the valid IDs of
* the {@link java.util.TimeZone TimeZone} class that are not
* <a href="../util/TimeZone.html#CustomID">custom IDs</a>.
* All other entries are localized names. If a zone does not implement
* daylight saving time, the daylight saving time names should not be used.
* <p>
* If {@link #setZoneStrings(String[][]) setZoneStrings} has been called
* on this <code>DateFormatSymbols</code> instance, then the strings
* provided by that call are returned. Otherwise, the returned array
* contains names provided by the Java runtime and by installed
* {@link java.util.spi.TimeZoneNameProvider TimeZoneNameProvider}
* implementations.
*
* @return the time zone strings.
* @see #setZoneStrings(String[][])
*/
public String[][] getZoneStrings() {
return getZoneStringsImpl(true);
}
/**
* Sets time zone strings. The argument must be a
* two-dimensional array of strings of size <em>n</em> by <em>m</em>,
* where <em>m</em> is at least 5. Each of the <em>n</em> rows is an
* entry containing the localized names for a single <code>TimeZone</code>.
* Each such row contains (with <code>i</code> ranging from
* 0..<em>n</em>-1):
* <ul>
* <li><code>zoneStrings[i][0]</code> - time zone ID</li>
* <li><code>zoneStrings[i][1]</code> - long name of zone in standard
* time</li>
* <li><code>zoneStrings[i][2]</code> - short name of zone in
* standard time</li>
* <li><code>zoneStrings[i][3]</code> - long name of zone in daylight
* saving time</li>
* <li><code>zoneStrings[i][4]</code> - short name of zone in daylight
* saving time</li>
* </ul>
* The zone ID is <em>not</em> localized; it's one of the valid IDs of
* the {@link java.util.TimeZone TimeZone} class that are not
* <a href="../util/TimeZone.html#CustomID">custom IDs</a>.
* All other entries are localized names.
*
* @param newZoneStrings the new time zone strings.
* @exception IllegalArgumentException if the length of any row in
* <code>newZoneStrings</code> is less than 5
* @exception NullPointerException if <code>newZoneStrings</code> is null
* @see #getZoneStrings()
*/
public void setZoneStrings(String[][] newZoneStrings) {
String[][] aCopy = new String[newZoneStrings.length][];
for (int i = 0; i < newZoneStrings.length; ++i) {
int len = newZoneStrings[i].length;
if (len < 5) {
throw new IllegalArgumentException();
}
aCopy[i] = Arrays.copyOf(newZoneStrings[i], len);
}
zoneStrings = aCopy;
isZoneStringsSet = true;
cachedHashCode = 0;
}
/**
* Gets localized date-time pattern characters. For example: 'u', 't', etc.
* @return the localized date-time pattern characters.
*/
public String getLocalPatternChars() {
return localPatternChars;
}
/**
* Sets localized date-time pattern characters. For example: 'u', 't', etc.
* @param newLocalPatternChars the new localized date-time
* pattern characters.
*/
public void setLocalPatternChars(String newLocalPatternChars) {
// Call toString() to throw an NPE in case the argument is null
localPatternChars = newLocalPatternChars.toString();
cachedHashCode = 0;
}
/**
* Overrides Cloneable
*/
public Object clone()
{
try
{
DateFormatSymbols other = (DateFormatSymbols)super.clone();
copyMembers(this, other);
return other;
} catch (CloneNotSupportedException e) {
throw new InternalError(e);
}
}
/**
* Override hashCode.
* Generates a hash code for the DateFormatSymbols object.
*/
@Override
public int hashCode() {
int hashCode = cachedHashCode;
if (hashCode == 0) {
hashCode = 5;
hashCode = 11 * hashCode + Arrays.hashCode(eras);
hashCode = 11 * hashCode + Arrays.hashCode(months);
hashCode = 11 * hashCode + Arrays.hashCode(shortMonths);
hashCode = 11 * hashCode + Arrays.hashCode(weekdays);
hashCode = 11 * hashCode + Arrays.hashCode(shortWeekdays);
hashCode = 11 * hashCode + Arrays.hashCode(ampms);
hashCode = 11 * hashCode + Arrays.deepHashCode(getZoneStringsWrapper());
hashCode = 11 * hashCode + Objects.hashCode(localPatternChars);
cachedHashCode = hashCode;
}
return hashCode;
}
/**
* Override equals
*/
public boolean equals(Object obj)
{
if (this == obj) return true;
if (obj == null || getClass() != obj.getClass()) return false;
DateFormatSymbols that = (DateFormatSymbols) obj;
return (Arrays.equals(eras, that.eras)
&& Arrays.equals(months, that.months)
&& Arrays.equals(shortMonths, that.shortMonths)
&& Arrays.equals(weekdays, that.weekdays)
&& Arrays.equals(shortWeekdays, that.shortWeekdays)
&& Arrays.equals(ampms, that.ampms)
&& Arrays.deepEquals(getZoneStringsWrapper(), that.getZoneStringsWrapper())
&& ((localPatternChars != null
&& localPatternChars.equals(that.localPatternChars))
|| (localPatternChars == null
&& that.localPatternChars == null)));
}
// =======================privates===============================
/**
* Useful constant for defining time zone offsets.
*/
static final int millisPerHour = 60*60*1000;
/**
* Cache to hold DateFormatSymbols instances per Locale.
*/
private static final ConcurrentMap<Locale, SoftReference<DateFormatSymbols>> cachedInstances
= new ConcurrentHashMap<>(3);
private transient int lastZoneIndex = 0;
/**
* Cached hash code
*/
transient volatile int cachedHashCode = 0;
private void initializeData(Locale desiredLocale) {
locale = desiredLocale;
// Copy values of a cached instance if any.
SoftReference<DateFormatSymbols> ref = cachedInstances.get(locale);
DateFormatSymbols dfs;
if (ref != null && (dfs = ref.get()) != null) {
copyMembers(dfs, this);
return;
}
// Initialize the fields from the ResourceBundle for locale.
LocaleProviderAdapter adapter = LocaleProviderAdapter.getAdapter(DateFormatSymbolsProvider.class, locale);
// Avoid any potential recursions
if (!(adapter instanceof ResourceBundleBasedAdapter)) {
adapter = LocaleProviderAdapter.getResourceBundleBased();
}
ResourceBundle resource = ((ResourceBundleBasedAdapter)adapter).getLocaleData().getDateFormatData(locale);
// JRE and CLDR use different keys
// JRE: Eras, short.Eras and narrow.Eras
// CLDR: long.Eras, Eras and narrow.Eras
if (resource.containsKey("Eras")) {
eras = resource.getStringArray("Eras");
} else if (resource.containsKey("long.Eras")) {
eras = resource.getStringArray("long.Eras");
} else if (resource.containsKey("short.Eras")) {
eras = resource.getStringArray("short.Eras");
}
months = resource.getStringArray("MonthNames");
shortMonths = resource.getStringArray("MonthAbbreviations");
ampms = resource.getStringArray("AmPmMarkers");
localPatternChars = resource.getString("DateTimePatternChars");
// Day of week names are stored in a 1-based array.
weekdays = toOneBasedArray(resource.getStringArray("DayNames"));
shortWeekdays = toOneBasedArray(resource.getStringArray("DayAbbreviations"));
// Put a clone in the cache
ref = new SoftReference<>((DateFormatSymbols)this.clone());
SoftReference<DateFormatSymbols> x = cachedInstances.putIfAbsent(locale, ref);
if (x != null) {
DateFormatSymbols y = x.get();
if (y == null) {
// Replace the empty SoftReference with ref.
cachedInstances.put(locale, ref);
}
}
}
private static String[] toOneBasedArray(String[] src) {
int len = src.length;
String[] dst = new String[len + 1];
dst[0] = "";
for (int i = 0; i < len; i++) {
dst[i + 1] = src[i];
}
return dst;
}
/**
* Package private: used by SimpleDateFormat
* Gets the index for the given time zone ID to obtain the time zone
* strings for formatting. The time zone ID is just for programmatic
* lookup. NOT LOCALIZED!!!
* @param ID the given time zone ID.
* @return the index of the given time zone ID. Returns -1 if
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