Java tutorial
/* * Copyright (c) 1996, 2018, 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. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ /* * (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.concurrent.ConcurrentHashMap; import java.util.concurrent.ConcurrentMap; import sun.util.locale.provider.CalendarDataUtility; 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>If the locale contains "rg" (region override) * <a href="../util/Locale.html#def_locale_extension">Unicode extension</a>, * the symbols are overridden for the designated region. * * <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 * @since 1.1 */ 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); } /** * Constructs an uninitialized DateFormatSymbols. */ private DateFormatSymbols(boolean flag) { } /** * 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="../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. * An array with either 12 or 13 elements will be returned depending * on whether or not {@link java.util.Calendar#UNDECIMBER Calendar.UNDECIMBER} * is supported. Use * {@link java.util.Calendar#JANUARY Calendar.JANUARY}, * {@link java.util.Calendar#FEBRUARY Calendar.FEBRUARY}, * etc. to index the result array. * * <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. * * @implSpec This method returns 13 elements since * {@link java.util.Calendar#UNDECIMBER Calendar.UNDECIMBER} is supported. * @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. The array should * be indexed by {@link java.util.Calendar#JANUARY Calendar.JANUARY}, * {@link java.util.Calendar#FEBRUARY Calendar.FEBRUARY}, etc. */ public void setMonths(String[] newMonths) { months = Arrays.copyOf(newMonths, newMonths.length); cachedHashCode = 0; } /** * Gets short month strings. For example: "Jan", "Feb", etc. * An array with either 12 or 13 elements will be returned depending * on whether or not {@link java.util.Calendar#UNDECIMBER Calendar.UNDECIMBER} * is supported. Use * {@link java.util.Calendar#JANUARY Calendar.JANUARY}, * {@link java.util.Calendar#FEBRUARY Calendar.FEBRUARY}, * etc. to index the result array. * * <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. * * @implSpec This method returns 13 elements since * {@link java.util.Calendar#UNDECIMBER Calendar.UNDECIMBER} is supported. * @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. The array should * be indexed by {@link java.util.Calendar#JANUARY Calendar.JANUARY}, * {@link java.util.Calendar#FEBRUARY Calendar.FEBRUARY}, etc. */ 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 * {@link java.util.Calendar#SUNDAY Calendar.SUNDAY}, * {@link java.util.Calendar#MONDAY Calendar.MONDAY}, 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 {@link java.util.Calendar#SUNDAY Calendar.SUNDAY}, * {@link java.util.Calendar#MONDAY Calendar.MONDAY}, 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 * {@link java.util.Calendar#SUNDAY Calendar.SUNDAY}, * {@link java.util.Calendar#MONDAY Calendar.MONDAY}, 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 {@link java.util.Calendar#SUNDAY Calendar.SUNDAY}, * {@link java.util.Calendar#MONDAY Calendar.MONDAY}, 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); if (hashCode != 0) { 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; /** * Cached hash code */ transient volatile int cachedHashCode; /** * Initializes this DateFormatSymbols with the locale data. This method uses * a cached DateFormatSymbols instance for the given locale if available. If * there's no cached one, this method creates an uninitialized instance and * populates its fields from the resource bundle for the locale, and caches * the instance. Note: zoneStrings isn't initialized in this method. */ private void initializeData(Locale locale) { SoftReference<DateFormatSymbols> ref = cachedInstances.get(locale); DateFormatSymbols dfs; if (ref == null || (dfs = ref.get()) == null) { if (ref != null) { // Remove the empty SoftReference cachedInstances.remove(locale, ref); } dfs = new DateFormatSymbols(false); // check for region override Locale override = CalendarDataUtility.findRegionOverride(locale); // Initialize the fields from the ResourceBundle for locale. LocaleProviderAdapter adapter = LocaleProviderAdapter.getAdapter(DateFormatSymbolsProvider.class, override); // Avoid any potential recursions if (!(adapter instanceof ResourceBundleBasedAdapter)) { adapter = LocaleProviderAdapter.getResourceBundleBased(); } ResourceBundle resource = ((ResourceBundleBasedAdapter) adapter).getLocaleData() .getDateFormatData(override); dfs.locale = 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")) { dfs.eras = resource.getStringArray("Eras"); } else if (resource.containsKey("long.Eras")) { dfs.eras = resource.getStringArray("long.Eras"); } else if (resource.containsKey("short.Eras")) { dfs.eras = resource.getStringArray("short.Eras"); } dfs.months = resource.getStringArray("MonthNames"); dfs.shortMonths = resource.getStringArray("MonthAbbreviations"); dfs.ampms = resource.getStringArray("AmPmMarkers"); dfs.localPatternChars = resource.getString("DateTimePatternChars"); // Day of week names are stored in a 1-based array. dfs.weekdays = toOneBasedArray(resource.getStringArray("DayNames")); dfs.shortWeekdays = toOneBasedArray(resource.getStringArray("DayAbbreviations")); // Put dfs in the cache ref = new SoftReference<>(dfs); SoftReference<DateFormatSymbols> x = cachedInstances.putIfAbsent(locale, ref); if (x != null) { DateFormatSymbols y = x.get(); if (y == null) { // Replace the empty SoftReference with ref. cachedInstances.replace(locale, x, ref); } else { ref = x; dfs = y; } } } // Copy the field values from dfs to this instance. copyMembers(dfs, this); } 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 * the given time zone ID can't be located in the DateFormatSymbols object. * @see java.util.SimpleTimeZone */ final int getZoneIndex(String ID) { String[][] zoneStrings = getZoneStringsWrapper(); /* * getZoneIndex has been re-written for performance reasons. instead of * traversing the zoneStrings array every time, we cache the last used zone * index */ if (lastZoneIndex < zoneStrings.length && ID.equals(zoneStrings[lastZoneIndex][0])) { return lastZoneIndex; } /* slow path, search entire list */ for (int index = 0; index < zoneStrings.length; index++) { if (ID.equals(zoneStrings[index][0])) { lastZoneIndex = index; return index; } } return -1; } /** * Wrapper method to the getZoneStrings(), which is called from inside * the java.text package and not to mutate the returned arrays, so that * it does not need to create a defensive copy. */ final String[][] getZoneStringsWrapper() { if (isSubclassObject()) { return getZoneStrings(); } else { return getZoneStringsImpl(false); } } private String[][] getZoneStringsImpl(boolean needsCopy) { if (zoneStrings == null) { zoneStrings = TimeZoneNameUtility.getZoneStrings(locale); } if (!needsCopy) { return zoneStrings; } int len = zoneStrings.length; String[][] aCopy = new String[len][]; for (int i = 0; i < len; i++) { aCopy[i] = Arrays.copyOf(zoneStrings[i], zoneStrings[i].length); } return aCopy; } private boolean isSubclassObject() { return !getClass().getName().equals("java.text.DateFormatSymbols"); } /** * Clones all the data members from the source DateFormatSymbols to * the target DateFormatSymbols. * * @param src the source DateFormatSymbols. * @param dst the target DateFormatSymbols. */ private void copyMembers(DateFormatSymbols src, DateFormatSymbols dst) { dst.locale = src.locale; dst.eras = Arrays.copyOf(src.eras, src.eras.length); dst.months = Arrays.copyOf(src.months, src.months.length); dst.shortMonths = Arrays.copyOf(src.shortMonths, src.shortMonths.length); dst.weekdays = Arrays.copyOf(src.weekdays, src.weekdays.length); dst.shortWeekdays = Arrays.copyOf(src.shortWeekdays, src.shortWeekdays.length); dst.ampms = Arrays.copyOf(src.ampms, src.ampms.length); if (src.zoneStrings != null) { dst.zoneStrings = src.getZoneStringsImpl(true); } else { dst.zoneStrings = null; } dst.localPatternChars = src.localPatternChars; dst.cachedHashCode = 0; } /** * Write out the default serializable data, after ensuring the * <code>zoneStrings</code> field is initialized in order to make * sure the backward compatibility. * * @since 1.6 */ private void writeObject(ObjectOutputStream stream) throws IOException { if (zoneStrings == null) { zoneStrings = TimeZoneNameUtility.getZoneStrings(locale); } stream.defaultWriteObject(); } }