/*

  * Copyright (c) 1996, 2010, 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.List;

 import java.util.Locale;

 import java.util.ResourceBundle;

 import java.util.TimeZone;

 import java.util.concurrent.ConcurrentHashMap;

 import java.util.concurrent.ConcurrentMap;

 import java.util.spi.LocaleServiceProvider;

 import sun.util.LocaleServiceProviderPool;

 import sun.util.TimeZoneNameUtility;

 import sun.util.calendar.ZoneInfo;

 import sun.util.resources.LocaleData;

 /**

  * <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>DateFormat</code> and <code>SimpleDateFormat</code> both use

  * <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 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.

      *

      * @see #getInstance()

      * @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.

      *

      * @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 = "GyMdkHmsSEDFwWahKzZYuX";

     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

     /**

      * 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.

      * @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;

         }

         return (DateFormatSymbols) getCachedInstance(locale).clone();

     }

     /**

      * 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;

         }

         return getCachedInstance(locale);

     }

     private static DateFormatSymbols getProviderInstance(Locale locale) {

         DateFormatSymbols providersInstance = null;

         // Check whether a provider can provide an implementation that's closer

         // to the requested locale than what the Java runtime itself can provide.

         LocaleServiceProviderPool pool =

             LocaleServiceProviderPool.getPool(DateFormatSymbolsProvider.class);

         if (pool.hasProviders()) {

             providersInstance = pool.getLocalizedObject(

                                     DateFormatSymbolsGetter.INSTANCE, locale);

         }

         return providersInstance;

     }

     /**

      * Returns a cached DateFormatSymbols if it's found in the

      * cache. Otherwise, this method returns a newly cached instance

      * for the given locale.

      */

     private static DateFormatSymbols getCachedInstance(Locale locale) {

         SoftReference<DateFormatSymbols> ref = cachedInstances.get(locale);

         DateFormatSymbols dfs = null;

         if (ref == null || (dfs = ref.get()) == null) {

             dfs = new DateFormatSymbols(locale);

             ref = new SoftReference<DateFormatSymbols>(dfs);

             SoftReference<DateFormatSymbols> x = cachedInstances.putIfAbsent(locale, ref);

             if (x != null) {

                 DateFormatSymbols y = x.get();

                 if (y != null) {

                     dfs = y;

                 } else {

                     // Replace the empty SoftReference with ref.

                     cachedInstances.put(locale, ref);

                 }

             }

         }

         return dfs;

     }

     /**

      * 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);

     }

     /**

      * Gets month strings. For example: "January", "February", etc.

      * @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);

     }

     /**

      * Gets short month strings. For example: "Jan", "Feb", etc.

      * @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);

     }

     /**

      * 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);

     }

     /**

      * 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);

     }

     /**

      * 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);

     }

     /**

      * 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;

     }

     /**

      * 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();

     }

     /**

      * Overrides Cloneable

      */

     public Object clone()

     {

         try

         {

             DateFormatSymbols other = (DateFormatSymbols)super.clone();

             copyMembers(this, other);

             return other;

         } catch (CloneNotSupportedException e) {

             throw new InternalError();

         }

     }

     /**

      * Override hashCode.

      * Generates a hash code for the DateFormatSymbols object.

      */

     public int hashCode() {

         int hashcode = 0;

         String[][] zoneStrings = getZoneStringsWrapper();

         for (int index = 0; index < zoneStrings[0].length; ++index)

             hashcode ^= zoneStrings[0][index].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<Locale, SoftReference<DateFormatSymbols>>(3);

     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.

         ResourceBundle resource = LocaleData.getDateFormatData(locale);

         eras = resource.getStringArray("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"));

     }

     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();

         for (int index=0; index<zoneStrings.length; index++)

         {

             if (ID.equals(zoneStrings[index][0])) 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 final 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 final boolean isSubclassObject() {

         return !getClass().getName().equals("java.text.DateFormatSymbols");

     }

     /**

      * Clones all the data members from the source DateFormatSymbols to

      * the target DateFormatSymbols. This is only for subclasses.

      * @param src the source DateFormatSymbols.

      * @param dst the target DateFormatSymbols.

      */

     private final void copyMembers(DateFormatSymbols src, DateFormatSymbols dst)

     {

         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;

     }

     /**

      * 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();

     }

     /**

      * Obtains a DateFormatSymbols instance from a DateFormatSymbolsProvider

      * implementation.

      */

     private static class DateFormatSymbolsGetter

         implements LocaleServiceProviderPool.LocalizedObjectGetter<DateFormatSymbolsProvider,

                                                                    DateFormatSymbols> {

         private static final DateFormatSymbolsGetter INSTANCE =

             new DateFormatSymbolsGetter();

         public DateFormatSymbols getObject(DateFormatSymbolsProvider dateFormatSymbolsProvider,

                                 Locale locale,

                                 String key,

                                 Object... params) {

             assert params.length == 0;

             return dateFormatSymbolsProvider.getInstance(locale);

         }

     }

 }