/*

 * Copyright (c) 1996, 2019, 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

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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.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} 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} uses

 * {@code DateFormatSymbols} to encapsulate this information.

 *

 * <p>

 * Typically you shouldn't use {@code DateFormatSymbols} directly.

 * Rather, you are encouraged to create a date-time formatter with the

 * {@code DateFormat} class's factory methods: {@code getTimeInstance},

 * {@code getDateInstance}, or {@code getDateTimeInstance}.

 * These methods automatically create a {@code DateFormatSymbols} 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} method. For more information about

 * creating formatters using {@code DateFormat}'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} objects are cloneable. When you obtain

 * a {@code DateFormatSymbols} 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} subclasses may be added to support

 * {@code SimpleDateFormat} 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

     * @throws     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)

     * @throws     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} and {@code Calendar.AD}.

     * @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 Calendar.FEBRUARY}, 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 Calendar.FEBRUARY}, etc.

     * @serial

     */

    String shortMonths[] = null;

    /**

     * Weekday strings. For example: "Sunday", "Monday", etc.  An array

     * of 8 strings, indexed by {@code Calendar.SUNDAY},

     * {@code Calendar.MONDAY}, etc.

     * The element {@code weekdays[0]} 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 Calendar.MONDAY}, etc.

     * The element {@code shortWeekdays[0]} 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} and

     * {@code Calendar.PM}.

     * @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}.

     * Each such row contains (with {@code i} ranging from

     * 0..<em>n</em>-1):

     * <ul>

     * <li>{@code zoneStrings[i][0]} - time zone ID</li>

     * <li>{@code zoneStrings[i][1]} - long name of zone in standard

     * time</li>

     * <li>{@code zoneStrings[i][2]} - short name of zone in

     * standard time</li>

     * <li>{@code zoneStrings[i][3]} - long name of zone in daylight

     * saving time</li>

     * <li>{@code zoneStrings[i][4]} - 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 DateFormat.YEAR_FIELD}, 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 */

    @java.io.Serial

    static final long serialVersionUID = -5987973545549424702L;

    /**

     * Returns an array of all locales for which the

     * {@code getInstance} 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}

     * instance equal to {@link java.util.Locale#US Locale.US}.

     *

     * @return An array of locales for which localized

     *         {@code DateFormatSymbols} instances are available.

     * @since 1.6

     */

    public static Locale[] getAvailableLocales() {

        LocaleServiceProviderPool pool=

            LocaleServiceProviderPool.getPool(DateFormatSymbolsProvider.class);

        return pool.getAvailableLocales();

    }

    /**

     * Gets the {@code DateFormatSymbols} instance for the default

     * locale.  This method provides access to {@code DateFormatSymbols}

     * 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} instance.

     * @since 1.6

     */

    public static final DateFormatSymbols getInstance() {

        return getInstance(Locale.getDefault(Locale.Category.FORMAT));

    }

    /**

     * Gets the {@code DateFormatSymbols} instance for the specified

     * locale.  This method provides access to {@code DateFormatSymbols}

     * 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} instance.

     * @throws    NullPointerException if {@code locale} 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.