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/*
 * 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.util.Arrays;
import java.util.Locale;
import java.util.ResourceBundle;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

/**
 * 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.
 * DateFormat and SimpleDateFormat both use
 * DateFormatSymbols to encapsulate this information.
 *
 * 
 * Typically you shouldn't use DateFormatSymbols directly.
 * Rather, you are encouraged to create a date-time formatter with the
 * DateFormat class's factory methods: getTimeInstance,
 * getDateInstance, or getDateTimeInstance.
 * These methods automatically create a DateFormatSymbols for
 * the formatter so that you don't have to. After the
 * formatter is created, you may modify its format pattern using the
 * setPattern method. For more information about
 * creating formatters using DateFormat's factory methods,
 * see {@link DateFormat}.
 *
 * 

 * If you decide to create a date-time formatter with a specific
 * format pattern for a specific locale, you can do so with:
 * 

 *  * new SimpleDateFormat(aPattern, DateFormatSymbols.getInstance(aLocale)).
 * 
 * 
 *
 * 
 * DateFormatSymbols objects are cloneable. When you obtain
 * a 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.
 *
 * 

 * New DateFormatSymbols subclasses may be added to support
 * SimpleDateFormat 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 Calendar.BC and 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
     * Calendar.JANUARY, 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
     * Calendar.JANUARY, Calendar.FEBRUARY, etc.

     * @serial
     */
    String shortMonths[] = null;

    /**
     * Weekday strings. For example: "Sunday", "Monday", etc.  An array
     * of 8 strings, indexed by Calendar.SUNDAY,
     * Calendar.MONDAY, etc.
     * The element weekdays[0] is ignored.
     * @serial
     */
    String weekdays[] = null;

    /**
     * Short weekday strings. For example: "Sun", "Mon", etc.  An array
     * of 8 strings, indexed by Calendar.SUNDAY,
     * Calendar.MONDAY, etc.
     * The element shortWeekdays[0] is ignored.
     * @serial
     */
    String shortWeekdays[] = null;

    /**
     * AM and PM strings. For example: "AM" and "PM".  An array of
     * 2 strings, indexed by Calendar.AM and
     * Calendar.PM.
     * @serial
     */
    String ampms[] = null;

    /**
     * Localized names of time zones in this locale.  This is a
     * two-dimensional array of strings of size n by m,
     * where m is at least 5.  Each of the n rows is an
     * entry containing the localized names for a single TimeZone.
     * Each such row contains (with i ranging from
     * 0..n-1):
     * 

     * zoneStrings[i][0] - time zone ID
     * zoneStrings[i][1] - long name of zone in standard
     * time
     * zoneStrings[i][2] - short name of zone in
     * standard time
     * zoneStrings[i][3] - long name of zone in daylight
     * saving time
     * zoneStrings[i][4] - short name of zone in daylight
     * saving time
     * 
     * The zone ID is not localized; it's one of the valid IDs of
     * the {@link java.util.TimeZone TimeZone} class that are not
     * custom IDs.
     * 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 DateFormat.ERA_FIELD,
     * 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 */
    static final long serialVersionUID = -5987973545549424702L;

    /**
     * Returns an array of all locales for which the
     * 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 Locale
     * instance equal to {@link java.util.Locale#US Locale.US}.
     *
     * @return An array of locales for which localized
     *         DateFormatSymbols instances are available.
     * @since 1.6
     */
    public static Locale[] getAvailableLocales() {
        return new Locale[] { Locale.US };
//        LocaleServiceProviderPool pool=
//            LocaleServiceProviderPool.getPool(DateFormatSymbolsProvider.class);
//        return pool.getAvailableLocales();
    }

    /**
     * Gets the DateFormatSymbols instance for the default
     * locale.  This method provides access to 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.
     * @return a DateFormatSymbols instance.
     * @since 1.6
     */
    public static final DateFormatSymbols getInstance() {
        return getInstance(Locale.getDefault(Locale.Category.FORMAT));
    }

    /**
     * Gets the DateFormatSymbols instance for the specified
     * locale.  This method provides access to 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 DateFormatSymbols instance.
     * @exception NullPointerException if locale 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 ref = cachedInstances.get(locale);
        DateFormatSymbols dfs = null;
        if (ref == null || (dfs = ref.get()) == null) {
            dfs = new DateFormatSymbols(locale);
            ref = new SoftReference(dfs);
            SoftReference 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 Calendar.SUNDAY,
     * 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 Calendar.SUNDAY,
     * Calendar.MONDAY, 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 Calendar.SUNDAY,
     * 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 Calendar.SUNDAY,
     * Calendar.MONDAY, 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.
     * 
     * The value returned is a
     * two-dimensional array of strings of size n by m,
     * where m is at least 5.  Each of the n rows is an
     * entry containing the localized names for a single TimeZone.
     * Each such row contains (with i ranging from
     * 0..n-1):
     * 

     * zoneStrings[i][0] - time zone ID
     * zoneStrings[i][1] - long name of zone in standard
     * time
     * zoneStrings[i][2] - short name of zone in
     * standard time
     * zoneStrings[i][3] - long name of zone in daylight
     * saving time
     * zoneStrings[i][4] - short name of zone in daylight
     * saving time
     * 
     * The zone ID is not localized; it's one of the valid IDs of
     * the {@link java.util.TimeZone TimeZone} class that are not
     * custom IDs.
     * All other entries are localized names.  If a zone does not implement
     * daylight saving time, the daylight saving time names should not be used.
     * 
     * If {@link #setZoneStrings(String[][]) setZoneStrings} has been called
     * on this DateFormatSymbols 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 n by m,
     * where m is at least 5.  Each of the n rows is an
     * entry containing the localized names for a single TimeZone.
     * Each such row contains (with i ranging from
     * 0..n-1):
     * 

     * zoneStrings[i][0] - time zone ID
     * zoneStrings[i][1] - long name of zone in standard
     * time
     * zoneStrings[i][2] - short name of zone in
     * standard time
     * zoneStrings[i][3] - long name of zone in daylight
     * saving time
     * zoneStrings[i][4] - short name of zone in daylight
     * saving time
     * 
     * The zone ID is not localized; it's one of the valid IDs of
     * the {@link java.util.TimeZone TimeZone} class that are not
     * custom IDs.
     * All other entries are localized names.
     *
     * @param newZoneStrings the new time zone strings.
     * @exception IllegalArgumentException if the length of any row in
     *    newZoneStrings is less than 5
     * @exception NullPointerException if newZoneStrings 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> cachedInstances
        = new ConcurrentHashMap>(3);

    private void initializeData(Locale desiredLocale) {
        locale = desiredLocale;

        // Copy values of a cached instance if any.
        SoftReference 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; indexzoneStrings 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 {
        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);
        }
    }
     */
}