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	/*
	* Copyright (c) 2012, 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.
	*/

	package sun.util.cldr;

	import java.security.AccessController;
	import java.security.AccessControlException;
	import java.security.PrivilegedAction;
	import java.security.PrivilegedActionException;
	import java.security.PrivilegedExceptionAction;
	import java.text.spi.BreakIteratorProvider;
	import java.text.spi.CollatorProvider;
	import java.util.Arrays;
	import java.util.Collections;
	import java.util.HashSet;
	import java.util.List;
	import java.util.Locale;
	import java.util.Map;
	import java.util.Optional;
	import java.util.ServiceLoader;
	import java.util.ServiceConfigurationError;
	import java.util.Set;
	import java.util.StringTokenizer;
	import java.util.concurrent.ConcurrentHashMap;
	import java.util.spi.CalendarDataProvider;
	import java.util.spi.CalendarNameProvider;
	import java.util.spi.TimeZoneNameProvider;
	import sun.util.locale.provider.JRELocaleProviderAdapter;
	import sun.util.locale.provider.LocaleDataMetaInfo;
	import sun.util.locale.provider.LocaleProviderAdapter;

	/**
	* LocaleProviderAdapter implementation for the CLDR locale data.
	*
	* @author Masayoshi Okutsu
	* @author Naoto Sato
	*/
	public class CLDRLocaleProviderAdapter extends JRELocaleProviderAdapter {

	private static final CLDRBaseLocaleDataMetaInfo baseMetaInfo = new CLDRBaseLocaleDataMetaInfo();
	// Assumption: CLDR has only one non-Base module.
	private final LocaleDataMetaInfo nonBaseMetaInfo;

	// parent locales map
	private static volatile Map<Locale, Locale> parentLocalesMap;
	// language aliases map
	private static volatile Map<String,String> langAliasesMap;
	// cache to hold locale to locale mapping for language aliases.
	private static final Map<Locale, Locale> langAliasesCache;
	static {
	parentLocalesMap = new ConcurrentHashMap<>();
	langAliasesMap = new ConcurrentHashMap<>();
	langAliasesCache = new ConcurrentHashMap<>();
	// Assuming these locales do NOT have irregular parent locales.
	parentLocalesMap.put(Locale.ROOT, Locale.ROOT);
	parentLocalesMap.put(Locale.ENGLISH, Locale.ENGLISH);
	parentLocalesMap.put(Locale.US, Locale.US);
	}

	public CLDRLocaleProviderAdapter() {
	LocaleDataMetaInfo nbmi = null;

	try {
	nbmi = AccessController.doPrivileged(new PrivilegedExceptionAction<LocaleDataMetaInfo>() {
	@Override
	public LocaleDataMetaInfo run() {
	for (LocaleDataMetaInfo ldmi : ServiceLoader.loadInstalled(LocaleDataMetaInfo.class)) {
	if (ldmi.getType() == LocaleProviderAdapter.Type.CLDR) {
	return ldmi;
	}
	}
	return null;
	}
	});
	} catch (PrivilegedActionException pae) {
	throw new InternalError(pae.getCause());
	}

	nonBaseMetaInfo = nbmi;
	}

	/**
	* Returns the type of this LocaleProviderAdapter
	* @return the type of this
	*/
	@Override
	public LocaleProviderAdapter.Type getAdapterType() {
	return LocaleProviderAdapter.Type.CLDR;
	}

	@Override
	public BreakIteratorProvider getBreakIteratorProvider() {
	return null;
	}

	@Override
	public CalendarDataProvider getCalendarDataProvider() {
	if (calendarDataProvider == null) {
	CalendarDataProvider provider = AccessController.doPrivileged(
	(PrivilegedAction<CalendarDataProvider>) () ->
	new CLDRCalendarDataProviderImpl(
	getAdapterType(),
	getLanguageTagSet("CalendarData")));

	synchronized (this) {
	if (calendarDataProvider == null) {
	calendarDataProvider = provider;
	}
	}
	}
	return calendarDataProvider;
	}

	@Override
	public CalendarNameProvider getCalendarNameProvider() {
	if (calendarNameProvider == null) {
	CalendarNameProvider provider = AccessController.doPrivileged(
	(PrivilegedAction<CalendarNameProvider>) ()
	-> new CLDRCalendarNameProviderImpl(
	getAdapterType(),
	getLanguageTagSet("FormatData")));

	synchronized (this) {
	if (calendarNameProvider == null) {
	calendarNameProvider = provider;
	}
	}
	}
	return calendarNameProvider;
	}

	@Override
	public CollatorProvider getCollatorProvider() {
	return null;
	}

	@Override
	public TimeZoneNameProvider getTimeZoneNameProvider() {
	if (timeZoneNameProvider == null) {
	TimeZoneNameProvider provider = AccessController.doPrivileged(
	(PrivilegedAction<TimeZoneNameProvider>) () ->
	new CLDRTimeZoneNameProviderImpl(
	getAdapterType(),
	getLanguageTagSet("TimeZoneNames")));

	synchronized (this) {
	if (timeZoneNameProvider == null) {
	timeZoneNameProvider = provider;
	}
	}
	}
	return timeZoneNameProvider;
	}

	@Override
	public Locale[] getAvailableLocales() {
	Set<String> all = createLanguageTagSet("AvailableLocales");
	Locale[] locs = new Locale[all.size()];
	int index = 0;
	for (String tag : all) {
	locs[index++] = Locale.forLanguageTag(tag);
	}
	return locs;
	}

	private static Locale applyAliases(Locale loc) {
	if (langAliasesMap.isEmpty()) {
	langAliasesMap = baseMetaInfo.getLanguageAliasMap();
	}
	Locale locale = langAliasesCache.get(loc);
	if (locale == null) {
	String locTag = loc.toLanguageTag();
	Locale aliasLocale = langAliasesMap.containsKey(locTag)
	? Locale.forLanguageTag(langAliasesMap.get(locTag)) : loc;
	langAliasesCache.putIfAbsent(loc, aliasLocale);
	return aliasLocale;
	} else {
	return locale;
	}
	}

	@Override
	protected Set<String> createLanguageTagSet(String category) {
	// Assume all categories support the same set as AvailableLocales
	// in CLDR adapter.
	category = "AvailableLocales";

	// Directly call Base tags, as we know it's in the base module.
	String supportedLocaleString = baseMetaInfo.availableLanguageTags(category);
	String nonBaseTags = null;

	if (nonBaseMetaInfo != null) {
	nonBaseTags = nonBaseMetaInfo.availableLanguageTags(category);
	}
	if (nonBaseTags != null) {
	if (supportedLocaleString != null) {
	supportedLocaleString += " " + nonBaseTags;
	} else {
	supportedLocaleString = nonBaseTags;
	}
	}
	if (supportedLocaleString == null) {
	return Collections.emptySet();
	}
	Set<String> tagset = new HashSet<>();
	StringTokenizer tokens = new StringTokenizer(supportedLocaleString);
	while (tokens.hasMoreTokens()) {
	tagset.add(tokens.nextToken());
	}
	return tagset;
	}

	// Implementation of ResourceBundleBasedAdapter
	@Override
	public List<Locale> getCandidateLocales(String baseName, Locale locale) {
	List<Locale> candidates = super.getCandidateLocales(baseName, applyAliases(locale));
	return applyParentLocales(baseName, candidates);
	}

	private List<Locale> applyParentLocales(String baseName, List<Locale> candidates) {
	// check irregular parents
	for (int i = 0; i < candidates.size(); i++) {
	Locale l = candidates.get(i);
	if (!l.equals(Locale.ROOT)) {
	Locale p = getParentLocale(l);
	if (p != null &&
	!candidates.get(i+1).equals(p)) {
	List<Locale> applied = candidates.subList(0, i+1);
	applied.addAll(applyParentLocales(baseName, super.getCandidateLocales(baseName, p)));
	return applied;
	}
	}
	}

	return candidates;
	}

	private static Locale getParentLocale(Locale locale) {
	Locale parent = parentLocalesMap.get(locale);

	if (parent == null) {
	String tag = locale.toLanguageTag();
	for (Map.Entry<Locale, String[]> entry : baseMetaInfo.parentLocales().entrySet()) {
	if (Arrays.binarySearch(entry.getValue(), tag) >= 0) {
	parent = entry.getKey();
	break;
	}
	}
	if (parent == null) {
	parent = locale; // non existent marker
	}
	parentLocalesMap.putIfAbsent(locale, parent);
	}

	if (locale.equals(parent)) {
	// means no irregular parent.
	parent = null;
	}

	return parent;
	}

	/**
	* This method returns equivalent CLDR supported locale
	* for no, no-NO locales so that COMPAT locales do not precede
	* those locales during ResourceBundle search path, also if an alias exists for a locale,
	* it returns equivalent locale, e.g for zh_HK it returns zh_Hant-HK.
	*/
	private static Locale getEquivalentLoc(Locale locale) {
	switch (locale.toString()) {
	case "no":
	case "no_NO":
	return Locale.forLanguageTag("nb");
	}
	return applyAliases(locale);
	}

	@Override
	public boolean isSupportedProviderLocale(Locale locale, Set<String> langtags) {
	return Locale.ROOT.equals(locale)
	\|\| langtags.contains(locale.stripExtensions().toLanguageTag())
	\|\| langtags.contains(getEquivalentLoc(locale).toLanguageTag());
	}

	/**
	* Returns the canonical ID for the given ID
	*/
	public Optional<String> canonicalTZID(String id) {
	return Optional.ofNullable(baseMetaInfo.tzCanonicalIDs().get(id));
	}
	}

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