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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.
	*/

	/*
	* (C) Copyright Taligent, Inc. 1996, 1997 - All Rights Reserved
	* (C) Copyright IBM Corp. 1996 - 1998 - 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 sun.util.locale.provider;

	import java.lang.ref.ReferenceQueue;
	import java.lang.ref.SoftReference;
	import java.text.MessageFormat;
	import java.util.Calendar;
	import java.util.HashSet;
	import java.util.LinkedHashSet;
	import java.util.Locale;
	import java.util.Map;
	import java.util.Objects;
	import java.util.ResourceBundle;
	import java.util.Set;
	import java.util.TimeZone;
	import java.util.concurrent.ConcurrentHashMap;
	import java.util.concurrent.ConcurrentMap;
	import sun.security.action.GetPropertyAction;
	import sun.util.calendar.ZoneInfo;
	import sun.util.resources.LocaleData;
	import sun.util.resources.OpenListResourceBundle;
	import sun.util.resources.ParallelListResourceBundle;
	import sun.util.resources.TimeZoneNamesBundle;

	/**
	* Central accessor to locale-dependent resources for JRE/CLDR provider adapters.
	*
	* @author Masayoshi Okutsu
	* @author Naoto Sato
	*/
	public class LocaleResources {

	private final Locale locale;
	private final LocaleData localeData;
	private final LocaleProviderAdapter.Type type;

	// Resource cache
	private final ConcurrentMap<String, ResourceReference> cache = new ConcurrentHashMap<>();
	private final ReferenceQueue<Object> referenceQueue = new ReferenceQueue<>();

	// cache key prefixes
	private static final String BREAK_ITERATOR_INFO = "BII.";
	private static final String CALENDAR_DATA = "CALD.";
	private static final String COLLATION_DATA_CACHEKEY = "COLD";
	private static final String DECIMAL_FORMAT_SYMBOLS_DATA_CACHEKEY = "DFSD";
	private static final String CURRENCY_NAMES = "CN.";
	private static final String LOCALE_NAMES = "LN.";
	private static final String TIME_ZONE_NAMES = "TZN.";
	private static final String ZONE_IDS_CACHEKEY = "ZID";
	private static final String CALENDAR_NAMES = "CALN.";
	private static final String NUMBER_PATTERNS_CACHEKEY = "NP";
	private static final String DATE_TIME_PATTERN = "DTP.";

	// TimeZoneNamesBundle exemplar city prefix
	private static final String TZNB_EXCITY_PREFIX = "timezone.excity.";

	// null singleton cache value
	private static final Object NULLOBJECT = new Object();

	LocaleResources(ResourceBundleBasedAdapter adapter, Locale locale) {
	this.locale = locale;
	this.localeData = adapter.getLocaleData();
	type = ((LocaleProviderAdapter)adapter).getAdapterType();
	}

	private void removeEmptyReferences() {
	Object ref;
	while ((ref = referenceQueue.poll()) != null) {
	cache.remove(((ResourceReference)ref).getCacheKey());
	}
	}

	Object getBreakIteratorInfo(String key) {
	Object biInfo;
	String cacheKey = BREAK_ITERATOR_INFO + key;

	removeEmptyReferences();
	ResourceReference data = cache.get(cacheKey);
	if (data == null \|\| ((biInfo = data.get()) == null)) {
	biInfo = localeData.getBreakIteratorInfo(locale).getObject(key);
	cache.put(cacheKey, new ResourceReference(cacheKey, biInfo, referenceQueue));
	}

	return biInfo;
	}

	@SuppressWarnings("unchecked")
	byte[] getBreakIteratorResources(String key) {
	return (byte[]) localeData.getBreakIteratorResources(locale).getObject(key);
	}

	public String getCalendarData(String key) {
	String caldata = "";
	String cacheKey = CALENDAR_DATA + key;

	removeEmptyReferences();

	ResourceReference data = cache.get(cacheKey);
	if (data == null \|\| ((caldata = (String) data.get()) == null)) {
	ResourceBundle rb = localeData.getCalendarData(locale);
	if (rb.containsKey(key)) {
	caldata = rb.getString(key);
	}

	cache.put(cacheKey,
	new ResourceReference(cacheKey, caldata, referenceQueue));
	}

	return caldata;
	}

	public String getCollationData() {
	String key = "Rule";
	String coldata = "";

	removeEmptyReferences();
	ResourceReference data = cache.get(COLLATION_DATA_CACHEKEY);
	if (data == null \|\| ((coldata = (String) data.get()) == null)) {
	ResourceBundle rb = localeData.getCollationData(locale);
	if (rb.containsKey(key)) {
	coldata = rb.getString(key);
	}
	cache.put(COLLATION_DATA_CACHEKEY,
	new ResourceReference(COLLATION_DATA_CACHEKEY, (Object) coldata, referenceQueue));
	}

	return coldata;
	}

	public Object[] getDecimalFormatSymbolsData() {
	Object[] dfsdata;

	removeEmptyReferences();
	ResourceReference data = cache.get(DECIMAL_FORMAT_SYMBOLS_DATA_CACHEKEY);
	if (data == null \|\| ((dfsdata = (Object[]) data.get()) == null)) {
	// Note that only dfsdata[0] is prepared here in this method. Other
	// elements are provided by the caller, yet they are cached here.
	ResourceBundle rb = localeData.getNumberFormatData(locale);
	dfsdata = new Object[3];

	// NumberElements look up. First, try the Unicode extension
	String numElemKey;
	String numberType = locale.getUnicodeLocaleType("nu");
	if (numberType != null) {
	numElemKey = numberType + ".NumberElements";
	if (rb.containsKey(numElemKey)) {
	dfsdata[0] = rb.getStringArray(numElemKey);
	}
	}

	// Next, try DefaultNumberingSystem value
	if (dfsdata[0] == null && rb.containsKey("DefaultNumberingSystem")) {
	numElemKey = rb.getString("DefaultNumberingSystem") + ".NumberElements";
	if (rb.containsKey(numElemKey)) {
	dfsdata[0] = rb.getStringArray(numElemKey);
	}
	}

	// Last resort. No need to check the availability.
	// Just let it throw MissingResourceException when needed.
	if (dfsdata[0] == null) {
	dfsdata[0] = rb.getStringArray("NumberElements");
	}

	cache.put(DECIMAL_FORMAT_SYMBOLS_DATA_CACHEKEY,
	new ResourceReference(DECIMAL_FORMAT_SYMBOLS_DATA_CACHEKEY, (Object) dfsdata, referenceQueue));
	}

	return dfsdata;
	}

	public String getCurrencyName(String key) {
	Object currencyName = null;
	String cacheKey = CURRENCY_NAMES + key;

	removeEmptyReferences();
	ResourceReference data = cache.get(cacheKey);

	if (data != null && ((currencyName = data.get()) != null)) {
	if (currencyName.equals(NULLOBJECT)) {
	currencyName = null;
	}

	return (String) currencyName;
	}

	OpenListResourceBundle olrb = localeData.getCurrencyNames(locale);

	if (olrb.containsKey(key)) {
	currencyName = olrb.getObject(key);
	cache.put(cacheKey,
	new ResourceReference(cacheKey, currencyName, referenceQueue));
	}

	return (String) currencyName;
	}

	public String getLocaleName(String key) {
	Object localeName = null;
	String cacheKey = LOCALE_NAMES + key;

	removeEmptyReferences();
	ResourceReference data = cache.get(cacheKey);

	if (data != null && ((localeName = data.get()) != null)) {
	if (localeName.equals(NULLOBJECT)) {
	localeName = null;
	}

	return (String) localeName;
	}

	OpenListResourceBundle olrb = localeData.getLocaleNames(locale);

	if (olrb.containsKey(key)) {
	localeName = olrb.getObject(key);
	cache.put(cacheKey,
	new ResourceReference(cacheKey, localeName, referenceQueue));
	}

	return (String) localeName;
	}

	public Object getTimeZoneNames(String key) {
	Object val = null;
	String cacheKey = TIME_ZONE_NAMES + key;

	removeEmptyReferences();
	ResourceReference data = cache.get(cacheKey);

	if (Objects.isNull(data) \|\| Objects.isNull(val = data.get())) {
	TimeZoneNamesBundle tznb = localeData.getTimeZoneNames(locale);
	if (tznb.containsKey(key)) {
	if (key.startsWith(TZNB_EXCITY_PREFIX)) {
	val = tznb.getString(key);
	assert val instanceof String;
	trace("tznb: %s key: %s, val: %s\n", tznb, key, val);
	} else {
	String[] names = tznb.getStringArray(key);
	trace("tznb: %s key: %s, names: %s, %s, %s, %s, %s, %s, %s\n", tznb, key,
	names[0], names[1], names[2], names[3], names[4], names[5], names[6]);
	val = names;
	}
	cache.put(cacheKey,
	new ResourceReference(cacheKey, val, referenceQueue));
	}
	}

	return val;
	}

	@SuppressWarnings("unchecked")
	Set<String> getZoneIDs() {
	Set<String> zoneIDs = null;

	removeEmptyReferences();
	ResourceReference data = cache.get(ZONE_IDS_CACHEKEY);
	if (data == null \|\| ((zoneIDs = (Set<String>) data.get()) == null)) {
	TimeZoneNamesBundle rb = localeData.getTimeZoneNames(locale);
	zoneIDs = rb.keySet();
	cache.put(ZONE_IDS_CACHEKEY,
	new ResourceReference(ZONE_IDS_CACHEKEY, (Object) zoneIDs, referenceQueue));
	}

	return zoneIDs;
	}

	// zoneStrings are cached separately in TimeZoneNameUtility.
	String[][] getZoneStrings() {
	TimeZoneNamesBundle rb = localeData.getTimeZoneNames(locale);
	Set<String> keyset = getZoneIDs();
	// Use a LinkedHashSet to preseve the order
	Set<String[]> value = new LinkedHashSet<>();
	Set<String> tzIds = new HashSet<>(Set.of(TimeZone.getAvailableIDs()));
	for (String key : keyset) {
	if (!key.startsWith(TZNB_EXCITY_PREFIX)) {
	value.add(rb.getStringArray(key));
	tzIds.remove(key);
	}
	}

	if (type == LocaleProviderAdapter.Type.CLDR) {
	// Add aliases data for CLDR
	Map<String, String> aliases = ZoneInfo.getAliasTable();
	// Note: TimeZoneNamesBundle creates a String[] on each getStringArray call.

	// Add timezones which are not present in this keyset,
	// so that their fallback names will be generated at runtime.
	tzIds.stream().filter(i -> (!i.startsWith("Etc/GMT")
	&& !i.startsWith("GMT")
	&& !i.startsWith("SystemV")))
	.forEach(tzid -> {
	String[] val = new String[7];
	if (keyset.contains(tzid)) {
	val = rb.getStringArray(tzid);
	} else {
	String tz = aliases.get(tzid);
	if (keyset.contains(tz)) {
	val = rb.getStringArray(tz);
	}
	}
	val[0] = tzid;
	value.add(val);
	});
	}
	return value.toArray(new String[0][]);
	}

	String[] getCalendarNames(String key) {
	String[] names = null;
	String cacheKey = CALENDAR_NAMES + key;

	removeEmptyReferences();
	ResourceReference data = cache.get(cacheKey);

	if (data == null \|\| ((names = (String[]) data.get()) == null)) {
	ResourceBundle rb = localeData.getDateFormatData(locale);
	if (rb.containsKey(key)) {
	names = rb.getStringArray(key);
	cache.put(cacheKey,
	new ResourceReference(cacheKey, (Object) names, referenceQueue));
	}
	}

	return names;
	}

	String[] getJavaTimeNames(String key) {
	String[] names = null;
	String cacheKey = CALENDAR_NAMES + key;

	removeEmptyReferences();
	ResourceReference data = cache.get(cacheKey);

	if (data == null \|\| ((names = (String[]) data.get()) == null)) {
	ResourceBundle rb = getJavaTimeFormatData();
	if (rb.containsKey(key)) {
	names = rb.getStringArray(key);
	cache.put(cacheKey,
	new ResourceReference(cacheKey, (Object) names, referenceQueue));
	}
	}

	return names;
	}

	public String getDateTimePattern(int timeStyle, int dateStyle, Calendar cal) {
	if (cal == null) {
	cal = Calendar.getInstance(locale);
	}
	return getDateTimePattern(null, timeStyle, dateStyle, cal.getCalendarType());
	}

	/**
	* Returns a date-time format pattern
	* @param timeStyle style of time; one of FULL, LONG, MEDIUM, SHORT in DateFormat,
	* or -1 if not required
	* @param dateStyle style of time; one of FULL, LONG, MEDIUM, SHORT in DateFormat,
	* or -1 if not required
	* @param calType the calendar type for the pattern
	* @return the pattern string
	*/
	public String getJavaTimeDateTimePattern(int timeStyle, int dateStyle, String calType) {
	calType = CalendarDataUtility.normalizeCalendarType(calType);
	String pattern;
	pattern = getDateTimePattern("java.time.", timeStyle, dateStyle, calType);
	if (pattern == null) {
	pattern = getDateTimePattern(null, timeStyle, dateStyle, calType);
	}
	return pattern;
	}

	private String getDateTimePattern(String prefix, int timeStyle, int dateStyle, String calType) {
	String pattern;
	String timePattern = null;
	String datePattern = null;

	if (timeStyle >= 0) {
	if (prefix != null) {
	timePattern = getDateTimePattern(prefix, "TimePatterns", timeStyle, calType);
	}
	if (timePattern == null) {
	timePattern = getDateTimePattern(null, "TimePatterns", timeStyle, calType);
	}
	}
	if (dateStyle >= 0) {
	if (prefix != null) {
	datePattern = getDateTimePattern(prefix, "DatePatterns", dateStyle, calType);
	}
	if (datePattern == null) {
	datePattern = getDateTimePattern(null, "DatePatterns", dateStyle, calType);
	}
	}
	if (timeStyle >= 0) {
	if (dateStyle >= 0) {
	String dateTimePattern = null;
	int dateTimeStyle = Math.max(dateStyle, timeStyle);
	if (prefix != null) {
	dateTimePattern = getDateTimePattern(prefix, "DateTimePatterns", dateTimeStyle, calType);
	}
	if (dateTimePattern == null) {
	dateTimePattern = getDateTimePattern(null, "DateTimePatterns", dateTimeStyle, calType);
	}
	switch (dateTimePattern) {
	case "{1} {0}":
	pattern = datePattern + " " + timePattern;
	break;
	case "{0} {1}":
	pattern = timePattern + " " + datePattern;
	break;
	default:
	pattern = MessageFormat.format(dateTimePattern.replaceAll("'", "''"), timePattern, datePattern);
	break;
	}
	} else {
	pattern = timePattern;
	}
	} else if (dateStyle >= 0) {
	pattern = datePattern;
	} else {
	throw new IllegalArgumentException("No date or time style specified");
	}
	return pattern;
	}

	public String[] getNumberPatterns() {
	String[] numberPatterns = null;

	removeEmptyReferences();
	ResourceReference data = cache.get(NUMBER_PATTERNS_CACHEKEY);

	if (data == null \|\| ((numberPatterns = (String[]) data.get()) == null)) {
	ResourceBundle resource = localeData.getNumberFormatData(locale);
	numberPatterns = resource.getStringArray("NumberPatterns");
	cache.put(NUMBER_PATTERNS_CACHEKEY,
	new ResourceReference(NUMBER_PATTERNS_CACHEKEY, (Object) numberPatterns, referenceQueue));
	}

	return numberPatterns;
	}

	/**
	* Returns the FormatData resource bundle of this LocaleResources.
	* The FormatData should be used only for accessing extra
	* resources required by JSR 310.
	*/
	public ResourceBundle getJavaTimeFormatData() {
	ResourceBundle rb = localeData.getDateFormatData(locale);
	if (rb instanceof ParallelListResourceBundle) {
	localeData.setSupplementary((ParallelListResourceBundle) rb);
	}
	return rb;
	}

	private String getDateTimePattern(String prefix, String key, int styleIndex, String calendarType) {
	StringBuilder sb = new StringBuilder();
	if (prefix != null) {
	sb.append(prefix);
	}
	if (!"gregory".equals(calendarType)) {
	sb.append(calendarType).append('.');
	}
	sb.append(key);
	String resourceKey = sb.toString();
	String cacheKey = sb.insert(0, DATE_TIME_PATTERN).toString();

	removeEmptyReferences();
	ResourceReference data = cache.get(cacheKey);
	Object value = NULLOBJECT;

	if (data == null \|\| ((value = data.get()) == null)) {
	ResourceBundle r = (prefix != null) ? getJavaTimeFormatData() : localeData.getDateFormatData(locale);
	if (r.containsKey(resourceKey)) {
	value = r.getStringArray(resourceKey);
	} else {
	assert !resourceKey.equals(key);
	if (r.containsKey(key)) {
	value = r.getStringArray(key);
	}
	}
	cache.put(cacheKey,
	new ResourceReference(cacheKey, value, referenceQueue));
	}
	if (value == NULLOBJECT) {
	assert prefix != null;
	return null;
	}

	// for DateTimePatterns. CLDR has multiple styles, while JRE has one.
	String[] styles = (String[])value;
	return (styles.length > 1 ? styles[styleIndex] : styles[0]);
	}

	private static class ResourceReference extends SoftReference<Object> {
	private final String cacheKey;

	ResourceReference(String cacheKey, Object o, ReferenceQueue<Object> q) {
	super(o, q);
	this.cacheKey = cacheKey;
	}

	String getCacheKey() {
	return cacheKey;
	}
	}

	private static final boolean TRACE_ON = Boolean.valueOf(
	GetPropertyAction.privilegedGetProperty("locale.resources.debug", "false"));

	public static void trace(String format, Object... params) {
	if (TRACE_ON) {
	System.out.format(format, params);
	}
	}
	}

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