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	/*
	* Copyright (c) 2010, 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.
	*/

	/*
	*******************************************************************************
	* Copyright (C) 2009-2010, International Business Machines Corporation and *
	* others. All Rights Reserved. *
	*******************************************************************************
	*/

	package sun.util.locale;

	import java.lang.ref.SoftReference;
	import java.util.StringJoiner;

	public final class BaseLocale {

	public static final String SEP = "_";

	private static final Cache CACHE = new Cache();

	private final String language;
	private final String script;
	private final String region;
	private final String variant;

	private volatile int hash;

	// This method must be called with normalize = false only when creating the
	// Locale.* constants and non-normalized BaseLocale$Keys used for lookup.
	private BaseLocale(String language, String script, String region, String variant,
	boolean normalize) {
	if (normalize) {
	this.language = LocaleUtils.toLowerString(language).intern();
	this.script = LocaleUtils.toTitleString(script).intern();
	this.region = LocaleUtils.toUpperString(region).intern();
	this.variant = variant.intern();
	} else {
	this.language = language;
	this.script = script;
	this.region = region;
	this.variant = variant;
	}
	}

	// Called for creating the Locale.* constants. No argument
	// validation is performed.
	public static BaseLocale createInstance(String language, String region) {
	BaseLocale base = new BaseLocale(language, "", region, "", false);
	CACHE.put(new Key(base), base);
	return base;
	}

	public static BaseLocale getInstance(String language, String script,
	String region, String variant) {
	// JDK uses deprecated ISO639.1 language codes for he, yi and id
	if (language != null) {
	if (LocaleUtils.caseIgnoreMatch(language, "he")) {
	language = "iw";
	} else if (LocaleUtils.caseIgnoreMatch(language, "yi")) {
	language = "ji";
	} else if (LocaleUtils.caseIgnoreMatch(language, "id")) {
	language = "in";
	}
	}

	Key key = new Key(language, script, region, variant, false);
	BaseLocale baseLocale = CACHE.get(key);
	return baseLocale;
	}

	public String getLanguage() {
	return language;
	}

	public String getScript() {
	return script;
	}

	public String getRegion() {
	return region;
	}

	public String getVariant() {
	return variant;
	}

	@Override
	public boolean equals(Object obj) {
	if (this == obj) {
	return true;
	}
	if (!(obj instanceof BaseLocale)) {
	return false;
	}
	BaseLocale other = (BaseLocale)obj;
	return language == other.language
	&& script == other.script
	&& region == other.region
	&& variant == other.variant;
	}

	@Override
	public String toString() {
	StringJoiner sj = new StringJoiner(", ");
	if (!language.isEmpty()) {
	sj.add("language=" + language);
	}
	if (!script.isEmpty()) {
	sj.add("script=" + script);
	}
	if (!region.isEmpty()) {
	sj.add("region=" + region);
	}
	if (!variant.isEmpty()) {
	sj.add("variant=" + variant);
	}
	return sj.toString();
	}

	@Override
	public int hashCode() {
	int h = hash;
	if (h == 0) {
	// Generating a hash value from language, script, region and variant
	h = language.hashCode();
	h = 31 * h + script.hashCode();
	h = 31 * h + region.hashCode();
	h = 31 * h + variant.hashCode();
	if (h != 0) {
	hash = h;
	}
	}
	return h;
	}

	private static final class Key {
	/**
	* Keep a SoftReference to the Key data if normalized (actually used
	* as a cache key) and not initialized via the constant creation path.
	*
	* This allows us to avoid creating SoftReferences on lookup Keys
	* (which are short-lived) and for Locales created via
	* Locale#createConstant.
	*/
	private final SoftReference<BaseLocale> holderRef;
	private final BaseLocale holder;

	private final boolean normalized;
	private final int hash;

	/**
	* Creates a Key. language and region must be normalized
	* (intern'ed in the proper case).
	*/
	private Key(BaseLocale locale) {
	this.holder = locale;
	this.holderRef = null;
	this.normalized = true;
	String language = locale.getLanguage();
	String region = locale.getRegion();
	assert LocaleUtils.toLowerString(language).intern() == language
	&& LocaleUtils.toUpperString(region).intern() == region
	&& locale.getVariant() == ""
	&& locale.getScript() == "";

	int h = language.hashCode();
	if (region != "") {
	int len = region.length();
	for (int i = 0; i < len; i++) {
	h = 31 * h + LocaleUtils.toLower(region.charAt(i));
	}
	}
	hash = h;
	}

	private Key(String language, String script, String region,
	String variant, boolean normalize) {
	if (language == null) {
	language = "";
	}
	if (script == null) {
	script = "";
	}
	if (region == null) {
	region = "";
	}
	if (variant == null) {
	variant = "";
	}

	BaseLocale locale = new BaseLocale(language, script, region, variant, normalize);
	this.normalized = normalize;
	if (normalized) {
	this.holderRef = new SoftReference<>(locale);
	this.holder = null;
	} else {
	this.holderRef = null;
	this.holder = locale;
	}
	this.hash = hashCode(locale);
	}

	public int hashCode() {
	return hash;
	}

	private int hashCode(BaseLocale locale) {
	int h = 0;
	String lang = locale.getLanguage();
	int len = lang.length();
	for (int i = 0; i < len; i++) {
	h = 31*h + LocaleUtils.toLower(lang.charAt(i));
	}
	String scrt = locale.getScript();
	len = scrt.length();
	for (int i = 0; i < len; i++) {
	h = 31*h + LocaleUtils.toLower(scrt.charAt(i));
	}
	String regn = locale.getRegion();
	len = regn.length();
	for (int i = 0; i < len; i++) {
	h = 31*h + LocaleUtils.toLower(regn.charAt(i));
	}
	String vart = locale.getVariant();
	len = vart.length();
	for (int i = 0; i < len; i++) {
	h = 31*h + vart.charAt(i);
	}
	return h;
	}

	private BaseLocale getBaseLocale() {
	return (holder == null) ? holderRef.get() : holder;
	}

	@Override
	public boolean equals(Object obj) {
	if (this == obj) {
	return true;
	}
	if (obj instanceof Key && this.hash == ((Key)obj).hash) {
	BaseLocale other = ((Key) obj).getBaseLocale();
	BaseLocale locale = this.getBaseLocale();
	if (other != null && locale != null
	&& LocaleUtils.caseIgnoreMatch(other.getLanguage(), locale.getLanguage())
	&& LocaleUtils.caseIgnoreMatch(other.getScript(), locale.getScript())
	&& LocaleUtils.caseIgnoreMatch(other.getRegion(), locale.getRegion())
	// variant is case sensitive in JDK!
	&& other.getVariant().equals(locale.getVariant())) {
	return true;
	}
	}
	return false;
	}

	public static Key normalize(Key key) {
	if (key.normalized) {
	return key;
	}

	// Only normalized keys may be softly referencing the data holder
	assert (key.holder != null && key.holderRef == null);
	BaseLocale locale = key.holder;
	return new Key(locale.getLanguage(), locale.getScript(),
	locale.getRegion(), locale.getVariant(), true);
	}
	}

	private static class Cache extends LocaleObjectCache<Key, BaseLocale> {

	public Cache() {
	}

	@Override
	protected Key normalizeKey(Key key) {
	return Key.normalize(key);
	}

	@Override
	protected BaseLocale createObject(Key key) {
	return Key.normalize(key).getBaseLocale();
	}
	}
	}

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