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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.locale.provider;

	import static java.util.Calendar.*;
	import java.util.Comparator;
	import java.util.Locale;
	import java.util.Map;
	import java.util.Set;
	import java.util.TreeMap;
	import java.util.spi.CalendarNameProvider;
	import sun.util.calendar.CalendarSystem;
	import sun.util.calendar.Era;

	/**
	* Concrete implementation of the {@link java.util.spi.CalendarNameProvider
	* CalendarNameProvider} class for the JRE LocaleProviderAdapter.
	*
	* @author Masayoshi Okutsu
	* @author Naoto Sato
	*/
	public class CalendarNameProviderImpl extends CalendarNameProvider implements AvailableLanguageTags {
	protected final LocaleProviderAdapter.Type type;
	protected final Set<String> langtags;

	public CalendarNameProviderImpl(LocaleProviderAdapter.Type type, Set<String> langtags) {
	this.type = type;
	this.langtags = langtags;
	}

	@Override
	public String getDisplayName(String calendarType, int field, int value, int style, Locale locale) {
	return getDisplayNameImpl(calendarType, field, value, style, locale, false);
	}

	public String getJavaTimeDisplayName(String calendarType, int field, int value, int style, Locale locale) {
	return getDisplayNameImpl(calendarType, field, value, style, locale, true);
	}

	public String getDisplayNameImpl(String calendarType, int field, int value, int style, Locale locale, boolean javatime) {
	String name = null;
	String key = getResourceKey(calendarType, field, style, javatime);
	if (key != null) {
	LocaleResources lr = LocaleProviderAdapter.forType(type).getLocaleResources(locale);
	String[] strings = javatime ? lr.getJavaTimeNames(key) : lr.getCalendarNames(key);

	// If standalone names are requested and no "standalone." resources are found,
	// try the default ones instead.
	if (strings == null && key.indexOf("standalone.") != -1) {
	key = key.replaceFirst("standalone.", "");
	strings = javatime ? lr.getJavaTimeNames(key) : lr.getCalendarNames(key);
	}

	if (strings != null && strings.length > 0) {
	if (field == DAY_OF_WEEK \|\| field == YEAR) {
	--value;
	}
	if (value < 0) {
	return null;
	} else if (value >= strings.length) {
	if (field == ERA && "japanese".equals(calendarType)) {
	Era[] jeras = CalendarSystem.forName("japanese").getEras();
	if (value <= jeras.length) {
	// Localized era name could not be retrieved from this provider.
	// This can occur either for NewEra or SupEra.
	//
	// If it's CLDR provider, try COMPAT first, which is guaranteed to have
	// the name for NewEra.
	if (type == LocaleProviderAdapter.Type.CLDR) {
	lr = LocaleProviderAdapter.forJRE().getLocaleResources(locale);
	key = getResourceKeyFor(LocaleProviderAdapter.Type.JRE,
	calendarType, field, style, javatime);
	strings =
	javatime ? lr.getJavaTimeNames(key) : lr.getCalendarNames(key);
	}
	if (strings == null \|\| value >= strings.length) {
	// Get the default name for SupEra
	Era supEra = jeras[value - 1]; // 0-based index
	if (javatime) {
	return getBaseStyle(style) == NARROW_FORMAT ?
	supEra.getAbbreviation() :
	supEra.getName();
	} else {
	return (style & LONG) != 0 ?
	supEra.getName() :
	supEra.getAbbreviation();
	}
	}
	} else {
	return null;
	}
	} else {
	return null;
	}
	}
	name = strings[value];
	// If name is empty in standalone, try its `format' style.
	if (name.length() == 0
	&& (style == SHORT_STANDALONE \|\| style == LONG_STANDALONE
	\|\| style == NARROW_STANDALONE)) {
	name = getDisplayName(calendarType, field, value,
	getBaseStyle(style),
	locale);
	}
	}
	}
	return name;
	}

	private static int[] REST_OF_STYLES = {
	SHORT_STANDALONE, LONG_FORMAT, LONG_STANDALONE,
	NARROW_FORMAT, NARROW_STANDALONE
	};

	@Override
	public Map<String, Integer> getDisplayNames(String calendarType, int field, int style, Locale locale) {
	Map<String, Integer> names;
	if (style == ALL_STYLES) {
	names = getDisplayNamesImpl(calendarType, field, SHORT_FORMAT, locale, false);
	for (int st : REST_OF_STYLES) {
	names.putAll(getDisplayNamesImpl(calendarType, field, st, locale, false));
	}
	} else {
	// specific style
	names = getDisplayNamesImpl(calendarType, field, style, locale, false);
	}
	return names.isEmpty() ? null : names;
	}

	// NOTE: This method should be used ONLY BY JSR 310 classes.
	public Map<String, Integer> getJavaTimeDisplayNames(String calendarType, int field, int style, Locale locale) {
	Map<String, Integer> names;
	names = getDisplayNamesImpl(calendarType, field, style, locale, true);
	return names.isEmpty() ? null : names;
	}

	private Map<String, Integer> getDisplayNamesImpl(String calendarType, int field,
	int style, Locale locale, boolean javatime) {
	String key = getResourceKey(calendarType, field, style, javatime);
	Map<String, Integer> map = new TreeMap<>(LengthBasedComparator.INSTANCE);
	if (key != null) {
	LocaleResources lr = LocaleProviderAdapter.forType(type).getLocaleResources(locale);
	String[] strings = javatime ? lr.getJavaTimeNames(key) : lr.getCalendarNames(key);

	// If standalone names are requested and no "standalone." resources are found,
	// try the default ones instead.
	if (strings == null && key.indexOf("standalone.") != -1) {
	key = key.replaceFirst("standalone.", "");
	strings = javatime ? lr.getJavaTimeNames(key) : lr.getCalendarNames(key);
	}

	if (strings != null) {
	if (!hasDuplicates(strings)) {
	if (field == YEAR) {
	if (strings.length > 0) {
	map.put(strings[0], 1);
	}
	} else {
	int base = (field == DAY_OF_WEEK) ? 1 : 0;
	for (int i = 0; i < strings.length; i++) {
	String name = strings[i];
	// Ignore any empty string (some standalone month names
	// are not defined)
	if (name.length() == 0) {
	continue;
	}
	map.put(name, base + i);
	}
	}
	}
	}
	}
	return map;
	}

	private static int getBaseStyle(int style) {
	return style & ~(SHORT_STANDALONE - SHORT_FORMAT);
	}

	/**
	* Comparator implementation for TreeMap which iterates keys from longest
	* to shortest.
	*/
	private static class LengthBasedComparator implements Comparator<String> {
	private static final LengthBasedComparator INSTANCE = new LengthBasedComparator();

	private LengthBasedComparator() {
	}

	@Override
	public int compare(String o1, String o2) {
	int n = o2.length() - o1.length();
	return (n == 0) ? o1.compareTo(o2) : n;
	}
	}

	@Override
	public Locale[] getAvailableLocales() {
	return LocaleProviderAdapter.toLocaleArray(langtags);
	}

	@Override
	public boolean isSupportedLocale(Locale locale) {
	if (Locale.ROOT.equals(locale)) {
	return true;
	}
	String calendarType = null;
	if (locale.hasExtensions()) {
	calendarType = locale.getUnicodeLocaleType("ca");
	locale = locale.stripExtensions();
	}

	if (calendarType != null) {
	switch (calendarType) {
	case "buddhist":
	case "japanese":
	case "gregory":
	case "islamic":
	case "roc":
	break;
	default:
	// Unknown calendar type
	return false;
	}
	}
	if (langtags.contains(locale.toLanguageTag())) {
	return true;
	}
	String oldname = locale.toString().replace('_', '-');
	return langtags.contains(oldname);
	}

	@Override
	public Set<String> getAvailableLanguageTags() {
	return langtags;
	}

	private boolean hasDuplicates(String[] strings) {
	int len = strings.length;
	for (int i = 0; i < len - 1; i++) {
	String a = strings[i];
	if (a != null) {
	for (int j = i + 1; j < len; j++) {
	if (a.equals(strings[j])) {
	return true;
	}
	}
	}
	}
	return false;
	}

	private String getResourceKey(String type, int field, int style, boolean javatime) {
	return getResourceKeyFor(this.type, type, field, style, javatime);
	}

	private static String getResourceKeyFor(LocaleProviderAdapter.Type adapterType,
	String type, int field, int style, boolean javatime) {
	int baseStyle = getBaseStyle(style);
	boolean isStandalone = (style != baseStyle);

	if ("gregory".equals(type)) {
	type = null;
	}
	boolean isNarrow = (baseStyle == NARROW_FORMAT);
	StringBuilder key = new StringBuilder();
	// If javatime is true, use prefix "java.time.".
	if (javatime) {
	key.append("java.time.");
	}
	switch (field) {
	case ERA:
	if (type != null) {
	key.append(type).append('.');
	}
	if (isNarrow) {
	key.append("narrow.");
	} else {
	// JRE and CLDR use different resource key conventions
	// due to historical reasons. (JRE DateFormatSymbols.getEras returns
	// abbreviations while other getShort*() return abbreviations.)
	if (adapterType == LocaleProviderAdapter.Type.JRE) {
	if (javatime) {
	if (baseStyle == LONG) {
	key.append("long.");
	}
	}
	if (baseStyle == SHORT) {
	key.append("short.");
	}
	} else { // this.type == LocaleProviderAdapter.Type.CLDR
	if (baseStyle == LONG) {
	key.append("long.");
	}
	}
	}
	key.append("Eras");
	break;

	case YEAR:
	if (!isNarrow) {
	key.append(type).append(".FirstYear");
	}
	break;

	case MONTH:
	if ("islamic".equals(type)) {
	key.append(type).append('.');
	}
	if (isStandalone) {
	key.append("standalone.");
	}
	key.append("Month").append(toStyleName(baseStyle));
	break;

	case DAY_OF_WEEK:
	// support standalone day names
	if (isStandalone) {
	key.append("standalone.");
	}
	key.append("Day").append(toStyleName(baseStyle));
	break;

	case AM_PM:
	if (isNarrow) {
	key.append("narrow.");
	}
	key.append("AmPmMarkers");
	break;
	}
	return key.length() > 0 ? key.toString() : null;
	}

	private static String toStyleName(int baseStyle) {
	switch (baseStyle) {
	case SHORT:
	return "Abbreviations";
	case NARROW_FORMAT:
	return "Narrows";
	}
	return "Names";
	}
	}

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