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	/*
	* Copyright (c) 2012, 2013, 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
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	/*
	* This file is available under and governed by the GNU General Public
	* License version 2 only, as published by the Free Software Foundation.
	* However, the following notice accompanied the original version of this
	* file:
	*
	* Copyright (c) 2008-2012, Stephen Colebourne & Michael Nascimento Santos
	*
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are met:
	*
	* * Redistributions of source code must retain the above copyright notice,
	* this list of conditions and the following disclaimer.
	*
	* * Redistributions in binary form must reproduce the above copyright notice,
	* this list of conditions and the following disclaimer in the documentation
	* and/or other materials provided with the distribution.
	*
	* * Neither the name of JSR-310 nor the names of its contributors
	* may be used to endorse or promote products derived from this software
	* without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/
	package java.time.format;

	import java.text.DecimalFormatSymbols;
	import java.util.Collections;
	import java.util.HashSet;
	import java.util.Locale;
	import java.util.Objects;
	import java.util.Set;
	import java.util.concurrent.ConcurrentHashMap;
	import java.util.concurrent.ConcurrentMap;

	/**
	* Localized decimal style used in date and time formatting.
	* <p>
	* A significant part of dealing with dates and times is the localization.
	* This class acts as a central point for accessing the information.
	*
	* @implSpec
	* This class is immutable and thread-safe.
	*
	* @since 1.8
	*/
	public final class DecimalStyle {

	/**
	* The standard set of non-localized decimal style symbols.
	* <p>
	* This uses standard ASCII characters for zero, positive, negative and a dot for the decimal point.
	*/
	public static final DecimalStyle STANDARD = new DecimalStyle('0', '+', '-', '.');
	/**
	* The cache of DecimalStyle instances.
	*/
	private static final ConcurrentMap<Locale, DecimalStyle> CACHE = new ConcurrentHashMap<>(16, 0.75f, 2);

	/**
	* The zero digit.
	*/
	private final char zeroDigit;
	/**
	* The positive sign.
	*/
	private final char positiveSign;
	/**
	* The negative sign.
	*/
	private final char negativeSign;
	/**
	* The decimal separator.
	*/
	private final char decimalSeparator;

	//-----------------------------------------------------------------------
	/**
	* Lists all the locales that are supported.
	* <p>
	* The locale 'en_US' will always be present.
	*
	* @return a Set of Locales for which localization is supported
	*/
	public static Set<Locale> getAvailableLocales() {
	Locale[] l = DecimalFormatSymbols.getAvailableLocales();
	Set<Locale> locales = new HashSet<>(l.length);
	Collections.addAll(locales, l);
	return locales;
	}

	/**
	* Obtains the DecimalStyle for the default
	* {@link java.util.Locale.Category#FORMAT FORMAT} locale.
	* <p>
	* This method provides access to locale sensitive decimal style symbols.
	* <p>
	* This is equivalent to calling
	* {@link #of(Locale)
	* of(Locale.getDefault(Locale.Category.FORMAT))}.
	*
	* @see java.util.Locale.Category#FORMAT
	* @return the decimal style, not null
	*/
	public static DecimalStyle ofDefaultLocale() {
	return of(Locale.getDefault(Locale.Category.FORMAT));
	}

	/**
	* Obtains the DecimalStyle for the specified locale.
	* <p>
	* This method provides access to locale sensitive decimal style symbols.
	* If the locale contains "nu" (Numbering System) and/or "rg"
	* (Region Override) <a href="../../util/Locale.html#def_locale_extension">
	* Unicode extensions</a>, returned instance will reflect the values specified with
	* those extensions. If both "nu" and "rg" are specified, the value from
	* the "nu" extension supersedes the implicit one from the "rg" extension.
	*
	* @param locale the locale, not null
	* @return the decimal style, not null
	*/
	public static DecimalStyle of(Locale locale) {
	Objects.requireNonNull(locale, "locale");
	DecimalStyle info = CACHE.get(locale);
	if (info == null) {
	info = create(locale);
	CACHE.putIfAbsent(locale, info);
	info = CACHE.get(locale);
	}
	return info;
	}

	private static DecimalStyle create(Locale locale) {
	DecimalFormatSymbols oldSymbols = DecimalFormatSymbols.getInstance(locale);
	char zeroDigit = oldSymbols.getZeroDigit();
	char positiveSign = '+';
	char negativeSign = oldSymbols.getMinusSign();
	char decimalSeparator = oldSymbols.getDecimalSeparator();
	if (zeroDigit == '0' && negativeSign == '-' && decimalSeparator == '.') {
	return STANDARD;
	}
	return new DecimalStyle(zeroDigit, positiveSign, negativeSign, decimalSeparator);
	}

	//-----------------------------------------------------------------------
	/**
	* Restricted constructor.
	*
	* @param zeroChar the character to use for the digit of zero
	* @param positiveSignChar the character to use for the positive sign
	* @param negativeSignChar the character to use for the negative sign
	* @param decimalPointChar the character to use for the decimal point
	*/
	private DecimalStyle(char zeroChar, char positiveSignChar, char negativeSignChar, char decimalPointChar) {
	this.zeroDigit = zeroChar;
	this.positiveSign = positiveSignChar;
	this.negativeSign = negativeSignChar;
	this.decimalSeparator = decimalPointChar;
	}

	//-----------------------------------------------------------------------
	/**
	* Gets the character that represents zero.
	* <p>
	* The character used to represent digits may vary by culture.
	* This method specifies the zero character to use, which implies the characters for one to nine.
	*
	* @return the character for zero
	*/
	public char getZeroDigit() {
	return zeroDigit;
	}

	/**
	* Returns a copy of the info with a new character that represents zero.
	* <p>
	* The character used to represent digits may vary by culture.
	* This method specifies the zero character to use, which implies the characters for one to nine.
	*
	* @param zeroDigit the character for zero
	* @return a copy with a new character that represents zero, not null
	*/
	public DecimalStyle withZeroDigit(char zeroDigit) {
	if (zeroDigit == this.zeroDigit) {
	return this;
	}
	return new DecimalStyle(zeroDigit, positiveSign, negativeSign, decimalSeparator);
	}

	//-----------------------------------------------------------------------
	/**
	* Gets the character that represents the positive sign.
	* <p>
	* The character used to represent a positive number may vary by culture.
	* This method specifies the character to use.
	*
	* @return the character for the positive sign
	*/
	public char getPositiveSign() {
	return positiveSign;
	}

	/**
	* Returns a copy of the info with a new character that represents the positive sign.
	* <p>
	* The character used to represent a positive number may vary by culture.
	* This method specifies the character to use.
	*
	* @param positiveSign the character for the positive sign
	* @return a copy with a new character that represents the positive sign, not null
	*/
	public DecimalStyle withPositiveSign(char positiveSign) {
	if (positiveSign == this.positiveSign) {
	return this;
	}
	return new DecimalStyle(zeroDigit, positiveSign, negativeSign, decimalSeparator);
	}

	//-----------------------------------------------------------------------
	/**
	* Gets the character that represents the negative sign.
	* <p>
	* The character used to represent a negative number may vary by culture.
	* This method specifies the character to use.
	*
	* @return the character for the negative sign
	*/
	public char getNegativeSign() {
	return negativeSign;
	}

	/**
	* Returns a copy of the info with a new character that represents the negative sign.
	* <p>
	* The character used to represent a negative number may vary by culture.
	* This method specifies the character to use.
	*
	* @param negativeSign the character for the negative sign
	* @return a copy with a new character that represents the negative sign, not null
	*/
	public DecimalStyle withNegativeSign(char negativeSign) {
	if (negativeSign == this.negativeSign) {
	return this;
	}
	return new DecimalStyle(zeroDigit, positiveSign, negativeSign, decimalSeparator);
	}

	//-----------------------------------------------------------------------
	/**
	* Gets the character that represents the decimal point.
	* <p>
	* The character used to represent a decimal point may vary by culture.
	* This method specifies the character to use.
	*
	* @return the character for the decimal point
	*/
	public char getDecimalSeparator() {
	return decimalSeparator;
	}

	/**
	* Returns a copy of the info with a new character that represents the decimal point.
	* <p>
	* The character used to represent a decimal point may vary by culture.
	* This method specifies the character to use.
	*
	* @param decimalSeparator the character for the decimal point
	* @return a copy with a new character that represents the decimal point, not null
	*/
	public DecimalStyle withDecimalSeparator(char decimalSeparator) {
	if (decimalSeparator == this.decimalSeparator) {
	return this;
	}
	return new DecimalStyle(zeroDigit, positiveSign, negativeSign, decimalSeparator);
	}

	//-----------------------------------------------------------------------
	/**
	* Checks whether the character is a digit, based on the currently set zero character.
	*
	* @param ch the character to check
	* @return the value, 0 to 9, of the character, or -1 if not a digit
	*/
	int convertToDigit(char ch) {
	int val = ch - zeroDigit;
	return (val >= 0 && val <= 9) ? val : -1;
	}

	/**
	* Converts the input numeric text to the internationalized form using the zero character.
	*
	* @param numericText the text, consisting of digits 0 to 9, to convert, not null
	* @return the internationalized text, not null
	*/
	String convertNumberToI18N(String numericText) {
	if (zeroDigit == '0') {
	return numericText;
	}
	int diff = zeroDigit - '0';
	char[] array = numericText.toCharArray();
	for (int i = 0; i < array.length; i++) {
	array[i] = (char) (array[i] + diff);
	}
	return new String(array);
	}

	//-----------------------------------------------------------------------
	/**
	* Checks if this DecimalStyle is equal to another DecimalStyle.
	*
	* @param obj the object to check, null returns false
	* @return true if this is equal to the other date
	*/
	@Override
	public boolean equals(Object obj) {
	if (this == obj) {
	return true;
	}
	return (obj instanceof DecimalStyle other
	&& zeroDigit == other.zeroDigit
	&& positiveSign == other.positiveSign
	&& negativeSign == other.negativeSign
	&& decimalSeparator == other.decimalSeparator);
	}

	/**
	* A hash code for this DecimalStyle.
	*
	* @return a suitable hash code
	*/
	@Override
	public int hashCode() {
	return zeroDigit + positiveSign + negativeSign + decimalSeparator;
	}

	//-----------------------------------------------------------------------
	/**
	* Returns a string describing this DecimalStyle.
	*
	* @return a string description, not null
	*/
	@Override
	public String toString() {
	return "DecimalStyle[" + zeroDigit + positiveSign + negativeSign + decimalSeparator + "]";
	}

	}

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