385 lines
14 KiB
Java
385 lines
14 KiB
Java
/*
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* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* This file is available under and governed by the GNU General Public
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* License version 2 only, as published by the Free Software Foundation.
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* However, the following notice accompanied the original version of this
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* file:
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*
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* Copyright (c) 2008-2012, Stephen Colebourne & Michael Nascimento Santos
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* * Neither the name of JSR-310 nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package java.time.format;
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import java.text.DecimalFormatSymbols;
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import java.util.Collections;
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import java.util.HashSet;
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import java.util.Locale;
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import java.util.Objects;
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import java.util.Set;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentMap;
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/**
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* Localized decimal style used in date and time formatting.
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* <p>
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* A significant part of dealing with dates and times is the localization.
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* This class acts as a central point for accessing the information.
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*
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* @implSpec
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* This class is immutable and thread-safe.
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*
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* @since 1.8
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*/
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public final class DecimalStyle {
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/**
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* The standard set of non-localized decimal style symbols.
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* <p>
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* This uses standard ASCII characters for zero, positive, negative and a dot for the decimal point.
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*/
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public static final DecimalStyle STANDARD = new DecimalStyle('0', '+', '-', '.');
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/**
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* The cache of DecimalStyle instances.
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*/
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private static final ConcurrentMap<Locale, DecimalStyle> CACHE = new ConcurrentHashMap<>(16, 0.75f, 2);
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/**
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* The zero digit.
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*/
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private final char zeroDigit;
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/**
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* The positive sign.
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*/
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private final char positiveSign;
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/**
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* The negative sign.
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*/
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private final char negativeSign;
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/**
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* The decimal separator.
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*/
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private final char decimalSeparator;
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//-----------------------------------------------------------------------
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/**
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* Lists all the locales that are supported.
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* <p>
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* The locale 'en_US' will always be present.
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*
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* @return a Set of Locales for which localization is supported
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*/
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public static Set<Locale> getAvailableLocales() {
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Locale[] l = DecimalFormatSymbols.getAvailableLocales();
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Set<Locale> locales = new HashSet<>(l.length);
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Collections.addAll(locales, l);
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return locales;
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}
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/**
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* Obtains the DecimalStyle for the default
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* {@link java.util.Locale.Category#FORMAT FORMAT} locale.
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* <p>
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* This method provides access to locale sensitive decimal style symbols.
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* <p>
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* This is equivalent to calling
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* {@link #of(Locale)
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* of(Locale.getDefault(Locale.Category.FORMAT))}.
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*
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* @see java.util.Locale.Category#FORMAT
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* @return the decimal style, not null
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*/
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public static DecimalStyle ofDefaultLocale() {
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return of(Locale.getDefault(Locale.Category.FORMAT));
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}
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// Android-changed: Remove "rg" extension support in the javadoc. See http://b/228322300.
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/**
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* Obtains the DecimalStyle for the specified locale.
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* <p>
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* This method provides access to locale sensitive decimal style symbols.
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* If the locale contains "nu" (Numbering System)
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* <a href="../../util/Locale.html#def_locale_extension">
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* Unicode extensions</a>, returned instance will reflect the values specified with
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* those extensions.
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*
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* @param locale the locale, not null
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* @return the decimal style, not null
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*/
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public static DecimalStyle of(Locale locale) {
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Objects.requireNonNull(locale, "locale");
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DecimalStyle info = CACHE.get(locale);
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if (info == null) {
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info = create(locale);
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CACHE.putIfAbsent(locale, info);
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info = CACHE.get(locale);
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}
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return info;
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}
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private static DecimalStyle create(Locale locale) {
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DecimalFormatSymbols oldSymbols = DecimalFormatSymbols.getInstance(locale);
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char zeroDigit = oldSymbols.getZeroDigit();
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char positiveSign = '+';
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char negativeSign = oldSymbols.getMinusSign();
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char decimalSeparator = oldSymbols.getDecimalSeparator();
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if (zeroDigit == '0' && negativeSign == '-' && decimalSeparator == '.') {
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return STANDARD;
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}
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return new DecimalStyle(zeroDigit, positiveSign, negativeSign, decimalSeparator);
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}
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//-----------------------------------------------------------------------
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/**
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* Restricted constructor.
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*
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* @param zeroChar the character to use for the digit of zero
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* @param positiveSignChar the character to use for the positive sign
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* @param negativeSignChar the character to use for the negative sign
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* @param decimalPointChar the character to use for the decimal point
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*/
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private DecimalStyle(char zeroChar, char positiveSignChar, char negativeSignChar, char decimalPointChar) {
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this.zeroDigit = zeroChar;
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this.positiveSign = positiveSignChar;
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this.negativeSign = negativeSignChar;
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this.decimalSeparator = decimalPointChar;
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}
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//-----------------------------------------------------------------------
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/**
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* Gets the character that represents zero.
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* <p>
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* The character used to represent digits may vary by culture.
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* This method specifies the zero character to use, which implies the characters for one to nine.
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*
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* @return the character for zero
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*/
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public char getZeroDigit() {
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return zeroDigit;
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}
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/**
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* Returns a copy of the info with a new character that represents zero.
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* <p>
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* The character used to represent digits may vary by culture.
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* This method specifies the zero character to use, which implies the characters for one to nine.
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*
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* @param zeroDigit the character for zero
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* @return a copy with a new character that represents zero, not null
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*/
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public DecimalStyle withZeroDigit(char zeroDigit) {
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if (zeroDigit == this.zeroDigit) {
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return this;
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}
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return new DecimalStyle(zeroDigit, positiveSign, negativeSign, decimalSeparator);
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}
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//-----------------------------------------------------------------------
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/**
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* Gets the character that represents the positive sign.
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* <p>
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* The character used to represent a positive number may vary by culture.
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* This method specifies the character to use.
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*
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* @return the character for the positive sign
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*/
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public char getPositiveSign() {
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return positiveSign;
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}
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/**
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* Returns a copy of the info with a new character that represents the positive sign.
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* <p>
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* The character used to represent a positive number may vary by culture.
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* This method specifies the character to use.
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*
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* @param positiveSign the character for the positive sign
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* @return a copy with a new character that represents the positive sign, not null
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*/
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public DecimalStyle withPositiveSign(char positiveSign) {
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if (positiveSign == this.positiveSign) {
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return this;
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}
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return new DecimalStyle(zeroDigit, positiveSign, negativeSign, decimalSeparator);
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}
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//-----------------------------------------------------------------------
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/**
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* Gets the character that represents the negative sign.
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* <p>
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* The character used to represent a negative number may vary by culture.
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* This method specifies the character to use.
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*
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* @return the character for the negative sign
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*/
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public char getNegativeSign() {
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return negativeSign;
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}
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/**
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* Returns a copy of the info with a new character that represents the negative sign.
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* <p>
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* The character used to represent a negative number may vary by culture.
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* This method specifies the character to use.
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*
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* @param negativeSign the character for the negative sign
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* @return a copy with a new character that represents the negative sign, not null
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*/
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public DecimalStyle withNegativeSign(char negativeSign) {
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if (negativeSign == this.negativeSign) {
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return this;
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}
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return new DecimalStyle(zeroDigit, positiveSign, negativeSign, decimalSeparator);
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}
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//-----------------------------------------------------------------------
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/**
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* Gets the character that represents the decimal point.
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* <p>
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* The character used to represent a decimal point may vary by culture.
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* This method specifies the character to use.
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*
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* @return the character for the decimal point
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*/
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public char getDecimalSeparator() {
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return decimalSeparator;
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}
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/**
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* Returns a copy of the info with a new character that represents the decimal point.
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* <p>
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* The character used to represent a decimal point may vary by culture.
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* This method specifies the character to use.
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*
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* @param decimalSeparator the character for the decimal point
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* @return a copy with a new character that represents the decimal point, not null
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*/
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public DecimalStyle withDecimalSeparator(char decimalSeparator) {
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if (decimalSeparator == this.decimalSeparator) {
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return this;
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}
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return new DecimalStyle(zeroDigit, positiveSign, negativeSign, decimalSeparator);
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}
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//-----------------------------------------------------------------------
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/**
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* Checks whether the character is a digit, based on the currently set zero character.
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*
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* @param ch the character to check
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* @return the value, 0 to 9, of the character, or -1 if not a digit
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*/
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int convertToDigit(char ch) {
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int val = ch - zeroDigit;
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return (val >= 0 && val <= 9) ? val : -1;
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}
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/**
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* Converts the input numeric text to the internationalized form using the zero character.
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*
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* @param numericText the text, consisting of digits 0 to 9, to convert, not null
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* @return the internationalized text, not null
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*/
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String convertNumberToI18N(String numericText) {
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if (zeroDigit == '0') {
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return numericText;
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}
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int diff = zeroDigit - '0';
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char[] array = numericText.toCharArray();
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for (int i = 0; i < array.length; i++) {
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array[i] = (char) (array[i] + diff);
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}
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return new String(array);
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}
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//-----------------------------------------------------------------------
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/**
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* Checks if this DecimalStyle is equal to another DecimalStyle.
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*
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* @param obj the object to check, null returns false
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* @return true if this is equal to the other date
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*/
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@Override
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public boolean equals(Object obj) {
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if (this == obj) {
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return true;
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}
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return (obj instanceof DecimalStyle other
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&& zeroDigit == other.zeroDigit
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&& positiveSign == other.positiveSign
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&& negativeSign == other.negativeSign
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&& decimalSeparator == other.decimalSeparator);
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}
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/**
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* A hash code for this DecimalStyle.
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*
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* @return a suitable hash code
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*/
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@Override
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public int hashCode() {
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return zeroDigit + positiveSign + negativeSign + decimalSeparator;
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}
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//-----------------------------------------------------------------------
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/**
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* Returns a string describing this DecimalStyle.
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*
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* @return a string description, not null
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*/
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@Override
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public String toString() {
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return "DecimalStyle[" + zeroDigit + positiveSign + negativeSign + decimalSeparator + "]";
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}
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}
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