https://openjdk.java.net/ 
/*
 * 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * 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
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * 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.


A significant part of dealing with dates and times is the localization.
This class acts as a central point for accessing the information.

Implementation Requirements:
This class is immutable and thread-safe.
Since:1.8
/**
 * 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.


This uses standard ASCII characters for zero, positive, negative and a dot for the decimal point.

/**
     * 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.

/**
     * The cache of DecimalStyle instances.
     */
    private static final ConcurrentMap<Locale, DecimalStyle> CACHE = new ConcurrentHashMap<>(16, 0.75f, 2);

    
The zero digit.

/**
     * The zero digit.
     */
    private final char zeroDigit;
    
The positive sign.

/**
     * The positive sign.
     */
    private final char positiveSign;
    
The negative sign.

/**
     * The negative sign.
     */
    private final char negativeSign;
    
The decimal separator.

/**
     * The decimal separator.
     */
    private final char decimalSeparator;

    //-----------------------------------------------------------------------
    
Lists all the locales that are supported.


The locale 'en_US' will always be present.

Returns:a Set of Locales for which localization is supported
/**
     * 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 FORMAT locale. 

This method provides access to locale sensitive decimal style symbols.

 This is equivalent to calling 
    of(Locale.getDefault(Locale.Category.FORMAT)). 
See Also:
Returns:the decimal style, not null
/**
     * 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.


This method provides access to locale sensitive decimal style symbols.
If the locale contains "nu" (Numbering System) and/or "rg"
(Region Override) 
Unicode extensions, 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.

Params:
  • locale –  the locale, not null
Returns:the decimal style, not null
/**
     * 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.

Params:
  • zeroChar –  the character to use for the digit of zero
  • positiveSignChar –  the character to use for the positive sign
  • negativeSignChar –  the character to use for the negative sign
  • decimalPointChar –  the character to use for the decimal point
/**
     * 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.


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.

Returns:the character for zero
/**
     * 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.


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.

Params:
  • zeroDigit –  the character for zero
Returns: a copy with a new character that represents zero, not null
/**
     * 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.


The character used to represent a positive number may vary by culture.
This method specifies the character to use.

Returns:the character for the positive sign
/**
     * 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.


The character used to represent a positive number may vary by culture.
This method specifies the character to use.

Params:
  • positiveSign –  the character for the positive sign
Returns: a copy with a new character that represents the positive sign, not null
/**
     * 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.


The character used to represent a negative number may vary by culture.
This method specifies the character to use.

Returns:the character for the negative sign
/**
     * 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.


The character used to represent a negative number may vary by culture.
This method specifies the character to use.

Params:
  • negativeSign –  the character for the negative sign
Returns: a copy with a new character that represents the negative sign, not null
/**
     * 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.


The character used to represent a decimal point may vary by culture.
This method specifies the character to use.

Returns:the character for the decimal point
/**
     * 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.


The character used to represent a decimal point may vary by culture.
This method specifies the character to use.

Params:
  • decimalSeparator –  the character for the decimal point
Returns: a copy with a new character that represents the decimal point, not null
/**
     * 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.

Params:
  • ch –  the character to check
Returns:the value, 0 to 9, of the character, or -1 if not a digit
/**
     * 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.

Params:
  • numericText –  the text, consisting of digits 0 to 9, to convert, not null
Returns:the internationalized text, not null
/**
     * 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.

Params:
  • obj –  the object to check, null returns false
Returns:true if this is equal to the other date
/**
     * 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;
        }
        if (obj instanceof DecimalStyle) {
            DecimalStyle other = (DecimalStyle) obj;
            return (zeroDigit == other.zeroDigit && positiveSign == other.positiveSign &&
                    negativeSign == other.negativeSign && decimalSeparator == other.decimalSeparator);
        }
        return false;
    }

    
A hash code for this DecimalStyle.

Returns:a suitable hash code
/**
     * 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.

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

}