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   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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:
   *
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   *    this list of conditions and the following disclaimer.
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  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 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 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.
       *
       * @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;
          }
          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.
       *
       * @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 + "]";
      }
  
  }
  