java/11 : java.base/java/util/Currency.java

Currency
https://openjdk.java.net/
GPLv2 + Classpath Exception
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package java.util;

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileReader;
import java.io.InputStream;
import java.io.IOException;
import java.io.Serializable;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
import java.util.spi.CurrencyNameProvider;
import java.util.stream.Collectors;

import jdk.internal.util.StaticProperty;
import sun.util.locale.provider.CalendarDataUtility;
import sun.util.locale.provider.LocaleServiceProviderPool;
import sun.util.logging.PlatformLogger;


Represents a currency. Currencies are identified by their ISO 4217 currency
codes. Visit the 
ISO web site for more information.

The class is designed so that there's never more than one
Currency instance for any given currency. Therefore, there's
no public constructor. You obtain a Currency instance using
the getInstance methods.
 Users can supersede the Java runtime currency data by means of the system property java.util.currency.data. If this system property is defined then its value is the location of a properties file, the contents of which are key/value pairs of the ISO 3166 country codes and the ISO 4217 currency data respectively. The value part consists of three ISO 4217 values of a currency, i.e., an alphabetic code, a numeric code, and a minor unit. Those three ISO 4217 values are separated by commas. The lines which start with '#'s are considered comment lines. An optional UTC timestamp may be specified per currency entry if users need to specify a cutover date indicating when the new data comes into effect. The timestamp is appended to the end of the currency properties and uses a comma as a separator. If a UTC datestamp is present and valid, the JRE will only use the new currency properties if the current UTC date is later than the date specified at class loading time. The format of the timestamp must be of ISO 8601 format : 'yyyy-MM-dd'T'HH:mm:ss'. For example, 


#Sample currency properties

JP=JPZ,999,0


will supersede the currency data for Japan. If JPZ is one of the existing
ISO 4217 currency code referred by other countries, the existing
JPZ currency data is updated with the given numeric code and minor
unit value.


#Sample currency properties with cutover date

JP=JPZ,999,0,2014-01-01T00:00:00

 will supersede the currency data for Japan if Currency class is loaded after 1st January 2014 00:00:00 GMT. 
 Where syntactically malformed entries are encountered, the entry is ignored and the remainder of entries in file are processed. For instances where duplicate country code entries exist, the behavior of the Currency information for that Currency is undefined and the remainder of entries in file are processed. 

If multiple property entries with same currency code but different numeric code
and/or minor unit are encountered, those entries are ignored and the remainder
of entries in file are processed.
 It is recommended to use BigDecimal class while dealing with Currency or monetary values as it provides better handling of floating point numbers and their operations. 
See Also: BigDecimal
Since: 1.4/**
 * Represents a currency. Currencies are identified by their ISO 4217 currency
 * codes. Visit the <a href="http://www.iso.org/iso/home/standards/currency_codes.htm">
 * ISO web site</a> for more information.
 * <p>
 * The class is designed so that there's never more than one
 * <code>Currency</code> instance for any given currency. Therefore, there's
 * no public constructor. You obtain a <code>Currency</code> instance using
 * the <code>getInstance</code> methods.
 * <p>
 * Users can supersede the Java runtime currency data by means of the system
 * property {@code java.util.currency.data}. If this system property is
 * defined then its value is the location of a properties file, the contents of
 * which are key/value pairs of the ISO 3166 country codes and the ISO 4217
 * currency data respectively.  The value part consists of three ISO 4217 values
 * of a currency, i.e., an alphabetic code, a numeric code, and a minor unit.
 * Those three ISO 4217 values are separated by commas.
 * The lines which start with '#'s are considered comment lines. An optional UTC
 * timestamp may be specified per currency entry if users need to specify a
 * cutover date indicating when the new data comes into effect. The timestamp is
 * appended to the end of the currency properties and uses a comma as a separator.
 * If a UTC datestamp is present and valid, the JRE will only use the new currency
 * properties if the current UTC date is later than the date specified at class
 * loading time. The format of the timestamp must be of ISO 8601 format :
 * {@code 'yyyy-MM-dd'T'HH:mm:ss'}. For example,
 * <p>
 * <code>
 * #Sample currency properties<br>
 * JP=JPZ,999,0
 * </code>
 * <p>
 * will supersede the currency data for Japan. If JPZ is one of the existing
 * ISO 4217 currency code referred by other countries, the existing
 * JPZ currency data is updated with the given numeric code and minor
 * unit value.
 *
 * <p>
 * <code>
 * #Sample currency properties with cutover date<br>
 * JP=JPZ,999,0,2014-01-01T00:00:00
 * </code>
 * <p>
 * will supersede the currency data for Japan if {@code Currency} class is loaded after
 * 1st January 2014 00:00:00 GMT.
 * <p>
 * Where syntactically malformed entries are encountered, the entry is ignored
 * and the remainder of entries in file are processed. For instances where duplicate
 * country code entries exist, the behavior of the Currency information for that
 * {@code Currency} is undefined and the remainder of entries in file are processed.
 * <p>
 * If multiple property entries with same currency code but different numeric code
 * and/or minor unit are encountered, those entries are ignored and the remainder
 * of entries in file are processed.
 *
 * <p>
 * It is recommended to use {@link java.math.BigDecimal} class while dealing
 * with {@code Currency} or monetary values as it provides better handling of floating
 * point numbers and their operations.
 *
 * @see java.math.BigDecimal
 * @since 1.4
 */
public final class Currency implements Serializable {

    private static final long serialVersionUID = -158308464356906721L;

    ISO 4217 currency code for this currency.
@serial /**
     * ISO 4217 currency code for this currency.
     *
     * @serial
     */
    private final String currencyCode;

    Default fraction digits for this currency.
Set from currency data tables.
/**
     * Default fraction digits for this currency.
     * Set from currency data tables.
     */
    private final transient int defaultFractionDigits;

    ISO 4217 numeric code for this currency.
Set from currency data tables.
/**
     * ISO 4217 numeric code for this currency.
     * Set from currency data tables.
     */
    private final transient int numericCode;


    // class data: instance map

    private static ConcurrentMap<String, Currency> instances = new ConcurrentHashMap<>(7);
    private static HashSet<Currency> available;

    // Class data: currency data obtained from currency.data file.
    // Purpose:
    // - determine valid country codes
    // - determine valid currency codes
    // - map country codes to currency codes
    // - obtain default fraction digits for currency codes
    //
    // sc = special case; dfd = default fraction digits
    // Simple countries are those where the country code is a prefix of the
    // currency code, and there are no known plans to change the currency.
    //
    // table formats:
    // - mainTable:
    //   - maps country code to 32-bit int
    //   - 26*26 entries, corresponding to [A-Z]*[A-Z]
    //   - \u007F -> not valid country
    //   - bits 20-31: unused
    //   - bits 10-19: numeric code (0 to 1023)
    //   - bit 9: 1 - special case, bits 0-4 indicate which one
    //            0 - simple country, bits 0-4 indicate final char of currency code
    //   - bits 5-8: fraction digits for simple countries, 0 for special cases
    //   - bits 0-4: final char for currency code for simple country, or ID of special case
    // - special case IDs:
    //   - 0: country has no currency
    //   - other: index into specialCasesList

    static int formatVersion;
    static int dataVersion;
    static int[] mainTable;
    static List<SpecialCaseEntry> specialCasesList;
    static List<OtherCurrencyEntry> otherCurrenciesList;

    // handy constants - must match definitions in GenerateCurrencyData
    // magic number
    private static final int MAGIC_NUMBER = 0x43757244;
    // number of characters from A to Z
    private static final int A_TO_Z = ('Z' - 'A') + 1;
    // entry for invalid country codes
    private static final int INVALID_COUNTRY_ENTRY = 0x0000007F;
    // entry for countries without currency
    private static final int COUNTRY_WITHOUT_CURRENCY_ENTRY = 0x00000200;
    // mask for simple case country entries
    private static final int SIMPLE_CASE_COUNTRY_MASK = 0x00000000;
    // mask for simple case country entry final character
    private static final int SIMPLE_CASE_COUNTRY_FINAL_CHAR_MASK = 0x0000001F;
    // mask for simple case country entry default currency digits
    private static final int SIMPLE_CASE_COUNTRY_DEFAULT_DIGITS_MASK = 0x000001E0;
    // shift count for simple case country entry default currency digits
    private static final int SIMPLE_CASE_COUNTRY_DEFAULT_DIGITS_SHIFT = 5;
    // maximum number for simple case country entry default currency digits
    private static final int SIMPLE_CASE_COUNTRY_MAX_DEFAULT_DIGITS = 9;
    // mask for special case country entries
    private static final int SPECIAL_CASE_COUNTRY_MASK = 0x00000200;
    // mask for special case country index
    private static final int SPECIAL_CASE_COUNTRY_INDEX_MASK = 0x0000001F;
    // delta from entry index component in main table to index into special case tables
    private static final int SPECIAL_CASE_COUNTRY_INDEX_DELTA = 1;
    // mask for distinguishing simple and special case countries
    private static final int COUNTRY_TYPE_MASK = SIMPLE_CASE_COUNTRY_MASK | SPECIAL_CASE_COUNTRY_MASK;
    // mask for the numeric code of the currency
    private static final int NUMERIC_CODE_MASK = 0x000FFC00;
    // shift count for the numeric code of the currency
    private static final int NUMERIC_CODE_SHIFT = 10;

    // Currency data format version
    private static final int VALID_FORMAT_VERSION = 3;

    static {
        AccessController.doPrivileged(new PrivilegedAction<>() {
            @Override
            public Void run() {
                try {
                    try (InputStream in = getClass().getResourceAsStream("/java/util/currency.data")) {
                        if (in == null) {
                            throw new InternalError("Currency data not found");
                        }
                        DataInputStream dis = new DataInputStream(new BufferedInputStream(in));
                        if (dis.readInt() != MAGIC_NUMBER) {
                            throw new InternalError("Currency data is possibly corrupted");
                        }
                        formatVersion = dis.readInt();
                        if (formatVersion != VALID_FORMAT_VERSION) {
                            throw new InternalError("Currency data format is incorrect");
                        }
                        dataVersion = dis.readInt();
                        mainTable = readIntArray(dis, A_TO_Z * A_TO_Z);
                        int scCount = dis.readInt();
                        specialCasesList = readSpecialCases(dis, scCount);
                        int ocCount = dis.readInt();
                        otherCurrenciesList = readOtherCurrencies(dis, ocCount);
                    }
                } catch (IOException e) {
                    throw new InternalError(e);
                }

                // look for the properties file for overrides
                String propsFile = System.getProperty("java.util.currency.data");
                if (propsFile == null) {
                    propsFile = StaticProperty.javaHome() + File.separator + "lib" +
                        File.separator + "currency.properties";
                }
                try {
                    File propFile = new File(propsFile);
                    if (propFile.exists()) {
                        Properties props = new Properties();
                        try (FileReader fr = new FileReader(propFile)) {
                            props.load(fr);
                        }
                        Pattern propertiesPattern =
                                Pattern.compile("([A-Z]{3})\\s*,\\s*(\\d{3})\\s*,\\s*" +
                                        "(\\d+)\\s*,?\\s*(\\d{4}-\\d{2}-\\d{2}T\\d{2}:" +
                                        "\\d{2}:\\d{2})?");
                        List<CurrencyProperty> currencyEntries
                                = getValidCurrencyData(props, propertiesPattern);
                        currencyEntries.forEach(Currency::replaceCurrencyData);
                    }
                } catch (IOException e) {
                    CurrencyProperty.info("currency.properties is ignored"
                            + " because of an IOException", e);
                }
                return null;
            }
        });
    }

    Constants for retrieving localized names from the name providers.
/**
     * Constants for retrieving localized names from the name providers.
     */
    private static final int SYMBOL = 0;
    private static final int DISPLAYNAME = 1;


    Constructs a Currency instance. The constructor is private
so that we can insure that there's never more than one instance for a
given currency.
/**
     * Constructs a <code>Currency</code> instance. The constructor is private
     * so that we can insure that there's never more than one instance for a
     * given currency.
     */
    private Currency(String currencyCode, int defaultFractionDigits, int numericCode) {
        this.currencyCode = currencyCode;
        this.defaultFractionDigits = defaultFractionDigits;
        this.numericCode = numericCode;
    }

    Returns the Currency instance for the given currency code.
Params: currencyCode – the ISO 4217 code of the currency
Throws: NullPointerException – if currencyCode is null
IllegalArgumentException – if currencyCode is not
a supported ISO 4217 code.
Returns: the Currency instance for the given currency code/**
     * Returns the <code>Currency</code> instance for the given currency code.
     *
     * @param currencyCode the ISO 4217 code of the currency
     * @return the <code>Currency</code> instance for the given currency code
     * @exception NullPointerException if <code>currencyCode</code> is null
     * @exception IllegalArgumentException if <code>currencyCode</code> is not
     * a supported ISO 4217 code.
     */
    public static Currency getInstance(String currencyCode) {
        return getInstance(currencyCode, Integer.MIN_VALUE, 0);
    }

    private static Currency getInstance(String currencyCode, int defaultFractionDigits,
        int numericCode) {
        // Try to look up the currency code in the instances table.
        // This does the null pointer check as a side effect.
        // Also, if there already is an entry, the currencyCode must be valid.
        Currency instance = instances.get(currencyCode);
        if (instance != null) {
            return instance;
        }

        if (defaultFractionDigits == Integer.MIN_VALUE) {
            // Currency code not internally generated, need to verify first
            // A currency code must have 3 characters and exist in the main table
            // or in the list of other currencies.
            boolean found = false;
            if (currencyCode.length() != 3) {
                throw new IllegalArgumentException();
            }
            char char1 = currencyCode.charAt(0);
            char char2 = currencyCode.charAt(1);
            int tableEntry = getMainTableEntry(char1, char2);
            if ((tableEntry & COUNTRY_TYPE_MASK) == SIMPLE_CASE_COUNTRY_MASK
                    && tableEntry != INVALID_COUNTRY_ENTRY
                    && currencyCode.charAt(2) - 'A' == (tableEntry & SIMPLE_CASE_COUNTRY_FINAL_CHAR_MASK)) {
                defaultFractionDigits = (tableEntry & SIMPLE_CASE_COUNTRY_DEFAULT_DIGITS_MASK) >> SIMPLE_CASE_COUNTRY_DEFAULT_DIGITS_SHIFT;
                numericCode = (tableEntry & NUMERIC_CODE_MASK) >> NUMERIC_CODE_SHIFT;
                found = true;
            } else { //special case
                int[] fractionAndNumericCode = SpecialCaseEntry.findEntry(currencyCode);
                if (fractionAndNumericCode != null) {
                    defaultFractionDigits = fractionAndNumericCode[0];
                    numericCode = fractionAndNumericCode[1];
                    found = true;
                }
            }

            if (!found) {
                OtherCurrencyEntry ocEntry = OtherCurrencyEntry.findEntry(currencyCode);
                if (ocEntry == null) {
                    throw new IllegalArgumentException();
                }
                defaultFractionDigits = ocEntry.fraction;
                numericCode = ocEntry.numericCode;
            }
        }

        Currency currencyVal =
            new Currency(currencyCode, defaultFractionDigits, numericCode);
        instance = instances.putIfAbsent(currencyCode, currencyVal);
        return (instance != null ? instance : currencyVal);
    }

    Returns the Currency instance for the country of the
given locale. The language and variant components of the locale
are ignored. The result may vary over time, as countries change their
currencies. For example, for the original member countries of the
European Monetary Union, the method returns the old national currencies
until December 31, 2001, and the Euro from January 1, 2002, local time
of the respective countries.
 If the specified locale contains "cu" and/or "rg" Unicode extensions,
the instance returned from this method reflects
the values specified with those extensions. If both "cu" and "rg" are
specified, the currency from the "cu" extension supersedes the implicit one
from the "rg" extension.

The method returns null for territories that don't
have a currency, such as Antarctica.
Params: locale – the locale for whose country a Currency
instance is needed
Throws: NullPointerException – if locale is null
IllegalArgumentException – if the country of the given locale is not a supported ISO 3166 country code.
Returns: the Currency instance for the country of the given locale, or null/**
     * Returns the <code>Currency</code> instance for the country of the
     * given locale. The language and variant components of the locale
     * are ignored. The result may vary over time, as countries change their
     * currencies. For example, for the original member countries of the
     * European Monetary Union, the method returns the old national currencies
     * until December 31, 2001, and the Euro from January 1, 2002, local time
     * of the respective countries.
     * <p>
     * If the specified {@code locale} contains "cu" and/or "rg"
     * <a href="./Locale.html#def_locale_extension">Unicode extensions</a>,
     * the instance returned from this method reflects
     * the values specified with those extensions. If both "cu" and "rg" are
     * specified, the currency from the "cu" extension supersedes the implicit one
     * from the "rg" extension.
     * <p>
     * The method returns <code>null</code> for territories that don't
     * have a currency, such as Antarctica.
     *
     * @param locale the locale for whose country a <code>Currency</code>
     * instance is needed
     * @return the <code>Currency</code> instance for the country of the given
     * locale, or {@code null}
     * @exception NullPointerException if <code>locale</code>
     * is {@code null}
     * @exception IllegalArgumentException if the country of the given {@code locale}
     * is not a supported ISO 3166 country code.
     */
    public static Currency getInstance(Locale locale) {
        // check for locale overrides
        String override = locale.getUnicodeLocaleType("cu");
        if (override != null) {
            try {
                return getInstance(override.toUpperCase(Locale.ROOT));
            } catch (IllegalArgumentException iae) {
                // override currency is invalid. Fall through.
            }
        }

        String country = CalendarDataUtility.findRegionOverride(locale).getCountry();

        if (country == null || !country.matches("^[a-zA-Z]{2}$")) {
            throw new IllegalArgumentException();
        }

        char char1 = country.charAt(0);
        char char2 = country.charAt(1);
        int tableEntry = getMainTableEntry(char1, char2);
        if ((tableEntry & COUNTRY_TYPE_MASK) == SIMPLE_CASE_COUNTRY_MASK
                    && tableEntry != INVALID_COUNTRY_ENTRY) {
            char finalChar = (char) ((tableEntry & SIMPLE_CASE_COUNTRY_FINAL_CHAR_MASK) + 'A');
            int defaultFractionDigits = (tableEntry & SIMPLE_CASE_COUNTRY_DEFAULT_DIGITS_MASK) >> SIMPLE_CASE_COUNTRY_DEFAULT_DIGITS_SHIFT;
            int numericCode = (tableEntry & NUMERIC_CODE_MASK) >> NUMERIC_CODE_SHIFT;
            StringBuilder sb = new StringBuilder(country);
            sb.append(finalChar);
            return getInstance(sb.toString(), defaultFractionDigits, numericCode);
        } else {
            // special cases
            if (tableEntry == INVALID_COUNTRY_ENTRY) {
                throw new IllegalArgumentException();
            }
            if (tableEntry == COUNTRY_WITHOUT_CURRENCY_ENTRY) {
                return null;
            } else {
                int index = SpecialCaseEntry.toIndex(tableEntry);
                SpecialCaseEntry scEntry = specialCasesList.get(index);
                if (scEntry.cutOverTime == Long.MAX_VALUE
                        || System.currentTimeMillis() < scEntry.cutOverTime) {
                    return getInstance(scEntry.oldCurrency,
                            scEntry.oldCurrencyFraction,
                            scEntry.oldCurrencyNumericCode);
                } else {
                    return getInstance(scEntry.newCurrency,
                            scEntry.newCurrencyFraction,
                            scEntry.newCurrencyNumericCode);
                }
            }
        }
    }

    Gets the set of available currencies.  The returned set of currencies
contains all of the available currencies, which may include currencies
that represent obsolete ISO 4217 codes.  The set can be modified
without affecting the available currencies in the runtime.
Returns: the set of available currencies.  If there is no currency
   available in the runtime, the returned set is empty.
Since: 1.7/**
     * Gets the set of available currencies.  The returned set of currencies
     * contains all of the available currencies, which may include currencies
     * that represent obsolete ISO 4217 codes.  The set can be modified
     * without affecting the available currencies in the runtime.
     *
     * @return the set of available currencies.  If there is no currency
     *    available in the runtime, the returned set is empty.
     * @since 1.7
     */
    public static Set<Currency> getAvailableCurrencies() {
        synchronized(Currency.class) {
            if (available == null) {
                available = new HashSet<>(256);

                // Add simple currencies first
                for (char c1 = 'A'; c1 <= 'Z'; c1 ++) {
                    for (char c2 = 'A'; c2 <= 'Z'; c2 ++) {
                        int tableEntry = getMainTableEntry(c1, c2);
                        if ((tableEntry & COUNTRY_TYPE_MASK) == SIMPLE_CASE_COUNTRY_MASK
                             && tableEntry != INVALID_COUNTRY_ENTRY) {
                            char finalChar = (char) ((tableEntry & SIMPLE_CASE_COUNTRY_FINAL_CHAR_MASK) + 'A');
                            int defaultFractionDigits = (tableEntry & SIMPLE_CASE_COUNTRY_DEFAULT_DIGITS_MASK) >> SIMPLE_CASE_COUNTRY_DEFAULT_DIGITS_SHIFT;
                            int numericCode = (tableEntry & NUMERIC_CODE_MASK) >> NUMERIC_CODE_SHIFT;
                            StringBuilder sb = new StringBuilder();
                            sb.append(c1);
                            sb.append(c2);
                            sb.append(finalChar);
                            available.add(getInstance(sb.toString(), defaultFractionDigits, numericCode));
                        } else if ((tableEntry & COUNTRY_TYPE_MASK) == SPECIAL_CASE_COUNTRY_MASK
                                && tableEntry != INVALID_COUNTRY_ENTRY
                                && tableEntry != COUNTRY_WITHOUT_CURRENCY_ENTRY) {
                            int index = SpecialCaseEntry.toIndex(tableEntry);
                            SpecialCaseEntry scEntry = specialCasesList.get(index);

                            if (scEntry.cutOverTime == Long.MAX_VALUE
                                    || System.currentTimeMillis() < scEntry.cutOverTime) {
                                available.add(getInstance(scEntry.oldCurrency,
                                        scEntry.oldCurrencyFraction,
                                        scEntry.oldCurrencyNumericCode));
                            } else {
                                available.add(getInstance(scEntry.newCurrency,
                                        scEntry.newCurrencyFraction,
                                        scEntry.newCurrencyNumericCode));
                            }
                        }
                    }
                }

                // Now add other currencies
                for (OtherCurrencyEntry entry : otherCurrenciesList) {
                    available.add(getInstance(entry.currencyCode));
                }
            }
        }

        @SuppressWarnings("unchecked")
        Set<Currency> result = (Set<Currency>) available.clone();
        return result;
    }

    Gets the ISO 4217 currency code of this currency.
Returns: the ISO 4217 currency code of this currency./**
     * Gets the ISO 4217 currency code of this currency.
     *
     * @return the ISO 4217 currency code of this currency.
     */
    public String getCurrencyCode() {
        return currencyCode;
    }

    Gets the symbol of this currency for the default DISPLAY locale. For example, for the US Dollar, the symbol is "$" if the default locale is the US, while for other locales it may be "US$". If no symbol can be determined, the ISO 4217 currency code is returned.  If the default DISPLAY locale contains "rg" (region override) Unicode extension,
the symbol returned from this method reflects
the value specified with that extension.
 This is equivalent to calling 
    getSymbol(Locale.getDefault(Locale.Category.DISPLAY)). 
Returns: the symbol of this currency for the default DISPLAY locale/**
     * Gets the symbol of this currency for the default
     * {@link Locale.Category#DISPLAY DISPLAY} locale.
     * For example, for the US Dollar, the symbol is "$" if the default
     * locale is the US, while for other locales it may be "US$". If no
     * symbol can be determined, the ISO 4217 currency code is returned.
     * <p>
     * If the default {@link Locale.Category#DISPLAY DISPLAY} locale
     * contains "rg" (region override)
     * <a href="./Locale.html#def_locale_extension">Unicode extension</a>,
     * the symbol returned from this method reflects
     * the value specified with that extension.
     * <p>
     * This is equivalent to calling
     * {@link #getSymbol(Locale)
     *     getSymbol(Locale.getDefault(Locale.Category.DISPLAY))}.
     *
     * @return the symbol of this currency for the default
     *     {@link Locale.Category#DISPLAY DISPLAY} locale
     */
    public String getSymbol() {
        return getSymbol(Locale.getDefault(Locale.Category.DISPLAY));
    }

    Gets the symbol of this currency for the specified locale.
For example, for the US Dollar, the symbol is "$" if the specified
locale is the US, while for other locales it may be "US$". If no
symbol can be determined, the ISO 4217 currency code is returned.
 If the specified locale contains "rg" (region override) Unicode extension,
the symbol returned from this method reflects
the value specified with that extension.
Params: locale – the locale for which a display name for this currency is
needed
Throws: NullPointerException – if locale is null
Returns: the symbol of this currency for the specified locale/**
     * Gets the symbol of this currency for the specified locale.
     * For example, for the US Dollar, the symbol is "$" if the specified
     * locale is the US, while for other locales it may be "US$". If no
     * symbol can be determined, the ISO 4217 currency code is returned.
     * <p>
     * If the specified {@code locale} contains "rg" (region override)
     * <a href="./Locale.html#def_locale_extension">Unicode extension</a>,
     * the symbol returned from this method reflects
     * the value specified with that extension.
     *
     * @param locale the locale for which a display name for this currency is
     * needed
     * @return the symbol of this currency for the specified locale
     * @exception NullPointerException if <code>locale</code> is null
     */
    public String getSymbol(Locale locale) {
        LocaleServiceProviderPool pool =
            LocaleServiceProviderPool.getPool(CurrencyNameProvider.class);
        locale = CalendarDataUtility.findRegionOverride(locale);
        String symbol = pool.getLocalizedObject(
                                CurrencyNameGetter.INSTANCE,
                                locale, currencyCode, SYMBOL);
        if (symbol != null) {
            return symbol;
        }

        // use currency code as symbol of last resort
        return currencyCode;
    }

    Gets the default number of fraction digits used with this currency.
Note that the number of fraction digits is the same as ISO 4217's
minor unit for the currency.
For example, the default number of fraction digits for the Euro is 2,
while for the Japanese Yen it's 0.
In the case of pseudo-currencies, such as IMF Special Drawing Rights,
-1 is returned.
Returns: the default number of fraction digits used with this currency/**
     * Gets the default number of fraction digits used with this currency.
     * Note that the number of fraction digits is the same as ISO 4217's
     * minor unit for the currency.
     * For example, the default number of fraction digits for the Euro is 2,
     * while for the Japanese Yen it's 0.
     * In the case of pseudo-currencies, such as IMF Special Drawing Rights,
     * -1 is returned.
     *
     * @return the default number of fraction digits used with this currency
    */
    public int getDefaultFractionDigits() {
        return defaultFractionDigits;
    }

    Returns the ISO 4217 numeric code of this currency.
Returns: the ISO 4217 numeric code of this currency
Since: 1.7/**
     * Returns the ISO 4217 numeric code of this currency.
     *
     * @return the ISO 4217 numeric code of this currency
     * @since 1.7
     */
    public int getNumericCode() {
        return numericCode;
    }

    Returns the 3 digit ISO 4217 numeric code of this currency as a String. Unlike getNumericCode(), which returns the numeric code as int, this method always returns the numeric code as a 3 digit string. e.g. a numeric value of 32 would be returned as "032", and a numeric value of 6 would be returned as "006". 
Returns: the 3 digit ISO 4217 numeric code of this currency as a String
Since: 9/**
     * Returns the 3 digit ISO 4217 numeric code of this currency as a {@code String}.
     * Unlike {@link #getNumericCode()}, which returns the numeric code as {@code int},
     * this method always returns the numeric code as a 3 digit string.
     * e.g. a numeric value of 32 would be returned as "032",
     * and a numeric value of 6 would be returned as "006".
     *
     * @return the 3 digit ISO 4217 numeric code of this currency as a {@code String}
     * @since 9
     */
    public String getNumericCodeAsString() {
        /* numeric code could be returned as a 3 digit string simply by using
           String.format("%03d",numericCode); which uses regex to parse the format,
           "%03d" in this case. Parsing a regex gives an extra performance overhead,
           so String.format() approach is avoided in this scenario.
        */
        if (numericCode < 100) {
            StringBuilder sb = new StringBuilder();
            sb.append('0');
            if (numericCode < 10) {
                sb.append('0');
            }
            return sb.append(numericCode).toString();
        }
        return String.valueOf(numericCode);
    }

    Gets the name that is suitable for displaying this currency for the default DISPLAY locale. If there is no suitable display name found for the default locale, the ISO 4217 currency code is returned.  This is equivalent to calling 
    getDisplayName(Locale.getDefault(Locale.Category.DISPLAY)). 
Returns: the display name of this currency for the default DISPLAY locale
Since: 1.7/**
     * Gets the name that is suitable for displaying this currency for
     * the default {@link Locale.Category#DISPLAY DISPLAY} locale.
     * If there is no suitable display name found
     * for the default locale, the ISO 4217 currency code is returned.
     * <p>
     * This is equivalent to calling
     * {@link #getDisplayName(Locale)
     *     getDisplayName(Locale.getDefault(Locale.Category.DISPLAY))}.
     *
     * @return the display name of this currency for the default
     *     {@link Locale.Category#DISPLAY DISPLAY} locale
     * @since 1.7
     */
    public String getDisplayName() {
        return getDisplayName(Locale.getDefault(Locale.Category.DISPLAY));
    }

    Gets the name that is suitable for displaying this currency for
the specified locale.  If there is no suitable display name found
for the specified locale, the ISO 4217 currency code is returned.
Params: locale – the locale for which a display name for this currency is
needed
Throws: NullPointerException – if locale is null
Returns: the display name of this currency for the specified locale
Since: 1.7/**
     * Gets the name that is suitable for displaying this currency for
     * the specified locale.  If there is no suitable display name found
     * for the specified locale, the ISO 4217 currency code is returned.
     *
     * @param locale the locale for which a display name for this currency is
     * needed
     * @return the display name of this currency for the specified locale
     * @exception NullPointerException if <code>locale</code> is null
     * @since 1.7
     */
    public String getDisplayName(Locale locale) {
        LocaleServiceProviderPool pool =
            LocaleServiceProviderPool.getPool(CurrencyNameProvider.class);
        String result = pool.getLocalizedObject(
                                CurrencyNameGetter.INSTANCE,
                                locale, currencyCode, DISPLAYNAME);
        if (result != null) {
            return result;
        }

        // use currency code as symbol of last resort
        return currencyCode;
    }

    Returns the ISO 4217 currency code of this currency.
Returns: the ISO 4217 currency code of this currency/**
     * Returns the ISO 4217 currency code of this currency.
     *
     * @return the ISO 4217 currency code of this currency
     */
    @Override
    public String toString() {
        return currencyCode;
    }

    Resolves instances being deserialized to a single instance per currency.
/**
     * Resolves instances being deserialized to a single instance per currency.
     */
    private Object readResolve() {
        return getInstance(currencyCode);
    }

    Gets the main table entry for the country whose country code consists
of char1 and char2.
/**
     * Gets the main table entry for the country whose country code consists
     * of char1 and char2.
     */
    private static int getMainTableEntry(char char1, char char2) {
        if (char1 < 'A' || char1 > 'Z' || char2 < 'A' || char2 > 'Z') {
            throw new IllegalArgumentException();
        }
        return mainTable[(char1 - 'A') * A_TO_Z + (char2 - 'A')];
    }

    Sets the main table entry for the country whose country code consists
of char1 and char2.
/**
     * Sets the main table entry for the country whose country code consists
     * of char1 and char2.
     */
    private static void setMainTableEntry(char char1, char char2, int entry) {
        if (char1 < 'A' || char1 > 'Z' || char2 < 'A' || char2 > 'Z') {
            throw new IllegalArgumentException();
        }
        mainTable[(char1 - 'A') * A_TO_Z + (char2 - 'A')] = entry;
    }

    Obtains a localized currency names from a CurrencyNameProvider
implementation.
/**
     * Obtains a localized currency names from a CurrencyNameProvider
     * implementation.
     */
    private static class CurrencyNameGetter
        implements LocaleServiceProviderPool.LocalizedObjectGetter<CurrencyNameProvider,
                                                                   String> {
        private static final CurrencyNameGetter INSTANCE = new CurrencyNameGetter();

        @Override
        public String getObject(CurrencyNameProvider currencyNameProvider,
                                Locale locale,
                                String key,
                                Object... params) {
            assert params.length == 1;
            int type = (Integer)params[0];

            switch(type) {
            case SYMBOL:
                return currencyNameProvider.getSymbol(key, locale);
            case DISPLAYNAME:
                return currencyNameProvider.getDisplayName(key, locale);
            default:
                assert false; // shouldn't happen
            }

            return null;
        }
    }

    private static int[] readIntArray(DataInputStream dis, int count) throws IOException {
        int[] ret = new int[count];
        for (int i = 0; i < count; i++) {
            ret[i] = dis.readInt();
        }

        return ret;
    }

    private static List<SpecialCaseEntry> readSpecialCases(DataInputStream dis,
            int count)
            throws IOException {

        List<SpecialCaseEntry> list = new ArrayList<>(count);
        long cutOverTime;
        String oldCurrency;
        String newCurrency;
        int oldCurrencyFraction;
        int newCurrencyFraction;
        int oldCurrencyNumericCode;
        int newCurrencyNumericCode;

        for (int i = 0; i < count; i++) {
            cutOverTime = dis.readLong();
            oldCurrency = dis.readUTF();
            newCurrency = dis.readUTF();
            oldCurrencyFraction = dis.readInt();
            newCurrencyFraction = dis.readInt();
            oldCurrencyNumericCode = dis.readInt();
            newCurrencyNumericCode = dis.readInt();
            SpecialCaseEntry sc = new SpecialCaseEntry(cutOverTime,
                    oldCurrency, newCurrency,
                    oldCurrencyFraction, newCurrencyFraction,
                    oldCurrencyNumericCode, newCurrencyNumericCode);
            list.add(sc);
        }
        return list;
    }

    private static List<OtherCurrencyEntry> readOtherCurrencies(DataInputStream dis,
            int count)
            throws IOException {

        List<OtherCurrencyEntry> list = new ArrayList<>(count);
        String currencyCode;
        int fraction;
        int numericCode;

        for (int i = 0; i < count; i++) {
            currencyCode = dis.readUTF();
            fraction = dis.readInt();
            numericCode = dis.readInt();
            OtherCurrencyEntry oc = new OtherCurrencyEntry(currencyCode,
                    fraction,
                    numericCode);
            list.add(oc);
        }
        return list;
    }

    Parse currency data found in the properties file (that
java.util.currency.data designates) to a List of CurrencyProperty
instances. Also, remove invalid entries and the multiple currency
code inconsistencies.
Params: props – properties containing currency data
pattern – regex pattern for the properties entry
Returns: list of parsed property entries/**
     * Parse currency data found in the properties file (that
     * java.util.currency.data designates) to a List of CurrencyProperty
     * instances. Also, remove invalid entries and the multiple currency
     * code inconsistencies.
     *
     * @param props properties containing currency data
     * @param pattern regex pattern for the properties entry
     * @return list of parsed property entries
     */
    private static List<CurrencyProperty> getValidCurrencyData(Properties props,
            Pattern pattern) {

        Set<String> keys = props.stringPropertyNames();
        List<CurrencyProperty> propertyEntries = new ArrayList<>();

        // remove all invalid entries and parse all valid currency properties
        // entries to a group of CurrencyProperty, classified by currency code
        Map<String, List<CurrencyProperty>> currencyCodeGroup = keys.stream()
                .map(k -> CurrencyProperty
                .getValidEntry(k.toUpperCase(Locale.ROOT),
                        props.getProperty(k).toUpperCase(Locale.ROOT),
                        pattern)).flatMap(o -> o.stream())
                .collect(Collectors.groupingBy(entry -> entry.currencyCode));

        // check each group for inconsistencies
        currencyCodeGroup.forEach((curCode, list) -> {
            boolean inconsistent = CurrencyProperty
                    .containsInconsistentInstances(list);
            if (inconsistent) {
                list.forEach(prop -> CurrencyProperty.info("The property"
                        + " entry for " + prop.country + " is inconsistent."
                        + " Ignored.", null));
            } else {
                propertyEntries.addAll(list);
            }
        });

        return propertyEntries;
    }

    Replaces currency data found in the properties file that
java.util.currency.data designates. This method is invoked for
each valid currency entry.
Params: prop – CurrencyProperty instance of the valid property entry/**
     * Replaces currency data found in the properties file that
     * java.util.currency.data designates. This method is invoked for
     * each valid currency entry.
     *
     * @param prop CurrencyProperty instance of the valid property entry
     */
    private static void replaceCurrencyData(CurrencyProperty prop) {


        String ctry = prop.country;
        String code = prop.currencyCode;
        int numeric = prop.numericCode;
        int fraction = prop.fraction;
        int entry = numeric << NUMERIC_CODE_SHIFT;

        int index = SpecialCaseEntry.indexOf(code, fraction, numeric);


        // If a new entry changes the numeric code/dfd of an existing
        // currency code, update it in the sc list at the respective
        // index and also change it in the other currencies list and
        // main table (if that currency code is also used as a
        // simple case).

        // If all three components do not match with the new entry,
        // but the currency code exists in the special case list
        // update the sc entry with the new entry
        int scCurrencyCodeIndex = -1;
        if (index == -1) {
            scCurrencyCodeIndex = SpecialCaseEntry.currencyCodeIndex(code);
            if (scCurrencyCodeIndex != -1) {
                //currency code exists in sc list, then update the old entry
                specialCasesList.set(scCurrencyCodeIndex,
                        new SpecialCaseEntry(code, fraction, numeric));

                // also update the entry in other currencies list
                OtherCurrencyEntry oe = OtherCurrencyEntry.findEntry(code);
                if (oe != null) {
                    int oIndex = otherCurrenciesList.indexOf(oe);
                    otherCurrenciesList.set(oIndex, new OtherCurrencyEntry(
                            code, fraction, numeric));
                }
            }
        }

        /* If a country switches from simple case to special case or
         * one special case to other special case which is not present
         * in the sc arrays then insert the new entry in special case arrays.
         * If an entry with given currency code exists, update with the new
         * entry.
         */
        if (index == -1 && (ctry.charAt(0) != code.charAt(0)
                || ctry.charAt(1) != code.charAt(1))) {

            if(scCurrencyCodeIndex == -1) {
                specialCasesList.add(new SpecialCaseEntry(code, fraction,
                        numeric));
                index = specialCasesList.size() - 1;
            } else {
                index = scCurrencyCodeIndex;
            }

            // update the entry in main table if it exists as a simple case
            updateMainTableEntry(code, fraction, numeric);
        }

        if (index == -1) {
            // simple case
            entry |= (fraction << SIMPLE_CASE_COUNTRY_DEFAULT_DIGITS_SHIFT)
                    | (code.charAt(2) - 'A');
        } else {
            // special case
            entry = SPECIAL_CASE_COUNTRY_MASK
                    | (index + SPECIAL_CASE_COUNTRY_INDEX_DELTA);
        }
        setMainTableEntry(ctry.charAt(0), ctry.charAt(1), entry);
    }

    // update the entry in maintable for any simple case found, if a new
    // entry as a special case updates the entry in sc list with
    // existing currency code
    private static void updateMainTableEntry(String code, int fraction,
            int numeric) {
        // checking the existence of currency code in mainTable
        int tableEntry = getMainTableEntry(code.charAt(0), code.charAt(1));
        int entry = numeric << NUMERIC_CODE_SHIFT;
        if ((tableEntry & COUNTRY_TYPE_MASK) == SIMPLE_CASE_COUNTRY_MASK
                && tableEntry != INVALID_COUNTRY_ENTRY
                && code.charAt(2) - 'A' == (tableEntry
                & SIMPLE_CASE_COUNTRY_FINAL_CHAR_MASK)) {

            int numericCode = (tableEntry & NUMERIC_CODE_MASK)
                    >> NUMERIC_CODE_SHIFT;
            int defaultFractionDigits = (tableEntry
                    & SIMPLE_CASE_COUNTRY_DEFAULT_DIGITS_MASK)
                    >> SIMPLE_CASE_COUNTRY_DEFAULT_DIGITS_SHIFT;
            if (numeric != numericCode || fraction != defaultFractionDigits) {
                // update the entry in main table
                entry |= (fraction << SIMPLE_CASE_COUNTRY_DEFAULT_DIGITS_SHIFT)
                        | (code.charAt(2) - 'A');
                setMainTableEntry(code.charAt(0), code.charAt(1), entry);
            }
        }
    }

    /* Used to represent a special case currency entry
     * - cutOverTime: cut-over time in millis as returned by
     *   System.currentTimeMillis for special case countries that are changing
     *   currencies; Long.MAX_VALUE for countries that are not changing currencies
     * - oldCurrency: old currencies for special case countries
     * - newCurrency: new currencies for special case countries that are
     *   changing currencies; null for others
     * - oldCurrencyFraction: default fraction digits for old currencies
     * - newCurrencyFraction: default fraction digits for new currencies, 0 for
     *   countries that are not changing currencies
     * - oldCurrencyNumericCode: numeric code for old currencies
     * - newCurrencyNumericCode: numeric code for new currencies, 0 for countries
     *   that are not changing currencies
    */
    private static class SpecialCaseEntry {

        final private long cutOverTime;
        final private String oldCurrency;
        final private String newCurrency;
        final private int oldCurrencyFraction;
        final private int newCurrencyFraction;
        final private int oldCurrencyNumericCode;
        final private int newCurrencyNumericCode;

        private SpecialCaseEntry(long cutOverTime, String oldCurrency, String newCurrency,
                int oldCurrencyFraction, int newCurrencyFraction,
                int oldCurrencyNumericCode, int newCurrencyNumericCode) {
            this.cutOverTime = cutOverTime;
            this.oldCurrency = oldCurrency;
            this.newCurrency = newCurrency;
            this.oldCurrencyFraction = oldCurrencyFraction;
            this.newCurrencyFraction = newCurrencyFraction;
            this.oldCurrencyNumericCode = oldCurrencyNumericCode;
            this.newCurrencyNumericCode = newCurrencyNumericCode;
        }

        private SpecialCaseEntry(String currencyCode, int fraction,
                int numericCode) {
            this(Long.MAX_VALUE, currencyCode, "", fraction, 0, numericCode, 0);
        }

        //get the index of the special case entry
        private static int indexOf(String code, int fraction, int numeric) {
            int size = specialCasesList.size();
            for (int index = 0; index < size; index++) {
                SpecialCaseEntry scEntry = specialCasesList.get(index);
                if (scEntry.oldCurrency.equals(code)
                        && scEntry.oldCurrencyFraction == fraction
                        && scEntry.oldCurrencyNumericCode == numeric
                        && scEntry.cutOverTime == Long.MAX_VALUE) {
                    return index;
                }
            }
            return -1;
        }

        // get the fraction and numericCode of the sc currencycode
        private static int[] findEntry(String code) {
            int[] fractionAndNumericCode = null;
            int size = specialCasesList.size();
            for (int index = 0; index < size; index++) {
                SpecialCaseEntry scEntry = specialCasesList.get(index);
                if (scEntry.oldCurrency.equals(code) && (scEntry.cutOverTime == Long.MAX_VALUE
                        || System.currentTimeMillis() < scEntry.cutOverTime)) {
                    //consider only when there is no new currency or cutover time is not passed
                    fractionAndNumericCode = new int[2];
                    fractionAndNumericCode[0] = scEntry.oldCurrencyFraction;
                    fractionAndNumericCode[1] = scEntry.oldCurrencyNumericCode;
                    break;
                } else if (scEntry.newCurrency.equals(code)
                        && System.currentTimeMillis() >= scEntry.cutOverTime) {
                    //consider only if the cutover time is passed
                    fractionAndNumericCode = new int[2];
                    fractionAndNumericCode[0] = scEntry.newCurrencyFraction;
                    fractionAndNumericCode[1] = scEntry.newCurrencyNumericCode;
                    break;
                }
            }
            return fractionAndNumericCode;
        }

        // get the index based on currency code
        private static int currencyCodeIndex(String code) {
            int size = specialCasesList.size();
            for (int index = 0; index < size; index++) {
                SpecialCaseEntry scEntry = specialCasesList.get(index);
                if (scEntry.oldCurrency.equals(code) && (scEntry.cutOverTime == Long.MAX_VALUE
                        || System.currentTimeMillis() < scEntry.cutOverTime)) {
                    //consider only when there is no new currency or cutover time is not passed
                    return index;
                } else if (scEntry.newCurrency.equals(code)
                        && System.currentTimeMillis() >= scEntry.cutOverTime) {
                    //consider only if the cutover time is passed
                    return index;
                }
            }
            return -1;
        }


        // convert the special case entry to sc arrays index
        private static int toIndex(int tableEntry) {
            return (tableEntry & SPECIAL_CASE_COUNTRY_INDEX_MASK) - SPECIAL_CASE_COUNTRY_INDEX_DELTA;
        }

    }

    /* Used to represent Other currencies
     * - currencyCode: currency codes that are not the main currency
     *   of a simple country
     * - otherCurrenciesDFD: decimal format digits for other currencies
     * - otherCurrenciesNumericCode: numeric code for other currencies
     */
    private static class OtherCurrencyEntry {

        final private String currencyCode;
        final private int fraction;
        final private int numericCode;

        private OtherCurrencyEntry(String currencyCode, int fraction,
                int numericCode) {
            this.currencyCode = currencyCode;
            this.fraction = fraction;
            this.numericCode = numericCode;
        }

        //get the instance of the other currency code
        private static OtherCurrencyEntry findEntry(String code) {
            int size = otherCurrenciesList.size();
            for (int index = 0; index < size; index++) {
                OtherCurrencyEntry ocEntry = otherCurrenciesList.get(index);
                if (ocEntry.currencyCode.equalsIgnoreCase(code)) {
                    return ocEntry;
                }
            }
            return null;
        }

    }


    /*
     * Used to represent an entry of the properties file that
     * java.util.currency.data designates
     *
     * - country: country representing the currency entry
     * - currencyCode: currency code
     * - fraction: default fraction digit
     * - numericCode: numeric code
     * - date: cutover date
     */
    private static class CurrencyProperty {
        final private String country;
        final private String currencyCode;
        final private int fraction;
        final private int numericCode;
        final private String date;

        private CurrencyProperty(String country, String currencyCode,
                int fraction, int numericCode, String date) {
            this.country = country;
            this.currencyCode = currencyCode;
            this.fraction = fraction;
            this.numericCode = numericCode;
            this.date = date;
        }

        Check the valid currency data and create/return an Optional instance
of CurrencyProperty
Params: ctry –    country representing the currency data
curData – currency data of the given ctry
pattern – regex pattern for the properties entry
Returns: Optional containing CurrencyProperty instance, If valid;
        empty otherwise/**
         * Check the valid currency data and create/return an Optional instance
         * of CurrencyProperty
         *
         * @param ctry    country representing the currency data
         * @param curData currency data of the given {@code ctry}
         * @param pattern regex pattern for the properties entry
         * @return Optional containing CurrencyProperty instance, If valid;
         *         empty otherwise
         */
        private static Optional<CurrencyProperty> getValidEntry(String ctry,
                String curData,
                Pattern pattern) {

            CurrencyProperty prop = null;

            if (ctry.length() != 2) {
                // Invalid country code. Ignore the entry.
            } else {

                prop = parseProperty(ctry, curData, pattern);
                // if the property entry failed any of the below checked
                // criteria it is ignored
                if (prop == null
                        || (prop.date == null && curData.chars()
                                .map(c -> c == ',' ? 1 : 0).sum() >= 3)) {
                    // format is not recognized.  ignore the data if date
                    // string is null and we've 4 values, bad date value
                    prop = null;
                } else if (prop.fraction
                        > SIMPLE_CASE_COUNTRY_MAX_DEFAULT_DIGITS) {
                    prop = null;
                } else {
                    try {
                        if (prop.date != null
                                && !isPastCutoverDate(prop.date)) {
                            prop = null;
                        }
                    } catch (ParseException ex) {
                        prop = null;
                    }
                }
            }

            if (prop == null) {
                info("The property entry for " + ctry + " is invalid."
                        + " Ignored.", null);
            }

            return Optional.ofNullable(prop);
        }

        /*
         * Parse properties entry and return CurrencyProperty instance
         */
        private static CurrencyProperty parseProperty(String ctry,
                String curData, Pattern pattern) {
            Matcher m = pattern.matcher(curData);
            if (!m.find()) {
                return null;
            } else {
                return new CurrencyProperty(ctry, m.group(1),
                        Integer.parseInt(m.group(3)),
                        Integer.parseInt(m.group(2)), m.group(4));
            }
        }

        Checks if the given list contains multiple inconsistent currency instances
/**
         * Checks if the given list contains multiple inconsistent currency instances
         */
        private static boolean containsInconsistentInstances(
                List<CurrencyProperty> list) {
            int numCode = list.get(0).numericCode;
            int fractionDigit = list.get(0).fraction;
            return list.stream().anyMatch(prop -> prop.numericCode != numCode
                    || prop.fraction != fractionDigit);
        }

        private static boolean isPastCutoverDate(String s)
                throws ParseException {
            SimpleDateFormat format = new SimpleDateFormat(
                    "yyyy-MM-dd'T'HH:mm:ss", Locale.ROOT);
            format.setTimeZone(TimeZone.getTimeZone("UTC"));
            format.setLenient(false);
            long time = format.parse(s.trim()).getTime();
            return System.currentTimeMillis() > time;

        }

        private static void info(String message, Throwable t) {
            PlatformLogger logger = PlatformLogger
                    .getLogger("java.util.Currency");
            if (logger.isLoggable(PlatformLogger.Level.INFO)) {
                if (t != null) {
                    logger.info(message, t);
                } else {
                    logger.info(message);
                }
            }
        }

    }

}
Params:	currencyCode – the ISO 4217 code of the currency
Throws:	NullPointerException – if `currencyCode` is null IllegalArgumentException – if `currencyCode` is not a supported ISO 4217 code.
Returns:	the `Currency` instance for the given currency code
Params:	locale – the locale for whose country a `Currency` instance is needed
Throws:	NullPointerException – if `locale` is `null` IllegalArgumentException – if the country of the given `locale` is not a supported ISO 3166 country code.
Returns:	the `Currency` instance for the country of the given locale, or `null`
Returns:	the set of available currencies. If there is no currency available in the runtime, the returned set is empty.
Since:	1.7
Params:	locale – the locale for which a display name for this currency is needed
Throws:	NullPointerException – if `locale` is null
Returns:	the symbol of this currency for the specified locale
Returns:	the 3 digit ISO 4217 numeric code of this currency as a `String`
Since:	9
Returns:	the display name of this currency for the default `DISPLAY` locale
Since:	1.7
Params:	props – properties containing currency data pattern – regex pattern for the properties entry
Returns:	list of parsed property entries
Params:	ctry – country representing the currency data curData – currency data of the given `ctry` pattern – regex pattern for the properties entry
Returns:	Optional containing CurrencyProperty instance, If valid; empty otherwise
/

java/ 11/ java.base/java/util/Currency.java
