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8347949: Currency method to stream available Currencies

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Reviewed-by: naoto, liach, rriggs
This commit is contained in:
Justin Lu 2025-01-30 17:55:47 +00:00
parent cc775b1620
commit f05c53c2c4
2 changed files with 120 additions and 43 deletions
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108
src/java.base/share/classes/java/util/Currency.java
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@ -40,6 +40,7 @@ import java.util.regex.Pattern;
import java.util.regex.Matcher;
import java.util.spi.CurrencyNameProvider;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import jdk.internal.util.StaticProperty;
import sun.util.locale.provider.CalendarDataUtility;
@ -432,61 +433,82 @@ public final class Currency implements Serializable {
}
/**
* 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
* {@return a set of available currencies} The returned set of currencies
* contains all the available currencies, which may include currencies
* that represent obsolete ISO 4217 codes. If there is no currency available
* in the runtime, the returned set is empty. 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.
* @apiNote Consider using {@link #availableCurrencies()} which returns
* a stream of the available currencies.
* @see #availableCurrencies()
* @since 1.7
*/
public static Set<Currency> getAvailableCurrencies() {
synchronized(Currency.class) {
if (available == null) {
var sysTime = System.currentTimeMillis();
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);
return new HashSet<>(getCurrencies());
}
if (scEntry.cutOverTime == Long.MAX_VALUE
|| sysTime < scEntry.cutOverTime) {
available.add(getInstance(scEntry.oldCurrency,
scEntry.oldCurrencyFraction,
scEntry.oldCurrencyNumericCode));
} else {
available.add(getInstance(scEntry.newCurrency,
scEntry.newCurrencyFraction,
scEntry.newCurrencyNumericCode));
}
/**
* {@return a stream of available currencies} The returned stream of currencies
* contains all the available currencies, which may include currencies
* that represent obsolete ISO 4217 codes. If there is no currency
* available in the runtime, the returned stream is empty.
*
* @implNote Unlike {@link #getAvailableCurrencies()}, this method does
* not create a defensive copy of the {@code Currency} set.
* @see #getAvailableCurrencies()
* @since 25
*/
public static Stream<Currency> availableCurrencies() {
return getCurrencies().stream();
}
// Returns the set of available Currencies which are lazily initialized
private static synchronized HashSet<Currency> getCurrencies() {
if (available == null) {
var sysTime = System.currentTimeMillis();
available = HashSet.newHashSet(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
|| sysTime < 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));
}
// Now add other currencies
for (OtherCurrencyEntry entry : otherCurrenciesList) {
available.add(getInstance(entry.currencyCode));
}
}
return new HashSet<>(available);
return available;
}
/**