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/**
*******************************************************************************
* Copyright (C) 2001-2016, International Business Machines Corporation and
* others. All Rights Reserved.
*******************************************************************************
*/
package com.ibm.icu.util;
import java.io.ObjectStreamException;
import java.lang.ref.SoftReference;
import java.text.ParsePosition;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.MissingResourceException;
import java.util.Set;
import com.ibm.icu.impl.ICUCache;
import com.ibm.icu.impl.ICUDebug;
import com.ibm.icu.impl.ICUResourceBundle;
import com.ibm.icu.impl.SimpleCache;
import com.ibm.icu.impl.TextTrieMap;
import com.ibm.icu.text.CurrencyDisplayNames;
import com.ibm.icu.text.CurrencyMetaInfo;
import com.ibm.icu.text.CurrencyMetaInfo.CurrencyDigits;
import com.ibm.icu.text.CurrencyMetaInfo.CurrencyFilter;
import com.ibm.icu.util.ULocale.Category;
/**
* A class encapsulating a currency, as defined by ISO 4217. A
* Currency object can be created given a Locale or
* given an ISO 4217 code. Once created, the Currency object
* can return various data necessary to its proper display:
*
* - A display symbol, for a specific locale
*
- The number of fraction digits to display
*
- A rounding increment
*
*
* The DecimalFormat class uses these data to display
* currencies.
*
* Note: This class deliberately resembles
* java.util.Currency but it has a completely independent
* implementation, and adds features not present in the JDK.
* @author Alan Liu
* @stable ICU 2.2
*/
public class Currency extends MeasureUnit {
private static final long serialVersionUID = -5839973855554750484L;
private static final boolean DEBUG = ICUDebug.enabled("currency");
// Cache to save currency name trie
private static ICUCache>> CURRENCY_NAME_CACHE =
new SimpleCache>>();
/**
* Selector for getName() indicating a symbolic name for a
* currency, such as "$" for USD.
* @stable ICU 2.6
*/
public static final int SYMBOL_NAME = 0;
/**
* Selector for getName() indicating the long name for a
* currency, such as "US Dollar" for USD.
* @stable ICU 2.6
*/
public static final int LONG_NAME = 1;
/**
* Selector for getName() indicating the plural long name for a
* currency, such as "US dollar" for USD in "1 US dollar",
* and "US dollars" for USD in "2 US dollars".
* @stable ICU 4.2
*/
public static final int PLURAL_LONG_NAME = 2;
private static final EquivalenceRelation EQUIVALENT_CURRENCY_SYMBOLS =
new EquivalenceRelation()
.add("\u00a5", "\uffe5")
.add("$", "\ufe69", "\uff04")
.add("\u20a8", "\u20b9")
.add("\u00a3", "\u20a4");
/**
* Currency Usage used for Decimal Format
* @stable ICU 54
*/
public enum CurrencyUsage{
/**
* a setting to specify currency usage which determines currency digit and rounding
* for standard usage, for example: "50.00 NT$"
* @stable ICU 54
*/
STANDARD,
/**
* a setting to specify currency usage which determines currency digit and rounding
* for cash usage, for example: "50 NT$"
* @stable ICU 54
*/
CASH
}
// begin registry stuff
// shim for service code
/* package */ static abstract class ServiceShim {
abstract ULocale[] getAvailableULocales();
abstract Locale[] getAvailableLocales();
abstract Currency createInstance(ULocale l);
abstract Object registerInstance(Currency c, ULocale l);
abstract boolean unregister(Object f);
}
private static ServiceShim shim;
private static ServiceShim getShim() {
// Note: this instantiation is safe on loose-memory-model configurations
// despite lack of synchronization, since the shim instance has no state--
// it's all in the class init. The worst problem is we might instantiate
// two shim instances, but they'll share the same state so that's ok.
if (shim == null) {
try {
Class cls = Class.forName("com.ibm.icu.util.CurrencyServiceShim");
shim = (ServiceShim)cls.newInstance();
}
catch (Exception e) {
if(DEBUG){
e.printStackTrace();
}
throw new RuntimeException(e.getMessage());
}
}
return shim;
}
/**
* Returns a currency object for the default currency in the given
* locale.
* @param locale the locale
* @return the currency object for this locale
* @stable ICU 2.2
*/
public static Currency getInstance(Locale locale) {
return getInstance(ULocale.forLocale(locale));
}
/**
* Returns a currency object for the default currency in the given
* locale.
* @stable ICU 3.2
*/
public static Currency getInstance(ULocale locale) {
String currency = locale.getKeywordValue("currency");
if (currency != null) {
return getInstance(currency);
}
if (shim == null) {
return createCurrency(locale);
}
return shim.createInstance(locale);
}
/**
* Returns an array of Strings which contain the currency
* identifiers that are valid for the given locale on the
* given date. If there are no such identifiers, returns null.
* Returned identifiers are in preference order.
* @param loc the locale for which to retrieve currency codes.
* @param d the date for which to retrieve currency codes for the given locale.
* @return The array of ISO currency codes.
* @stable ICU 4.0
*/
public static String[] getAvailableCurrencyCodes(ULocale loc, Date d) {
String region = ULocale.getRegionForSupplementalData(loc, false);
CurrencyFilter filter = CurrencyFilter.onDate(d).withRegion(region);
List list = getTenderCurrencies(filter);
// Note: Prior to 4.4 the spec didn't say that we return null if there are no results, but
// the test assumed it did. Kept the behavior and amended the spec.
if (list.isEmpty()) {
return null;
}
return list.toArray(new String[list.size()]);
}
/**
* Returns an array of Strings which contain the currency
* identifiers that are valid for the given {@link java.util.Locale} on the
* given date. If there are no such identifiers, returns null.
* Returned identifiers are in preference order.
* @param loc the {@link java.util.Locale} for which to retrieve currency codes.
* @param d the date for which to retrieve currency codes for the given locale.
* @return The array of ISO currency codes.
* @stable ICU 54
*/
public static String[] getAvailableCurrencyCodes(Locale loc, Date d) {
return getAvailableCurrencyCodes(ULocale.forLocale(loc), d);
}
/**
* Returns the set of available currencies. The returned set of currencies contains all of the
* available currencies, including obsolete ones. The result set can be modified without
* affecting the available currencies in the runtime.
*
* @return The set of available currencies. The returned set could be empty if there is no
* currency data available.
*
* @stable ICU 49
*/
public static Set getAvailableCurrencies() {
CurrencyMetaInfo info = CurrencyMetaInfo.getInstance();
List list = info.currencies(CurrencyFilter.all());
HashSet resultSet = new HashSet(list.size());
for (String code : list) {
resultSet.add(getInstance(code));
}
return resultSet;
}
private static final String EUR_STR = "EUR";
private static final ICUCache currencyCodeCache = new SimpleCache();
/**
* Instantiate a currency from resource data.
*/
/* package */ static Currency createCurrency(ULocale loc) {
String variant = loc.getVariant();
if ("EURO".equals(variant)) {
return getInstance(EUR_STR);
}
String code = currencyCodeCache.get(loc);
if (code == null) {
String country = ULocale.getRegionForSupplementalData(loc, false);
CurrencyMetaInfo info = CurrencyMetaInfo.getInstance();
List list = info.currencies(CurrencyFilter.onRegion(country));
if (list.size() > 0) {
code = list.get(0);
boolean isPreEuro = "PREEURO".equals(variant);
if (isPreEuro && EUR_STR.equals(code)) {
if (list.size() < 2) {
return null;
}
code = list.get(1);
}
} else {
return null;
}
currencyCodeCache.put(loc, code);
}
return getInstance(code);
}
/**
* Returns a currency object given an ISO 4217 3-letter code.
* @param theISOCode the iso code
* @return the currency for this iso code
* @throws NullPointerException if theISOCode is null.
* @throws IllegalArgumentException if theISOCode is not a
* 3-letter alpha code.
* @stable ICU 2.2
*/
public static Currency getInstance(String theISOCode) {
if (theISOCode == null) {
throw new NullPointerException("The input currency code is null.");
}
if (!isAlpha3Code(theISOCode)) {
throw new IllegalArgumentException(
"The input currency code is not 3-letter alphabetic code.");
}
return (Currency) MeasureUnit.internalGetInstance("currency", theISOCode.toUpperCase(Locale.ENGLISH));
}
private static boolean isAlpha3Code(String code) {
if (code.length() != 3) {
return false;
} else {
for (int i = 0; i < 3; i++) {
char ch = code.charAt(i);
if (ch < 'A' || (ch > 'Z' && ch < 'a') || ch > 'z') {
return false;
}
}
}
return true;
}
/**
* Registers a new currency for the provided locale. The returned object
* is a key that can be used to unregister this currency object.
*
* Because ICU may choose to cache Currency objects internally, this must
* be called at application startup, prior to any calls to
* Currency.getInstance to avoid undefined behavior.
*
* @param currency the currency to register
* @param locale the ulocale under which to register the currency
* @return a registry key that can be used to unregister this currency
* @see #unregister
* @stable ICU 3.2
*/
public static Object registerInstance(Currency currency, ULocale locale) {
return getShim().registerInstance(currency, locale);
}
/**
* Unregister the currency associated with this key (obtained from
* registerInstance).
* @param registryKey the registry key returned from registerInstance
* @see #registerInstance
* @stable ICU 2.6
*/
public static boolean unregister(Object registryKey) {
if (registryKey == null) {
throw new IllegalArgumentException("registryKey must not be null");
}
if (shim == null) {
return false;
}
return shim.unregister(registryKey);
}
/**
* Return an array of the locales for which a currency
* is defined.
* @return an array of the available locales
* @stable ICU 2.2
*/
public static Locale[] getAvailableLocales() {
if (shim == null) {
return ICUResourceBundle.getAvailableLocales();
} else {
return shim.getAvailableLocales();
}
}
/**
* Return an array of the ulocales for which a currency
* is defined.
* @return an array of the available ulocales
* @stable ICU 3.2
*/
public static ULocale[] getAvailableULocales() {
if (shim == null) {
return ICUResourceBundle.getAvailableULocales();
} else {
return shim.getAvailableULocales();
}
}
// end registry stuff
/**
* Given a key and a locale, returns an array of values for the key for which data
* exists. If commonlyUsed is true, these are the values that typically are used
* with this locale, otherwise these are all values for which data exists.
* This is a common service API.
*
* The only supported key is "currency", other values return an empty array.
*
* Currency information is based on the region of the locale. If the locale does not
* indicate a region, {@link ULocale#addLikelySubtags(ULocale)} is used to infer a region,
* except for the 'und' locale.
*
* If commonlyUsed is true, only the currencies known to be in use as of the current date
* are returned. When there are more than one, these are returned in preference order
* (typically, this occurs when a country is transitioning to a new currency, and the
* newer currency is preferred), see
* Unicode TR#35 Sec. C1.
* If commonlyUsed is false, all currencies ever used in any locale are returned, in no
* particular order.
*
* @param key key whose values to look up. the only recognized key is "currency"
* @param locale the locale
* @param commonlyUsed if true, return only values that are currently used in the locale.
* Otherwise returns all values.
* @return an array of values for the given key and the locale. If there is no data, the
* array will be empty.
* @stable ICU 4.2
*/
public static final String[] getKeywordValuesForLocale(String key, ULocale locale,
boolean commonlyUsed) {
// The only keyword we recognize is 'currency'
if (!"currency".equals(key)) {
return EMPTY_STRING_ARRAY;
}
if (!commonlyUsed) {
// Behavior change from 4.3.3, no longer sort the currencies
return getAllTenderCurrencies().toArray(new String[0]);
}
// Don't resolve region if the requested locale is 'und', it will resolve to US
// which we don't want.
if (UND.equals(locale)) {
return EMPTY_STRING_ARRAY;
}
String prefRegion = ULocale.getRegionForSupplementalData(locale, true);
CurrencyFilter filter = CurrencyFilter.now().withRegion(prefRegion);
// currencies are in region's preferred order when we're filtering on region, which
// matches our spec
List result = getTenderCurrencies(filter);
// No fallback anymore (change from 4.3.3)
if (result.size() == 0) {
return EMPTY_STRING_ARRAY;
}
return result.toArray(new String[result.size()]);
}
private static final ULocale UND = new ULocale("und");
private static final String[] EMPTY_STRING_ARRAY = new String[0];
/**
* Returns the ISO 4217 3-letter code for this currency object.
* @stable ICU 2.2
*/
public String getCurrencyCode() {
return subType;
}
/**
* Returns the ISO 4217 numeric code for this currency object.
* Note: If the ISO 4217 numeric code is not assigned for the currency or
* the currency is unknown, this method returns 0.
* @return The ISO 4217 numeric code of this currency.
* @stable ICU 49
*/
public int getNumericCode() {
int result = 0;
try {
UResourceBundle bundle = UResourceBundle.getBundleInstance(
ICUResourceBundle.ICU_BASE_NAME,
"currencyNumericCodes",
ICUResourceBundle.ICU_DATA_CLASS_LOADER);
UResourceBundle codeMap = bundle.get("codeMap");
UResourceBundle numCode = codeMap.get(subType);
result = numCode.getInt();
} catch (MissingResourceException e) {
// fall through
}
return result;
}
/**
* Convenience and compatibility override of getName that
* requests the symbol name for the default DISPLAY locale.
* @see #getName
* @see Category#DISPLAY
* @stable ICU 3.4
*/
public String getSymbol() {
return getSymbol(ULocale.getDefault(Category.DISPLAY));
}
/**
* Convenience and compatibility override of getName that
* requests the symbol name.
* @param loc the Locale for the symbol
* @see #getName
* @stable ICU 3.4
*/
public String getSymbol(Locale loc) {
return getSymbol(ULocale.forLocale(loc));
}
/**
* Convenience and compatibility override of getName that
* requests the symbol name.
* @param uloc the ULocale for the symbol
* @see #getName
* @stable ICU 3.4
*/
public String getSymbol(ULocale uloc) {
return getName(uloc, SYMBOL_NAME, new boolean[1]);
}
/**
* Returns the display name for the given currency in the
* given locale.
* This is a convenient method for
* getName(ULocale, int, boolean[]);
* @stable ICU 3.2
*/
public String getName(Locale locale,
int nameStyle,
boolean[] isChoiceFormat) {
return getName(ULocale.forLocale(locale), nameStyle, isChoiceFormat);
}
/**
* Returns the display name for the given currency in the
* given locale. For example, the display name for the USD
* currency object in the en_US locale is "$".
* @param locale locale in which to display currency
* @param nameStyle selector for which kind of name to return.
* The nameStyle should be either SYMBOL_NAME or
* LONG_NAME. Otherwise, throw IllegalArgumentException.
* @param isChoiceFormat fill-in; isChoiceFormat[0] is set to true
* if the returned value is a ChoiceFormat pattern; otherwise it
* is set to false
* @return display string for this currency. If the resource data
* contains no entry for this currency, then the ISO 4217 code is
* returned. If isChoiceFormat[0] is true, then the result is a
* ChoiceFormat pattern. Otherwise it is a static string. Note:
* as of ICU 4.4, choice formats are not used, and the value returned
* in isChoiceFormat is always false.
*
* @throws IllegalArgumentException if the nameStyle is not SYMBOL_NAME
* or LONG_NAME.
* @see #getName(ULocale, int, String, boolean[])
* @stable ICU 3.2
*/
public String getName(ULocale locale, int nameStyle, boolean[] isChoiceFormat) {
if (!(nameStyle == SYMBOL_NAME || nameStyle == LONG_NAME)) {
throw new IllegalArgumentException("bad name style: " + nameStyle);
}
// We no longer support choice format data in names. Data should not contain
// choice patterns.
if (isChoiceFormat != null) {
isChoiceFormat[0] = false;
}
CurrencyDisplayNames names = CurrencyDisplayNames.getInstance(locale);
return nameStyle == SYMBOL_NAME ? names.getSymbol(subType) : names.getName(subType);
}
/**
* Returns the display name for the given currency in the given locale.
* This is a convenience overload of getName(ULocale, int, String, boolean[]);
* @stable ICU 4.2
*/
public String getName(Locale locale, int nameStyle, String pluralCount,
boolean[] isChoiceFormat) {
return getName(ULocale.forLocale(locale), nameStyle, pluralCount, isChoiceFormat);
}
/**
* Returns the display name for the given currency in the
* given locale. For example, the SYMBOL_NAME for the USD
* currency object in the en_US locale is "$".
* The PLURAL_LONG_NAME for the USD currency object when the currency
* amount is plural is "US dollars", such as in "3.00 US dollars";
* while the PLURAL_LONG_NAME for the USD currency object when the currency
* amount is singular is "US dollar", such as in "1.00 US dollar".
* @param locale locale in which to display currency
* @param nameStyle selector for which kind of name to return
* @param pluralCount plural count string for this locale
* @param isChoiceFormat fill-in; isChoiceFormat[0] is set to true
* if the returned value is a ChoiceFormat pattern; otherwise it
* is set to false
* @return display string for this currency. If the resource data
* contains no entry for this currency, then the ISO 4217 code is
* returned. If isChoiceFormat[0] is true, then the result is a
* ChoiceFormat pattern. Otherwise it is a static string. Note:
* as of ICU 4.4, choice formats are not used, and the value returned
* in isChoiceFormat is always false.
* @throws IllegalArgumentException if the nameStyle is not SYMBOL_NAME,
* LONG_NAME, or PLURAL_LONG_NAME.
* @stable ICU 4.2
*/
public String getName(ULocale locale, int nameStyle, String pluralCount,
boolean[] isChoiceFormat) {
if (nameStyle != PLURAL_LONG_NAME) {
return getName(locale, nameStyle, isChoiceFormat);
}
// We no longer support choice format
if (isChoiceFormat != null) {
isChoiceFormat[0] = false;
}
CurrencyDisplayNames names = CurrencyDisplayNames.getInstance(locale);
return names.getPluralName(subType, pluralCount);
}
/**
* Returns the display name for this currency in the default locale.
* If the resource data for the default locale contains no entry for this currency,
* then the ISO 4217 code is returned.
*
* Note: This method is a convenience equivalent for
* {@link java.util.Currency#getDisplayName()} and is equivalent to
* getName(Locale.getDefault(), LONG_NAME, null).
*
* @return The display name of this currency
* @see #getDisplayName(Locale)
* @see #getName(Locale, int, boolean[])
* @stable ICU 49
*/
@SuppressWarnings("javadoc") // java.util.Currency#getDisplayName() is introduced in Java 7
public String getDisplayName() {
return getName(Locale.getDefault(), LONG_NAME, null);
}
/**
* Returns the display name for this currency in the given locale.
* If the resource data for the given locale contains no entry for this currency,
* then the ISO 4217 code is returned.
*
* Note: This method is a convenience equivalent for
* {@link java.util.Currency#getDisplayName(java.util.Locale)} and is equivalent
* to getName(locale, LONG_NAME, null).
*
* @param locale locale in which to display currency
* @return The display name of this currency for the specified locale
* @see #getDisplayName(Locale)
* @see #getName(Locale, int, boolean[])
* @stable ICU 49
*/
@SuppressWarnings("javadoc") // java.util.Currency#getDisplayName() is introduced in Java 7
public String getDisplayName(Locale locale) {
return getName(locale, LONG_NAME, null);
}
/**
* Attempt to parse the given string as a currency, either as a
* display name in the given locale, or as a 3-letter ISO 4217
* code. If multiple display names match, then the longest one is
* selected. If both a display name and a 3-letter ISO code
* match, then the display name is preferred, unless it's length
* is less than 3.
*
* @param locale the locale of the display names to match
* @param text the text to parse
* @param type parse against currency type: LONG_NAME only or not
* @param pos input-output position; on input, the position within
* text to match; must have 0 <= pos.getIndex() < text.length();
* on output, the position after the last matched character. If
* the parse fails, the position in unchanged upon output.
* @return the ISO 4217 code, as a string, of the best match, or
* null if there is no match
*
* @internal
* @deprecated This API is ICU internal only.
*/
@Deprecated
public static String parse(ULocale locale, String text, int type, ParsePosition pos) {
List> currencyTrieVec = CURRENCY_NAME_CACHE.get(locale);
if (currencyTrieVec == null) {
TextTrieMap currencyNameTrie =
new TextTrieMap(true);
TextTrieMap currencySymbolTrie =
new TextTrieMap(false);
currencyTrieVec = new ArrayList>();
currencyTrieVec.add(currencySymbolTrie);
currencyTrieVec.add(currencyNameTrie);
setupCurrencyTrieVec(locale, currencyTrieVec);
CURRENCY_NAME_CACHE.put(locale, currencyTrieVec);
}
int maxLength = 0;
String isoResult = null;
// look for the names
TextTrieMap currencyNameTrie = currencyTrieVec.get(1);
CurrencyNameResultHandler handler = new CurrencyNameResultHandler();
currencyNameTrie.find(text, pos.getIndex(), handler);
isoResult = handler.getBestCurrencyISOCode();
maxLength = handler.getBestMatchLength();
if (type != Currency.LONG_NAME) { // not long name only
TextTrieMap currencySymbolTrie = currencyTrieVec.get(0);
handler = new CurrencyNameResultHandler();
currencySymbolTrie.find(text, pos.getIndex(), handler);
if (handler.getBestMatchLength() > maxLength) {
isoResult = handler.getBestCurrencyISOCode();
maxLength = handler.getBestMatchLength();
}
}
int start = pos.getIndex();
pos.setIndex(start + maxLength);
return isoResult;
}
private static void setupCurrencyTrieVec(ULocale locale,
List> trieVec) {
TextTrieMap symTrie = trieVec.get(0);
TextTrieMap trie = trieVec.get(1);
CurrencyDisplayNames names = CurrencyDisplayNames.getInstance(locale);
for (Map.Entry e : names.symbolMap().entrySet()) {
String symbol = e.getKey();
String isoCode = e.getValue();
// Register under not just symbol, but under every equivalent symbol as well
// e.g short width yen and long width yen.
for (String equivalentSymbol : EQUIVALENT_CURRENCY_SYMBOLS.get(symbol)) {
symTrie.put(equivalentSymbol, new CurrencyStringInfo(isoCode, symbol));
}
}
for (Map.Entry e : names.nameMap().entrySet()) {
String name = e.getKey();
String isoCode = e.getValue();
trie.put(name, new CurrencyStringInfo(isoCode, name));
}
}
private static final class CurrencyStringInfo {
private String isoCode;
private String currencyString;
public CurrencyStringInfo(String isoCode, String currencyString) {
this.isoCode = isoCode;
this.currencyString = currencyString;
}
public String getISOCode() {
return isoCode;
}
@SuppressWarnings("unused")
public String getCurrencyString() {
return currencyString;
}
}
private static class CurrencyNameResultHandler
implements TextTrieMap.ResultHandler {
// The length of longest matching key
private int bestMatchLength;
// The currency ISO code of longest matching key
private String bestCurrencyISOCode;
// As the trie is traversed, handlePrefixMatch is called at each node. matchLength is the
// length length of the key at the current node; values is the list of all the values mapped to
// that key. matchLength increases with each call as trie is traversed.
public boolean handlePrefixMatch(int matchLength, Iterator values) {
if (values.hasNext()) {
// Since the best match criteria is only based on length of key in trie and since all the
// values are mapped to the same key, we only need to examine the first value.
bestCurrencyISOCode = values.next().getISOCode();
bestMatchLength = matchLength;
}
return true;
}
public String getBestCurrencyISOCode() {
return bestCurrencyISOCode;
}
public int getBestMatchLength() {
return bestMatchLength;
}
}
/**
* Returns the number of the number of fraction digits that should
* be displayed for this currency.
* This is equivalent to getDefaultFractionDigits(CurrencyUsage.STANDARD);
* @return a non-negative number of fraction digits to be
* displayed
* @stable ICU 2.2
*/
public int getDefaultFractionDigits() {
return getDefaultFractionDigits(CurrencyUsage.STANDARD);
}
/**
* Returns the number of the number of fraction digits that should
* be displayed for this currency with Usage.
* @param Usage the usage of currency(Standard or Cash)
* @return a non-negative number of fraction digits to be
* displayed
* @stable ICU 54
*/
public int getDefaultFractionDigits(CurrencyUsage Usage) {
CurrencyMetaInfo info = CurrencyMetaInfo.getInstance();
CurrencyDigits digits = info.currencyDigits(subType, Usage);
return digits.fractionDigits;
}
/**
* Returns the rounding increment for this currency, or 0.0 if no
* rounding is done by this currency.
* This is equivalent to getRoundingIncrement(CurrencyUsage.STANDARD);
* @return the non-negative rounding increment, or 0.0 if none
* @stable ICU 2.2
*/
public double getRoundingIncrement() {
return getRoundingIncrement(CurrencyUsage.STANDARD);
}
/**
* Returns the rounding increment for this currency, or 0.0 if no
* rounding is done by this currency with the Usage.
* @param Usage the usage of currency(Standard or Cash)
* @return the non-negative rounding increment, or 0.0 if none
* @stable ICU 54
*/
public double getRoundingIncrement(CurrencyUsage Usage) {
CurrencyMetaInfo info = CurrencyMetaInfo.getInstance();
CurrencyDigits digits = info.currencyDigits(subType, Usage);
int data1 = digits.roundingIncrement;
// If there is no rounding return 0.0 to indicate no rounding.
// This is the high-runner case, by far.
if (data1 == 0) {
return 0.0;
}
int data0 = digits.fractionDigits;
// If the meta data is invalid, return 0.0 to indicate no rounding.
if (data0 < 0 || data0 >= POW10.length) {
return 0.0;
}
// Return data[1] / 10^(data[0]). The only actual rounding data,
// as of this writing, is CHF { 2, 25 }.
return (double) data1 / POW10[data0];
}
/**
* Returns the ISO 4217 code for this currency.
* @stable ICU 2.2
*/
public String toString() {
return subType;
}
/**
* Constructs a currency object for the given ISO 4217 3-letter
* code. This constructor assumes that the code is valid.
*
* @param theISOCode The iso code used to construct the currency.
* @stable ICU 3.4
*/
protected Currency(String theISOCode) {
super("currency", theISOCode);
// isoCode is kept for readResolve() and Currency class no longer
// use it. So this statement actually does not have any effect.
isoCode = theISOCode;
}
// POW10[i] = 10^i
private static final int[] POW10 = {
1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000, 1000000000
};
private static SoftReference> ALL_TENDER_CODES;
private static SoftReference> ALL_CODES_AS_SET;
/*
* Returns an unmodifiable String list including all known tender currency codes.
*/
private static synchronized List getAllTenderCurrencies() {
List all = (ALL_TENDER_CODES == null) ? null : ALL_TENDER_CODES.get();
if (all == null) {
// Filter out non-tender currencies which have "from" date set to 9999-12-31
// CurrencyFilter has "to" value set to 9998-12-31 in order to exclude them
//CurrencyFilter filter = CurrencyFilter.onDateRange(null, new Date(253373299200000L));
CurrencyFilter filter = CurrencyFilter.all();
all = Collections.unmodifiableList(getTenderCurrencies(filter));
ALL_TENDER_CODES = new SoftReference>(all);
}
return all;
}
private static synchronized Set getAllCurrenciesAsSet() {
Set all = (ALL_CODES_AS_SET == null) ? null : ALL_CODES_AS_SET.get();
if (all == null) {
CurrencyMetaInfo info = CurrencyMetaInfo.getInstance();
all = Collections.unmodifiableSet(
new HashSet(info.currencies(CurrencyFilter.all())));
ALL_CODES_AS_SET = new SoftReference>(all);
}
return all;
}
/**
* Queries if the given ISO 4217 3-letter code is available on the specified date range.
*
* Note: For checking availability of a currency on a specific date, specify the date on both from and
* to. When both from and to are null, this method checks if the specified
* currency is available all time.
*
* @param code
* The ISO 4217 3-letter code.
* @param from
* The lower bound of the date range, inclusive. When from is null, check the availability
* of the currency any date before to
* @param to
* The upper bound of the date range, inclusive. When to is null, check the availability of
* the currency any date after from
* @return true if the given ISO 4217 3-letter code is supported on the specified date range.
* @throws IllegalArgumentException when to is before from.
*
* @stable ICU 4.6
*/
public static boolean isAvailable(String code, Date from, Date to) {
if (!isAlpha3Code(code)) {
return false;
}
if (from != null && to != null && from.after(to)) {
throw new IllegalArgumentException("To is before from");
}
code = code.toUpperCase(Locale.ENGLISH);
boolean isKnown = getAllCurrenciesAsSet().contains(code);
if (isKnown == false) {
return false;
} else if (from == null && to == null) {
return true;
}
// If caller passed a date range, we cannot rely solely on the cache
CurrencyMetaInfo info = CurrencyMetaInfo.getInstance();
List allActive = info.currencies(
CurrencyFilter.onDateRange(from, to).withCurrency(code));
return allActive.contains(code);
}
/**
* Returns the list of remaining tender currencies after a filter is applied.
* @param filter the filter to apply to the tender currencies
* @return a list of tender currencies
*/
private static List getTenderCurrencies(CurrencyFilter filter) {
CurrencyMetaInfo info = CurrencyMetaInfo.getInstance();
return info.currencies(filter.withTender());
}
private static final class EquivalenceRelation {
private Map> data = new HashMap>();
@SuppressWarnings("unchecked") // See ticket #11395, this is safe.
public EquivalenceRelation add(T... items) {
Set group = new HashSet();
for (T item : items) {
if (data.containsKey(item)) {
throw new IllegalArgumentException("All groups passed to add must be disjoint.");
}
group.add(item);
}
for (T item : items) {
data.put(item, group);
}
return this;
}
public Set get(T item) {
Set result = data.get(item);
if (result == null) {
return Collections.singleton(item);
}
return Collections.unmodifiableSet(result);
}
}
private Object writeReplace() throws ObjectStreamException {
return new MeasureUnitProxy(type, subType);
}
// For backward compatibility only
/**
* ISO 4217 3-letter code.
*/
private final String isoCode;
private Object readResolve() throws ObjectStreamException {
// The old isoCode field used to determine the currency.
return Currency.getInstance(isoCode);
}
}
//eof