| /** |
| ******************************************************************************* |
| * Copyright (C) 2001-2011, International Business Machines Corporation and * |
| * others. All Rights Reserved. * |
| ******************************************************************************* |
| */ |
| package com.ibm.icu.util; |
| |
| import java.io.Serializable; |
| import java.lang.ref.SoftReference; |
| import java.text.ParsePosition; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.Date; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Locale; |
| import java.util.Map; |
| |
| 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; |
| |
| /** |
| * A class encapsulating a currency, as defined by ISO 4217. A |
| * <tt>Currency</tt> object can be created given a <tt>Locale</tt> or |
| * given an ISO 4217 code. Once created, the <tt>Currency</tt> object |
| * can return various data necessary to its proper display: |
| * |
| * <ul><li>A display symbol, for a specific locale |
| * <li>The number of fraction digits to display |
| * <li>A rounding increment |
| * </ul> |
| * |
| * The <tt>DecimalFormat</tt> class uses these data to display |
| * currencies. |
| * |
| * <p>Note: This class deliberately resembles |
| * <tt>java.util.Currency</tt> 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 implements Serializable { |
| // using serialver from jdk1.4.2_05 |
| private static final long serialVersionUID = -5839973855554750484L; |
| private static final boolean DEBUG = ICUDebug.enabled("currency"); |
| |
| // Cache to save currency name trie |
| private static ICUCache<ULocale, List<TextTrieMap<CurrencyStringInfo>>> CURRENCY_NAME_CACHE = |
| new SimpleCache<ULocale, List<TextTrieMap<CurrencyStringInfo>>>(); |
| |
| /** |
| * ISO 4217 3-letter code. |
| */ |
| private String isoCode; |
| |
| /** |
| * 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; |
| |
| // 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) { |
| CurrencyMetaInfo info = CurrencyMetaInfo.getInstance(); |
| CurrencyFilter filter = CurrencyFilter.onDate(d).withRegion(loc.getCountry()); |
| List<String> list = info.currencies(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()]); |
| } |
| |
| private static final String EUR_STR = "EUR"; |
| private static final ICUCache<ULocale, String> currencyCodeCache = new SimpleCache<ULocale, String>(); |
| |
| /** |
| * Instantiate a currency from resource data. |
| */ |
| /* package */ static Currency createCurrency(ULocale loc) { |
| |
| String variant = loc.getVariant(); |
| if ("EURO".equals(variant)) { |
| return new Currency(EUR_STR); |
| } |
| |
| String code = currencyCodeCache.get(loc); |
| if (code == null) { |
| String country = loc.getCountry(); |
| |
| CurrencyMetaInfo info = CurrencyMetaInfo.getInstance(); |
| List<String> 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 new Currency(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 <code>theISOCode</code> is null. |
| * @throws IllegalArgumentException if <code>theISOCode</code> 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 new Currency(theISOCode.toUpperCase(Locale.US)); |
| } |
| |
| 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. |
| * @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. |
| * <p> |
| * The only supported key is "currency", other values return an empty array. |
| * <p> |
| * 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. |
| * <p> |
| * 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 |
| * <a href="http://unicode.org/reports/tr35/#Supplemental_Currency_Data">Unicode TR#35 Sec. C1</a>. |
| * 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; |
| } |
| |
| CurrencyMetaInfo info = CurrencyMetaInfo.getInstance(); |
| if (!commonlyUsed) { |
| // Behavior change from 4.3.3, no longer sort the currencies |
| return getAvailableCurrencyCodes().toArray(new String[0]); |
| } |
| |
| // Don't resolve region if the requested locale is 'und', it will resolve to US |
| // which we don't want. |
| String prefRegion = locale.getCountry(); |
| if (prefRegion.length() == 0) { |
| if (UND.equals(locale)) { |
| return EMPTY_STRING_ARRAY; |
| } |
| ULocale loc = ULocale.addLikelySubtags(locale); |
| prefRegion = loc.getCountry(); |
| } |
| |
| CurrencyFilter filter = CurrencyFilter.now().withRegion(prefRegion); |
| |
| // currencies are in region's preferred order when we're filtering on region, which |
| // matches our spec |
| List<String> result = info.currencies(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]; |
| |
| /** |
| * Return a hashcode for this currency. |
| * @stable ICU 2.2 |
| */ |
| public int hashCode() { |
| return isoCode.hashCode(); |
| } |
| |
| /** |
| * Return true if rhs is a Currency instance, |
| * is non-null, and has the same currency code. |
| * @stable ICU 2.2 |
| */ |
| public boolean equals(Object rhs) { |
| if (rhs == null) return false; |
| if (rhs == this) return true; |
| try { |
| Currency c = (Currency) rhs; |
| return isoCode.equals(c.isoCode); |
| } |
| catch (ClassCastException e) { |
| return false; |
| } |
| } |
| |
| /** |
| * Returns the ISO 4217 3-letter code for this currency object. |
| * @stable ICU 2.2 |
| */ |
| public String getCurrencyCode() { |
| return isoCode; |
| } |
| |
| /** |
| * Convenience and compatibility override of getName that |
| * requests the symbol name. |
| * @see #getName |
| * @stable ICU 3.4 |
| */ |
| public String getSymbol() { |
| return getSymbol(ULocale.getDefault()); |
| } |
| |
| /** |
| * 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. <b>Note:</b> |
| * as of ICU 4.4, choice formats are not used, and the value returned |
| * in isChoiceFormat is always false. |
| * <p> |
| * @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(isoCode) : names.getName(isoCode); |
| } |
| |
| /** |
| * 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. <b>Note:</b> |
| * 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(isoCode, pluralCount); |
| } |
| |
| /** |
| * 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. |
| */ |
| public static String parse(ULocale locale, String text, int type, ParsePosition pos) { |
| List<TextTrieMap<CurrencyStringInfo>> currencyTrieVec = CURRENCY_NAME_CACHE.get(locale); |
| if (currencyTrieVec == null) { |
| TextTrieMap<CurrencyStringInfo> currencyNameTrie = |
| new TextTrieMap<CurrencyStringInfo>(true); |
| TextTrieMap<CurrencyStringInfo> currencySymbolTrie = |
| new TextTrieMap<CurrencyStringInfo>(false); |
| currencyTrieVec = new ArrayList<TextTrieMap<CurrencyStringInfo>>(); |
| 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<CurrencyStringInfo> currencyNameTrie = currencyTrieVec.get(1); |
| CurrencyNameResultHandler handler = new CurrencyNameResultHandler(); |
| currencyNameTrie.find(text, pos.getIndex(), handler); |
| List<CurrencyStringInfo> list = handler.getMatchedCurrencyNames(); |
| if (list != null && list.size() != 0) { |
| for (CurrencyStringInfo info : list) { |
| String isoCode = info.getISOCode(); |
| String currencyString = info.getCurrencyString(); |
| if (currencyString.length() > maxLength) { |
| maxLength = currencyString.length(); |
| isoResult = isoCode; |
| } |
| } |
| } |
| |
| if (type != Currency.LONG_NAME) { // not long name only |
| TextTrieMap<CurrencyStringInfo> currencySymbolTrie = currencyTrieVec.get(0); |
| handler = new CurrencyNameResultHandler(); |
| currencySymbolTrie.find(text, pos.getIndex(), handler); |
| list = handler.getMatchedCurrencyNames(); |
| if (list != null && list.size() != 0) { |
| for (CurrencyStringInfo info : list) { |
| String isoCode = info.getISOCode(); |
| String currencyString = info.getCurrencyString(); |
| if (currencyString.length() > maxLength) { |
| maxLength = currencyString.length(); |
| isoResult = isoCode; |
| } |
| } |
| } |
| } |
| |
| int start = pos.getIndex(); |
| pos.setIndex(start + maxLength); |
| return isoResult; |
| } |
| |
| private static void setupCurrencyTrieVec(ULocale locale, |
| List<TextTrieMap<CurrencyStringInfo>> trieVec) { |
| |
| TextTrieMap<CurrencyStringInfo> symTrie = trieVec.get(0); |
| TextTrieMap<CurrencyStringInfo> trie = trieVec.get(1); |
| |
| CurrencyDisplayNames names = CurrencyDisplayNames.getInstance(locale); |
| for (Map.Entry<String, String> e : names.symbolMap().entrySet()) { |
| String symbol = e.getKey(); |
| String isoCode = e.getValue(); |
| symTrie.put(symbol, new CurrencyStringInfo(isoCode, symbol)); |
| } |
| for (Map.Entry<String, String> 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; |
| } |
| |
| private String getISOCode() { |
| return isoCode; |
| } |
| |
| private String getCurrencyString() { |
| return currencyString; |
| } |
| } |
| |
| private static class CurrencyNameResultHandler |
| implements TextTrieMap.ResultHandler<CurrencyStringInfo> { |
| private ArrayList<CurrencyStringInfo> resultList; |
| |
| public boolean handlePrefixMatch(int matchLength, Iterator<CurrencyStringInfo> values) { |
| if (resultList == null) { |
| resultList = new ArrayList<CurrencyStringInfo>(); |
| } |
| while (values.hasNext()) { |
| CurrencyStringInfo item = values.next(); |
| if (item == null) { |
| break; |
| } |
| int i = 0; |
| for (; i < resultList.size(); i++) { |
| CurrencyStringInfo tmp = resultList.get(i); |
| if (item.getISOCode() == tmp.getISOCode()) { |
| if (matchLength > tmp.getCurrencyString().length()) { |
| resultList.set(i, item); |
| } |
| break; |
| } |
| } |
| if (i == resultList.size()) { |
| // not found in the current list |
| resultList.add(item); |
| } |
| } |
| return true; |
| } |
| |
| List<CurrencyStringInfo> getMatchedCurrencyNames() { |
| if (resultList == null || resultList.size() == 0) { |
| return null; |
| } |
| return resultList; |
| } |
| } |
| |
| /** |
| * Returns the number of the number of fraction digits that should |
| * be displayed for this currency. |
| * @return a non-negative number of fraction digits to be |
| * displayed |
| * @stable ICU 2.2 |
| */ |
| public int getDefaultFractionDigits() { |
| CurrencyMetaInfo info = CurrencyMetaInfo.getInstance(); |
| CurrencyDigits digits = info.currencyDigits(isoCode); |
| return digits.fractionDigits; |
| } |
| |
| /** |
| * Returns the rounding increment for this currency, or 0.0 if no |
| * rounding is done by this currency. |
| * @return the non-negative rounding increment, or 0.0 if none |
| * @stable ICU 2.2 |
| */ |
| public double getRoundingIncrement() { |
| CurrencyMetaInfo info = CurrencyMetaInfo.getInstance(); |
| CurrencyDigits digits = info.currencyDigits(isoCode); |
| |
| 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 isoCode; |
| } |
| |
| /** |
| * 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) { |
| isoCode = theISOCode; |
| } |
| |
| // POW10[i] = 10^i |
| private static final int[] POW10 = { |
| 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000, 1000000000 |
| }; |
| |
| |
| private static SoftReference<List<String>> ALL_CODES; |
| /* |
| * Returns an unmodifiable String list including all known currency codes |
| */ |
| private static synchronized List<String> getAvailableCurrencyCodes() { |
| List<String> all = (ALL_CODES == null) ? null : ALL_CODES.get(); |
| if (all == null) { |
| CurrencyMetaInfo info = CurrencyMetaInfo.getInstance(); |
| // 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.onRange(null, new Date(253373299200000L)); |
| all = Collections.unmodifiableList(info.currencies(filter)); |
| ALL_CODES = new SoftReference<List<String>>(all); |
| } |
| return all; |
| } |
| |
| /** |
| * Queries if the given ISO 4217 3-letter code is available on the specified date range. |
| * <p> |
| * Note: For checking availability of a currency on a specific date, specify the date on both <code>from</code> and |
| * <code>to</code>. When both <code>from</code> and <code>to</code> 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 <code>from</code> is null, check the availability |
| * of the currency any date before <code>to</code> |
| * @param to |
| * The upper bound of the date range, inclusive. When <code>to</code> is null, check the availability of |
| * the currency any date after <code>from</code> |
| * @return true if the given ISO 4217 3-letter code is supported on the specified date range. |
| * @throws IllegalArgumentException when <code>to</code> is before <code>from</code>. |
| * |
| * @draft ICU 4.6 |
| * @provisional This API might change or be removed in a future release. |
| */ |
| 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 = getAvailableCurrencyCodes().contains(code); |
| if (isKnown == false) { |
| return false; |
| } else if (from == null && to == null) { |
| return true; |
| } |
| |
| // When asActiveOnly is true, check if the currency is currently |
| // active or not. |
| CurrencyMetaInfo info = CurrencyMetaInfo.getInstance(); |
| List<String> allActive = info.currencies(CurrencyFilter.onRange(from, to)); |
| return allActive.contains(code); |
| } |
| } |
| //eof |
