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International Component for Unicode for Java (ICU4J) is a mature, widely used Java library
providing Unicode and Globalization support
/*
*******************************************************************************
* Copyright (C) 2009-2011, International Business Machines Corporation and *
* others. All Rights Reserved. *
*******************************************************************************
*/
package com.ibm.icu.text;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Locale;
import java.util.Map;
import com.ibm.icu.impl.CurrencyData;
import com.ibm.icu.util.ULocale;
import com.ibm.icu.util.ULocale.Category;
/**
* This class represents the information needed by
* DecimalFormat to format currency plural,
* such as "3.00 US dollars" or "1.00 US dollar".
* DecimalFormat creates for itself an instance of
* CurrencyPluralInfo from its locale data.
* If you need to change any of these symbols, you can get the
* CurrencyPluralInfo object from your
* DecimalFormat and modify it.
*
* Following are the information needed for currency plural format and parse:
* locale information,
* plural rule of the locale,
* currency plural pattern of the locale.
*
* @stable ICU 4.2
*/
public class CurrencyPluralInfo implements Cloneable, Serializable {
private static final long serialVersionUID = 1;
/**
* Create a CurrencyPluralInfo object for the default FORMAT locale.
* @see Category#FORMAT
* @stable ICU 4.2
*/
public CurrencyPluralInfo() {
initialize(ULocale.getDefault(Category.FORMAT));
}
/**
* Create a CurrencyPluralInfo object for the given locale.
* @param locale the locale
* @stable ICU 4.2
*/
public CurrencyPluralInfo(Locale locale) {
initialize(ULocale.forLocale(locale));
}
/**
* Create a CurrencyPluralInfo object for the given locale.
* @param locale the locale
* @stable ICU 4.2
*/
public CurrencyPluralInfo(ULocale locale) {
initialize(locale);
}
/**
* Gets a CurrencyPluralInfo instance for the default locale.
*
* @return A CurrencyPluralInfo instance.
* @stable ICU 4.2
*/
public static CurrencyPluralInfo getInstance() {
return new CurrencyPluralInfo();
}
/**
* Gets a CurrencyPluralInfo instance for the given locale.
*
* @param locale the locale.
* @return A CurrencyPluralInfo instance.
* @stable ICU 4.2
*/
public static CurrencyPluralInfo getInstance(Locale locale) {
return new CurrencyPluralInfo(locale);
}
/**
* Gets a CurrencyPluralInfo instance for the given locale.
*
* @param locale the locale.
* @return A CurrencyPluralInfo instance.
* @stable ICU 4.2
*/
public static CurrencyPluralInfo getInstance(ULocale locale) {
return new CurrencyPluralInfo(locale);
}
/**
* Gets plural rules of this locale, used for currency plural format
*
* @return plural rule
* @stable ICU 4.2
*/
public PluralRules getPluralRules() {
return pluralRules;
}
/**
* Given a plural count, gets currency plural pattern of this locale,
* used for currency plural format
*
* @param pluralCount currency plural count
* @return a currency plural pattern based on plural count
* @stable ICU 4.2
*/
public String getCurrencyPluralPattern(String pluralCount) {
String currencyPluralPattern = pluralCountToCurrencyUnitPattern.get(pluralCount);
if (currencyPluralPattern == null) {
// fall back to "other"
if (!pluralCount.equals("other")) {
currencyPluralPattern = pluralCountToCurrencyUnitPattern.get("other");
}
if (currencyPluralPattern == null) {
// no currencyUnitPatterns defined,
// fallback to predefined default.
// This should never happen when ICU resource files are
// available, since currencyUnitPattern of "other" is always
// defined in root.
currencyPluralPattern = defaultCurrencyPluralPattern;
}
}
return currencyPluralPattern;
}
/**
* Get locale
*
* @return locale
*
* @stable ICU 4.2
*/
public ULocale getLocale() {
return ulocale;
}
/**
* Set plural rules. These are initially set in the constructor based on the locale,
* and usually do not need to be changed.
*
* @param ruleDescription new plural rule description
* @stable ICU 4.2
*/
public void setPluralRules(String ruleDescription) {
pluralRules = PluralRules.createRules(ruleDescription);
}
/**
* Set currency plural patterns. These are initially set in the constructor based on the
* locale, and usually do not need to be changed.
*
* @param pluralCount the plural count for which the currency pattern will
* be overridden.
* @param pattern the new currency plural pattern
* @stable ICU 4.2
*/
public void setCurrencyPluralPattern(String pluralCount, String pattern) {
pluralCountToCurrencyUnitPattern.put(pluralCount, pattern);
}
/**
* Set locale. This also sets both the plural rules and the currency plural patterns to be
* the defaults for the locale.
*
* @param loc the new locale to set
* @stable ICU 4.2
*/
public void setLocale(ULocale loc) {
ulocale = loc;
initialize(loc);
}
/**
* Standard override
*
* @stable ICU 4.2
*/
public Object clone() {
try {
CurrencyPluralInfo other = (CurrencyPluralInfo) super.clone();
// locale is immutable
other.ulocale = (ULocale)ulocale.clone();
// plural rule is immutable
//other.pluralRules = pluralRules;
// clone content
//other.pluralCountToCurrencyUnitPattern = pluralCountToCurrencyUnitPattern;
other.pluralCountToCurrencyUnitPattern = new HashMap();
for (String pluralCount : pluralCountToCurrencyUnitPattern.keySet()) {
String currencyPattern = pluralCountToCurrencyUnitPattern.get(pluralCount);
other.pluralCountToCurrencyUnitPattern.put(pluralCount, currencyPattern);
}
return other;
} catch (CloneNotSupportedException e) {
throw new IllegalStateException();
}
}
/**
* Override equals
*
* @stable ICU 4.2
*/
public boolean equals(Object a) {
if (a instanceof CurrencyPluralInfo) {
CurrencyPluralInfo other = (CurrencyPluralInfo)a;
return pluralRules.equals(other.pluralRules) &&
pluralCountToCurrencyUnitPattern.equals(other.pluralCountToCurrencyUnitPattern);
}
return false;
}
/**
* Mock implementation of hashCode(). This implementation always returns a constant
* value. When Java assertion is enabled, this method triggers an assertion failure.
* @internal
* @deprecated This API is ICU internal only.
*/
public int hashCode() {
assert false : "hashCode not designed";
return 42;
}
/**
* Given a number, returns the keyword of the first rule that applies
* to the number.
*/
String select(double number) {
return pluralRules.select(number);
}
/**
* Currency plural pattern iterator.
*
* @return a iterator on the currency plural pattern key set.
*/
Iterator pluralPatternIterator() {
return pluralCountToCurrencyUnitPattern.keySet().iterator();
}
private void initialize(ULocale uloc) {
ulocale = uloc;
pluralRules = PluralRules.forLocale(uloc);
setupCurrencyPluralPattern(uloc);
}
private void setupCurrencyPluralPattern(ULocale uloc) {
pluralCountToCurrencyUnitPattern = new HashMap();
String numberStylePattern = NumberFormat.getPattern(uloc, NumberFormat.NUMBERSTYLE);
// Split the number style pattern into pos and neg if applicable
int separatorIndex = numberStylePattern.indexOf(";");
String negNumberPattern = null;
if (separatorIndex != -1) {
negNumberPattern = numberStylePattern.substring(separatorIndex + 1);
numberStylePattern = numberStylePattern.substring(0, separatorIndex);
}
Map map = CurrencyData.provider.getInstance(uloc, true).getUnitPatterns();
for (Map.Entry e : map.entrySet()) {
String pluralCount = e.getKey();
String pattern = e.getValue();
// replace {0} with numberStylePattern
// and {1} with triple currency sign
String patternWithNumber = pattern.replace("{0}", numberStylePattern);
String patternWithCurrencySign = patternWithNumber.replace("{1}", tripleCurrencyStr);
if (separatorIndex != -1) {
String negPattern = pattern;
String negWithNumber = negPattern.replace("{0}", negNumberPattern);
String negWithCurrSign = negWithNumber.replace("{1}", tripleCurrencyStr);
StringBuilder posNegPatterns = new StringBuilder(patternWithCurrencySign);
posNegPatterns.append(";");
posNegPatterns.append(negWithCurrSign);
patternWithCurrencySign = posNegPatterns.toString();
}
pluralCountToCurrencyUnitPattern.put(pluralCount, patternWithCurrencySign);
}
}
//-------------------- private data member ---------------------
//
// triple currency sign char array
private static final char[] tripleCurrencySign = {0xA4, 0xA4, 0xA4};
// triple currency sign string
private static final String tripleCurrencyStr = new String(tripleCurrencySign);
// default currency plural pattern char array
private static final char[] defaultCurrencyPluralPatternChar = {0, '.', '#', '#', ' ', 0xA4, 0xA4, 0xA4};
// default currency plural pattern string
private static final String defaultCurrencyPluralPattern = new String(defaultCurrencyPluralPatternChar);
// map from plural count to currency plural pattern, for example
// one (plural count) --> {0} {1} (currency plural pattern,
// in which {0} is the amount number, and {1} is the currency plural name).
private Map pluralCountToCurrencyUnitPattern = null;
/*
* The plural rule is used to format currency plural name,
* for example: "3.00 US Dollars".
* If there are 3 currency signs in the currency pattern,
* the 3 currency signs will be replaced by the currency plural name.
*/
private PluralRules pluralRules = null;
// locale
private ULocale ulocale = null;
}