Back to index...

	/*
	* Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	/*
	*
	* (C) Copyright Taligent, Inc. 1996, 1997 - All Rights Reserved
	* (C) Copyright IBM Corp. 1996 - 2002 - All Rights Reserved
	*
	* The original version of this source code and documentation
	* is copyrighted and owned by Taligent, Inc., a wholly-owned
	* subsidiary of IBM. These materials are provided under terms
	* of a License Agreement between Taligent and Sun. This technology
	* is protected by multiple US and International patents.
	*
	* This notice and attribution to Taligent may not be removed.
	* Taligent is a registered trademark of Taligent, Inc.
	*/

	package sun.util.locale.provider;

	import java.text.DecimalFormat;
	import java.text.DecimalFormatSymbols;
	import java.text.NumberFormat;
	import java.text.spi.NumberFormatProvider;
	import java.util.Currency;
	import java.util.Locale;
	import java.util.Set;

	/**
	* Concrete implementation of the {@link java.text.spi.NumberFormatProvider
	* NumberFormatProvider} class for the JRE LocaleProviderAdapter.
	*
	* @author Naoto Sato
	* @author Masayoshi Okutsu
	*/
	public class NumberFormatProviderImpl extends NumberFormatProvider implements AvailableLanguageTags {

	// Constants used by factory methods to specify a style of format.
	private static final int NUMBERSTYLE = 0;
	private static final int CURRENCYSTYLE = 1;
	private static final int PERCENTSTYLE = 2;
	private static final int SCIENTIFICSTYLE = 3;
	private static final int INTEGERSTYLE = 4;

	private final LocaleProviderAdapter.Type type;
	private final Set<String> langtags;

	public NumberFormatProviderImpl(LocaleProviderAdapter.Type type, Set<String> langtags) {
	this.type = type;
	this.langtags = langtags;
	}

	/**
	* Returns an array of all locales for which this locale service provider
	* can provide localized objects or names.
	*
	* @return An array of all locales for which this locale service provider
	* can provide localized objects or names.
	*/
	@Override
	public Locale[] getAvailableLocales() {
	return LocaleProviderAdapter.forType(type).getAvailableLocales();
	}

	@Override
	public boolean isSupportedLocale(Locale locale) {
	return LocaleProviderAdapter.isSupportedLocale(locale, type, langtags);
	}

	/**
	* Returns a new <code>NumberFormat</code> instance which formats
	* monetary values for the specified locale.
	*
	* @param locale the desired locale.
	* @exception NullPointerException if <code>locale</code> is null
	* @exception IllegalArgumentException if <code>locale</code> isn't
	* one of the locales returned from
	* {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()
	* getAvailableLocales()}.
	* @return a currency formatter
	* @see java.text.NumberFormat#getCurrencyInstance(java.util.Locale)
	*/
	@Override
	public NumberFormat getCurrencyInstance(Locale locale) {
	return getInstance(locale, CURRENCYSTYLE);
	}

	/**
	* Returns a new <code>NumberFormat</code> instance which formats
	* integer values for the specified locale.
	* The returned number format is configured to
	* round floating point numbers to the nearest integer using
	* half-even rounding (see {@link java.math.RoundingMode#HALF_EVEN HALF_EVEN})
	* for formatting, and to parse only the integer part of
	* an input string (see {@link
	* java.text.NumberFormat#isParseIntegerOnly isParseIntegerOnly}).
	*
	* @param locale the desired locale
	* @exception NullPointerException if <code>locale</code> is null
	* @exception IllegalArgumentException if <code>locale</code> isn't
	* one of the locales returned from
	* {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()
	* getAvailableLocales()}.
	* @return a number format for integer values
	* @see java.text.NumberFormat#getIntegerInstance(java.util.Locale)
	*/
	@Override
	public NumberFormat getIntegerInstance(Locale locale) {
	return getInstance(locale, INTEGERSTYLE);
	}

	/**
	* Returns a new general-purpose <code>NumberFormat</code> instance for
	* the specified locale.
	*
	* @param locale the desired locale
	* @exception NullPointerException if <code>locale</code> is null
	* @exception IllegalArgumentException if <code>locale</code> isn't
	* one of the locales returned from
	* {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()
	* getAvailableLocales()}.
	* @return a general-purpose number formatter
	* @see java.text.NumberFormat#getNumberInstance(java.util.Locale)
	*/
	@Override
	public NumberFormat getNumberInstance(Locale locale) {
	return getInstance(locale, NUMBERSTYLE);
	}

	/**
	* Returns a new <code>NumberFormat</code> instance which formats
	* percentage values for the specified locale.
	*
	* @param locale the desired locale
	* @exception NullPointerException if <code>locale</code> is null
	* @exception IllegalArgumentException if <code>locale</code> isn't
	* one of the locales returned from
	* {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()
	* getAvailableLocales()}.
	* @return a percent formatter
	* @see java.text.NumberFormat#getPercentInstance(java.util.Locale)
	*/
	@Override
	public NumberFormat getPercentInstance(Locale locale) {
	return getInstance(locale, PERCENTSTYLE);
	}

	private NumberFormat getInstance(Locale locale,
	int choice) {
	if (locale == null) {
	throw new NullPointerException();
	}

	LocaleProviderAdapter adapter = LocaleProviderAdapter.forType(type);
	String[] numberPatterns = adapter.getLocaleResources(locale).getNumberPatterns();
	DecimalFormatSymbols symbols = DecimalFormatSymbols.getInstance(locale);
	int entry = (choice == INTEGERSTYLE) ? NUMBERSTYLE : choice;
	DecimalFormat format = new DecimalFormat(numberPatterns[entry], symbols);

	if (choice == INTEGERSTYLE) {
	format.setMaximumFractionDigits(0);
	format.setDecimalSeparatorAlwaysShown(false);
	format.setParseIntegerOnly(true);
	} else if (choice == CURRENCYSTYLE) {
	adjustForCurrencyDefaultFractionDigits(format, symbols);
	}

	return format;
	}

	/**
	* Adjusts the minimum and maximum fraction digits to values that
	* are reasonable for the currency's default fraction digits.
	*/
	private static void adjustForCurrencyDefaultFractionDigits(
	DecimalFormat format, DecimalFormatSymbols symbols) {
	Currency currency = symbols.getCurrency();
	if (currency == null) {
	try {
	currency = Currency.getInstance(symbols.getInternationalCurrencySymbol());
	} catch (IllegalArgumentException e) {
	}
	}
	if (currency != null) {
	int digits = currency.getDefaultFractionDigits();
	if (digits != -1) {
	int oldMinDigits = format.getMinimumFractionDigits();
	// Common patterns are "#.##", "#.00", "#".
	// Try to adjust all of them in a reasonable way.
	if (oldMinDigits == format.getMaximumFractionDigits()) {
	format.setMinimumFractionDigits(digits);
	format.setMaximumFractionDigits(digits);
	} else {
	format.setMinimumFractionDigits(Math.min(digits, oldMinDigits));
	format.setMaximumFractionDigits(digits);
	}
	}
	}
	}

	@Override
	public Set<String> getAvailableLanguageTags() {
	return langtags;
	}
	}

Back to index...