001 /* CurrencyNameProvider.java -- Providers of localized currency symbols
002 Copyright (C) 2007 Free Software Foundation, Inc.
003
004 This file is part of GNU Classpath.
005
006 GNU Classpath is free software; you can redistribute it and/or modify
007 it under the terms of the GNU General Public License as published by
008 the Free Software Foundation; either version 2, or (at your option)
009 any later version.
010
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012 WITHOUT ANY WARRANTY; without even the implied warranty of
013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014 General Public License for more details.
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019 02110-1301 USA.
020
021 Linking this library statically or dynamically with other modules is
022 making a combined work based on this library. Thus, the terms and
023 conditions of the GNU General Public License cover the whole
024 combination.
025
026 As a special exception, the copyright holders of this library give you
027 permission to link this library with independent modules to produce an
028 executable, regardless of the license terms of these independent
029 modules, and to copy and distribute the resulting executable under
030 terms of your choice, provided that you also meet, for each linked
031 independent module, the terms and conditions of the license of that
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033 or based on this library. If you modify this library, you may extend
034 this exception to your version of the library, but you are not
035 obligated to do so. If you do not wish to do so, delete this
036 exception statement from your version. */
037
038 package java.util.spi;
039
040 import java.util.Locale;
041
042 /**
043 * A {@link CurrencyNameProvider} provides localized
044 * versions of the symbols that represent a particular
045 * currency. Note that currency symbols are regarded
046 * as names, and thus a <code>null</code> value may
047 * be returned, which should be treated as a lack of
048 * support for the specified {@link Locale}.
049 *
050 * @author Andrew John Hughes (gnu_andrew@member.fsf.org)
051 * @since 1.6
052 */
053 public abstract class CurrencyNameProvider
054 extends LocaleServiceProvider
055 {
056
057 /**
058 * Constructs a new {@link CurrencyNameProvider}.
059 * Provided for implicit invocation by subclasses.
060 */
061 protected CurrencyNameProvider()
062 {
063 }
064
065 /**
066 * <p>
067 * This method returns the symbol which precedes or follows a
068 * value in this particular currency. The returned value is
069 * the symbol used to denote the currency in the specified locale.
070 * </p>
071 * <p>
072 * For example, a supplied locale may specify a different symbol
073 * for the currency, due to conflicts with its own currency.
074 * This would be the case with the American currency, the dollar.
075 * Locales that also use a dollar-based currency (e.g. Canada, Australia)
076 * need to differentiate the American dollar using 'US$' rather than '$'.
077 * So, supplying one of these locales to <code>getSymbol()</code> would
078 * return this value, rather than the standard '$'.
079 * </p>
080 * <p>
081 * In cases where there is no such symbol for a particular currency,
082 * <code>null</code> should be returned.
083 * </p>
084 *
085 * @param currencyCode the ISO 4217 currency code, consisting
086 * of three uppercase letters from 'A' to 'Z'
087 * @param locale the locale to express the symbol in.
088 * @return the currency symbol, or <code>null</code> if one is
089 * unavailable.
090 * @throws NullPointerException if the locale is null.
091 * @throws IllegalArgumentException if the currency code is
092 * not in the correct format
093 * or the locale is not one
094 * returned by
095 * {@link getAvailableLocales()}
096 * @see java.util.Currency#getSymbol(java.util.Locale)
097 */
098 public abstract String getSymbol(String currencyCode, Locale locale);
099
100 }