001    /* TimeZoneNameProvider.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    
011    GNU Classpath is distributed in the hope that it will be useful, but
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.
015    
016    You should have received a copy of the GNU General Public License
017    along with GNU Classpath; see the file COPYING.  If not, write to the
018    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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
032    module.  An independent module is a module which is not derived from
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 TimeZoneNameProvider} provides localized
044     * versions of the names that represent a particular
045     * timezone.  A <code>null</code> value may
046     * be returned, which should be treated as a lack of
047     * support for the specified {@link Locale}.  The names
048     * from this class are also used by
049     * {@link DateFormatSymbols#getZoneStrings()}.
050     *
051     * @author Andrew John Hughes (gnu_andrew@member.fsf.org)
052     * @since 1.6
053     */
054    public abstract class TimeZoneNameProvider
055      extends LocaleServiceProvider
056    {
057    
058      /**
059       * Constructs a new {@link TimeZoneNameProvider}.
060       * Provided for implicit invocation by subclasses.
061       */
062      protected TimeZoneNameProvider()
063      {
064      }
065    
066      /**
067       * Returns a name for the specified time zone identifier
068       * localized to the supplied {@link java.util.Locale}.
069       * The time zone identifier is either <code>"GMT"</code>
070       * or one of the identifiers from the public domain "tz
071       * database" found at <a href="ftp://elsie.nci.nih.gov/pub/">
072       * ftp://elsie.nci.nih.gov/pub</a>.  Note that a translated
073       * name for the daylight savings time variant should be returned,
074       * even if the timezone has not observed daylight savings
075       * time in the past.  If the name of the timezone
076       * in the given locale is not supported, <code>null</code>
077       * is returned.
078       *
079       * @param id a time zone identifier.
080       * @param daylight true if the daylight savings time variant
081       *                 should be returned.
082       * @param style either {@link java.util.TimeZone.LONG} or
083       *              {@link java.util.TimeZone.SHORT}
084       * @param locale the locale to express the timezone in.
085       * @return the localized time zone name, or <code>null</code>
086       *         if one is not available.
087       * @throws NullPointerException if the identifer or locale is null.
088       * @throws IllegalArgumentException if the style is invalid
089       *                                  or the locale is not one
090       *                                  returned by
091       *                                  {@link getAvailableLocales()}
092       * @see java.util.TimeZone#getDisplayName(boolean,int,java.util.Locale)
093       */
094      public abstract String getDisplayName(String id, boolean daylight,
095                                            int style, Locale locale);
096    
097    }