1 /*
   2  * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package sun.util.locale.provider;
  27 
  28 import java.util.Calendar;
  29 import java.util.Locale;
  30 import java.util.Set;
  31 import java.util.TimeZone;
  32 import sun.util.spi.CalendarProvider;
  33 
  34 /**
  35  * Concrete implementation of the  {@link sun.util.spi.CalendarProvider
  36  * CalendarProvider} class for the JRE LocaleProviderAdapter.
  37  *
  38  * @author Naoto Sato
  39  */
  40 public class CalendarProviderImpl extends CalendarProvider implements AvailableLanguageTags {
  41     private final LocaleProviderAdapter.Type type;
  42     private Set<String> langtags;
  43 
  44     public CalendarProviderImpl(LocaleProviderAdapter.Type type) {
  45         this.type = type;
  46     }
  47 
  48     /**
  49      * Returns an array of all locales for which this locale service provider
  50      * can provide localized objects or names.
  51      *
  52      * @return An array of all locales for which this locale service provider
  53      * can provide localized objects or names.
  54      */
  55     @Override
  56     public Locale[] getAvailableLocales() {
  57         return LocaleProviderAdapter.toLocaleArray(getLangTags());
  58     }
  59 
  60     @Override
  61     public boolean isSupportedLocale(Locale locale) {
  62         // Support any locales.
  63         return true;
  64     }
  65 
  66     /**
  67      * Returns a new <code>Calendar</code> instance for the
  68      * specified locale.
  69      *
  70      * @param zone the time zone
  71      * @param locale the desired locale
  72      * @exception NullPointerException if <code>locale</code> is null
  73      * @exception IllegalArgumentException if <code>locale</code> isn't
  74      *     one of the locales returned from
  75      *     {@link java.util.spi.LocaleServiceProvider#getAvailableLocales()
  76      *     getAvailableLocales()}.
  77      * @return a <code>Calendar</code> instance.
  78      * @see java.util.Calendar#getInstance(java.util.Locale)
  79      */
  80     @Override
  81     public Calendar getInstance(TimeZone zone, Locale locale) {
  82         return new Calendar.Builder()
  83                      .setLocale(locale)
  84                      .setTimeZone(zone)
  85                      .setInstant(System.currentTimeMillis())
  86                      .build();
  87     }
  88 
  89     @Override
  90     public Set<String> getAvailableLanguageTags() {
  91         return getLangTags();
  92     }
  93 
  94     private Set<String> getLangTags() {
  95         if (langtags == null) {
  96             langtags = ((JRELocaleProviderAdapter)LocaleProviderAdapter.forType(type)).getLanguageTagSet("CalendarData");
  97         }
  98         return langtags;
  99     }
 100 }