1 /*
   2  * Copyright (c) 2012, 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.Collections;
  29 import java.util.HashSet;
  30 import java.util.Locale;
  31 import java.util.Set;
  32 
  33 /**
  34  * FallbackProviderAdapter implementation.
  35  *
  36  * @author Naoto Sato
  37  */
  38 public class FallbackLocaleProviderAdapter extends JRELocaleProviderAdapter {
  39 
  40     /**
  41      * Supported language tag set.
  42      */
  43     private static final Set<String> rootTagSet;
  44     static {
  45         Set<String> tmp = new HashSet<>();
  46         tmp.add(Locale.ROOT.toLanguageTag());
  47         rootTagSet = Collections.unmodifiableSet(tmp);
  48     }
  49 
  50     /**
  51      * Fallback provider only provides the ROOT locale data.
  52      */
  53     private final LocaleResources rootLocaleResources =
  54         new LocaleResources(this, Locale.ROOT);
  55 
  56     /**
  57      * Returns the type of this LocaleProviderAdapter
  58      */
  59     @Override
  60     public LocaleProviderAdapter.Type getAdapterType() {
  61         return Type.FALLBACK;
  62     }
  63 
  64     @Override
  65     public LocaleResources getLocaleResources(Locale locale) {
  66         return rootLocaleResources;
  67     }
  68 
  69     @Override
  70     protected Set<String> createLanguageTagSet(String category) {
  71         return rootTagSet;
  72     }
  73 }