1 /*
   2  * Copyright (c) 2012, 2013, 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         Collections.singleton(Locale.ROOT.toLanguageTag());
  45 
  46     /**
  47      * Fallback provider only provides the ROOT locale data.
  48      */
  49     private final LocaleResources rootLocaleResources =
  50         new LocaleResources(this, Locale.ROOT);
  51 
  52     /**
  53      * Returns the type of this LocaleProviderAdapter
  54      */
  55     @Override
  56     public LocaleProviderAdapter.Type getAdapterType() {
  57         return Type.FALLBACK;
  58     }
  59 
  60     @Override
  61     public LocaleResources getLocaleResources(Locale locale) {
  62         return rootLocaleResources;
  63     }
  64 
  65     @Override
  66     protected Set<String> createLanguageTagSet(String category) {
  67         return rootTagSet;
  68     }
  69 }