1 /*
   2  * Copyright (c) 2017, 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.cldr;
  27 
  28 import static sun.util.locale.provider.LocaleProviderAdapter.Type;
  29 
  30 import java.util.Arrays;
  31 import java.util.Map;
  32 import java.util.Locale;
  33 import java.util.Set;
  34 import java.util.Optional;
  35 import java.util.concurrent.ConcurrentHashMap;
  36 import sun.util.locale.provider.LocaleProviderAdapter;
  37 import sun.util.locale.provider.LocaleResources;
  38 import sun.util.locale.provider.CalendarDataProviderImpl;
  39 import sun.util.locale.provider.CalendarDataUtility;
  40 
  41 /**
  42  * Concrete implementation of the
  43  * {@link java.util.spi.CalendarDataProvider CalendarDataProvider} class
  44  * for the CLDR LocaleProviderAdapter.
  45  *
  46  * @author Naoto Sato
  47  */
  48 public class CLDRCalendarDataProviderImpl extends CalendarDataProviderImpl {
  49 
  50     private static Map<String, Integer> firstDay = new ConcurrentHashMap<>();
  51     private static Map<String, Integer> minDays = new ConcurrentHashMap<>();
  52 
  53     public CLDRCalendarDataProviderImpl(Type type, Set<String> langtags) {
  54         super(type, langtags);
  55     }
  56 
  57     @Override
  58     public int getFirstDayOfWeek(Locale locale) {
  59         return findValue(CalendarDataUtility.FIRST_DAY_OF_WEEK, locale);
  60     }
  61 
  62     @Override
  63     public int getMinimalDaysInFirstWeek(Locale locale) {
  64         return findValue(CalendarDataUtility.MINIMAL_DAYS_IN_FIRST_WEEK, locale);
  65     }
  66 
  67     /**
  68      * Finds the requested integer value for the locale.
  69      * Each resource consists of the following:
  70      * 
  71      *    (n: cc1 cc2 ... ccx;)*
  72      *
  73      * where 'n' is the integer for the following region codes, terminated by
  74      * a ';'.
  75      *
  76      */
  77     private static int findValue(String key, Locale locale) {
  78         Map<String, Integer> map = CalendarDataUtility.FIRST_DAY_OF_WEEK.equals(key) ?
  79             firstDay : minDays;
  80         String region = locale.getCountry();
  81 
  82         if (region.isEmpty()) {
  83             return 0;
  84         }
  85 
  86         Integer val = map.get(region);
  87         if (val == null) {
  88             String valStr =
  89                 LocaleProviderAdapter.forType(Type.CLDR).getLocaleResources(Locale.ROOT)
  90                    .getCalendarData(key);
  91             val = retrieveInteger(valStr, region)
  92                 .orElse(retrieveInteger(valStr, "001").orElse(0));
  93             map.putIfAbsent(region, val);
  94         }
  95 
  96         return val;
  97     }
  98 
  99     private static Optional<Integer> retrieveInteger(String src, String region) {
 100         return Arrays.stream(src.split(";"))
 101             .filter(entry -> entry.contains(region))
 102             .map(entry -> entry.substring(0, entry.indexOf(":")))
 103             .findAny()
 104             .map(Integer::parseInt);
 105     }        
 106 }