/*
    *  Copyright 2001-2011 Stephen Colebourne
    *
    *  Licensed under the Apache License, Version 2.0 (the "License");
    *  you may not use this file except in compliance with the License.
    *  You may obtain a copy of the License at
    *
    *      http://www.apache.org/licenses/LICENSE-2.0
    *
   *  Unless required by applicable law or agreed to in writing, software
   *  distributed under the License is distributed on an "AS IS" BASIS,
   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *  See the License for the specific language governing permissions and
   *  limitations under the License.
   */
  package org.joda.time.tz;
  
  import java.text.DateFormatSymbols;
  import java.util.HashMap;
  import java.util.Locale;
  import java.util.Map;
  
  import org.joda.time.DateTimeUtils;
  
  /**
   * The default name provider acquires localized names from
   * {@link DateFormatSymbols java.text.DateFormatSymbols}.
   * <p>
   * DefaultNameProvider is thread-safe and immutable.
   *
   * @author Brian S O'Neill
   * @since 1.0
   */
  @SuppressWarnings("unchecked")
  public class DefaultNameProvider implements NameProvider {
      // locale -> (id -> (nameKey -> [shortName, name]))
      private HashMap<Locale, Map<String, Map<String, Object>>> iByLocaleCache = createCache();
  
      public DefaultNameProvider() {
      }
  
      public String getShortName(Locale locale, String id, String nameKey) {
          String[] nameSet = getNameSet(locale, id, nameKey);
          return nameSet == null ? null : nameSet[0];
      }
      
      public String getName(Locale locale, String id, String nameKey) {
          String[] nameSet = getNameSet(locale, id, nameKey);
          return nameSet == null ? null : nameSet[1];
      }
  
      private synchronized String[] getNameSet(Locale locale, String id, String nameKey) {
          if (locale == null || id == null || nameKey == null) {
              return null;
          }
  
          Map<String, Map<String, Object>> byIdCache = iByLocaleCache.get(locale);
          if (byIdCache == null) {
              iByLocaleCache.put(locale, byIdCache = createCache());
          }
  
          Map<String, Object> byNameKeyCache = byIdCache.get(id);
          if (byNameKeyCache == null) {
              byIdCache.put(id, byNameKeyCache = createCache());
              
              String[][] zoneStringsEn = DateTimeUtils.getDateFormatSymbols(Locale.ENGLISH).getZoneStrings();
              String[] setEn = null;
              for (String[] strings : zoneStringsEn) {
                if (strings != null && strings.length == 5 && id.equals(strings[0])) {
                  setEn = strings;
                  break;
                }
              }
              String[][] zoneStringsLoc = DateTimeUtils.getDateFormatSymbols(locale).getZoneStrings();
              String[] setLoc = null;
              for (String[] strings : zoneStringsLoc) {
                if (strings != null && strings.length == 5 && id.equals(strings[0])) {
                  setLoc = strings;
                  break;
                }
              }
              
              if (setEn != null && setLoc != null) {
                byNameKeyCache.put(setEn[2], new String[] {setLoc[2], setLoc[1]});
                // need to handle case where summer and winter have the same
                // abbreviation, such as EST in Australia [1716305]
                // we handle this by appending "-Summer", cf ZoneInfoCompiler
                if (setEn[2].equals(setEn[4])) {
                    byNameKeyCache.put(setEn[4] + "-Summer", new String[] {setLoc[4], setLoc[3]});
                } else {
                    byNameKeyCache.put(setEn[4], new String[] {setLoc[4], setLoc[3]});
                }
              }
          }
          return (String[]) byNameKeyCache.get(nameKey);
      }
  
      private HashMap createCache() {
          return new HashMap(7);
     }
 }