001 /*
002 * Copyright 2001-2011 Stephen Colebourne
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016 package org.joda.time.tz;
017
018 import java.text.DateFormatSymbols;
019 import java.util.HashMap;
020 import java.util.Locale;
021 import java.util.Map;
022
023 import org.joda.time.DateTimeUtils;
024
025 /**
026 * The default name provider acquires localized names from
027 * {@link DateFormatSymbols java.text.DateFormatSymbols}.
028 * <p>
029 * DefaultNameProvider is thread-safe and immutable.
030 *
031 * @author Brian S O'Neill
032 * @since 1.0
033 */
034 @SuppressWarnings("unchecked")
035 public class DefaultNameProvider implements NameProvider {
036 // locale -> (id -> (nameKey -> [shortName, name]))
037 private HashMap<Locale, Map<String, Map<String, Object>>> iByLocaleCache = createCache();
038
039 public DefaultNameProvider() {
040 }
041
042 public String getShortName(Locale locale, String id, String nameKey) {
043 String[] nameSet = getNameSet(locale, id, nameKey);
044 return nameSet == null ? null : nameSet[0];
045 }
046
047 public String getName(Locale locale, String id, String nameKey) {
048 String[] nameSet = getNameSet(locale, id, nameKey);
049 return nameSet == null ? null : nameSet[1];
050 }
051
052 private synchronized String[] getNameSet(Locale locale, String id, String nameKey) {
053 if (locale == null || id == null || nameKey == null) {
054 return null;
055 }
056
057 Map<String, Map<String, Object>> byIdCache = iByLocaleCache.get(locale);
058 if (byIdCache == null) {
059 iByLocaleCache.put(locale, byIdCache = createCache());
060 }
061
062 Map<String, Object> byNameKeyCache = byIdCache.get(id);
063 if (byNameKeyCache == null) {
064 byIdCache.put(id, byNameKeyCache = createCache());
065
066 String[][] zoneStringsEn = DateTimeUtils.getDateFormatSymbols(Locale.ENGLISH).getZoneStrings();
067 String[] setEn = null;
068 for (String[] strings : zoneStringsEn) {
069 if (strings != null && strings.length == 5 && id.equals(strings[0])) {
070 setEn = strings;
071 break;
072 }
073 }
074 String[][] zoneStringsLoc = DateTimeUtils.getDateFormatSymbols(locale).getZoneStrings();
075 String[] setLoc = null;
076 for (String[] strings : zoneStringsLoc) {
077 if (strings != null && strings.length == 5 && id.equals(strings[0])) {
078 setLoc = strings;
079 break;
080 }
081 }
082
083 if (setEn != null && setLoc != null) {
084 byNameKeyCache.put(setEn[2], new String[] {setLoc[2], setLoc[1]});
085 // need to handle case where summer and winter have the same
086 // abbreviation, such as EST in Australia [1716305]
087 // we handle this by appending "-Summer", cf ZoneInfoCompiler
088 if (setEn[2].equals(setEn[4])) {
089 byNameKeyCache.put(setEn[4] + "-Summer", new String[] {setLoc[4], setLoc[3]});
090 } else {
091 byNameKeyCache.put(setEn[4], new String[] {setLoc[4], setLoc[3]});
092 }
093 }
094 }
095 return (String[]) byNameKeyCache.get(nameKey);
096 }
097
098 private HashMap createCache() {
099 return new HashMap(7);
100 }
101 }