001 /*
002 * Copyright 2001-2009 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 String[][] zoneStrings = DateTimeUtils.getDateFormatSymbols(locale).getZoneStrings();
066 for (int i=0; i<zoneStrings.length; i++) {
067 String[] set = zoneStrings[i];
068 if (set != null && set.length == 5 && id.equals(set[0])) {
069 byNameKeyCache.put(set[2], new String[] {set[2], set[1]});
070 // need to handle case where summer and winter have the same
071 // abbreviation, such as EST in Australia [1716305]
072 // we handle this by appending "-Summer", cf ZoneInfoCompiler
073 if (set[2].equals(set[4])) {
074 byNameKeyCache.put(set[4] + "-Summer", new String[] {set[4], set[3]});
075 } else {
076 byNameKeyCache.put(set[4], new String[] {set[4], set[3]});
077 }
078 break;
079 }
080 }
081 }
082
083 return (String[])byNameKeyCache.get(nameKey);
084 }
085
086 private HashMap createCache() {
087 return new HashMap(7);
088 }
089 }