001/*
002 *  Copyright 2001-2005 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 */
016package org.joda.time.tz;
017
018import java.text.DateFormatSymbols;
019import java.util.HashMap;
020import java.util.Locale;
021
022/**
023 * The default name provider acquires localized names from
024 * {@link DateFormatSymbols java.text.DateFormatSymbols}.
025 * <p>
026 * DefaultNameProvider is thread-safe and immutable.
027 *
028 * @author Brian S O'Neill
029 * @since 1.0
030 */
031public class DefaultNameProvider implements NameProvider {
032    // locale -> (id -> (nameKey -> [shortName, name]))
033    private HashMap iByLocaleCache = createCache();
034
035    public DefaultNameProvider() {
036    }
037
038    public String getShortName(Locale locale, String id, String nameKey) {
039        String[] nameSet = getNameSet(locale, id, nameKey);
040        return nameSet == null ? null : nameSet[0];
041    }
042    
043    public String getName(Locale locale, String id, String nameKey) {
044        String[] nameSet = getNameSet(locale, id, nameKey);
045        return nameSet == null ? null : nameSet[1];
046    }
047
048    private synchronized String[] getNameSet(Locale locale, String id, String nameKey) {
049        if (locale == null || id == null || nameKey == null) {
050            return null;
051        }
052
053        HashMap byIdCache = (HashMap)iByLocaleCache.get(locale);
054        if (byIdCache == null) {
055            iByLocaleCache.put(locale, byIdCache = createCache());
056        }
057
058        HashMap byNameKeyCache = (HashMap)byIdCache.get(id);
059        if (byNameKeyCache == null) {
060            byIdCache.put(id, byNameKeyCache = createCache());
061            String[][] zoneStrings = new DateFormatSymbols(locale).getZoneStrings();
062            for (int i=0; i<zoneStrings.length; i++) {
063                String[] set = zoneStrings[i];
064                if (set != null && set.length == 5 && id.equals(set[0])) {
065                    byNameKeyCache.put(set[2], new String[] {set[2], set[1]});
066                    // need to handle case where summer and winter have the same
067                    // abbreviation, such as EST in Australia [1716305]
068                    // we handle this by appending "-Summer", cf ZoneInfoCompiler
069                    if (set[2].equals(set[4])) {
070                        byNameKeyCache.put(set[4] + "-Summer", new String[] {set[4], set[3]});
071                    } else {
072                        byNameKeyCache.put(set[4], new String[] {set[4], set[3]});
073                    }
074                    break;
075                }
076            }
077        }
078
079        return (String[])byNameKeyCache.get(nameKey);
080    }
081
082    private HashMap createCache() {
083        return new HashMap(7);
084    }
085}