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     */
016    package org.joda.time.tz;
017    
018    import java.text.DateFormatSymbols;
019    import java.util.HashMap;
020    import 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     */
031    public 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    }