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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package sun.util;

import java.lang.ref.SoftReference;
import java.util.Enumeration;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.MissingResourceException;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.spi.TimeZoneNameProvider;
import sun.util.calendar.ZoneInfo;
import sun.util.resources.LocaleData;
import sun.util.resources.OpenListResourceBundle;

Utility class that deals with the localized time zone names
/** * Utility class that deals with the localized time zone names */
public final class TimeZoneNameUtility {
cache to hold time zone resource bundles. Keyed by Locale
/** * cache to hold time zone resource bundles. Keyed by Locale */
private static ConcurrentHashMap<Locale, SoftReference<OpenListResourceBundle>> cachedBundles = new ConcurrentHashMap<Locale, SoftReference<OpenListResourceBundle>>();
cache to hold time zone localized strings. Keyed by Locale
/** * cache to hold time zone localized strings. Keyed by Locale */
private static ConcurrentHashMap<Locale, SoftReference<String[][]>> cachedZoneData = new ConcurrentHashMap<Locale, SoftReference<String[][]>>();
get time zone localized strings. Enumerate all keys.
/** * get time zone localized strings. Enumerate all keys. */
public static final String[][] getZoneStrings(Locale locale) { String[][] zones; SoftReference<String[][]> data = cachedZoneData.get(locale); if (data == null || ((zones = data.get()) == null)) { zones = loadZoneStrings(locale); data = new SoftReference<String[][]>(zones); cachedZoneData.put(locale, data); } return zones; } private static final String[][] loadZoneStrings(Locale locale) { List<String[]> zones = new LinkedList<String[]>(); OpenListResourceBundle rb = getBundle(locale); Enumeration<String> keys = rb.getKeys(); String[] names = null; while(keys.hasMoreElements()) { String key = keys.nextElement(); names = retrieveDisplayNames(rb, key, locale); if (names != null) { zones.add(names); } } String[][] zonesArray = new String[zones.size()][]; return zones.toArray(zonesArray); }
Retrieve display names for a time zone ID.
/** * Retrieve display names for a time zone ID. */
public static final String[] retrieveDisplayNames(String id, Locale locale) { OpenListResourceBundle rb = getBundle(locale); return retrieveDisplayNames(rb, id, locale); } private static final String[] retrieveDisplayNames(OpenListResourceBundle rb, String id, Locale locale) { LocaleServiceProviderPool pool = LocaleServiceProviderPool.getPool(TimeZoneNameProvider.class); String[] names = null; // Check whether a provider can provide an implementation that's closer // to the requested locale than what the Java runtime itself can provide. if (pool.hasProviders()) { names = pool.getLocalizedObject( TimeZoneNameGetter.INSTANCE, locale, rb, id); } if (names == null) { try { names = rb.getStringArray(id); } catch (MissingResourceException mre) { // fall through } } return names; } private static final OpenListResourceBundle getBundle(Locale locale) { OpenListResourceBundle rb; SoftReference<OpenListResourceBundle> data = cachedBundles.get(locale); if (data == null || ((rb = data.get()) == null)) { rb = LocaleData.getTimeZoneNames(locale); data = new SoftReference<OpenListResourceBundle>(rb); cachedBundles.put(locale, data); } return rb; }
Obtains a localized time zone strings from a TimeZoneNameProvider implementation.
/** * Obtains a localized time zone strings from a TimeZoneNameProvider * implementation. */
private static class TimeZoneNameGetter implements LocaleServiceProviderPool.LocalizedObjectGetter<TimeZoneNameProvider, String[]>{ private static final TimeZoneNameGetter INSTANCE = new TimeZoneNameGetter(); public String[] getObject(TimeZoneNameProvider timeZoneNameProvider, Locale locale, String requestID, Object... params) { assert params.length == 0; String[] names = null; String queryID = requestID; if (queryID.equals("GMT")) { names = buildZoneStrings(timeZoneNameProvider, locale, queryID); } else { Map<String, String> aliases = ZoneInfo.getAliasTable(); if (aliases != null) { // Check whether this id is an alias, if so, // look for the standard id. if (aliases.containsKey(queryID)) { String prevID = queryID; while ((queryID = aliases.get(queryID)) != null) { prevID = queryID; } queryID = prevID; } names = buildZoneStrings(timeZoneNameProvider, locale, queryID); if (names == null) { // There may be a case that a standard id has become an // alias. so, check the aliases backward. names = examineAliases(timeZoneNameProvider, locale, queryID, aliases, aliases.entrySet()); } } } if (names != null) { names[0] = requestID; } return names; } private static String[] examineAliases(TimeZoneNameProvider tznp, Locale locale, String id, Map<String, String> aliases, Set<Map.Entry<String, String>> aliasesSet) { if (aliases.containsValue(id)) { for (Map.Entry<String, String> entry : aliasesSet) { if (entry.getValue().equals(id)) { String alias = entry.getKey(); String[] names = buildZoneStrings(tznp, locale, alias); if (names != null) { return names; } else { names = examineAliases(tznp, locale, alias, aliases, aliasesSet); if (names != null) { return names; } } } } } return null; } private static String[] buildZoneStrings(TimeZoneNameProvider tznp, Locale locale, String id) { String[] names = new String[5]; for (int i = 1; i <= 4; i ++) { names[i] = tznp.getDisplayName(id, i>=3, i%2, locale); if (i >= 3 && names[i] == null) { names[i] = names[i-2]; } } if (names[1] == null) { // this id seems not localized by this provider names = null; } return names; } } }