93 lines
3.3 KiB
Java
93 lines
3.3 KiB
Java
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/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. The Android Open Source
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* Project designates this particular file as subject to the "Classpath"
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* exception as provided by The Android Open Source Project in the LICENSE
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* file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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package java.time.zone;
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import android.icu.util.TimeZone;
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import com.android.icu.util.ExtendedTimeZone;
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import java.util.Collections;
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import java.util.HashSet;
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import java.util.NavigableMap;
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import java.util.Set;
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import java.util.TreeMap;
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import libcore.util.BasicLruCache;
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/**
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* A ZoneRulesProvider that generates rules from ICU4J TimeZones.
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* This provider ensures that classes in {@link java.time} use the same time zone information
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* as ICU4J.
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*/
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public class IcuZoneRulesProvider extends ZoneRulesProvider {
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private final BasicLruCache<String, ZoneRules> cache = new ZoneRulesCache(8);
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@Override
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protected Set<String> provideZoneIds() {
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Set<String> zoneIds = TimeZone.getAvailableIDs(TimeZone.SystemTimeZoneType.ANY, null, null);
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zoneIds = new HashSet<>(zoneIds);
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// java.time assumes ZoneId that start with "GMT" fit the pattern "GMT+HH:mm:ss" which these
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// do not. Since they are equivalent to GMT, just remove these aliases.
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zoneIds.remove("GMT+0");
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zoneIds.remove("GMT-0");
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return zoneIds;
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}
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@Override
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protected ZoneRules provideRules(String zoneId, boolean forCaching) {
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// Ignore forCaching, as this is a static provider.
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return cache.get(zoneId);
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}
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@Override
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protected NavigableMap<String, ZoneRules> provideVersions(String zoneId) {
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return new TreeMap<>(
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Collections.singletonMap(TimeZone.getTZDataVersion(),
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provideRules(zoneId, /* forCaching */ false)));
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}
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static ZoneRules generateZoneRules(String zoneId) {
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return ExtendedTimeZone.getInstance(zoneId).createZoneRules();
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}
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private static class ZoneRulesCache extends BasicLruCache<String, ZoneRules> {
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ZoneRulesCache(int maxSize) {
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super(maxSize);
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}
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@Override
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protected ZoneRules create(String zoneId) {
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String canonicalId = TimeZone.getCanonicalID(zoneId);
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if (!canonicalId.equals(zoneId)) {
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// Return the same object as the canonical one, to avoid wasting space, but cache
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// it under the non-cannonical name as well, to avoid future getCanonicalID calls.
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return get(canonicalId);
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}
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return generateZoneRules(zoneId);
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}
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}
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}
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