/* * Copyright (C) 2018 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.android.settings.datetime.timezone.model; import androidx.annotation.VisibleForTesting; import androidx.collection.ArraySet; import com.android.i18n.timezone.CountryTimeZones; import com.android.i18n.timezone.CountryZonesFinder; import com.android.i18n.timezone.TimeZoneFinder; import java.lang.ref.WeakReference; import java.util.Collections; import java.util.HashSet; import java.util.List; import java.util.Locale; import java.util.Set; /** * Wrapper of CountryZonesFinder to normalize the country code and only show the regions that are * has time zone shown in the time zone picker. * getInstance() reads the data from underlying file, and this means it should not be called * from the UI thread. */ public class TimeZoneData { private static WeakReference sCache = null; private final CountryZonesFinder mCountryZonesFinder; private final Set mRegionIds; public static synchronized TimeZoneData getInstance() { TimeZoneData data = sCache == null ? null : sCache.get(); if (data != null) { return data; } data = new TimeZoneData(TimeZoneFinder.getInstance().getCountryZonesFinder()); sCache = new WeakReference<>(data); return data; } @VisibleForTesting public TimeZoneData(CountryZonesFinder countryZonesFinder) { mCountryZonesFinder = countryZonesFinder; mRegionIds = getNormalizedRegionIds(mCountryZonesFinder.lookupAllCountryIsoCodes()); } public Set getRegionIds() { return mRegionIds; } public Set lookupCountryCodesForZoneId(String tzId) { if (tzId == null) { return Collections.emptySet(); } List countryTimeZones = mCountryZonesFinder .lookupCountryTimeZonesForZoneId(tzId); Set regionIds = new ArraySet<>(); for (CountryTimeZones countryTimeZone : countryTimeZones) { FilteredCountryTimeZones filteredZones = new FilteredCountryTimeZones(countryTimeZone); if (filteredZones.matches(tzId)) { regionIds.add(filteredZones.getRegionId()); } } return regionIds; } public FilteredCountryTimeZones lookupCountryTimeZones(String regionId) { CountryTimeZones finder = regionId == null ? null : mCountryZonesFinder.lookupCountryTimeZones(regionId); return finder == null ? null : new FilteredCountryTimeZones(finder); } private static Set getNormalizedRegionIds(List regionIds) { final Set result = new HashSet<>(regionIds.size()); for (String regionId : regionIds) { result.add(normalizeRegionId(regionId)); } return Collections.unmodifiableSet(result); } // Uppercase ASCII is normalized for the purpose of using ICU API public static String normalizeRegionId(String regionId) { return regionId == null ? null : regionId.toUpperCase(Locale.US); } }