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/*
* 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 android.support.annotation.VisibleForTesting;
import android.support.v4.util.ArraySet;
import libcore.util.CountryTimeZones;
import libcore.util.CountryZonesFinder;
import libcore.util.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<TimeZoneData> sCache = null;
private final CountryZonesFinder mCountryZonesFinder;
private final Set<String> 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<String> getRegionIds() {
return mRegionIds;
}
public Set<String> lookupCountryCodesForZoneId(String tzId) {
if (tzId == null) {
return Collections.emptySet();
}
List<CountryTimeZones> countryTimeZones = mCountryZonesFinder
.lookupCountryTimeZonesForZoneId(tzId);
Set<String> regionIds = new ArraySet<>();
for (CountryTimeZones countryTimeZone : countryTimeZones) {
FilteredCountryTimeZones filteredZones = new FilteredCountryTimeZones(countryTimeZone);
if (filteredZones.getTimeZoneIds().contains(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<String> getNormalizedRegionIds(List<String> regionIds) {
final Set<String> 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);
}
}
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