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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.i18n.timezone;
import static com.android.i18n.timezone.XmlUtils.normalizeCountryIso;
import com.android.i18n.timezone.CountryTimeZones.TimeZoneMapping;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* An in-memory representation of country <-> time zone mapping data.
* @hide
*/
@libcore.api.CorePlatformApi
public final class CountryZonesFinder {
private final List<CountryTimeZones> countryTimeZonesList;
CountryZonesFinder(List<CountryTimeZones> countryTimeZonesList) {
this.countryTimeZonesList = new ArrayList<>(countryTimeZonesList);
}
// VisibleForTesting
public static CountryZonesFinder createForTests(List<CountryTimeZones> countryTimeZonesList) {
return new CountryZonesFinder(countryTimeZonesList);
}
/**
* Returns an immutable list of country ISO codes with time zones. The codes can be passed to
* {@link #lookupCountryTimeZones(String)} and similar methods.
*/
@libcore.api.CorePlatformApi
public List<String> lookupAllCountryIsoCodes() {
List<String> isoCodes = new ArrayList<>(countryTimeZonesList.size());
for (CountryTimeZones countryTimeZones : countryTimeZonesList) {
isoCodes.add(countryTimeZones.getCountryIso());
}
return Collections.unmodifiableList(isoCodes);
}
/**
* Returns an immutable list of {@link CountryTimeZones} for countries that use the specified
* time zone. An exact, case-sensitive match is performed on the zone ID. If the match but the method also
* checks for alternative zone IDs. This method never returns null and will usually return a
* list containing a single element. It can return an empty list if the zone ID is
* not recognized or it is not associated with a country.
*/
@libcore.api.CorePlatformApi
public List<CountryTimeZones> lookupCountryTimeZonesForZoneId(String zoneId) {
List<CountryTimeZones> matches = new ArrayList<>(2);
// This implementation is deliberately flexible about supporting alternative (newer or
// legacy) IDs, e.g. zoneId might have come from the device's persist.sys.timezone setting,
// which may have been set before a tzdb upgrade, so we look at alternative IDs and accept
// them too. Most of the ~250 countries have a small number of zones (most have 1-2, the max
// is ~30), and most zones do not have an alternative ID, those that do have 1-2.
for (CountryTimeZones countryTimeZones : countryTimeZonesList) {
boolean match = false;
// We get all time zone mappings, even those with a notafter= value to ensure the most
// complete search.
List<TimeZoneMapping> countryTimeZoneMappings = countryTimeZones.getTimeZoneMappings();
for (TimeZoneMapping timeZoneMapping : countryTimeZoneMappings) {
if (timeZoneMapping.getTimeZoneId().equals(zoneId)
|| timeZoneMapping.getAlternativeIds().contains(zoneId)) {
match = true;
break;
}
}
if (match) {
matches.add(countryTimeZones);
}
}
return Collections.unmodifiableList(matches);
}
/**
* Returns a {@link CountryTimeZones} object associated with the specified country code. If one
* cannot be found this method returns {@code null}.
*/
@libcore.api.CorePlatformApi
public CountryTimeZones lookupCountryTimeZones(String countryIso) {
String normalizedCountryIso = normalizeCountryIso(countryIso);
for (CountryTimeZones countryTimeZones : countryTimeZonesList) {
if (countryTimeZones.getCountryIso().equals(normalizedCountryIso)) {
return countryTimeZones;
}
}
return null;
}
}
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