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      1 /*
      2  * Copyright (C) 2018 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package libcore.util;
     18 
     19 import java.util.ArrayList;
     20 import java.util.Collections;
     21 import java.util.List;
     22 import libcore.util.CountryTimeZones.TimeZoneMapping;
     23 
     24 /**
     25  * An in-memory representation of country <-> time zone mapping data.
     26  */
     27 public final class CountryZonesFinder {
     28 
     29     private final List<CountryTimeZones> countryTimeZonesList;
     30 
     31     CountryZonesFinder(List<CountryTimeZones> countryTimeZonesList) {
     32         this.countryTimeZonesList = new ArrayList<>(countryTimeZonesList);
     33     }
     34 
     35     // VisibleForTesting
     36     public static CountryZonesFinder createForTests(List<CountryTimeZones> countryTimeZonesList) {
     37         return new CountryZonesFinder(countryTimeZonesList);
     38     }
     39 
     40     /**
     41      * Returns an immutable list of country ISO codes with time zones. The codes can be passed to
     42      * {@link #lookupCountryTimeZones(String)} and similar methods.
     43      */
     44     public List<String> lookupAllCountryIsoCodes() {
     45         List<String> isoCodes = new ArrayList<>(countryTimeZonesList.size());
     46         for (CountryTimeZones countryTimeZones : countryTimeZonesList) {
     47             isoCodes.add(countryTimeZones.getCountryIso());
     48         }
     49         return Collections.unmodifiableList(isoCodes);
     50     }
     51 
     52     /**
     53      * Returns an immutable list of {@link CountryTimeZones} for countries that use the specified
     54      * time zone. An exact, case-sensitive match is performed on the zone ID. This method never
     55      * returns null.
     56      */
     57     public List<CountryTimeZones> lookupCountryTimeZonesForZoneId(String zoneId) {
     58         List<CountryTimeZones> matches = new ArrayList<>(2);
     59         for (CountryTimeZones countryTimeZones : countryTimeZonesList) {
     60             boolean match = TimeZoneMapping.containsTimeZoneId(
     61                     countryTimeZones.getTimeZoneMappings(), zoneId);
     62             if (match) {
     63                 matches.add(countryTimeZones);
     64             }
     65         }
     66         return Collections.unmodifiableList(matches);
     67     }
     68 
     69     /**
     70      * Returns a {@link CountryTimeZones} object associated with the specified country code. If one
     71      * cannot be found this method returns {@code null}.
     72      */
     73     public CountryTimeZones lookupCountryTimeZones(String countryIso) {
     74         String normalizedCountryIso = TimeZoneFinder.normalizeCountryIso(countryIso);
     75         for (CountryTimeZones countryTimeZones : countryTimeZonesList) {
     76             if (countryTimeZones.getCountryIso().equals(normalizedCountryIso)) {
     77                 return countryTimeZones;
     78             }
     79         }
     80         return null;
     81     }
     82 }
     83