1 /* 2 * Copyright (C) 2019 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 android.timezone; 18 19 import android.annotation.NonNull; 20 import android.annotation.Nullable; 21 22 import com.android.internal.annotations.GuardedBy; 23 24 import java.util.Objects; 25 26 /** 27 * A class that can be used to find time zones using information like country and offset. 28 * 29 * @hide 30 */ 31 public final class TimeZoneFinder { 32 33 private static final Object sLock = new Object(); 34 @GuardedBy("sLock") 35 private static TimeZoneFinder sInstance; 36 37 /** 38 * Obtains the singleton instance. 39 */ 40 @NonNull getInstance()41 public static TimeZoneFinder getInstance() { 42 synchronized (sLock) { 43 if (sInstance == null) { 44 sInstance = new TimeZoneFinder(com.android.i18n.timezone.TimeZoneFinder 45 .getInstance()); 46 } 47 } 48 return sInstance; 49 } 50 51 @NonNull 52 private final com.android.i18n.timezone.TimeZoneFinder mDelegate; 53 TimeZoneFinder(@onNull com.android.i18n.timezone.TimeZoneFinder delegate)54 private TimeZoneFinder(@NonNull com.android.i18n.timezone.TimeZoneFinder delegate) { 55 mDelegate = Objects.requireNonNull(delegate); 56 } 57 58 /** 59 * Returns the IANA rules version associated with the data. If there is no version information 60 * or there is a problem reading the file then {@code null} is returned. 61 */ 62 @Nullable getIanaVersion()63 public String getIanaVersion() { 64 return mDelegate.getIanaVersion(); 65 } 66 67 /** 68 * Returns a {@link CountryTimeZones} object associated with the specified country code. 69 * Caching is handled as needed. If the country code is not recognized or there is an error 70 * during lookup this method can return null. 71 */ 72 @Nullable lookupCountryTimeZones(@onNull String countryIso)73 public CountryTimeZones lookupCountryTimeZones(@NonNull String countryIso) { 74 com.android.i18n.timezone.CountryTimeZones delegate = mDelegate 75 .lookupCountryTimeZones(countryIso); 76 return delegate == null ? null : new CountryTimeZones(delegate); 77 } 78 } 79