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 find time zone-related information about telephony networks. 28 * 29 * @hide 30 */ 31 public final class TelephonyLookup { 32 33 private static final Object sLock = new Object(); 34 @GuardedBy("sLock") 35 private static TelephonyLookup sInstance; 36 37 /** 38 * Obtains an instance for use when resolving telephony time zone information. 39 */ 40 @NonNull getInstance()41 public static TelephonyLookup getInstance() { 42 synchronized (sLock) { 43 if (sInstance == null) { 44 sInstance = new TelephonyLookup(com.android.i18n.timezone.TelephonyLookup 45 .getInstance()); 46 } 47 return sInstance; 48 } 49 } 50 51 @NonNull 52 private final com.android.i18n.timezone.TelephonyLookup mDelegate; 53 TelephonyLookup(@onNull com.android.i18n.timezone.TelephonyLookup delegate)54 private TelephonyLookup(@NonNull com.android.i18n.timezone.TelephonyLookup delegate) { 55 mDelegate = Objects.requireNonNull(delegate); 56 } 57 58 /** 59 * Returns an object capable of querying telephony network information. This method can return 60 * {@code null} in the event of an error while reading the underlying data files. 61 */ 62 @Nullable getTelephonyNetworkFinder()63 public TelephonyNetworkFinder getTelephonyNetworkFinder() { 64 com.android.i18n.timezone.TelephonyNetworkFinder telephonyNetworkFinderDelegate = 65 mDelegate.getTelephonyNetworkFinder(); 66 return telephonyNetworkFinderDelegate != null 67 ? new TelephonyNetworkFinder(telephonyNetworkFinderDelegate) : null; 68 } 69 } 70