| /* |
| * Copyright (C) 2019 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 android.timezone; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.annotation.SystemApi; |
| |
| import com.android.internal.annotations.GuardedBy; |
| |
| import java.util.Objects; |
| |
| /** |
| * A class that can find time zone-related information about telephony networks. |
| * |
| * @hide |
| */ |
| @SystemApi(client = SystemApi.Client.MODULE_LIBRARIES) |
| public class TelephonyLookup { |
| |
| private static Object sLock = new Object(); |
| @GuardedBy("sLock") |
| private static TelephonyLookup sInstance; |
| |
| /** |
| * Obtains an instance for use when resolving telephony time zone information. |
| */ |
| @NonNull |
| public static TelephonyLookup getInstance() { |
| synchronized (sLock) { |
| if (sInstance == null) { |
| sInstance = new TelephonyLookup(libcore.timezone.TelephonyLookup.getInstance()); |
| } |
| return sInstance; |
| } |
| } |
| |
| @NonNull |
| private final libcore.timezone.TelephonyLookup mDelegate; |
| |
| private TelephonyLookup(@NonNull libcore.timezone.TelephonyLookup delegate) { |
| mDelegate = Objects.requireNonNull(delegate); |
| } |
| |
| /** |
| * Returns an object capable of querying telephony network information. This method can return |
| * {@code null} in the event of an error while reading the underlying data files. |
| */ |
| @Nullable |
| public TelephonyNetworkFinder getTelephonyNetworkFinder() { |
| libcore.timezone.TelephonyNetworkFinder telephonyNetworkFinderDelegate = |
| mDelegate.getTelephonyNetworkFinder(); |
| return telephonyNetworkFinderDelegate != null |
| ? new TelephonyNetworkFinder(telephonyNetworkFinderDelegate) : null; |
| } |
| } |