1 files changed, 71 insertions, 0 deletions
diff --git a/core/java/android/timezone/TelephonyLookup.java b/core/java/android/timezone/TelephonyLookup.java
new file mode 100644
index 000000000000..39dbe85cb485
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+++ b/core/java/android/timezone/TelephonyLookup.java
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+/*
+ * 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;
+
+    @NonNull
+    private final libcore.timezone.TelephonyLookup mDelegate;
+
+    /**
+     * Obtains an instance for use when resolving telephony time zone information. This method never
+     * returns {@code null}.
+     */
+    @NonNull
+    public static TelephonyLookup getInstance() {
+        synchronized (sLock) {
+            if (sInstance == null) {
+                sInstance = new TelephonyLookup(libcore.timezone.TelephonyLookup.getInstance());
+            }
+            return sInstance;
+        }
+    }
+
+    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;
+    }
+}