System API proxies for the telephony module
Introduce classes that exist to give the telephony module something
stable to call for in-process utilities: libcore cannot directly expose
System APIs today and the package names are internal. The APIs are the
subset of internal libcore.timezone APIs used by telephony code
currently.
Bug: 139091367
Test: See associated frameworks/opt/telephony commit
Merged-In: I6109aef77171346ecb103c190526b7b9b81012b2
Change-Id: I6109aef77171346ecb103c190526b7b9b81012b2
(cherry picked from commit 944aeffa85ab0a94e20a4edc7293fe70f904bddd)
diff --git a/core/java/android/timezone/TimeZoneFinder.java b/core/java/android/timezone/TimeZoneFinder.java
new file mode 100644
index 0000000..15dfe62
--- /dev/null
+++ b/core/java/android/timezone/TimeZoneFinder.java
@@ -0,0 +1,67 @@
+/*
+ * 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;
+
+/**
+ * A class that can be used to find time zones.
+ *
+ * @hide
+ */
+@SystemApi(client = SystemApi.Client.MODULE_LIBRARIES)
+public final class TimeZoneFinder {
+
+ private static Object sLock = new Object();
+ @GuardedBy("sLock")
+ private static TimeZoneFinder sInstance;
+
+ private final libcore.timezone.TimeZoneFinder mDelegate;
+
+ private TimeZoneFinder(libcore.timezone.TimeZoneFinder delegate) {
+ mDelegate = delegate;
+ }
+
+ /**
+ * Obtains an instance for use when resolving telephony time zone information. This method never
+ * returns {@code null}.
+ */
+ @NonNull
+ public static TimeZoneFinder getInstance() {
+ synchronized (sLock) {
+ if (sInstance == null) {
+ sInstance = new TimeZoneFinder(libcore.timezone.TimeZoneFinder.getInstance());
+ }
+ }
+ return sInstance;
+ }
+
+ /**
+ * Returns a {@link CountryTimeZones} object associated with the specified country code.
+ * Caching is handled as needed. If the country code is not recognized or there is an error
+ * during lookup this method can return null.
+ */
+ @Nullable
+ public CountryTimeZones lookupCountryTimeZones(@NonNull String countryIso) {
+ libcore.timezone.CountryTimeZones delegate = mDelegate.lookupCountryTimeZones(countryIso);
+ return delegate == null ? null : new CountryTimeZones(delegate);
+ }
+}