Add the assisted dialing logic module.

This implements the core assisted dialing logic specified in
go/assisted-dialing-dd-v1

Bug: 36414469,63995261
Test: new unit tests
PiperOrigin-RevId: 170232634
Change-Id: I3b668c3a0e9fb5398eca4614548c8141b200e70e

1 files changed, 73 insertions, 0 deletions

diff --git a/java/com/android/dialer/assisteddialing/LocationDetector.java b/java/com/android/dialer/assisteddialing/LocationDetector.java
new file mode 100644
index 000000000..684068912
--- /dev/null
+++ b/java/com/android/dialer/assisteddialing/LocationDetector.java
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2017 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 com.android.dialer.assisteddialing;
+
+import android.annotation.TargetApi;
+import android.os.Build.VERSION_CODES;
+import android.support.annotation.NonNull;
+import android.telephony.TelephonyManager;
+import com.android.dialer.common.LogUtil;
+import java.util.Locale;
+import java.util.Optional;
+
+// TODO(erfanian): Improve definition of roaming and home country in finalized API.
+/**
+ * LocationDetector is responsible for determining the Roaming location of the User, in addition to
+ * User's home country.
+ */
+final class LocationDetector {
+
+  private final TelephonyManager telephonyManager;
+
+  public LocationDetector(@NonNull TelephonyManager telephonyManager) {
+    if (telephonyManager == null) {
+      throw new NullPointerException("Provided TelephonyManager was null");
+    }
+    this.telephonyManager = telephonyManager;
+  }
+
+  // TODO(erfanian):  confirm this is based on ISO 3166-1 alpha-2. libphonenumber expects Unicode's
+  // CLDR
+  // TODO(erfanian):  confirm these are still valid in a multi-sim environment.
+  /**
+   * Returns what we believe to be the User's home country. This should resolve to
+   * PROPERTY_ICC_OPERATOR_ISO_COUNTRY
+   */
+  @SuppressWarnings("AndroidApiChecker") // Use of optional
+  @TargetApi(VERSION_CODES.N)
+  public Optional<String> getUpperCaseUserHomeCountry() {
+    String simCountryIso = telephonyManager.getSimCountryIso();
+    if (simCountryIso != null) {
+      return Optional.of(telephonyManager.getSimCountryIso().toUpperCase(Locale.US));
+    }
+    LogUtil.i("LocationDetector.getUpperCaseUserHomeCountry", "user home country was null");
+    return Optional.empty();
+  }
+
+  /** Returns what we believe to be the User's current (roaming) country */
+  @SuppressWarnings("AndroidApiChecker") // Use of optional
+  @TargetApi(VERSION_CODES.N)
+  public Optional<String> getUpperCaseUserRoamingCountry() {
+    // TODO Increase coverage of location resolution??
+    String networkCountryIso = telephonyManager.getNetworkCountryIso();
+    if (networkCountryIso != null) {
+      return Optional.of(telephonyManager.getNetworkCountryIso().toUpperCase(Locale.US));
+    }
+    LogUtil.i("LocationDetector.getUpperCaseUserRoamingCountry", "user roaming country was null");
+    return Optional.empty();
+  }
+}