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      1 /*
      2  * Copyright (C) 2016 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 package com.android.providers.blockednumber;
     17 
     18 import android.annotation.NonNull;
     19 import android.annotation.Nullable;
     20 import android.content.Context;
     21 import android.location.Country;
     22 import android.location.CountryDetector;
     23 import android.telephony.PhoneNumberUtils;
     24 import android.text.TextUtils;
     25 
     26 import java.util.Locale;
     27 
     28 public class Utils {
     29     private Utils() {
     30     }
     31 
     32     public static final int MIN_INDEX_LEN = 8;
     33 
     34     /**
     35      * @return The current country code.
     36      */
     37     public static @NonNull String getCurrentCountryIso(@NonNull Context context) {
     38         final CountryDetector detector = (CountryDetector) context.getSystemService(
     39                 Context.COUNTRY_DETECTOR);
     40         if (detector != null) {
     41             final Country country = detector.detectCountry();
     42             if (country != null) {
     43                 return country.getCountryIso();
     44             }
     45         }
     46         final Locale locale = context.getResources().getConfiguration().locale;
     47         return locale.getCountry();
     48     }
     49 
     50     /**
     51      * Converts a phone number to an E164 number, assuming the current country.  If {@code
     52      * incomingE16Number} is provided, it'll just strip it and returns.  If the number is not valid,
     53      * it'll return "".
     54      *
     55      * <p>Special case: if {@code rawNumber} contains '@', it's considered as an email address and
     56      * returned unmodified.
     57      */
     58     public static @NonNull String getE164Number(@NonNull Context context,
     59             @Nullable String rawNumber, @Nullable String incomingE16Number) {
     60         if (rawNumber != null && rawNumber.contains("@")) {
     61             return rawNumber;
     62         }
     63         if (!TextUtils.isEmpty(incomingE16Number)) {
     64             return incomingE16Number;
     65         }
     66         if (TextUtils.isEmpty(rawNumber)) {
     67             return "";
     68         }
     69         final String e164 =
     70                 PhoneNumberUtils.formatNumberToE164(rawNumber, getCurrentCountryIso(context));
     71         return e164 == null ? "" : e164;
     72     }
     73 
     74     public static @Nullable String wrapSelectionWithParens(@Nullable String selection) {
     75         return TextUtils.isEmpty(selection) ? null : "(" + selection + ")";
     76     }
     77 }
     78