1 /* 2 * Copyright (C) 2017 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 17 package com.android.dialer.assisteddialing; 18 19 import android.text.TextUtils; 20 import com.android.dialer.common.LogUtil; 21 import com.android.dialer.strictmode.StrictModeUtils; 22 import com.google.i18n.phonenumbers.NumberParseException; 23 import com.google.i18n.phonenumbers.PhoneNumberUtil; 24 import com.google.i18n.phonenumbers.Phonenumber.PhoneNumber; 25 import java.util.Optional; 26 27 /** Responsible for transforming numbers to make them dialable and valid when roaming. */ 28 final class NumberTransformer { 29 30 private final PhoneNumberUtil phoneNumberUtil; 31 private final Constraints constraints; 32 NumberTransformer(Constraints constraints)33 NumberTransformer(Constraints constraints) { 34 this.constraints = constraints; 35 this.phoneNumberUtil = StrictModeUtils.bypass(PhoneNumberUtil::getInstance); 36 } 37 38 /** 39 * A method to do assisted dialing transformations. 40 * 41 * <p>The library will do its best to attempt a transformation, but, if for any reason the 42 * transformation fails, we return an empty optional. The operation can be considered a success 43 * when the Optional we return has a value set. 44 */ doAssistedDialingTransformation( String numbertoTransform, String userHomeCountryCode, String userRoamingCountryCode)45 Optional<TransformationInfo> doAssistedDialingTransformation( 46 String numbertoTransform, String userHomeCountryCode, String userRoamingCountryCode) { 47 48 if (!constraints.meetsPreconditions( 49 numbertoTransform, userHomeCountryCode, userRoamingCountryCode)) { 50 LogUtil.i( 51 "NumberTransformer.doAssistedDialingTransformation", 52 "assisted dialing failed preconditions"); 53 return Optional.empty(); 54 } 55 56 PhoneNumber phoneNumber = 57 StrictModeUtils.bypass( 58 () -> { 59 try { 60 return phoneNumberUtil.parse(numbertoTransform, userHomeCountryCode); 61 } catch (NumberParseException e) { 62 LogUtil.i( 63 "NumberTransformer.doAssistedDialingTransformation", "number failed to parse"); 64 return null; 65 } 66 }); 67 68 if (phoneNumber == null) { 69 return Optional.empty(); 70 } 71 72 String transformedNumber = 73 StrictModeUtils.bypass( 74 () -> 75 phoneNumberUtil.formatNumberForMobileDialing( 76 phoneNumber, userRoamingCountryCode, true)); 77 78 // formatNumberForMobileDialing may return an empty String. 79 if (TextUtils.isEmpty(transformedNumber)) { 80 LogUtil.i( 81 "NumberTransformer.doAssistedDialingTransformation", 82 "formatNumberForMobileDialing returned an empty string"); 83 return Optional.empty(); 84 } 85 86 // TODO Verify the transformed number is still valid? 87 return Optional.of( 88 TransformationInfo.builder() 89 .setOriginalNumber(numbertoTransform) 90 .setTransformedNumber(transformedNumber) 91 .setUserHomeCountryCode(userHomeCountryCode) 92 .setUserRoamingCountryCode(userRoamingCountryCode) 93 .setTransformedNumberCountryCallingCode(phoneNumber.getCountryCode()) 94 .build()); 95 } 96 } 97