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.example.android.autofill.service.data.source.local.db; 18 19 import android.arch.persistence.room.TypeConverter; 20 21 import java.util.Arrays; 22 import java.util.List; 23 24 import static java.util.stream.Collectors.toList; 25 26 /** 27 * Type converter for Room database. 28 */ 29 public class Converters { 30 31 /** 32 * If database returns a {@link String} containing a comma delimited list of ints, this converts 33 * the {@link String} to an {@link IntList}. 34 */ 35 @TypeConverter 36 public static IntList storedStringToIntList(String value) { 37 List<String> strings = Arrays.asList(value.split("\\s*,\\s*")); 38 List<Integer> ints = strings.stream().map(Integer::parseInt).collect(toList()); 39 return new IntList(ints); 40 } 41 42 /** 43 * Converts the {@link IntList} back into a String containing a comma delimited list of 44 * ints. 45 */ 46 @TypeConverter 47 public static String intListToStoredString(IntList list) { 48 StringBuilder stringBuilder = new StringBuilder(); 49 for (Integer integer : list.ints) { 50 stringBuilder.append(integer).append(","); 51 } 52 return stringBuilder.toString(); 53 } 54 55 /** 56 * If database returns a {@link String} containing a comma delimited list of Strings, this 57 * converts the {@link String} to a {@link StringList}. 58 */ 59 @TypeConverter 60 public static StringList storedStringToStringList(String value) { 61 List<String> strings = Arrays.asList(value.split("\\s*,\\s*")); 62 return new StringList(strings); 63 } 64 65 66 /** 67 * Converts the {@link StringList} back into a {@link String} containing a comma delimited 68 * list of {@link String}s. 69 */ 70 @TypeConverter 71 public static String stringListToStoredString(StringList list) { 72 StringBuilder stringBuilder = new StringBuilder(); 73 for (String string : list.strings) { 74 stringBuilder.append(string).append(","); 75 } 76 return stringBuilder.toString(); 77 } 78 79 /** 80 * Wrapper class for {@code List<Integer>} so it can work with Room type converters. 81 */ 82 public static class IntList { 83 public final List<Integer> ints; 84 85 public IntList(List<Integer> ints) { 86 this.ints = ints; 87 } 88 } 89 90 /** 91 * Wrapper class for {@code List<String>} so it can work with Room type converters. 92 */ 93 public static class StringList { 94 public final List<String> strings; 95 96 public StringList(List<String> ints) { 97 this.strings = ints; 98 } 99 } 100 } 101
