1 /* 2 * Copyright (C) 2018 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.systemupdatersample.util; 18 19 import android.content.Context; 20 import android.util.Log; 21 22 import com.example.android.systemupdatersample.UpdateConfig; 23 24 import java.io.File; 25 import java.nio.charset.StandardCharsets; 26 import java.nio.file.Files; 27 import java.nio.file.Paths; 28 import java.util.ArrayList; 29 import java.util.Arrays; 30 import java.util.List; 31 import java.util.Optional; 32 33 /** 34 * Utility class for working with json update configurations. 35 */ 36 public final class UpdateConfigs { 37 38 public static final String UPDATE_CONFIGS_ROOT = "configs/"; 39 40 /** 41 * @param configs update configs 42 * @return list of names 43 */ configsToNames(List<UpdateConfig> configs)44 public static String[] configsToNames(List<UpdateConfig> configs) { 45 return configs.stream().map(UpdateConfig::getName).toArray(String[]::new); 46 } 47 48 /** 49 * @param context app context 50 * @return configs root directory 51 */ getConfigsRoot(Context context)52 public static String getConfigsRoot(Context context) { 53 return Paths 54 .get(context.getFilesDir().toString(), UPDATE_CONFIGS_ROOT) 55 .toString(); 56 } 57 58 /** 59 * @param context application context 60 * @return list of configs from directory {@link UpdateConfigs#getConfigsRoot} 61 */ getUpdateConfigs(Context context)62 public static List<UpdateConfig> getUpdateConfigs(Context context) { 63 File root = new File(getConfigsRoot(context)); 64 ArrayList<UpdateConfig> configs = new ArrayList<>(); 65 if (!root.exists()) { 66 return configs; 67 } 68 for (final File f : root.listFiles()) { 69 if (!f.isDirectory() && f.getName().endsWith(".json")) { 70 try { 71 String json = new String(Files.readAllBytes(f.toPath()), 72 StandardCharsets.UTF_8); 73 configs.add(UpdateConfig.fromJson(json)); 74 } catch (Exception e) { 75 Log.e("UpdateConfigs", "Can't read/parse config file " + f.getName(), e); 76 throw new RuntimeException( 77 "Can't read/parse config file " + f.getName(), e); 78 } 79 } 80 } 81 return configs; 82 } 83 84 /** 85 * @param filename searches by given filename 86 * @param config searches in {@link UpdateConfig#getAbConfig()} 87 * @return offset and size of {@code filename} in the package zip file 88 * stored as {@link UpdateConfig.PackageFile}. 89 */ getPropertyFile( final String filename, UpdateConfig config)90 public static Optional<UpdateConfig.PackageFile> getPropertyFile( 91 final String filename, 92 UpdateConfig config) { 93 return Arrays 94 .stream(config.getAbConfig().getPropertyFiles()) 95 .filter(file -> filename.equals(file.getFilename())) 96 .findFirst(); 97 } 98 UpdateConfigs()99 private UpdateConfigs() {} 100 } 101