| /* |
| * Copyright (C) 2018 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.example.android.systemupdatersample.util; |
| |
| import android.content.Context; |
| |
| import com.example.android.systemupdatersample.UpdateConfig; |
| |
| import java.io.File; |
| import java.nio.charset.StandardCharsets; |
| import java.nio.file.Files; |
| import java.nio.file.Paths; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Utility class for working with json update configurations. |
| */ |
| public final class UpdateConfigs { |
| |
| private static final String UPDATE_CONFIGS_ROOT = "configs/"; |
| |
| /** |
| * @param configs update configs |
| * @return list of names |
| */ |
| public static String[] configsToNames(List<UpdateConfig> configs) { |
| return configs.stream().map(UpdateConfig::getName).toArray(String[]::new); |
| } |
| |
| /** |
| * @param context app context |
| * @return configs root directory |
| */ |
| public static String getConfigsRoot(Context context) { |
| return Paths.get(context.getFilesDir().toString(), |
| UPDATE_CONFIGS_ROOT).toString(); |
| } |
| |
| /** |
| * It parses only {@code .json} files. |
| * |
| * @param context application context |
| * @return list of configs from directory {@link UpdateConfigs#getConfigsRoot} |
| */ |
| public static List<UpdateConfig> getUpdateConfigs(Context context) { |
| File root = new File(getConfigsRoot(context)); |
| ArrayList<UpdateConfig> configs = new ArrayList<>(); |
| if (!root.exists()) { |
| return configs; |
| } |
| for (final File f : root.listFiles()) { |
| if (!f.isDirectory() && f.getName().endsWith(".json")) { |
| try { |
| String json = new String(Files.readAllBytes(f.toPath()), |
| StandardCharsets.UTF_8); |
| configs.add(UpdateConfig.fromJson(json)); |
| } catch (Exception e) { |
| throw new RuntimeException( |
| "Can't read/parse config file " + f.getName(), e); |
| } |
| } |
| } |
| return configs; |
| } |
| |
| private UpdateConfigs() {} |
| } |