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/*
* 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 android.util.Log;
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) {
Log.e("UpdateConfigs", "Can't read/parse config file " + f.getName(), e);
throw new RuntimeException(
"Can't read/parse config file " + f.getName(), e);
}
}
}
return configs;
}
private UpdateConfigs() {}
}
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