| /* |
| * Copyright (C) 2017 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 libcore.timezone; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Utility methods associated with finding updateable time zone data files. |
| * |
| * @hide |
| */ |
| @libcore.api.CorePlatformApi |
| public final class TimeZoneDataFiles { |
| private static final String ANDROID_ROOT_ENV = "ANDROID_ROOT"; |
| private static final String ANDROID_RUNTIME_ROOT_ENV = "ANDROID_RUNTIME_ROOT"; |
| private static final String ANDROID_DATA_ENV = "ANDROID_DATA"; |
| |
| private TimeZoneDataFiles() {} |
| |
| /** |
| * Returns time zone file paths for the specified file name in an array in the order they |
| * should be tried. See {@link #generateIcuDataPath()} for ICU files instead. |
| * <ul> |
| * <li>[0] - the location of the file in the /data partition (may not exist).</li> |
| * <li>[1] - the location of the file from the time zone module under /apex (may not exist). |
| * </li> |
| * <li>[2] - the location of the file from the runtime module under /apex (should exist).</li> |
| * </ul> |
| * <li>[3] - the location of the file in the /system partition (should exist).</li> |
| */ |
| // VisibleForTesting |
| public static String[] getTimeZoneFilePaths(String fileName) { |
| return new String[] { |
| getDataTimeZoneFile(fileName), |
| getTimeZoneModuleFile("tz/" + fileName), |
| getRuntimeModuleFile("tz/" + fileName), |
| getSystemTimeZoneFile(fileName) |
| }; |
| } |
| |
| // Remove from CorePlatformApi when all users in platform code are removed. http://b/123398797 |
| @libcore.api.CorePlatformApi |
| public static String getDataTimeZoneRootDir() { |
| return System.getenv(ANDROID_DATA_ENV) + "/misc/zoneinfo/"; |
| } |
| |
| @libcore.api.CorePlatformApi |
| public static String getDataTimeZoneFile(String fileName) { |
| return getDataTimeZoneRootDir() + "current/" + fileName; |
| } |
| |
| public static String getTimeZoneModuleFile(String fileName) { |
| return "/apex/com.android.tzdata/etc/" + fileName; |
| } |
| |
| // Remove from CorePlatformApi when all users in platform code are removed. http://b/123398797 |
| @libcore.api.CorePlatformApi |
| public static String getRuntimeModuleTzVersionFile() { |
| return getRuntimeModuleFile("tz/" + TzDataSetVersion.DEFAULT_FILE_NAME); |
| } |
| |
| public static String getRuntimeModuleFile(String fileName) { |
| return System.getenv(ANDROID_RUNTIME_ROOT_ENV) + "/etc/" + fileName; |
| } |
| |
| public static String getSystemTimeZoneFile(String fileName) { |
| return getEnvironmentPath(ANDROID_ROOT_ENV, "/usr/share/zoneinfo/" + fileName); |
| } |
| |
| public static String getSystemIcuFile(String fileName) { |
| return getEnvironmentPath(ANDROID_ROOT_ENV, "/usr/icu/" + fileName); |
| } |
| |
| public static String generateIcuDataPath() { |
| List<String> paths = new ArrayList<>(3); |
| |
| // ICU should first look in ANDROID_DATA. This is used for (optional) time zone data |
| // delivered by APK (https://source.android.com/devices/tech/config/timezone-rules) |
| String dataIcuDataPath = |
| getEnvironmentPath(ANDROID_DATA_ENV, "/misc/zoneinfo/current/icu/"); |
| if (dataIcuDataPath != null) { |
| paths.add(dataIcuDataPath); |
| } |
| |
| // ICU should then look for a mounted time zone module file in /apex. This is used for |
| // (optional) time zone data that can be updated with an APEX file. |
| String timeZoneModuleIcuDataPath = getTimeZoneModuleFile("icu/"); |
| if (timeZoneModuleIcuDataPath != null) { |
| paths.add(timeZoneModuleIcuDataPath); |
| } |
| |
| // ICU should always look in the runtime module path as this is where most of the data |
| // can be found. |
| String runtimeModuleIcuDataPath = getRuntimeModuleFile("icu/"); |
| if (runtimeModuleIcuDataPath != null) { |
| paths.add(runtimeModuleIcuDataPath); |
| } |
| return String.join(":", paths); |
| } |
| |
| /** |
| * Creates a path by combining the value of an environment variable with a relative path. |
| * Returns {@code null} if the environment variable is not set. |
| */ |
| private static String getEnvironmentPath(String environmentVariable, String path) { |
| String variable = System.getenv(environmentVariable); |
| if (variable == null) { |
| return null; |
| } |
| return variable + path; |
| } |
| } |