| /* |
| * 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 com.android.i18n.timezone; |
| |
| import android.icu.platform.AndroidDataFiles; |
| |
| import java.io.File; |
| import java.io.IOException; |
| |
| /** |
| * Utility methods associated with finding updateable time zone data files. ICU4C and ICU4J also |
| * read files affected by time zone updates. That logic is kept in {@link AndroidDataFiles} |
| * and should be updated if file locations or lookup order changes. |
| * |
| * @hide |
| */ |
| @libcore.api.CorePlatformApi |
| public final class TimeZoneDataFiles { |
| private static final String ANDROID_ROOT_ENV = AndroidDataFiles.ANDROID_ROOT_ENV; |
| private static final String ANDROID_TZDATA_ROOT_ENV = AndroidDataFiles.ANDROID_TZDATA_ROOT_ENV; |
| |
| private TimeZoneDataFiles() {} |
| |
| /** |
| * Returns time zone file paths for the specified file name in an array in the order they |
| * should be tried. See {@link AndroidDataFiles#generateIcuDataPath()} for ICU files instead. |
| * <ul> |
| * <li>[0] - the location of the file from the time zone module under /apex (must exist).</li> |
| * </ul> |
| */ |
| // VisibleForTesting |
| public static String[] getTimeZoneFilePaths(String fileName) { |
| return new String[] { getTimeZoneModuleTzFile(fileName) }; |
| } |
| |
| public static String getTimeZoneModuleTzFile(String fileName) { |
| return getTimeZoneModuleFile("tz/" + fileName); |
| } |
| |
| // Remove from CorePlatformApi when all users in platform code are removed. http://b/123398797 |
| @libcore.api.CorePlatformApi |
| public static String getTimeZoneModuleTzVersionFile() { |
| return getTimeZoneModuleTzFile(TzDataSetVersion.DEFAULT_FILE_NAME); |
| } |
| |
| /** |
| * Reads the version of time zone data supplied by the time zone data module. |
| */ |
| @libcore.api.CorePlatformApi |
| public static TzDataSetVersion readTimeZoneModuleVersion() |
| throws IOException, TzDataSetVersion.TzDataSetException { |
| String tzVersionFileName = getTimeZoneModuleTzFile(TzDataSetVersion.DEFAULT_FILE_NAME); |
| return TzDataSetVersion.readFromFile(new File(tzVersionFileName)); |
| } |
| |
| // VisibleForTesting |
| public static String getTimeZoneModuleFile(String fileName) { |
| return System.getenv(ANDROID_TZDATA_ROOT_ENV) + "/etc/" + fileName; |
| } |
| |
| public static String getSystemTzFile(String fileName) { |
| return getEnvironmentPath(ANDROID_ROOT_ENV, "/usr/share/zoneinfo/" + fileName); |
| } |
| |
| // VisibleForTesting |
| public static String getSystemIcuFile(String fileName) { |
| return getEnvironmentPath(ANDROID_ROOT_ENV, "/usr/icu/" + fileName); |
| } |
| |
| /** |
| * 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; |
| } |
| } |