96 lines
3.5 KiB
Java
96 lines
3.5 KiB
Java
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.i18n.timezone;
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import android.icu.platform.AndroidDataFiles;
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import java.io.File;
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import java.io.IOException;
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/**
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* Utility methods associated with finding updateable time zone data files. ICU4C and ICU4J also
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* read files affected by time zone updates. That logic is kept in {@link AndroidDataFiles}
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* and should be updated if file locations or lookup order changes.
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*
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* @hide
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*/
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@libcore.api.CorePlatformApi
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public final class TimeZoneDataFiles {
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private static final String ANDROID_ROOT_ENV = AndroidDataFiles.ANDROID_ROOT_ENV;
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private static final String ANDROID_TZDATA_ROOT_ENV = AndroidDataFiles.ANDROID_TZDATA_ROOT_ENV;
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private TimeZoneDataFiles() {}
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/**
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* Returns time zone file paths for the specified file name in an array in the order they
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* should be tried. See {@link AndroidDataFiles#generateIcuDataPath()} for ICU files instead.
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* <ul>
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* <li>[0] - the location of the file from the time zone module under /apex (must exist).</li>
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* </ul>
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*/
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// VisibleForTesting
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public static String[] getTimeZoneFilePaths(String fileName) {
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return new String[] { getTimeZoneModuleTzFile(fileName) };
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}
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public static String getTimeZoneModuleTzFile(String fileName) {
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return getTimeZoneModuleFile("tz/" + fileName);
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}
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// Remove from CorePlatformApi when all users in platform code are removed. http://b/123398797
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@libcore.api.CorePlatformApi
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public static String getTimeZoneModuleTzVersionFile() {
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return getTimeZoneModuleTzFile(TzDataSetVersion.DEFAULT_FILE_NAME);
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}
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/**
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* Reads the version of time zone data supplied by the time zone data module.
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*/
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@libcore.api.CorePlatformApi
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public static TzDataSetVersion readTimeZoneModuleVersion()
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throws IOException, TzDataSetVersion.TzDataSetException {
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String tzVersionFileName = getTimeZoneModuleTzFile(TzDataSetVersion.DEFAULT_FILE_NAME);
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return TzDataSetVersion.readFromFile(new File(tzVersionFileName));
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}
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// VisibleForTesting
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public static String getTimeZoneModuleFile(String fileName) {
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return System.getenv(ANDROID_TZDATA_ROOT_ENV) + "/etc/" + fileName;
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}
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public static String getSystemTzFile(String fileName) {
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return getEnvironmentPath(ANDROID_ROOT_ENV, "/usr/share/zoneinfo/" + fileName);
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}
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// VisibleForTesting
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public static String getSystemIcuFile(String fileName) {
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return getEnvironmentPath(ANDROID_ROOT_ENV, "/usr/icu/" + fileName);
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}
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/**
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* Creates a path by combining the value of an environment variable with a relative path.
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* Returns {@code null} if the environment variable is not set.
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*/
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private static String getEnvironmentPath(String environmentVariable, String path) {
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String variable = System.getenv(environmentVariable);
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if (variable == null) {
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return null;
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}
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return variable + path;
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}
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}
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