/* * Copyright 2022 Google LLC * * 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.google.android.libraries.mobiledatadownload.internal.downloader; import android.net.Uri; /** Delta file name utility class. */ public class FileNameUtil { public static final String NAME_SEPARATOR = "_"; /** * For cases that the downloaded file is different than the final file, generate a temporary file * for download and name it with a suffix of the downloaded file checksum to avoid naming * conflicts. */ public static String getTempFileNameWithDownloadedFileChecksum(String fileName, String checksum) { return fileName + NAME_SEPARATOR + checksum; } /** Get the final file name by removing the temporary downloaded file suffix as "_checksum". */ public static Uri getFinalFileUriWithTempDownloadedFile(Uri downloadedFileUri) { String serializedDeltaFileUri = downloadedFileUri.toString(); return Uri.parse( serializedDeltaFileUri.substring(0, serializedDeltaFileUri.lastIndexOf(NAME_SEPARATOR))); } }