| /* |
| * 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.file.common.internal; |
| |
| import com.google.android.libraries.mobiledatadownload.file.common.FileChannelConvertible; |
| import com.google.android.libraries.mobiledatadownload.file.common.FileConvertible; |
| import com.google.android.libraries.mobiledatadownload.file.common.Sizable; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.nio.channels.FileChannel; |
| |
| /** A File-based InputStream that implements all optional Backend behaviors. */ |
| public final class BackendInputStream extends ForwardingInputStream |
| implements FileConvertible, FileChannelConvertible, Sizable { |
| private final FileInputStream fileInputStream; |
| private final File file; |
| |
| public static BackendInputStream create(File file) throws FileNotFoundException { |
| return new BackendInputStream(new FileInputStream(file), file); |
| } |
| |
| private BackendInputStream(FileInputStream fileInputStream, File file) { |
| super(fileInputStream); |
| this.fileInputStream = fileInputStream; |
| this.file = file; |
| } |
| |
| @Override |
| public File toFile() { |
| return file; |
| } |
| |
| @Override |
| public FileChannel toFileChannel() { |
| return fileInputStream.getChannel(); |
| } |
| |
| @Override |
| public Long size() throws IOException { |
| return fileInputStream.getChannel().size(); |
| } |
| } |