| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.flink.core.fs.local; |
| |
| import org.apache.flink.annotation.Internal; |
| import org.apache.flink.core.fs.FSDataInputStream; |
| |
| import javax.annotation.Nonnull; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.nio.channels.FileChannel; |
| |
| /** |
| * The <code>LocalDataInputStream</code> class is a wrapper class for a data |
| * input stream to the local file system. |
| */ |
| @Internal |
| public class LocalDataInputStream extends FSDataInputStream { |
| |
| /** The file input stream used to read data from.*/ |
| private final FileInputStream fis; |
| private final FileChannel fileChannel; |
| |
| /** |
| * Constructs a new <code>LocalDataInputStream</code> object from a given {@link File} object. |
| * |
| * @param file The File the data stream is read from |
| * |
| * @throws IOException Thrown if the data input stream cannot be created. |
| */ |
| public LocalDataInputStream(File file) throws IOException { |
| this.fis = new FileInputStream(file); |
| this.fileChannel = fis.getChannel(); |
| } |
| |
| @Override |
| public void seek(long desired) throws IOException { |
| if (desired != getPos()) { |
| this.fileChannel.position(desired); |
| } |
| } |
| |
| @Override |
| public long getPos() throws IOException { |
| return this.fileChannel.position(); |
| } |
| |
| @Override |
| public int read() throws IOException { |
| return this.fis.read(); |
| } |
| |
| @Override |
| public int read(@Nonnull byte[] buffer, int offset, int length) throws IOException { |
| return this.fis.read(buffer, offset, length); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| // According to javadoc, this also closes the channel |
| this.fis.close(); |
| } |
| |
| @Override |
| public int available() throws IOException { |
| return this.fis.available(); |
| } |
| |
| @Override |
| public long skip(final long n) throws IOException { |
| return this.fis.skip(n); |
| } |
| } |