/*
* The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
* (the "License"). You may not use this work except in compliance with the License, which is
* available at www.apache.org/licenses/LICENSE-2.0
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied, as more fully set forth in the License.
*
* See the NOTICE file distributed with this work for information regarding copyright ownership.
*/
package alluxio.underfs.local;
import alluxio.Seekable;
import alluxio.exception.ExceptionMessage;
import java.io.FileInputStream;
import java.io.FilterInputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;
import javax.annotation.concurrent.NotThreadSafe;
/**
* HDFS implementation for {@link alluxio.underfs.UnderFileSystem}.
*/
@NotThreadSafe
public class LocalUnderFileInputStream extends FilterInputStream implements Seekable {
/** The underlying stream to read data from. */
private FileInputStream mStream;
/**
* Creates a new instance of {@link LocalUnderFileInputStream}.
*
* @param stream the wrapped input stream
*/
public LocalUnderFileInputStream(FileInputStream stream) {
super(stream);
mStream = stream;
}
@Override
public void seek(long position) throws IOException {
FileChannel channel = mStream.getChannel();
if (position > channel.size()) {
throw new IOException(ExceptionMessage.FAILED_SEEK.getMessage(position));
}
channel.position(position);
}
}