org.h2.store.fs.FileChannelOutputStream Maven / Gradle / Ivy
/*
* Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0,
* and the EPL 1.0 (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.store.fs;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
/**
* Allows to write to a file channel like an output stream.
*/
public class FileChannelOutputStream extends OutputStream {
private final FileChannel channel;
private final byte[] buffer = { 0 };
/**
* Create a new file object output stream from the file channel.
*
* @param channel the file channel
* @param append true for append mode, false for truncate and overwrite
*/
public FileChannelOutputStream(FileChannel channel, boolean append)
throws IOException {
this.channel = channel;
if (append) {
channel.position(channel.size());
} else {
channel.position(0);
channel.truncate(0);
}
}
@Override
public void write(int b) throws IOException {
buffer[0] = (byte) b;
FileUtils.writeFully(channel, ByteBuffer.wrap(buffer));
}
@Override
public void write(byte[] b) throws IOException {
FileUtils.writeFully(channel, ByteBuffer.wrap(b));
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
FileUtils.writeFully(channel, ByteBuffer.wrap(b, off, len));
}
@Override
public void close() throws IOException {
channel.close();
}
}