/*
* $Id$
*
* Copyright (C) 2003-2014 JNode.org
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.fs.nfs.nfs2;
import java.io.IOException;
import java.nio.ByteBuffer;
import org.jnode.fs.FSFile;
import org.jnode.net.nfs.nfs2.NFS2Client;
import org.jnode.net.nfs.nfs2.NFS2Exception;
import org.jnode.net.nfs.nfs2.ReadFileResult;
import org.jnode.net.nfs.nfs2.Time;
/**
* A NFS2File model a NFS file .
*
* @author Andrei Dore
*/
public class NFS2File extends NFS2Object implements FSFile {
private NFS2Entry entry;
NFS2File(NFS2Entry entry) {
super((NFS2FileSystem) entry.getFileSystem());
this.entry = entry;
}
/**
* Gets the length (in bytes) of this file
*
* @return long
*/
public long getLength() {
return entry.getFileAttribute().getSize();
}
/**
* Read <code>len</code> bytes from the given position. The read data is
* read fom this file starting at offset <code>fileOffset</code> and
* stored in <code>dest</code> starting at offset <code>ofs</code>.
*
* @param fileOffset
* @param dest
* @throws java.io.IOException
*/
public void read(long fileOffset, ByteBuffer dest) throws IOException {
NFS2Client client = getNFS2Client();
try {
int length;
while (true) {
length = Math.min(NFS2Client.MAX_DATA, dest.remaining());
if (length == 0) {
return;
}
ReadFileResult result =
client.readFile(entry.getFileHandle(), (int) fileOffset, length);
byte[] data = result.getData();
length = data.length;
fileOffset += length;
dest.put(data);
}
} catch (NFS2Exception e) {
throw new IOException("Error reading file. Reason:" + e.getMessage(), e);
}
}
/**
* Flush any cached data to the disk.
*
* @throws java.io.IOException
*/
public void flush() throws IOException {
}
/**
* Sets the length of this file.
*
* @param length
* @throws java.io.IOException
*/
public void setLength(long length) throws IOException {
NFS2Client client = getNFS2Client();
try {
client.setAttribute(entry.getFileHandle(), -1, -1, -1, (int) length, new Time(-1, -1),
new Time(-1, -1));
} catch (NFS2Exception e) {
throw new IOException(e.getMessage(), e);
}
}
/**
* Write <code>len</code> bytes to the given position. The data is read
* from <code>src</code> starting at offset <code>ofs</code> and written
* to this file starting at offset <code>fileOffset</code>.
*
* @param fileOffset
* @param src
* @throws java.io.IOException
*/
public void write(long fileOffset, ByteBuffer src) throws IOException {
NFS2Client client = getNFS2Client();
try {
byte[] data = new byte[NFS2Client.MAX_DATA];
int count;
while (src.remaining() > 0) {
count = Math.min(NFS2Client.MAX_DATA, src.remaining());
src.get(data, 0, count);
client.writeFile(entry.getFileHandle(), (int) fileOffset, data, 0, count);
fileOffset += count;
}
} catch (NFS2Exception e) {
throw new IOException("Error writing file . Reason: " + e.getMessage(), e);
}
}
}