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/*
* $Id: PassiveModeDTP.java,v 1.5 2004/07/30 19:06:45 dog Exp $
* Copyright (C) 2003 The Free Software Foundation
*
* This file is part of GNU inetlib, a library.
*
* GNU inetlib is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GNU inetlib 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* As a special exception, if you link this library with other files to
* produce an executable, this library does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* This exception does not however invalidate any other reasons why the
* executable file might be covered by the GNU General Public License.
*/
package gnu.inet.ftp;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
/**
* A passive mode FTP data transfer process.
* This connects to the host specified and proxies the resulting socket's
* input and output streams.
*
* @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
* @version $Revision: 1.5 $ $Date: 2004/07/30 19:06:45 $
*/
final class PassiveModeDTP implements DTP
{
final String address;
final int port;
Socket socket;
DTPInputStream in;
DTPOutputStream out;
boolean completed;
boolean inProgress;
int transferMode;
PassiveModeDTP (String address, int port, InetAddress localhost,
int connectionTimeout, int timeout)
throws IOException
{
this.address = address;
this.port = port;
completed = false;
inProgress = false;
socket = new Socket ();
InetSocketAddress remote = new InetSocketAddress (address, port);
InetSocketAddress local = new InetSocketAddress (localhost, port + 1);
socket.bind (local);
if (connectionTimeout > 0)
{
socket.connect (remote, connectionTimeout);
}
else
{
socket.connect (remote);
}
if (timeout > 0)
{
socket.setSoTimeout (timeout);
}
}
/**
* Returns an input stream from which a remote file can be read.
*/
public InputStream getInputStream () throws IOException
{
if (inProgress)
{
throw new IOException ("Transfer in progress");
}
switch (transferMode)
{
case FTPConnection.MODE_STREAM:
in = new StreamInputStream (this, socket.getInputStream ());
break;
case FTPConnection.MODE_BLOCK:
in = new BlockInputStream (this, socket.getInputStream ());
break;
case FTPConnection.MODE_COMPRESSED:
in = new CompressedInputStream (this, socket.getInputStream ());
break;
default:
throw new IllegalStateException ("Invalid transfer mode");
}
in.setTransferComplete (false);
return in;
}
/**
* Returns an output stream to which a local file can be written for
* upload.
*/
public OutputStream getOutputStream () throws IOException
{
if (inProgress)
{
throw new IOException ("Transfer in progress");
}
switch (transferMode)
{
case FTPConnection.MODE_STREAM:
out = new StreamOutputStream (this, socket.getOutputStream ());
break;
case FTPConnection.MODE_BLOCK:
out = new BlockOutputStream (this, socket.getOutputStream ());
break;
case FTPConnection.MODE_COMPRESSED:
out = new CompressedOutputStream (this, socket.getOutputStream ());
break;
default:
throw new IllegalStateException("Invalid transfer mode");
}
out.setTransferComplete (false);
return out;
}
public void setTransferMode (int mode)
{
transferMode = mode;
}
public void complete ()
{
completed = true;
if (!inProgress)
{
transferComplete ();
}
}
public boolean abort ()
{
completed = true;
transferComplete ();
return inProgress;
}
/*
* Called by DTPInputStream or DTPOutputStream when end of
* stream is reached.
*/
public void transferComplete ()
{
if (in != null)
{
in.setTransferComplete (true);
}
if (out != null)
{
out.setTransferComplete (true);
}
inProgress = false;
completed = completed || (transferMode == FTPConnection.MODE_STREAM);
if (completed && socket != null)
{
try
{
socket.close ();
}
catch (IOException e)
{
}
}
}
}
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