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/**
*
* Copyright (C) 2000-2003 Enterprise Distributed Technologies Ltd
*
* www.enterprisedt.com
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Bug fixes, suggestions and comments should be should posted on
* http://www.enterprisedt.com/forums/index.php
*
* Change Log:
*
* $Log: FTPActiveDataSocket.java,v $
* Revision 1.5 2005/06/03 11:26:25 bruceb
* comment change
*
* Revision 1.4 2004/07/23 08:27:03 bruceb
* made public cvsId
*
* Revision 1.3 2003/11/15 11:23:55 bruceb
* changes required for ssl subclasses
*
* Revision 1.1 2003/11/02 21:49:52 bruceb
* implement FTPDataSocket interface
*
*
*/
package com.enterprisedt.net.ftp;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
/**
* Active data socket handling class
*
* @author Bruce Blackshaw
* @version $Revision: 1.5 $
*/
public class FTPActiveDataSocket implements FTPDataSocket {
/**
* Revision control id
*/
public static String cvsId = "@(#)$Id: FTPActiveDataSocket.java,v 1.5 2005/06/03 11:26:25 bruceb Exp $";
/**
* The underlying socket for Active connection.
*/
protected ServerSocket sock = null;
/**
* The socket accepted from server.
*/
protected Socket acceptedSock = null;
/**
* Constructor
*
* @param sock the server socket to use
*/
protected FTPActiveDataSocket(ServerSocket sock) {
this.sock = sock;
}
/**
* Set the TCP timeout on the underlying data socket(s).
*
* If a timeout is set, then any operation which
* takes longer than the timeout value will be
* killed with a java.io.InterruptedException.
*
* @param millis The length of the timeout, in milliseconds
*/
public void setTimeout(int millis) throws IOException {
sock.setSoTimeout(millis);
if (acceptedSock != null)
acceptedSock.setSoTimeout(millis);
}
/**
* Returns the local port to which this socket is bound.
*
* @return the local port number to which this socket is bound
*/
public int getLocalPort() {
return sock.getLocalPort();
}
/**
* Waits for a connection from the server and then sets the timeout
* when the connection is made.
* @throws IOException There was an error while waiting for or accepting
* a connection from the server.
*/
protected void acceptConnection() throws IOException {
if (acceptedSock==null) {
acceptedSock = sock.accept();
acceptedSock.setSoTimeout(sock.getSoTimeout());
}
}
/**
* If active mode, accepts the FTP server's connection - in PASV,
* we are already connected. Then gets the output stream of
* the connection
*
* @return output stream for underlying socket.
*/
public OutputStream getOutputStream() throws IOException {
// accept socket from server
acceptConnection();
return acceptedSock.getOutputStream ();
}
/**
* If active mode, accepts the FTP server's connection - in PASV,
* we are already connected. Then gets the input stream of
* the connection
*
* @return input stream for underlying socket.
*/
public InputStream getInputStream() throws IOException {
// accept socket from server
acceptConnection();
return acceptedSock.getInputStream();
}
/**
* Closes underlying sockets
*/
public void close() throws IOException {
if (acceptedSock != null) {
acceptedSock.close();
acceptedSock = null;
}
sock.close();
}
}