/*
 * $Id: FTPURLConnection.java,v 1.4 2004/06/08 19:05:27 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.FileNotFoundException;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;

/**
 * An FTP URL connection.
 *
 * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
 * @version $Revision: 1.4 $ $Date: 2004/06/08 19:05:27 $
 */
public class FTPURLConnection extends URLConnection
{

  /**
   * The connection managing the protocol exchange.
   */
  protected FTPConnection connection;

  /**
   * Constructs an FTP connection to the specified URL.
   * @param url the URL
   */
  public FTPURLConnection (URL url)
    {
      super (url);
    }

  /**
   * Establishes the connection.
   */
  public void connect () throws IOException
    {
      if (connected)
        {
          return;
        }
      String host = url.getHost ();
      int port = url.getPort ();
      String username = url.getUserInfo ();
      String password = null;
      if (username != null)
        {
          int ci = username.indexOf (':');
          if (ci != -1)
            {
              password = username.substring (ci + 1);
              username = username.substring (0, ci);
            }
        }
      connection = new FTPConnection (host, port);
      if (username != null && !connection.authenticate (username, password))
        {
          throw new SecurityException ("Authentication failed");
        }
    }

  /**
   * This connection supports doInput.
   */
  public void setDoInput (boolean doinput)
    {
      doInput = doinput;
    }

  /**
   * This connection supports doOutput.
   */
  public void setDoOutput (boolean dooutput)
    {
      doOutput = dooutput;
    }

  /**
   * Returns an input stream that reads from this open connection.
   */
  public InputStream getInputStream () throws IOException
    {
      String dir = url.getPath ();
      String filename = url.getFile ();
      connection.setRepresentationType (FTPConnection.TYPE_BINARY);
      connection.setPassive (true);
      if (!connection.changeWorkingDirectory (dir))
        {
          throw new FileNotFoundException (dir);
        }
      if (filename != null)
        {
          return connection.retrieve (filename);
        }
      else
        {
          return connection.list (null);
        }
      // TODO provide a means to close the connection
    }

  /**
   * Returns an output stream that writes to this connection.
   */
  public OutputStream getOutputStream () throws IOException
    {
      String dir = url.getPath ();
      String filename = url.getFile ();
      connection.setRepresentationType (FTPConnection.TYPE_BINARY);
      connection.setPassive (true);
      if (!connection.changeWorkingDirectory (dir))
        {
          throw new FileNotFoundException (dir);
        }
      if (filename != null)
        {
          return connection.store (filename);
        }
      else
        {
          throw new FileNotFoundException (filename);
        }
      // TODO provide a means to close the connection
    }

  // TODO allow user to configure the FTPConnection using setRequestProperty

}
