libjava/gnu/java/net/protocol/ftp/PassiveModeDTP.java

   1 /* PassiveModeDTP.java --
   2    Copyright (C) 2003, 2004  Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package gnu.java.net.protocol.ftp;
  40
  41 import java.io.InputStream;
  42 import java.io.IOException;
  43 import java.io.OutputStream;
  44 import java.net.InetAddress;
  45 import java.net.InetSocketAddress;
  46 import java.net.Socket;
  47
  48 /**
  49  * A passive mode FTP data transfer process.
  50  * This connects to the host specified and proxies the resulting socket's
  51  * input and output streams.
  52  *
  53  * @author Chris Burdess (dog@gnu.org)
  54  */
  55 final class PassiveModeDTP
  56   implements DTP
  57 {
  58
  59   final String address;
  60   final int port;
  61   Socket socket;
  62   DTPInputStream in;
  63   DTPOutputStream out;
  64   boolean completed;
  65   boolean inProgress;
  66   int transferMode;
  67
  68   PassiveModeDTP(String address, int port, InetAddress localhost,
  69                  int connectionTimeout, int timeout)
  70     throws IOException
  71   {
  72     this.address = address;
  73     this.port = port;
  74     completed = false;
  75     inProgress = false;
  76     socket = new Socket();
  77     InetSocketAddress remote = new InetSocketAddress(address, port);
  78     InetSocketAddress local = new InetSocketAddress(localhost, port + 1);
  79     socket.bind(local);
  80     if (connectionTimeout > 0)
  81       {
  82         socket.connect(remote, connectionTimeout);
  83       }
  84     else
  85       {
  86         socket.connect(remote);
  87       }
  88     if (timeout > 0)
  89       {
  90         socket.setSoTimeout(timeout);
  91       }
  92   }
  93
  94   /**
  95    * Returns an input stream from which a remote file can be read.
  96    */
  97   public InputStream getInputStream()
  98     throws IOException
  99   {
 100     if (inProgress)
 101       {
 102         throw new IOException("Transfer in progress");
 103       }
 104     switch (transferMode)
 105       {
 106       case FTPConnection.MODE_STREAM:
 107         in = new StreamInputStream(this, socket.getInputStream());
 108         break;
 109       case FTPConnection.MODE_BLOCK:
 110         in = new BlockInputStream(this, socket.getInputStream());
 111         break;
 112       case FTPConnection.MODE_COMPRESSED:
 113         in = new CompressedInputStream(this, socket.getInputStream());
 114         break;
 115       default:
 116         throw new IllegalStateException("Invalid transfer mode");
 117       }
 118     in.setTransferComplete(false);
 119     return in;
 120   }
 121
 122   /**
 123    * Returns an output stream to which a local file can be written for
 124    * upload.
 125    */
 126   public OutputStream getOutputStream()
 127     throws IOException
 128   {
 129     if (inProgress)
 130       {
 131         throw new IOException("Transfer in progress");
 132       }
 133     switch (transferMode)
 134       {
 135       case FTPConnection.MODE_STREAM:
 136         out = new StreamOutputStream(this, socket.getOutputStream());
 137         break;
 138       case FTPConnection.MODE_BLOCK:
 139         out = new BlockOutputStream(this, socket.getOutputStream());
 140         break;
 141       case FTPConnection.MODE_COMPRESSED:
 142         out = new CompressedOutputStream(this, socket.getOutputStream());
 143         break;
 144       default:
 145         throw new IllegalStateException("Invalid transfer mode");
 146       }
 147     out.setTransferComplete(false);
 148     return out;
 149   }
 150
 151   public void setTransferMode(int mode)
 152   {
 153     transferMode = mode;
 154   }
 155
 156   public void complete()
 157   {
 158     completed = true;
 159     if (!inProgress)
 160       {
 161         transferComplete();
 162       }
 163   }
 164
 165   public boolean abort()
 166   {
 167     completed = true;
 168     transferComplete();
 169     return inProgress;
 170   }
 171
 172   /*
 173    * Called by DTPInputStream or DTPOutputStream when end of
 174    * stream is reached.
 175    */
 176   public void transferComplete()
 177   {
 178     if (in != null)
 179       {
 180         in.setTransferComplete(true);
 181       }
 182     if (out != null)
 183       {
 184         out.setTransferComplete(true);
 185       }
 186     inProgress = false;
 187     completed = completed ||(transferMode == FTPConnection.MODE_STREAM);
 188     if (completed && socket != null)
 189       {
 190         try
 191           {
 192             socket.close();
 193           }
 194         catch (IOException e)
 195           {
 196           }
 197       }
 198   }
 199
 200 }
 201