socketchannelimpl.java

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/* SocketChannelImpl.java -- 
   Copyright (C) 2002 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath 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, or (at your option)
any later version.

GNU Classpath 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 GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so.  If you do not wish to do so, delete this
exception statement from your version. */

package gnu.java.nio;

import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.AlreadyConnectedException;
import java.nio.channels.SocketChannel;
import java.nio.channels.spi.SelectorProvider;
import gnu.classpath.Configuration;

public class SocketChannelImpl extends SocketChannel
{
  Socket sock_object;
  int fd;
  int local_port;
  boolean blocking = true;
  boolean connected = false;
  InetSocketAddress sa;

  static native int SocketCreate();
  static native int SocketConnect(int fd, InetAddress addr, int port);
  static native int SocketBind(int fd, InetAddress addr, int port);
  static native int SocketListen(int fd, int backlog);
  static native int SocketAvailable(int fd);
  static native int SocketClose(int fd);
  static native int SocketRead(int fd, byte b[], int off, int len);
  static native int SocketWrite(int fd, byte b[], int off, int len);

  public SocketChannelImpl(SelectorProvider provider)		      
  {
    super(provider);
    fd = SocketCreate();
	
    if (fd == -1)
	    {
        System.err.println("failed to create socket:"+fd);
	    }
  }

  public void finalizer()
  {
    if (connected)
	    {
        try
          {
            close();
          }
        catch (Exception e)
          {
          }
	    }
  }

  protected void implCloseSelectableChannel()
  {
    connected = false;
    SocketClose(fd);
    fd = SocketCreate();
  }

  protected void implConfigureBlocking(boolean  block)
  {
    if (blocking == block)
	    return;
  }   

  public boolean connect(SocketAddress remote)
    throws IOException
  {
    if (connected)
	    {
        throw new AlreadyConnectedException();
	    }

    // ok, lets connect !
	
    sa = (InetSocketAddress) remote;
	
    InetAddress addr = sa.getAddress();
    int port = sa.getPort();
    int err = SocketConnect(fd, addr, port);
	
    if (err < 0) 
	    {
        throw new IOException("Connection refused:"+err + ", connect="+err);
	    }

    local_port = err;
    connected = true;
    return blocking;
  }
    
  public boolean finishConnect()
  {
    return false;
  }

  public boolean isConnected()
  {
    return connected;
  }
    
  public boolean isConnectionPending()
  {
    if (blocking)
	    return true;

    return false;
  }
    
  public Socket socket()
  {
    if (sock_object != null)
	    {
        //sock_object.ch = this;
	    }

    return sock_object;
  }

  public int read(ByteBuffer dst)
  {
    int bytes = 0;
    int len = 1024;
    byte[]b = new byte[len];
	
    bytes = SocketRead(fd, b, 0, len);
    dst.put(b, 0, bytes);

    if (bytes == 0)
	    {
        // we've hit eof ?
        return -1;
	    }

    return bytes;
  }
    
  public long read(ByteBuffer[] dsts, int offset, int length)
  {
    long bytes = 0;

    for (int i=offset; i<length; i++)
	    {
        bytes += read(dsts[i]);
	    }

    return bytes;
  }
     
  public int write(ByteBuffer src)
  {
    int bytes = 0;
    int len = src.position();

    if (src instanceof ByteBufferImpl)
	    {
        ByteBufferImpl bi = (ByteBufferImpl) src;
        byte[]b = bi.array();
        bytes = SocketWrite(fd, b, 0, len);
	    }
    else
	    {
        byte[]b = new byte[len];
        src.get(b, 0, len);
        bytes = SocketWrite(fd, b, 0, len);
	    }
		
	  return bytes;
  }

  public long write (ByteBuffer[] srcs, int offset, int length)
  {
    long bytes = 0;

    for (int i=offset; i<length; i++)
	    {
        bytes += write(srcs[i]);
	    }

    return bytes;
  }
}