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/* SocketTransport.java -- a socket transport

   Copyright (C) 2005, 2007 Free Software Foundation

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., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 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

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.classpath.jdwp.transport;

import gnu.classpath.jdwp.transport.ITransport;

import gnu.classpath.jdwp.transport.TransportException;

import java.io.InputStream;

import java.io.IOException;

import java.io.OutputStream;

import java.net.ServerSocket;

import java.net.Socket;

import java.util.HashMap;

import javax.net.ServerSocketFactory;

import javax.net.SocketFactory;

/**

 * A socket-based transport. This transport uses

 * configury string that looks like "name=dt_socket,

 * address=localhost:1234,server=y".

 *

 * @author Keith Seitz (keiths@redhat.com)

 */

class SocketTransport

  implements ITransport

{

  /**

   * Name of this transport

   */

  public static final String NAME = "dt_socket";

  // Configure properties

  private static final String _PROPERTY_ADDRESS = "address";

  private static final String _PROPERTY_SERVER = "server";

  // Port number

  private int _port;

  // Host name

  private String _host;

  // Are we acting as a server?

  private boolean _server = false;

  // Socket

  private Socket _socket;

  /**

   * Setup the connection configuration from the given properties

   *

   * @param  properties  the properties of the JDWP session

   * @throws TransportException for any configury errors

   */

  public void configure(HashMap properties)

    throws TransportException

  {

    // Get server [form: "y" or "n"]

    String p = (String) properties.get(_PROPERTY_SERVER);

    if (p != null)

      {

        if (p.toLowerCase().equals("y"))

          _server = true;

      }

    // Get address [form: "hostname:port"]

    p = (String) properties.get(_PROPERTY_ADDRESS);

    if (p != null)

      {

        String[] s = p.split(":");

        if (s.length == 1)

          {

            // Port number only. Assume "localhost"

            _port = Integer.parseInt(s[0]);

            _host = "localhost";

          }

        else

          {

            if (s[0].length() == 0)

              _host = "localhost";

            else

              _host = s[0];

            _port = Integer.parseInt(s[1]);

          }

      }

  }

  /**

   * Initialize this socket connection. This includes

   * connecting to the host (or listening for it).

   *

   * @throws TransportException if a transport-related error occurs

   */

  public void initialize ()

    throws TransportException

  {

    try

      {

        if (_server)

          {

            // Get a server socket

            ServerSocketFactory ssf = ServerSocketFactory.getDefault ();

            ServerSocket ss = ssf.createServerSocket (_port, 1);

            _socket = ss.accept ();

          }

        else

          {

            // Get a client socket (the factory will connect it)

            SocketFactory sf = SocketFactory.getDefault ();

            _socket = sf.createSocket (_host, _port);

          }

      }

    catch (IOException ioe)

      {

        // This will grab UnknownHostException, too.

        throw new TransportException (ioe);

      }

  }

  /**

   * Shutdown the socket. This could cause SocketExceptions

   * for anyone blocked on socket i/o

   */

  public void shutdown ()

  {

    try

      {

        _socket.close ();

      }

    catch (Throwable t)

      {

        // We don't really care about errors at this point

      }

  }

  /**

   * Returns an <code>InputStream</code> for the transport

   *

   * @throws IOException if an I/O error occurs creating the stream

   *                     or the socket is not connected

   */

  public InputStream getInputStream ()

    throws IOException

  {

    return _socket.getInputStream ();

  }

  /**

   * Returns an <code>OutputStream</code> for the transport

   *

   * @throws IOException if an I/O error occurs creating the stream

   *                     or the socket is not connected

   */

  public OutputStream getOutputStream ()

    throws IOException

  {

    return _socket.getOutputStream ();

  }

}