001/* ServerSocketFactory.java -- factory for server sockets.
002   Copyright (C) 2004 Free Software Foundation, Inc.
003
004This file is part of GNU Classpath.
005
006GNU Classpath is free software; you can redistribute it and/or modify
007it under the terms of the GNU General Public License as published by
008the Free Software Foundation; either version 2, or (at your option)
009any later version.
010
011GNU Classpath is distributed in the hope that it will be useful, but
012WITHOUT ANY WARRANTY; without even the implied warranty of
013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014General Public License for more details.
015
016You should have received a copy of the GNU General Public License
017along with GNU Classpath; see the file COPYING.  If not, write to the
018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
01902110-1301 USA.
020
021Linking this library statically or dynamically with other modules is
022making a combined work based on this library.  Thus, the terms and
023conditions of the GNU General Public License cover the whole
024combination.
025
026As a special exception, the copyright holders of this library give you
027permission to link this library with independent modules to produce an
028executable, regardless of the license terms of these independent
029modules, and to copy and distribute the resulting executable under
030terms of your choice, provided that you also meet, for each linked
031independent module, the terms and conditions of the license of that
032module.  An independent module is a module which is not derived from
033or based on this library.  If you modify this library, you may extend
034this exception to your version of the library, but you are not
035obligated to do so.  If you do not wish to do so, delete this
036exception statement from your version. */
037
038
039package javax.net;
040
041import java.io.IOException;
042
043import java.net.InetAddress;
044import java.net.ServerSocket;
045
046import java.security.Security;
047
048/**
049 * A factory for server sockets. The purpose of this class is to serve
050 * as the superclass of server socket factories that produce server
051 * sockets of a particular type, such as <i>Secure Socket Layer</i>
052 * (<b>SSL</b>) server sockets.
053 *
054 * @author Casey Marshall (rsdio@metastatic.org)
055 */
056public abstract class ServerSocketFactory
057{
058
059  // Constructors.
060  // ------------------------------------------------------------------------
061
062  /**
063   * Default 0-argument constructor.
064   */
065  protected ServerSocketFactory()
066  {
067    super();
068  }
069
070  // Class methods.
071  // ------------------------------------------------------------------------
072
073  /**
074   * Returns the default server socket factory. The type of factory
075   * returned may depend upon the installation.
076   *
077   * @return The default server socket factory.
078   */
079  public static synchronized ServerSocketFactory getDefault()
080  {
081    try
082      {
083        String s = Security.getProperty("gnu.defaultServerSocketFactory");
084        if (s != null)
085          {
086            Class c = Class.forName(s);
087            return (ServerSocketFactory) c.newInstance();
088          }
089      }
090    catch (Exception e)
091      {
092      }
093    return new VanillaServerSocketFactory();
094  }
095
096  // Instance methods.
097  // ------------------------------------------------------------------------
098
099  /**
100   * Create an unbound server socket.
101   *
102   * @return The new server socket.
103   * @throws IOException If a networking error occurs.
104   */
105  public ServerSocket createServerSocket() throws IOException
106  {
107    throw new UnsupportedOperationException();
108  }
109
110  /**
111   * Create a server socket bound to the given port.
112   *
113   * @param port The port to bind the server socket to.
114   * @return A server socket bound to <i>port</i>.
115   * @throws IOException If a networking error occurs.
116   */
117  public abstract ServerSocket createServerSocket(int port) throws IOException;
118
119  public abstract ServerSocket createServerSocket(int port, int backlog) throws IOException;
120
121  public abstract ServerSocket createServerSocket(int port, int backlog, InetAddress bindAddress) throws IOException;
122}