001 /* ServerSocketFactory.java -- factory for server sockets.
002 Copyright (C) 2004 Free Software Foundation, Inc.
003
004 This file is part of GNU Classpath.
005
006 GNU Classpath is free software; you can redistribute it and/or modify
007 it under the terms of the GNU General Public License as published by
008 the Free Software Foundation; either version 2, or (at your option)
009 any later version.
010
011 GNU Classpath is distributed in the hope that it will be useful, but
012 WITHOUT ANY WARRANTY; without even the implied warranty of
013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014 General Public License for more details.
015
016 You should have received a copy of the GNU General Public License
017 along with GNU Classpath; see the file COPYING. If not, write to the
018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019 02110-1301 USA.
020
021 Linking this library statically or dynamically with other modules is
022 making a combined work based on this library. Thus, the terms and
023 conditions of the GNU General Public License cover the whole
024 combination.
025
026 As a special exception, the copyright holders of this library give you
027 permission to link this library with independent modules to produce an
028 executable, regardless of the license terms of these independent
029 modules, and to copy and distribute the resulting executable under
030 terms of your choice, provided that you also meet, for each linked
031 independent module, the terms and conditions of the license of that
032 module. An independent module is a module which is not derived from
033 or based on this library. If you modify this library, you may extend
034 this exception to your version of the library, but you are not
035 obligated to do so. If you do not wish to do so, delete this
036 exception statement from your version. */
037
038
039 package javax.net;
040
041 import java.io.IOException;
042
043 import java.net.InetAddress;
044 import java.net.ServerSocket;
045
046 import 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 */
056 public 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 }