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}