001 /* SocketFactory.java -- factory for client 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.Socket; 045 import java.net.UnknownHostException; 046 047 import java.security.Security; 048 049 /** 050 * A factory for client sockets. The purpose of this class is to serve 051 * as the superclass of server socket factories that produce client 052 * sockets of a particular type, such as <i>Secure Socket Layer</i> 053 * (<b>SSL</b>) sockets. 054 * 055 * @author Casey Marshall (rsdio@metastatic.org) 056 */ 057 public abstract class SocketFactory 058 { 059 060 // Constructor. 061 // ------------------------------------------------------------------- 062 063 /** 064 * Default 0-arguments constructor. 065 */ 066 protected SocketFactory() 067 { 068 super(); 069 } 070 071 // Class methods. 072 // ------------------------------------------------------------------- 073 074 /** 075 * Returns the default socket factory. The type of factory 076 * returned may depend upon the installation. 077 * 078 * @return The default socket factory. 079 */ 080 public static synchronized SocketFactory getDefault() 081 { 082 try 083 { 084 String s = Security.getProperty("gnu.defaultSocketFactory"); 085 if (s != null) 086 { 087 Class c = Class.forName(s); 088 return (SocketFactory) c.newInstance(); 089 } 090 } 091 catch (Exception e) 092 { 093 } 094 return new VanillaSocketFactory(); 095 } 096 097 // Instance methods. 098 // ------------------------------------------------------------------- 099 100 /** 101 * Returns an unbound client socket. 102 * 103 * @return The new, unbound socket. 104 */ 105 public Socket createSocket() throws IOException 106 { 107 throw new UnsupportedOperationException(); 108 } 109 110 /** 111 * Creates a socket connected to a given host on a given port. 112 * 113 * @param host The hostname to connect to. 114 * @param port The port on <i>host</i> to connect to. 115 * @return A socket connected to <i>host</i> on <i>port</i>. 116 * @throws IOException If a network error occurs. 117 * @throws UnknownHostException If <i>host</i> cannot be resolved. 118 */ 119 public abstract Socket createSocket(String host, int port) throws IOException, UnknownHostException; 120 121 /** 122 * Creates a socket connected to a given host on a given port, 123 * connecting locally to the interface with the given address and port. 124 * 125 * @param host The hostname to connect to. 126 * @param port The port on <i>host</i> to connect to. 127 * @param localHost The address of the local interface to bind to. 128 * @param localPort The local port to bind to. 129 * @return A socket connected to <i>host</i> on <i>port</i>. 130 * @throws IOException If a network error occurs. 131 * @throws UnknownHostException If <i>host</i> cannot be resolved. 132 */ 133 public abstract Socket createSocket(String host, int port, InetAddress localHost, int localPort) throws IOException, UnknownHostException; 134 135 /** 136 * Creates a socket connected to a given host on a given port. 137 * 138 * @param host The host address to connect to. 139 * @param port The port on <i>host</i> to connect to. 140 * @return A socket connected to <i>host</i> on <i>port</i>. 141 * @throws IOException If a network error occurs. 142 */ 143 public abstract Socket createSocket(InetAddress host, int port) throws IOException; 144 145 /** 146 * Creates a socket connected to a given host on a given port, 147 * connecting locally to the interface with the given address and port. 148 * 149 * @param host The host address to connect to. 150 * @param port The port on <i>host</i> to connect to. 151 * @param localHost The address of the local interface to bind to. 152 * @param localPort The local port to bind to. 153 * @return A socket connected to <i>host</i> on <i>port</i>. 154 * @throws IOException If a network error occurs. 155 */ 156 public abstract Socket createSocket(InetAddress hast, int port, InetAddress localHost, int localPort) throws IOException; 157 }