001 /* ProxySelector.java -- A proxy selector class 002 Copyright (C) 2006 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 package java.net; 039 040 import gnu.java.net.DefaultProxySelector; 041 042 import java.io.IOException; 043 import java.util.List; 044 045 /** 046 * Class for handling proxies for different connections. 047 * 048 * @since 1.5 049 */ 050 public abstract class ProxySelector 051 { 052 /** 053 * Default proxy selector. 054 */ 055 private static ProxySelector defaultSelector = new DefaultProxySelector(); 056 057 /** 058 * Creates a new <code>ProxySelector</code> object. 059 */ 060 public ProxySelector() 061 { 062 // Do nothing here. 063 } 064 065 /** 066 * Returns the default proxy selector. 067 * 068 * @return the default proxy selector 069 * 070 * @throws SecurityException If a security manager is installed and it 071 * denies NetPermission("getProxySelector") 072 */ 073 public static ProxySelector getDefault() 074 { 075 SecurityManager sm = System.getSecurityManager(); 076 077 if (sm != null) 078 sm.checkPermission(new NetPermission("getProxySelector")); 079 080 return defaultSelector; 081 } 082 083 /** 084 * Sets the default proxy selector. 085 * 086 * @param selector the defualt proxy selector 087 * 088 * @throws SecurityException If a security manager is installed and it 089 * denies NetPermission("setProxySelector") 090 */ 091 public static void setDefault(ProxySelector selector) 092 { 093 SecurityManager sm = System.getSecurityManager(); 094 095 if (sm != null) 096 sm.checkPermission(new NetPermission("setProxySelector")); 097 098 defaultSelector = selector; 099 } 100 101 /** 102 * Signals to the selector that a proxy was no available. 103 * 104 * @throws IllegalArgumentException If one argument is null 105 */ 106 public abstract void connectFailed(URI uri, SocketAddress address, 107 IOException exception); 108 109 /** 110 * Returns the list of proxy settings for a given URI. 111 * 112 * @return list of proxy settings 113 * 114 * @throws IllegalArgumentException If uri is null 115 */ 116 public abstract List<Proxy> select(URI uri); 117 }