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 }