Source for java.net.ProxySelector

   1: /* ProxySelector.java -- A proxy selector class
   2:    Copyright (C) 2006  Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: package java.net;
  39: 
  40: import gnu.java.net.DefaultProxySelector;
  41: 
  42: import java.io.IOException;
  43: import java.util.List;
  44: 
  45: /**
  46:  * Class for handling proxies for different connections.
  47:  * 
  48:  * @since 1.5
  49:  */
  50: public abstract class ProxySelector
  51: {
  52:   /**
  53:    * Default proxy selector.
  54:    */
  55:   private static ProxySelector defaultSelector = new DefaultProxySelector();
  56: 
  57:   /**
  58:    * Creates a new <code>ProxySelector</code> object.
  59:    */
  60:   public ProxySelector()
  61:   {
  62:     // Do nothing here.
  63:   }
  64: 
  65:   /**
  66:    * Returns the default proxy selector.
  67:    *
  68:    * @return the default proxy selector
  69:    *
  70:    * @throws SecurityException If a security manager is installed and it
  71:    * denies NetPermission("getProxySelector")
  72:    */
  73:   public static ProxySelector getDefault()
  74:   {
  75:     SecurityManager sm = System.getSecurityManager();
  76: 
  77:     if (sm != null)
  78:       sm.checkPermission(new NetPermission("getProxySelector"));
  79: 
  80:     return defaultSelector;
  81:   }
  82: 
  83:   /**
  84:    * Sets the default proxy selector.
  85:    *
  86:    * @param selector the defualt proxy selector
  87:    *
  88:    * @throws SecurityException If a security manager is installed and it
  89:    * denies NetPermission("setProxySelector")
  90:    */
  91:   public static void setDefault(ProxySelector selector)
  92:   {
  93:     SecurityManager sm = System.getSecurityManager();
  94: 
  95:     if (sm != null)
  96:       sm.checkPermission(new NetPermission("setProxySelector"));
  97: 
  98:     defaultSelector = selector;
  99:   }
 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: }