Source for javax.security.auth.login.Configuration

   1: /* Configuration.java
   2:    Copyright (C) 2004, 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: 
  39: package javax.security.auth.login;
  40: 
  41: import gnu.javax.security.auth.login.GnuConfiguration;
  42: 
  43: import java.security.AccessController;
  44: import java.security.PrivilegedAction;
  45: import java.security.Security;
  46: 
  47: import javax.security.auth.AuthPermission;
  48: 
  49: public abstract class Configuration
  50: {
  51:   // Fields.
  52:   // -------------------------------------------------------------------------
  53: 
  54:   private static Configuration config;
  55: 
  56:   // Constructors.
  57:   // -------------------------------------------------------------------------
  58: 
  59:   protected Configuration()
  60:   {
  61:   }
  62: 
  63:   // Class methods.
  64:   // -------------------------------------------------------------------------
  65: 
  66:   public static synchronized Configuration getConfiguration()
  67:   {
  68:     SecurityManager sm = System.getSecurityManager();
  69:     if (sm != null)
  70:       sm.checkPermission (new AuthPermission ("getLoginConfiguration"));
  71:     return getConfig();
  72:   }
  73: 
  74:   public static synchronized void setConfiguration (Configuration config)
  75:   {
  76:     SecurityManager sm = System.getSecurityManager();
  77:     if (sm != null)
  78:       sm.checkPermission (new AuthPermission ("setLoginConfiguration"));
  79:     Configuration.config = config;
  80:   }
  81: 
  82:   // Abstract methods.
  83:   // -------------------------------------------------------------------------
  84: 
  85:   public abstract AppConfigurationEntry[] getAppConfigurationEntry (String applicationName);
  86: 
  87:   public abstract void refresh();
  88: 
  89:   // Package-private methods.
  90:   // -------------------------------------------------------------------------
  91: 
  92:   /**
  93:    * Get the current configuration, bypassing security checks.
  94:    */
  95:   static Configuration getConfig()
  96:   {
  97:     if (config == null)
  98:       {
  99:         String conf = (String) AccessController.doPrivileged
 100:           (new PrivilegedAction()
 101:             {
 102:               public Object run()
 103:               {
 104:                 return Security.getProperty ("login.configuration.provider");
 105:               }
 106:             });
 107:         try
 108:           {
 109:             if (conf != null)
 110:               config = (Configuration) Class.forName (conf).newInstance();
 111:             else
 112:               config = new GnuConfiguration();
 113:           }
 114:         catch (Exception x)
 115:           {
 116:             config = new GnuConfiguration();
 117:           }
 118:       }
 119:     return config;
 120:   }
 121: }