001/* Configuration.java 002 Copyright (C) 2004, 2006 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038 039package javax.security.auth.login; 040 041import gnu.javax.security.auth.login.GnuConfiguration; 042 043import java.security.AccessController; 044import java.security.PrivilegedAction; 045import java.security.Security; 046 047import javax.security.auth.AuthPermission; 048 049public abstract class Configuration 050{ 051 // Fields. 052 // ------------------------------------------------------------------------- 053 054 private static Configuration config; 055 056 // Constructors. 057 // ------------------------------------------------------------------------- 058 059 protected Configuration() 060 { 061 } 062 063 // Class methods. 064 // ------------------------------------------------------------------------- 065 066 public static synchronized Configuration getConfiguration() 067 { 068 SecurityManager sm = System.getSecurityManager(); 069 if (sm != null) 070 sm.checkPermission (new AuthPermission ("getLoginConfiguration")); 071 return getConfig(); 072 } 073 074 public static synchronized void setConfiguration (Configuration config) 075 { 076 SecurityManager sm = System.getSecurityManager(); 077 if (sm != null) 078 sm.checkPermission (new AuthPermission ("setLoginConfiguration")); 079 Configuration.config = config; 080 } 081 082 // Abstract methods. 083 // ------------------------------------------------------------------------- 084 085 public abstract AppConfigurationEntry[] getAppConfigurationEntry (String applicationName); 086 087 public abstract void refresh(); 088 089 // Package-private methods. 090 // ------------------------------------------------------------------------- 091 092 /** 093 * Get the current configuration, bypassing security checks. 094 */ 095 static Configuration getConfig() 096 { 097 if (config == null) 098 { 099 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}