| J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1999 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.awt; |
| 27 | |
| 28 | /** |
| 29 | * The AWTSecurityManager class provides the ability to secondarily |
| 30 | * index AppContext objects through SecurityManager extensions. |
| 31 | * As noted in AppContext.java, AppContexts are primarily indexed by |
| 32 | * ThreadGroup. In the case where the ThreadGroup doesn't provide |
| 33 | * enough information to determine AppContext (e.g. system threads), |
| 34 | * if a SecurityManager is installed which derives from |
| 35 | * AWTSecurityManager, the AWTSecurityManager's getAppContext() |
| 36 | * method is called to determine the AppContext. |
| 37 | * |
| 38 | * A typical example of the use of this class is where an applet |
| 39 | * is called by a system thread, yet the system AppContext is |
| 40 | * inappropriate, because applet code is currently executing. |
| 41 | * In this case, the getAppContext() method can walk the call stack |
| 42 | * to determine the applet code being executed and return the applet's |
| 43 | * AppContext object. |
| 44 | * |
| 45 | * @author Fred Ecks |
| 46 | */ |
| 47 | public class AWTSecurityManager extends SecurityManager { |
| 48 | |
| 49 | /** |
| 50 | * Get the AppContext corresponding to the current context. |
| 51 | * The default implementation returns null, but this method |
| 52 | * may be overridden by various SecurityManagers |
| 53 | * (e.g. AppletSecurity) to index AppContext objects by the |
| 54 | * calling context. |
| 55 | * |
| 56 | * @return the AppContext corresponding to the current context. |
| 57 | * @see sun.awt.AppContext |
| 58 | * @see java.lang.SecurityManager |
| 59 | * @since JDK1.2.1 |
| 60 | */ |
| 61 | public AppContext getAppContext() { |
| 62 | return null; // Default implementation returns null |
| 63 | } |
| 64 | |
| 65 | } /* class AWTSecurityManager */ |