| /* |
| * Copyright (c) 1999, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.awt; |
| |
| /** |
| * The AWTSecurityManager class provides the ability to secondarily |
| * index AppContext objects through SecurityManager extensions. |
| * As noted in AppContext.java, AppContexts are primarily indexed by |
| * ThreadGroup. In the case where the ThreadGroup doesn't provide |
| * enough information to determine AppContext (e.g. system threads), |
| * if a SecurityManager is installed which derives from |
| * AWTSecurityManager, the AWTSecurityManager's getAppContext() |
| * method is called to determine the AppContext. |
| * |
| * A typical example of the use of this class is where an applet |
| * is called by a system thread, yet the system AppContext is |
| * inappropriate, because applet code is currently executing. |
| * In this case, the getAppContext() method can walk the call stack |
| * to determine the applet code being executed and return the applet's |
| * AppContext object. |
| * |
| * @author Fred Ecks |
| */ |
| public class AWTSecurityManager extends SecurityManager { |
| |
| /** |
| * Get the AppContext corresponding to the current context. |
| * The default implementation returns null, but this method |
| * may be overridden by various SecurityManagers |
| * (e.g. AppletSecurity) to index AppContext objects by the |
| * calling context. |
| * |
| * @return the AppContext corresponding to the current context. |
| * @see sun.awt.AppContext |
| * @see java.lang.SecurityManager |
| * @since JDK1.2.1 |
| */ |
| public AppContext getAppContext() { |
| return null; // Default implementation returns null |
| } |
| |
| } /* class AWTSecurityManager */ |