/*
* 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
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*/
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 */