/*

 * 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 */