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