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    1   /*
    2    * Copyright (c) 1997, 1998, Oracle and/or its affiliates. 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.  Oracle designates this
    8    * particular file as subject to the "Classpath" exception as provided
    9    * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   22    * or visit www.oracle.com if you need additional information or have any
   23    * questions.
   24    */
   25   
   26   package java.security;
   27   
   28   /**
   29    * <p> This interface represents a guard, which is an object that is used
   30    * to protect access to another object.
   31    *
   32    * <p>This interface contains a single method, <code>checkGuard</code>,
   33    * with a single <code>object</code> argument. <code>checkGuard</code> is
   34    * invoked (by the GuardedObject <code>getObject</code> method)
   35    * to determine whether or not to allow access to the object.
   36    *
   37    * @see GuardedObject
   38    *
   39    * @author Roland Schemers
   40    * @author Li Gong
   41    */
   42   
   43   public interface Guard {
   44   
   45       /**
   46        * Determines whether or not to allow access to the guarded object
   47        * <code>object</code>. Returns silently if access is allowed.
   48        * Otherwise, throws a SecurityException.
   49        *
   50        * @param object the object being protected by the guard.
   51        *
   52        * @exception SecurityException if access is denied.
   53        *
   54        */
   55       void checkGuard(Object object) throws SecurityException;
   56   }

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