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/*
* Copyright (c) 1997, 2013, 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 java.security;
/**
* <p> This interface represents a guard, which is an object that is used
* to protect access to another object.
*
* <p>This interface contains a single method, {@code checkGuard},
* with a single {@code object} argument. {@code checkGuard} is
* invoked (by the GuardedObject {@code getObject} method)
* to determine whether or not to allow access to the object.
*
* @see GuardedObject
*
* @author Roland Schemers
* @author Li Gong
*/
public interface Guard {
/**
* Determines whether or not to allow access to the guarded object
* {@code object}. Returns silently if access is allowed.
* Otherwise, throws a SecurityException.
*
* @param object the object being protected by the guard.
*
* @exception SecurityException if access is denied.
*
*/
void checkGuard(Object object) throws SecurityException;
}
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