/*

 * Copyright 1997-1998 Sun Microsystems, Inc.  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.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.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</code>,

 * with a single <code>object</code> argument. <code>checkGuard</code> is

 * invoked (by the GuardedObject <code>getObject</code> 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</code>. 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;

}