/* * 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 * or visit www.oracle.com if you need additional information or have any * questions. */ package javax.security.auth; /** * Objects such as credentials may optionally implement this interface * to provide the capability to destroy its contents. * * @see javax.security.auth.Subject */public interface Destroyable {     /**     * Destroy this <code>Object</code>.     *     * <p> Sensitive information associated with this <code>Object</code>     * is destroyed or cleared.  Subsequent calls to certain methods     * on this <code>Object</code> will result in an     * <code>IllegalStateException</code> being thrown.     *     * <p>     *     * @exception DestroyFailedException if the destroy operation fails. <p>     *     * @exception SecurityException if the caller does not have permission     *          to destroy this <code>Object</code>.     */    void destroy() throws DestroyFailedException;     /**     * Determine if this <code>Object</code> has been destroyed.     *     * <p>     *     * @return true if this <code>Object</code> has been destroyed,     *          false otherwise.     */    boolean isDestroyed();}