/* * 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.callback; /** * <p> Implementations of this interface are passed to a * <code>CallbackHandler</code>, allowing underlying security services * the ability to interact with a calling application to retrieve specific * authentication data such as usernames and passwords, or to display * certain information, such as error and warning messages. * * <p> <code>Callback</code> implementations do not retrieve or * display the information requested by underlying security services. * <code>Callback</code> implementations simply provide the means * to pass such requests to applications, and for applications, * if appropriate, to return requested information back to the * underlying security services. * * @see javax.security.auth.callback.CallbackHandler * @see javax.security.auth.callback.ChoiceCallback * @see javax.security.auth.callback.ConfirmationCallback * @see javax.security.auth.callback.LanguageCallback * @see javax.security.auth.callback.NameCallback * @see javax.security.auth.callback.PasswordCallback * @see javax.security.auth.callback.TextInputCallback * @see javax.security.auth.callback.TextOutputCallback */public interface Callback { }