1/*
2 * Copyright (c) 1999, 2013, 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
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23 * questions.
24 */
25
26
27package javax.security.auth.callback;
28
29/**
30 * <p> Implementations of this interface are passed to a
31 * {@code CallbackHandler}, allowing underlying security services
32 * the ability to interact with a calling application to retrieve specific
33 * authentication data such as usernames and passwords, or to display
34 * certain information, such as error and warning messages.
35 *
36 * <p> {@code Callback} implementations do not retrieve or
37 * display the information requested by underlying security services.
38 * {@code Callback} implementations simply provide the means
39 * to pass such requests to applications, and for applications,
40 * if appropriate, to return requested information back to the
41 * underlying security services.
42 *
43 * @since 1.4
44 * @see javax.security.auth.callback.CallbackHandler
45 * @see javax.security.auth.callback.ChoiceCallback
46 * @see javax.security.auth.callback.ConfirmationCallback
47 * @see javax.security.auth.callback.LanguageCallback
48 * @see javax.security.auth.callback.NameCallback
49 * @see javax.security.auth.callback.PasswordCallback
50 * @see javax.security.auth.callback.TextInputCallback
51 * @see javax.security.auth.callback.TextOutputCallback
52 */
53public interface Callback { }
54