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 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 27 package 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 * @see javax.security.auth.callback.CallbackHandler 44 * @see javax.security.auth.callback.ChoiceCallback 45 * @see javax.security.auth.callback.ConfirmationCallback 46 * @see javax.security.auth.callback.LanguageCallback 47 * @see javax.security.auth.callback.NameCallback 48 * @see javax.security.auth.callback.PasswordCallback 49 * @see javax.security.auth.callback.TextInputCallback 50 * @see javax.security.auth.callback.TextOutputCallback 51 */ 52 public interface Callback { } 53
