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    1   /*
    2    * Copyright (c) 1999, 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</code>, 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</code> implementations do not retrieve or
   37    * display the information requested by underlying security services.
   38    * <code>Callback</code> 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 { }

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