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/*
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* Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package javax.security.auth.callback;
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/**
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* <p> Implementations of this interface are passed to a
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* {@code CallbackHandler}, allowing underlying security services
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* the ability to interact with a calling application to retrieve specific
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* authentication data such as usernames and passwords, or to display
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* certain information, such as error and warning messages.
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*
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* <p> {@code Callback} implementations do not retrieve or
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* display the information requested by underlying security services.
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* {@code Callback} implementations simply provide the means
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* to pass such requests to applications, and for applications,
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* if appropriate, to return requested information back to the
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* underlying security services.
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*
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* @see javax.security.auth.callback.CallbackHandler
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* @see javax.security.auth.callback.ChoiceCallback
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* @see javax.security.auth.callback.ConfirmationCallback
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* @see javax.security.auth.callback.LanguageCallback
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* @see javax.security.auth.callback.NameCallback
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* @see javax.security.auth.callback.PasswordCallback
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* @see javax.security.auth.callback.TextInputCallback
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* @see javax.security.auth.callback.TextOutputCallback
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*/
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public interface Callback { }
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