001 /* Callback.java -- marker interface for callback classes
002 Copyright (C) 2003, Free Software Foundation, Inc.
003
004 This file is part of GNU Classpath.
005
006 GNU Classpath is free software; you can redistribute it and/or modify
007 it under the terms of the GNU General Public License as published by
008 the Free Software Foundation; either version 2, or (at your option)
009 any later version.
010
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014 General Public License for more details.
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019 02110-1301 USA.
020
021 Linking this library statically or dynamically with other modules is
022 making a combined work based on this library. Thus, the terms and
023 conditions of the GNU General Public License cover the whole
024 combination.
025
026 As a special exception, the copyright holders of this library give you
027 permission to link this library with independent modules to produce an
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029 modules, and to copy and distribute the resulting executable under
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033 or based on this library. If you modify this library, you may extend
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035 obligated to do so. If you do not wish to do so, delete this
036 exception statement from your version. */
037
038
039 package javax.security.auth.callback;
040
041 /**
042 * <p>Implementations of this interface are passed to a {@link CallbackHandler},
043 * allowing underlying security services the ability to interact with a calling
044 * application to retrieve specific authentication data such as usernames and
045 * passwords, or to display certain information, such as error and warning
046 * messages.</p>
047 *
048 * <p><code>Callback</code> implementations do not retrieve or display the
049 * information requested by underlying security services. <code>Callback</code>
050 * implementations simply provide the means to pass such requests to
051 * applications, and for applications, if appropriate, to return requested
052 * information back to the underlying security services.</p>
053 *
054 * @see CallbackHandler
055 * @see ChoiceCallback
056 * @see ConfirmationCallback
057 * @see LanguageCallback
058 * @see NameCallback
059 * @see PasswordCallback
060 * @see TextInputCallback
061 * @see TextOutputCallback
062 */
063 public interface Callback {
064 }