libjava/javax/security/auth/callback/Callback.java

   1 /* Callback.java -- marker interface for callback classes
   2    Copyright (C) 2003, Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package javax.security.auth.callback;
  40
  41 /**
  42  * <p>Implementations of this interface are passed to a {@link CallbackHandler},
  43  * allowing underlying security services the ability to interact with a calling
  44  * application to retrieve specific authentication data such as usernames and
  45  * passwords, or to display certain information, such as error and warning
  46  * messages.</p>
  47  *
  48  * <p><code>Callback</code> implementations do not retrieve or display the
  49  * information requested by underlying security services. <code>Callback</code>
  50  * implementations simply provide the means to pass such requests to
  51  * applications, and for applications, if appropriate, to return requested
  52  * information back to the underlying security services.</p>
  53  *
  54  * @see CallbackHandler
  55  * @see ChoiceCallback
  56  * @see ConfirmationCallback
  57  * @see LanguageCallback
  58  * @see NameCallback
  59  * @see PasswordCallback
  60  * @see TextInputCallback
  61  * @see TextOutputCallback
  62  */
  63 public interface Callback {
  64 }