/* IAuthInfoProvider.java -- 
   Copyright (C) 2003, 2006 Free Software Foundation, Inc.

This file is a part of GNU Classpath.

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it under the terms of the GNU General Public License as published by
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General Public License for more details.

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package gnu.javax.crypto.sasl;

import java.util.Map;

import javax.security.sasl.AuthenticationException;

/**
 * The visible methods of any authentication information provider.
 */
public interface IAuthInfoProvider
{
  /**
   * Activates (initialises) this provider instance. SHOULD be the first method
   * invoked on the provider.
   * 
   * @param context a collection of name-value bindings describing the
   *          activation context.
   * @throws AuthenticationException if an exception occurs during the
   *           operation.
   */
  void activate(Map context) throws AuthenticationException;

  /**
   * Passivates (releases) this provider instance. SHOULD be the last method
   * invoked on the provider. Once it is done, no other method may be invoked on
   * the same instance before it is <i>activated</i> agains.
   * 
   * @throws AuthenticationException if an exception occurs during the
   *           operation.
   */
  void passivate() throws AuthenticationException;

  /**
   * Checks if a user with a designated name is known to this provider.
   * 
   * @param userName the name of a user to check.
   * @return <code>true</code> if the user with the designated name is known
   *         to this provider; <code>false</code> otherwise.
   * @throws AuthenticationException if an exception occurs during the
   *           operation.
   */
  boolean contains(String userName) throws AuthenticationException;

  /**
   * Returns a collection of information about a designated user. The contents
   * of the returned map is provider-specific of name-to-value mappings.
   * 
   * @param userID a map of name-to-value bindings that fully describe a user.
   * @return a collection of information about the designated user.
   * @throws AuthenticationException if an exception occurs during the
   *           operation.
   */
  Map lookup(Map userID) throws AuthenticationException;

  /**
   * Updates the credentials of a designated user.
   * 
   * @param userCredentials a map of name-to-value bindings that fully describe
   *          a user, including per new credentials.
   * @throws AuthenticationException if an exception occurs during the
   *           operation.
   */
  void update(Map userCredentials) throws AuthenticationException;

  /**
   * A provider may operate in more than mode; e.g. SRP-II caters for user
   * credentials computed in more than one message digest algorithm. This method
   * returns the set of name-to-value bindings describing the mode of the
   * provider.
   * 
   * @param mode a unique identifier describing the operational mode.
   * @return a collection of name-to-value bindings describing the designated
   *         mode.
   * @throws AuthenticationException if an exception occurs during the
   *           operation.
   */
  Map getConfiguration(String mode) throws AuthenticationException;
}