/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at
 * trunk/opends/resource/legal-notices/OpenDS.LICENSE
 * or https://OpenDS.dev.java.net/OpenDS.LICENSE.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at
 * trunk/opends/resource/legal-notices/OpenDS.LICENSE.  If applicable,
 * add the following below this CDDL HEADER, with the fields enclosed
 * by brackets "[]" replaced with your own identifying information:
 *      Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 *
 *
 *      Copyright 2006-2008 Sun Microsystems, Inc.
 */
package org.opends.server.api;
import org.opends.messages.Message;



import java.util.List;
import javax.net.ssl.TrustManager;

import org.opends.server.admin.std.server.TrustManagerProviderCfg;
import org.opends.server.config.ConfigException;
import org.opends.server.types.DirectoryException;
import org.opends.server.types.InitializationException;



/**
 * This class defines an API that may be used to obtain a set of
 * {@code javax.net.ssl.TrustManager} objects for use when performing
 * SSL/StartTLS negotiation.
 *
 * @param  <T>  The type of trust manager provider configuration
 *              handled by this trust manager provider implementation.
 */
@org.opends.server.types.PublicAPI(
     stability=org.opends.server.types.StabilityLevel.VOLATILE,
     mayInstantiate=false,
     mayExtend=true,
     mayInvoke=true)
public abstract class TrustManagerProvider<T extends
        TrustManagerProviderCfg>
{
  /**
   * Initializes this trust manager provider based on the information
   * in the provided configuration entry.
   *
   * @param  configuration  The configuration to use for this trust
   *                        manager provider.
   *
   * @throws  ConfigException  If an unrecoverable problem arises in
   *                           the process of performing the
   *                           initialization as a result of the
   *                           server configuration.
   *
   * @throws  InitializationException  If a problem occurs during
   *                                   initialization that is not
   *                                   related to the server
   *                                   configuration.
   */
  public abstract void initializeTrustManagerProvider(
                            T configuration)
         throws ConfigException, InitializationException;



  /**
   * Indicates whether the provided configuration is acceptable for
   * this trust manager provider.  It should be possible to call this
   * method on an uninitialized trust manager provider instance in
   * order to determine whether the trust manager provider would be
   * able to use the provided configuration.
   * <BR><BR>
   * Note that implementations which use a subclass of the provided
   * configuration class will likely need to cast the configuration
   * to the appropriate subclass type.
   *
   * @param  configuration        The trust manager provider
   *                              configuration for which to make the
   *                              determination.
   * @param  unacceptableReasons  A list that may be used to hold the
   *                              reasons that the provided
   *                              configuration is not acceptable.
   *
   * @return  {@code true} if the provided configuration is acceptable
   *          for this trust manager provider, or {@code false} if
   *          not.
   */
  public boolean isConfigurationAcceptable(
                      TrustManagerProviderCfg configuration,
                      List<Message> unacceptableReasons)
  {
    // This default implementation does not perform any special
    // validation.  It should be overridden by trust manager provider
    // implementations that wish to perform more detailed validation.
    return true;
  }



  /**
   * Performs any finalization that may be necessary for this trust
   * manager provider.
   */
  public abstract void finalizeTrustManagerProvider();



  /**
   * Retrieves a set of {@code TrustManager} objects that may be used
   * for interactions requiring access to a trust manager.
   *
   * @return  A set of {@code TrustManager} objects that may be used
   *          for interactions requiring access to a trust manager.
   *
   * @throws  DirectoryException  If a problem occurs while attempting
   *                              to obtain the set of trust managers.
   */
  public abstract TrustManager[] getTrustManagers()
         throws DirectoryException;
}