/*
 * The contents of this file are subject to the terms of the Common Development and
 * Distribution License (the License). You may not use this file except in compliance with the
 * License.
 *
 * You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
 * specific language governing permission and limitations under the License.
 *
 * When distributing Covered Software, include this CDDL Header Notice in each file and include
 * the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
 * Header, with the fields enclosed by brackets [] replaced by your own identifying
 * information: "Portions Copyright [year] [name of copyright owner]".
 *
 * Copyright 2008 Sun Microsystems, Inc.
 * Portions Copyright 2014-2016 ForgeRock AS.
 */
package org.opends.server.api;


import java.util.Collection;
import java.util.List;

import org.forgerock.opendj.server.config.server.MatchingRuleCfg;
import org.forgerock.opendj.config.server.ConfigException;
import org.forgerock.opendj.ldap.schema.MatchingRule;
import org.forgerock.i18n.LocalizableMessage;
import org.opends.server.types.InitializationException;

/**
 * This class defines the set of methods and structures that must be
 * implemented by a Directory Server module that implements a matching
 * rule factory.
 *
 * @param  <T>  The type of configuration handled by this matching
 *              rule.
 */
@org.opends.server.types.PublicAPI(
     stability=org.opends.server.types.StabilityLevel.VOLATILE,
     mayInstantiate=false,
     mayExtend=true,
     mayInvoke=false)
public abstract class MatchingRuleFactory<T extends MatchingRuleCfg>
{

  /**
   * Initializes the matching rule(s) based on the information in the
   * provided configuration entry.
   *
   * @param  configuration  The configuration to use to intialize this
   *                        matching rule.
   *
   * @throws  ConfigException  If an unrecoverable problem arises in
   *                           the process of performing the
   *                           initialization.
   *
   * @throws  InitializationException  If a problem that is not
   *                                   configuration-related occurs
   *                                   during initialization.
   */
  public abstract void initializeMatchingRule(T configuration)
         throws ConfigException, InitializationException;



  /**
   * Performs any finalization that may be needed whenever this
   * matching rule factory is taken out of service.
   */
  public  void finalizeMatchingRule()
  {
    //No implementation is required by default.
  }



  /**
   * Indicates whether the provided configuration is acceptable for
   * this matching rule.  It should be possible to call this method on
   * an uninitialized matching rule instance in order to determine
   * whether the matching rule 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 matching rule 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 matching rule, or {@code false} if not.
   */
  public  boolean isConfigurationAcceptable(
                      T configuration,
                      List<LocalizableMessage> unacceptableReasons)
  {
    // This default implementation does not perform any special
    // validation.  It should be overridden by matching rule
    // implementations that wish to perform more detailed validation.
    return true;
  }



  /**
   * Returns an umodifiable view of Collection of associated
   * MatchingRules.
   *
   * @return  An unmodifiable view of Collection of
   *          MatchingRule instances.
   */
  public abstract Collection<MatchingRule> getMatchingRules();
}