/*
    *   Licensed to the Apache Software Foundation (ASF) under one
    *   or more contributor license agreements.  See the NOTICE file
    *   distributed with this work for additional information
    *   regarding copyright ownership.  The ASF licenses this file
    *   to you under the Apache License, Version 2.0 (the
    *   "License"); you may not use this file except in compliance
    *   with the License.  You may obtain a copy of the License at
    *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   *   Unless required by applicable law or agreed to in writing,
   *   software distributed under the License is distributed on an
   *   "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   *   KIND, either express or implied.  See the License for the
   *   specific language governing permissions and limitations
   *   under the License.
   *
   */
  
  package org.apache.directory.server.core.partition.impl.btree.jdbm;
  
  
  import java.io.File;
  import java.io.IOException;
  
  import jdbm.RecordManager;
  
  import org.apache.directory.api.ldap.model.exception.LdapException;
  import org.apache.directory.api.ldap.model.name.Dn;
  import org.apache.directory.api.ldap.model.schema.AttributeType;
  import org.apache.directory.api.ldap.model.schema.MatchingRule;
  import org.apache.directory.api.ldap.model.schema.SchemaManager;
  import org.apache.directory.api.ldap.model.schema.comparators.UuidComparator;
  import org.apache.directory.server.i18n.I18n;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * A special index which stores DN objects.
   * 
   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
   */
  public class JdbmDnIndex extends JdbmIndex<Dn>
  {
  
      /** A logger for this class */
      private static final Logger LOG = LoggerFactory.getLogger( JdbmDnIndex.class );
  
  
      public JdbmDnIndex( String oid )
      {
          super( oid, true );
          initialized = false;
      }
  
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void init( RecordManager recMan, SchemaManager schemaManager, AttributeType attributeType ) throws LdapException, IOException
      {
          LOG.debug( "Initializing an Index for attribute '{}'", attributeType.getName() );
  
          this.attributeType = attributeType;
  
          if ( attributeId == null )
          {
              setAttributeId( attributeType.getName() );
          }
  
          if ( this.wkDirPath == null )
          {
              throw new NullPointerException( "The index working directory has not be set" );
          }
  
          String path = new File( this.wkDirPath, attributeType.getOid() ).getAbsolutePath();
  
          this.recMan = recMan;
  
          try
          {
              initTables( schemaManager );
          }
          catch ( IOException e )
          {
              // clean up
              close( null );
              throw e;
          }
  
          initialized = true;
      }
  
  
      /**
       * Initializes the forward and reverse tables used by this Index.
      * 
      * @param schemaManager The server schemaManager
      * @throws IOException if we cannot initialize the forward and reverse
      * tables
      * @throws NamingException
      */
     private void initTables( SchemaManager schemaManager ) throws IOException
     {
         MatchingRule mr = attributeType.getEquality();
 
         if ( mr == null )
         {
             throw new IOException( I18n.err( I18n.ERR_574, attributeType.getName() ) );
         }
 
         DnSerializerComparator/core/partition/impl/btree/jdbm/DnSerializerComparator.html#DnSerializerComparator">DnSerializerComparator comp = new DnSerializerComparator( mr.getOid() );
 
         UuidComparator.INSTANCE.setSchemaManager( schemaManager );
 
         DnSerializerer/core/partition/impl/btree/jdbm/DnSerializer.html#DnSerializer">DnSerializer dnSerializer = new DnSerializer( schemaManager );
 
         forward = new JdbmTable<Dn, String>( schemaManager, attributeType.getOid() + FORWARD_BTREE,
             recMan, comp, dnSerializer, UuidSerializer.INSTANCE );
         reverse = new JdbmTable<String, Dn>( schemaManager, attributeType.getOid() + REVERSE_BTREE,
             recMan, UuidComparator.INSTANCE, UuidSerializer.INSTANCE, dnSerializer );
     }
 }