/*
    *   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
    *
   *     https://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.api.ldap.codec.controls.search.entryChange;
  
  
  import org.apache.directory.api.asn1.DecoderException;
  import org.apache.directory.api.asn1.ber.tlv.BerValue;
  import org.apache.directory.api.asn1.util.Asn1Buffer;
  import org.apache.directory.api.ldap.codec.api.AbstractControlFactory;
  import org.apache.directory.api.ldap.codec.api.ControlFactory;
  import org.apache.directory.api.ldap.codec.api.LdapApiService;
  import org.apache.directory.api.ldap.model.message.Control;
  import org.apache.directory.api.ldap.model.message.controls.EntryChange;
  import org.apache.directory.api.ldap.model.message.controls.EntryChangeImpl;
  
  
  /**
   * A {@link ControlFactory} for {@link EntryChange} controls.
   *
   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
   * @version $Rev$, $Date$
   */
  public class EntryChangeFactory extends AbstractControlFactory<EntryChange>
  {
      /** Default value when no change number is provided */
      public static final int UNDEFINED_CHANGE_NUMBER = -1;
  
      /**
       * Creates a new instance of EntryChangeFactory.
       *
       * @param codec The LDAP codec.
       */
      public EntryChangeFactory( LdapApiService codec )
      {
          super( codec, EntryChange.OID );
      }
  
  
      /**
       * {@inheritDoc}
       */
      @Override
      public EntryChange newControl()
      {
          return new EntryChangeImpl();
      }
  
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void encodeValue( Asn1Buffer buffer, Control control )
      {
          int start = buffer.getPos();
  
          EntryChange entryChange = ( EntryChange ) control;
  
          // The changeNumber
          if ( entryChange.getChangeNumber() != UNDEFINED_CHANGE_NUMBER )
          {
              BerValue.encodeInteger( buffer, entryChange.getChangeNumber() );
          }
  
          // The previous DN if any
          if ( entryChange.getPreviousDn() != null )
          {
              BerValue.encodeOctetString( buffer, entryChange.getPreviousDn().getName() );
          }
  
          // The change type
          BerValue.encodeEnumerated( buffer, entryChange.getChangeType().getValue() );
  
          // The EntryChangeNotification sequence
          BerValue.encodeSequence( buffer, start );
      }
  
  
      /**
       * {@inheritDoc}
       */
      @Override
     public void decodeValue( Control control, byte[] controlBytes ) throws DecoderException
     {
         decodeValue( new EntryChangeContainer( control ), control, controlBytes );
     }
 }