/*
    *   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.ldap.replication;
  
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.ObjectInputStream;
  import java.io.ObjectOutput;
  import java.io.ObjectOutputStream;
  
  import jdbm.helper.Serializer;
  
  import org.apache.directory.api.ldap.model.entry.DefaultEntry;
  import org.apache.directory.api.ldap.model.entry.Entry;
  import org.apache.directory.api.ldap.model.message.controls.ChangeType;
  import org.apache.directory.api.ldap.model.name.Dn;
  import org.apache.directory.api.ldap.model.schema.SchemaManager;
  
  
  /**
   * A ReplicaEventMessage serializer/deserializer.
   * 
   * A modification is serialized following this format : <br>
   * <ul>
   * <li>byte : EventType</li>
   * <li>byte[] : the serialized DN</li>
   * <li>byte[] : the serialized entry</li>
   * </ul>
   * 
   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
   */
  public class ReplicaEventMessageSerializer implements Serializer
  {
      /** The serialVersionUID */
      private static final long serialVersionUID = 1L;
  
      /** The schemaManager */
      private transient SchemaManager schemaManager;
  
  
      /**
       * Creates a new instance of ReplicaEventMessageSerializer.
       *
       * @param schemaManager The reference to the global schemaManager
       */
      public ReplicaEventMessageSerializer( SchemaManager schemaManager )
      {
          this.schemaManager = schemaManager;
      }
  
  
      /**
       * {@inheritDoc}
       */
      public byte[] serialize( Object object ) throws IOException
      {
          ReplicaEventMessagee/directory/server/ldap/replication/ReplicaEventMessage.html#ReplicaEventMessage">ReplicaEventMessage replicaEventMessage = ( ReplicaEventMessage ) object;
  
          Entry entry = replicaEventMessage.getEntry();
          ChangeType changeType = replicaEventMessage.getChangeType();
  
          try ( ByteArrayOutputStream baos = new ByteArrayOutputStream();
              ObjectOutput out = new ObjectOutputStream( baos ) )
          {
  
              // The change type first
              out.writeByte( changeType.getValue() );
  
              // The entry DN
              entry.getDn().writeExternal( out );
  
              // The entry
              entry.writeExternal( out );
  
              out.flush();
  
              return baos.toByteArray();
          }
      }
  
 
     /**
      *  Deserialize a ReplicaEventMessage.
      *  
      *  @param bytes the byte array containing the serialized ReplicaEventMessage
      *  @return An instance of a ReplicaEventMessage object 
      *  @throws IOException if we can't deserialize the ReplicaEventMessage
      */
     public Object deserialize( byte[] bytes ) throws IOException
     {
         ObjectInputStream in = new ObjectInputStream( new ByteArrayInputStream( bytes ) );
 
         ReplicaEventMessage replicaEventMessage = null;
 
         try
         {
             // The changeType
             byte type = in.readByte();
             ChangeType changeType = ChangeType.getChangeType( type );
 
             // The Entry's DN
             Dn entryDn = new Dn( schemaManager );
             entryDn.readExternal( in );
 
             // The Entry
             Entry entry = new DefaultEntry( schemaManager );
             entry.readExternal( in );
             entry.setDn( entryDn );
 
             // And create a ReplicaEventMessage
             replicaEventMessage = new ReplicaEventMessage( changeType, entry );
         }
         catch ( ClassNotFoundException cnfe )
         {
             // there is nothing we can do here...
         }
 
         return replicaEventMessage;
     }
 }