/*
    *  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.api.ldap.codec.protocol.mina;
  
  
  import java.nio.ByteBuffer;
  
  
  import org.apache.directory.api.ldap.codec.api.LdapApiService;
  import org.apache.directory.api.ldap.codec.api.LdapApiServiceFactory;
  import org.apache.directory.api.ldap.codec.api.LdapEncoder;
  import org.apache.directory.api.ldap.model.constants.Loggers;
  import org.apache.directory.api.ldap.model.message.Message;
  import org.apache.directory.api.util.Strings;
  import org.apache.mina.core.buffer.IoBuffer;
  import org.apache.mina.core.session.IoSession;
  import org.apache.mina.filter.codec.ProtocolEncoder;
  import org.apache.mina.filter.codec.ProtocolEncoderOutput;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * A LDAP message encoder. It is based on api-ldap encoder.
   *
   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
   */
  public class LdapProtocolEncoder implements ProtocolEncoder
  {
      /** logger for reporting errors that might not be handled properly upstream */
      private static final Logger CODEC_LOG = LoggerFactory.getLogger( Loggers.CODEC_LOG.getName() );
  
      /** A speedup for logger */
      private static final boolean IS_DEBUG = CODEC_LOG.isDebugEnabled();
  
      /** The stateful encoder */
      private LdapEncoder encoder;
  
  
      /**
       * Creates a new instance of LdapProtocolEncoder.
       *
       * @param codec The LDAP codec service associated with this encoder.
       */
      public LdapProtocolEncoder()
      {
          this( LdapApiServiceFactory.getSingleton() );
      }
  
      public LdapProtocolEncoder( LdapApiService ldapApiService )
      {
          this.encoder = new LdapEncoder( ldapApiService );
      }
  
  
      /**
       * {@inheritDoc}
       */
      public void encode( IoSession session, Object message, ProtocolEncoderOutput out ) throws Exception
      {
          ByteBuffer buffer = encoder.encodeMessage( ( Message ) message );
  
          IoBuffer ioBuffer = IoBuffer.wrap( buffer );
  
          if ( IS_DEBUG )
          {
              byte[] dumpBuffer = new byte[buffer.limit()];
              buffer.get( dumpBuffer );
              buffer.flip();
              CODEC_LOG.debug( "Encoded message \n " + message + "\n : " + Strings.dumpBytes( dumpBuffer ) );
          }
  
          out.write( ioBuffer );
      }
  
  
      /**
       * {@inheritDoc}
       */
      public void dispose( IoSession session ) throws Exception
      {
          // Nothing to do
     }
 }