/*
    *   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.extras.extended.ads_impl.whoAmI;
  
  
  import java.nio.ByteBuffer;
  
  import org.apache.directory.api.asn1.DecoderException;
  import org.apache.directory.api.asn1.EncoderException;
  import org.apache.directory.api.asn1.ber.tlv.BerValue;
  import org.apache.directory.api.asn1.ber.tlv.TLV;
  import org.apache.directory.api.i18n.I18n;
  import org.apache.directory.api.ldap.codec.api.ExtendedResponseDecorator;
  import org.apache.directory.api.ldap.codec.api.LdapApiService;
  import org.apache.directory.api.ldap.extras.extended.whoAmI.WhoAmIResponse;
  import org.apache.directory.api.ldap.extras.extended.whoAmI.WhoAmIResponseImpl;
  import org.apache.directory.api.ldap.model.name.Dn;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * A Decorator for WhoAmIResponse extended request.
   *
   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
   */
  public class WhoAmIResponseDecorator extends ExtendedResponseDecorator<WhoAmIResponse>
      implements WhoAmIResponse
  {
      private static final Logger LOG = LoggerFactory.getLogger( WhoAmIResponseDecorator.class );
  
      private WhoAmIResponse whoAmIResponse;
  
  
      /**
       * Creates a new instance of WhoAmIResponseDecorator.
       *
       * @param codec The LDAP service instance
       * @param decoratedMessage The decorated message
       */
      public WhoAmIResponseDecorator( LdapApiService codec, WhoAmIResponse decoratedMessage )
      {
          super( codec, decoratedMessage );
          whoAmIResponse = decoratedMessage;
      }
  
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void setResponseValue( byte[] responseValue )
      {
          WhoAmIResponseDecoder decoder = new WhoAmIResponseDecoder();
  
          try
          {
              if ( responseValue != null )
              {
                  whoAmIResponse = decoder.decode( responseValue );
  
                  this.responseValue = new byte[responseValue.length];
                  System.arraycopy( responseValue, 0, this.responseValue, 0, responseValue.length );
              }
          }
          catch ( DecoderException e )
          {
              LOG.error( I18n.err( I18n.ERR_04165 ), e );
              throw new RuntimeException( e );
          }
      }
  
  
      /**
       * {@inheritDoc}
       */
      @Override
      public byte[] getResponseValue()
      {
          if ( responseValue == null )
          {
              try
             {
                 responseValue = encodeInternal().array();
             }
             catch ( EncoderException e )
             {
                 LOG.error( I18n.err( I18n.ERR_04167 ), e );
                 throw new RuntimeException( e );
             }
         }
 
         return responseValue;
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public byte[] getAuthzId()
     {
         return getDecorated().getAuthzId();
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public void setAuthzId( byte[] authzId )
     {
         ( ( WhoAmIResponseImpl ) getDecorated() ).setAuthzId( authzId );
     }
 
 
     /**
      * Set the userId
      */
     /* no qualifier*/void setUserId( String userId )
     {
         ( ( WhoAmIResponseImpl ) whoAmIResponse ).setUserId( userId );
     }
 
 
     /**
      * Set the DnId
      */
     /* no qualifier*/void setDn( Dn dn )
     {
         ( ( WhoAmIResponseImpl ) whoAmIResponse ).setDn( dn );
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public boolean isDnAuthzId()
     {
         return whoAmIResponse.isDnAuthzId();
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public boolean isUserAuthzId()
     {
         return whoAmIResponse.isUserAuthzId();
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public String getAuthzIdString()
     {
         return whoAmIResponse.getAuthzIdString();
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public String getUserId()
     {
         return whoAmIResponse.getUserId();
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public Dn getDn()
     {
         return whoAmIResponse.getDn();
     }
 
 
     /**
      * Overload the parent's getResponseName method, as the WhoAmI response should not
      * contain the responseName.
      */
     @Override
     public String getResponseName()
     {
         return null;
     }
 
 
     /**
      * Compute the WhoAmIResponse extended operation length
      * <pre>
      * 0x04 L1 authzId
      * </pre>
      */
     /* no qualifier */int computeLengthInternal()
     {
         if ( whoAmIResponse.getAuthzId() != null )
         {
             return 1 + TLV.getNbBytes( whoAmIResponse.getAuthzId().length )
                 + whoAmIResponse.getAuthzId().length;
         }
         else
         {
             return 1 + 1;
         }
     }
 
 
     /**
      * Encodes the WhoAmIResponse extended operation.
      * 
      * @return A ByteBuffer that contains the encoded PDU
      * @throws org.apache.directory.api.asn1.EncoderException If anything goes wrong.
      */
     /* no qualifier */ByteBuffer encodeInternal() throws EncoderException
     {
         ByteBuffer bb = ByteBuffer.allocate( computeLengthInternal() );
 
         BerValue.encode( bb, whoAmIResponse.getAuthzId() );
 
         return bb;
     }
 }