/*
    *   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.pwdModify;
  
  
  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.TLV;
  import org.apache.directory.api.asn1.ber.tlv.UniversalTag;
  import org.apache.directory.api.i18n.I18n;
  import org.apache.directory.api.ldap.codec.api.ExtendedRequestDecorator;
  import org.apache.directory.api.ldap.codec.api.LdapApiService;
  import org.apache.directory.api.ldap.extras.extended.pwdModify.PasswordModifyRequest;
  import org.apache.directory.api.ldap.extras.extended.pwdModify.PasswordModifyResponse;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * A Decorator for PasswordModifyRequest extended request.
   *
   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
   */
  public class PasswordModifyRequestDecorator extends ExtendedRequestDecorator<PasswordModifyRequest> 
      implements PasswordModifyRequest
  {
      private static final Logger LOG = LoggerFactory.getLogger( PasswordModifyRequestDecorator.class );
  
      /** The internal PasswordModifyRequest */
      private PasswordModifyRequest passwordModifyRequest;
  
      /** stores the length of the request*/
      private int requestLength = 0;
  
  
      /**
       * Create a new decorator instance 
       * @param codec The codec service
       * @param decoratedMessage The decorated PwdModifyRequest
       */
      public PasswordModifyRequestDecorator( LdapApiService codec, PasswordModifyRequest decoratedMessage )
      {
          super( codec, decoratedMessage );
          passwordModifyRequest = decoratedMessage;
      }
  
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void setRequestValue( byte[] requestValue )
      {
          PasswordModifyRequestDecoder decoder = new PasswordModifyRequestDecoder();
  
          try
          {
              passwordModifyRequest = decoder.decode( requestValue );
              
              if ( requestValue != null )
              {
                  this.requestValue = new byte[requestValue.length];
                  System.arraycopy( requestValue, 0, this.requestValue, 0, requestValue.length );
              }
              else
              {
                  this.requestValue = null;
              }
          }
          catch ( DecoderException e )
          {
              LOG.error( I18n.err( I18n.ERR_04165 ), e );
              throw new RuntimeException( e );
          }
      }
  
  
      /**
       * {@inheritDoc}
       */
     @Override
     public byte[] getRequestValue()
     {
         if ( requestValue == null )
         {
             try
             {
                 requestValue = encodeInternal().array();
             }
             catch ( EncoderException e )
             {
                 LOG.error( I18n.err( I18n.ERR_04167 ), e );
                 throw new RuntimeException( e );
             }
         }
 
         return requestValue;
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public PasswordModifyResponse getResultResponse()
     {
         return ( PasswordModifyResponse ) passwordModifyRequest.getResultResponse();
     }
 
 
     /**
      * {@inheritDoc}
      */
     public byte[] getUserIdentity()
     {
         return passwordModifyRequest.getUserIdentity();
     }
 
 
     /**
      * @param userIdentity the userIdentity to set
      */
     public void setUserIdentity( byte[] userIdentity )
     {
         passwordModifyRequest.setUserIdentity( userIdentity );
     }
 
 
     /**
      * {@inheritDoc}
      */
     public byte[] getOldPassword()
     {
         return passwordModifyRequest.getOldPassword();
     }
 
 
     /**
      * @param oldPassword the oldPassword to set
      */
     public void setOldPassword( byte[] oldPassword )
     {
         passwordModifyRequest.setOldPassword( oldPassword );
     }
 
 
     /**
      * {@inheritDoc}
      */
     public byte[] getNewPassword()
     {
         return passwordModifyRequest.getNewPassword();
     }
 
 
     /**
      * @param newPassword the newPassword to set
      */
     public void setNewPassword( byte[] newPassword )
     {
         passwordModifyRequest.setNewPassword( newPassword );
     }
 
 
     /**
      * Compute the PasswordModifyRequest extended operation length
      * <pre>
      * 0x30 L1 
      *   | 
      *  [+-- 0x80 L2 userIdentity] 
      *  [+-- 0x81 L3 oldPassword] 
      *  [+-- 0x82 L4 newPassword] 
      * </pre>
      */
     /* No qualifier */ int computeLengthInternal()
     {
         requestLength = 0;
 
         if ( passwordModifyRequest.getUserIdentity() != null )
         {
             int len = passwordModifyRequest.getUserIdentity().length;
             requestLength = 1 + TLV.getNbBytes( len ) + len;
         }
 
         if ( passwordModifyRequest.getOldPassword() != null )
         {
             int len = passwordModifyRequest.getOldPassword().length;
             requestLength += 1 + TLV.getNbBytes( len ) + len;
         }
 
         if ( passwordModifyRequest.getNewPassword() != null )
         {
             int len = passwordModifyRequest.getNewPassword().length;
             requestLength += 1 + TLV.getNbBytes( len ) + len;
         }
 
         return 1 + TLV.getNbBytes( requestLength ) + requestLength;
     }
 
 
     /**
      * Encodes the PasswordModifyRequest 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() );
 
         bb.put( UniversalTag.SEQUENCE.getValue() );
         bb.put( TLV.getBytes( requestLength ) );
 
         if ( passwordModifyRequest.getUserIdentity() != null )
         {
             byte[] userIdentity = passwordModifyRequest.getUserIdentity();
             bb.put( ( byte ) PasswordModifyRequestConstants.USER_IDENTITY_TAG );
             bb.put( TLV.getBytes( userIdentity.length ) );
             bb.put( userIdentity );
         }
 
         if ( passwordModifyRequest.getOldPassword() != null )
         {
             byte[] oldPassword = passwordModifyRequest.getOldPassword();
             bb.put( ( byte ) PasswordModifyRequestConstants.OLD_PASSWORD_TAG );
             bb.put( TLV.getBytes( oldPassword.length ) );
             bb.put( oldPassword );
         }
 
         if ( passwordModifyRequest.getNewPassword() != null )
         {
             byte[] newPassword = passwordModifyRequest.getNewPassword();
             bb.put( ( byte ) PasswordModifyRequestConstants.NEW_PASSWORD_TAG );
             bb.put( TLV.getBytes( newPassword.length ) );
             bb.put( newPassword );
         }
 
         return bb;
     }
 }