/*
    *  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.shared.kerberos.codec.actions;
  
  
  import org.apache.directory.api.asn1.DecoderException;
  import org.apache.directory.api.asn1.ber.Asn1Container;
  import org.apache.directory.api.asn1.ber.Asn1Decoder;
  import org.apache.directory.api.asn1.ber.grammar.GrammarAction;
  import org.apache.directory.api.asn1.ber.tlv.TLV;
  import org.apache.directory.api.i18n.I18n;
  import org.apache.directory.shared.kerberos.codec.encryptedData.EncryptedDataContainer;
  import org.apache.directory.shared.kerberos.components.EncryptedData;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * The action used to read the EncryptedData
   *
   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
   */
  public abstract class AbstractReadEncryptedPart<E extends Asn1Container> extends GrammarAction<E>
  {
      /** The logger */
      private static final Logger LOG = LoggerFactory.getLogger( AbstractReadEncryptedPart.class );
  
      /** Speedup for logs */
      private static final boolean IS_DEBUG = LOG.isDebugEnabled();
  
  
      /**
       * Instantiates a new AbstractReadEncryptedPart action.
       */
      public AbstractReadEncryptedPart( String name )
      {
          super( name );
      }
  
  
      /**
       *
       * set the EncryptedData on the ASN.1 object present in the container
       *
       * @param encryptedData the encrypted data
       * @param container the container holding ASN.1 object
       */
      protected abstract void setEncryptedData( EncryptedData encryptedData, E container );
  
  
      /**
       * {@inheritDoc}
       */
      public final void action( E container ) throws DecoderException
      {
          TLV tlv = container.getCurrentTLV();
  
          // The Length should not be null
          if ( tlv.getLength() == 0 )
          {
              LOG.error( I18n.err( I18n.ERR_04066 ) );
  
              // This will generate a PROTOCOL_ERROR
              throw new DecoderException( I18n.err( I18n.ERR_04067 ) );
          }
  
          // Now, let's decode the PrincipalName
          Asn1Decoder encryptedDataDecoder = new Asn1Decoder();
  
          EncryptedDataContainer encryptedDataContainer = new EncryptedDataContainer();
          encryptedDataContainer.setStream( container.getStream() );
  
          // Decode the Ticket PDU
          try
          {
              encryptedDataDecoder.decode( container.getStream(), encryptedDataContainer );
          }
          catch ( DecoderException de )
          {
              throw de;
          }
  
         EncryptedData encryptedData = encryptedDataContainer.getEncryptedData();
 
         if ( IS_DEBUG )
         {
             LOG.debug( "EncryptedData : " + encryptedData );
         }
 
         setEncryptedData( encryptedData, container );
 
         // Update the TLV
         tlv.setExpectedLength( tlv.getExpectedLength() - tlv.getLength() );
 
         // Update the parent
         container.updateParent();
 
         container.setGrammarEndAllowed( true );
     }
 }