/*
    *   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.checksum.actions;
  
  
  import org.apache.directory.api.asn1.DecoderException;
  import org.apache.directory.api.asn1.ber.grammar.GrammarAction;
  import org.apache.directory.api.asn1.ber.tlv.BerValue;
  import org.apache.directory.api.asn1.ber.tlv.IntegerDecoder;
  import org.apache.directory.api.asn1.ber.tlv.IntegerDecoderException;
  import org.apache.directory.api.asn1.ber.tlv.TLV;
  import org.apache.directory.api.i18n.I18n;
  import org.apache.directory.api.util.Strings;
  import org.apache.directory.shared.kerberos.codec.checksum.ChecksumContainer;
  import org.apache.directory.shared.kerberos.components.Checksum;
  import org.apache.directory.shared.kerberos.crypto.checksum.ChecksumType;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * Sets the Checksum's type.
   *
   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
   */
  public class StoreCksumType extends GrammarAction<ChecksumContainer>
  {
      /** The logger */
      private static final Logger LOG = LoggerFactory.getLogger( StoreCksumType.class );
  
      /** Speedup for logs */
      private static final boolean IS_DEBUG = LOG.isDebugEnabled();
  
  
      /**
       * Creates a new instance of ChecksumReadType.
       */
      public StoreCksumType()
      {
          super( "Checksum cksumtype" );
      }
  
  
      /**
       * {@inheritDoc}
       */
      public void action( ChecksumContainer checksumContainer ) throws DecoderException
      {
          TLV tlv = checksumContainer.getCurrentTLV();
  
          // The Length should not be null
          if ( tlv.getLength() == 0 )
          {
              LOG.error( I18n.err( I18n.ERR_01308_ZERO_LENGTH_TLV ) );
  
              // This will generate a PROTOCOL_ERROR
              throw new DecoderException( I18n.err( I18n.ERR_01309_EMPTY_TLV ) );
          }
  
          Checksum checksum = checksumContainer.getChecksum();
          // The Checksum's type is an integer
          BerValue value = tlv.getValue();
  
          try
          {
              int cksumType = IntegerDecoder.parse( value );
  
              checksum.setChecksumType( ChecksumType.getTypeByValue( cksumType ) );
  
              if ( IS_DEBUG )
              {
                  LOG.debug( "cksumType : {}", cksumType );
              }
          }
          catch ( IntegerDecoderException ide )
          {
              LOG.error( I18n.err( I18n.ERR_01310_INTEGER_DECODING_ERROR, Strings.dumpBytes( value.getData() ) ) );
  
              // This will generate a PROTOCOL_ERROR
              throw new DecoderException( ide.getMessage() );
          }
 
     }
 
 }