/*
    *  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
    *
   *    https://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.actions.request.search;
  
  
  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.ldap.codec.api.LdapCodecConstants;
  import org.apache.directory.api.ldap.codec.api.LdapMessageContainer;
  import org.apache.directory.api.ldap.model.message.AliasDerefMode;
  import org.apache.directory.api.ldap.model.message.SearchRequest;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * The action used to store the SearchRequest derefAlias flag
   * <pre>
   * SearchRequest ::= [APPLICATION 3] SEQUENCE {
   *     ...
   *     derefAliases ENUMERATED {
   *         neverDerefAliases   (0),
   *         derefInSearching    (1),
   *         derefFindingBaseObj (2),
   *         derefAlways         (3) },
   *     ...
   * </pre>
   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
   */
  public class StoreSearchRequestDerefAlias extends GrammarAction<LdapMessageContainer<SearchRequest>>
  {
      /** The logger */
      private static final Logger LOG = LoggerFactory.getLogger( StoreSearchRequestDerefAlias.class );
  
      /**
       * Instantiates a new action.
       */
      public StoreSearchRequestDerefAlias()
      {
          super( "Store SearchRequest derefAlias flag" );
      }
  
  
      /**
       * {@inheritDoc}
       */
      public void action( LdapMessageContainer<SearchRequest> container ) throws DecoderException
      {
          SearchRequest searchRequest = container.getMessage();
  
          TLV tlv = container.getCurrentTLV();
  
          // We have to check that this is a correct derefAliases
          BerValue value = tlv.getValue();
  
          try
          {
              int derefAliases = IntegerDecoder.parse( value, LdapCodecConstants.NEVER_DEREF_ALIASES,
                  LdapCodecConstants.DEREF_ALWAYS );
              searchRequest.setDerefAliases( AliasDerefMode.getDerefMode( derefAliases ) );
          }
          catch ( IntegerDecoderException ide )
          {
              String msg = I18n.err( I18n.ERR_05150_BAD_DEREF_ALIAS, value.toString() );
              LOG.error( msg );
              throw new DecoderException( msg, ide );
          }
  
  
          if ( LOG.isDebugEnabled() )
          {
              switch ( searchRequest.getDerefAliases() )
              {
                  case NEVER_DEREF_ALIASES:
                      LOG.debug( I18n.msg( I18n.MSG_05161_HANDLING_OBJECT_STRATEGY, "NEVER_DEREF_ALIASES" ) );
                      break;
  
                 case DEREF_IN_SEARCHING:
                     LOG.debug( I18n.msg( I18n.MSG_05161_HANDLING_OBJECT_STRATEGY, "DEREF_IN_SEARCHING" ) );
                     break;
 
                 case DEREF_FINDING_BASE_OBJ:
                     LOG.debug( I18n.msg( I18n.MSG_05161_HANDLING_OBJECT_STRATEGY, "DEREF_FINDING_BASE_OBJ" ) );
                     break;
 
                 case DEREF_ALWAYS:
                     LOG.debug( I18n.msg( I18n.MSG_05161_HANDLING_OBJECT_STRATEGY, "DEREF_ALWAYS" ) );
                     break;
 
                 default:
                     LOG.debug( I18n.msg( I18n.MSG_05161_HANDLING_OBJECT_STRATEGY, "UNKNOWN" ) );
             }
         }
     }
 }