/*
    *  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.codec.actions.ldapResult;
  
  
  import org.apache.directory.api.asn1.DecoderException;
  import org.apache.directory.api.asn1.ber.grammar.GrammarAction;
  import org.apache.directory.api.asn1.ber.tlv.TLV;
  import org.apache.directory.api.ldap.codec.api.LdapMessageContainer;
  import org.apache.directory.api.ldap.codec.api.MessageDecorator;
  import org.apache.directory.api.ldap.model.message.LdapResult;
  import org.apache.directory.api.ldap.model.message.Message;
  import org.apache.directory.api.ldap.model.message.ResultResponse;
  import org.apache.directory.api.util.Strings;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * The action used to set the LdapResult error message.
   *
   * <pre>
   *  LDAPResult ::= SEQUENCE {
   *     ...
   *     errorMessage LDAPString,
   *     ...
   * </pre>
   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
   */
  public class StoreErrorMessage extends GrammarAction<LdapMessageContainer<MessageDecorator<? extends Message>>>
  {
      /** The logger */
      private static final Logger LOG = LoggerFactory.getLogger( StoreErrorMessage.class );
  
      /** Speedup for logs */
      private static final boolean IS_DEBUG = LOG.isDebugEnabled();
  
  
      /**
       * Instantiates a new error message action.
       */
      public StoreErrorMessage()
      {
          super( "Store error message" );
      }
  
  
      /**
       * {@inheritDoc}
       */
      public void action( LdapMessageContainer<MessageDecorator<? extends Message>> container ) throws DecoderException
      {
          // Get the Value and store it in the BindResponse
          TLV tlv = container.getCurrentTLV();
          String errorMessage;
  
          // We have to handle the special case of a 0 length error
          // message
          if ( tlv.getLength() == 0 )
          {
              errorMessage = "";
          }
          else
          {
              errorMessage = Strings.utf8ToString( tlv.getValue().getData() );
          }
  
          ResultResponse response = ( ResultResponse ) container.getMessage();
          LdapResult ldapResult = response.getLdapResult();
          ldapResult.setDiagnosticMessage( errorMessage );
  
          // We can have an END transition
          container.setGrammarEndAllowed( true );
  
          if ( IS_DEBUG )
          {
              LOG.debug( "The error message is : " + errorMessage );
          }
      }
  }