/*
    *  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.searchRequest.filter;
  
  
  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.decorators.SearchRequestDecorator;
  import org.apache.directory.api.ldap.codec.search.PresentFilter;
  import org.apache.directory.api.util.Strings;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * The action used to initialize the Present filter
   * 
   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
   */
  public class InitPresentFilter extends GrammarAction<LdapMessageContainer<SearchRequestDecorator>>
  {
      /** The logger */
      private static final Logger LOG = LoggerFactory.getLogger( InitPresentFilter.class );
  
      /** Speedup for logs */
      private static final boolean IS_DEBUG = LOG.isDebugEnabled();
  
  
      /**
       * Instantiates a new init present filter action.
       */
      public InitPresentFilter()
      {
          super( "Init present filter Value" );
      }
  
  
      /**
       * {@inheritDoc}
       */
      public void action( LdapMessageContainer<SearchRequestDecorator> container ) throws DecoderException
      {
          SearchRequestDecorator searchRequestDecorator = container.getMessage();
  
          TLV tlv = container.getCurrentTLV();
  
          // We can allocate the Attribute Value Assertion
          PresentFilter presentFilter = new PresentFilter( container.getTlvId() );
  
          // add the filter to the request filter
          searchRequestDecorator.addCurrentFilter( presentFilter );
          searchRequestDecorator.setTerminalFilter( presentFilter );
  
          String value = Strings.utf8ToString( tlv.getValue().getData() );
  
          if ( Strings.isEmpty( value ) )
          {
              presentFilter.setAttributeDescription( "" );
          }
          else
          {
              // Store the value.
              String type = Strings.utf8ToString( tlv.getValue().getData() );
              presentFilter.setAttributeDescription( type );
          }
  
          // We now have to get back to the nearest filter which is
          // not terminal.
          searchRequestDecorator.unstackFilters( container );
  
          if ( IS_DEBUG )
          {
              LOG.debug( "Initialize Present filter" );
          }
      }
  }