001    /*
002     *  Licensed to the Apache Software Foundation (ASF) under one
003     *  or more contributor license agreements.  See the NOTICE file
004     *  distributed with this work for additional information
005     *  regarding copyright ownership.  The ASF licenses this file
006     *  to you under the Apache License, Version 2.0 (the
007     *  "License"); you may not use this file except in compliance
008     *  with the License.  You may obtain a copy of the License at
009     *  
010     *    http://www.apache.org/licenses/LICENSE-2.0
011     *  
012     *  Unless required by applicable law or agreed to in writing,
013     *  software distributed under the License is distributed on an
014     *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015     *  KIND, either express or implied.  See the License for the
016     *  specific language governing permissions and limitations
017     *  under the License. 
018     *  
019     */
020    package org.apache.directory.shared.ldap.codec.actions;
021    
022    
023    import org.apache.directory.shared.asn1.ber.IAsn1Container;
024    import org.apache.directory.shared.asn1.ber.grammar.GrammarAction;
025    import org.apache.directory.shared.asn1.ber.tlv.TLV;
026    import org.apache.directory.shared.asn1.codec.DecoderException;
027    import org.apache.directory.shared.ldap.codec.LdapMessageContainer;
028    import org.apache.directory.shared.ldap.codec.search.PresentFilter;
029    import org.apache.directory.shared.ldap.codec.search.SearchRequestCodec;
030    import org.apache.directory.shared.ldap.util.StringTools;
031    import org.slf4j.Logger;
032    import org.slf4j.LoggerFactory;
033    
034    
035    /**
036     * The action used to initialize the Present filter
037     * 
038     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
039     * @version $Rev$, $Date$, 
040     */
041    public class InitPresentFilterAction extends GrammarAction
042    {
043        /** The logger */
044        private static final Logger log = LoggerFactory.getLogger( InitPresentFilterAction.class );
045    
046        /** Speedup for logs */
047        private static final boolean IS_DEBUG = log.isDebugEnabled();
048    
049        public InitPresentFilterAction()
050        {
051            super( "Init present filter Value" );
052        }
053    
054        public void action( IAsn1Container container ) throws DecoderException
055        {
056            LdapMessageContainer ldapMessageContainer = ( LdapMessageContainer ) container;
057            SearchRequestCodec searchRequest = ldapMessageContainer.getSearchRequest();
058    
059            TLV tlv = ldapMessageContainer.getCurrentTLV();
060    
061            // We can allocate the Attribute Value Assertion
062            PresentFilter presentFilter = new PresentFilter( ldapMessageContainer.getTlvId() );
063    
064            // add the filter to the request filter
065            searchRequest.addCurrentFilter( presentFilter );
066            searchRequest.setTerminalFilter( presentFilter );
067    
068            String value = StringTools.utf8ToString( tlv.getValue().getData() );
069    
070            if ( StringTools.isEmpty( value ) )
071            {
072                presentFilter.setAttributeDescription( "" );
073            }
074            else
075            {
076                // Store the value.
077                String type = StringTools.utf8ToString( tlv.getValue().getData() );
078                presentFilter.setAttributeDescription( type );
079            }
080    
081            // We now have to get back to the nearest filter which is
082            // not terminal.
083            searchRequest.unstackFilters( container );
084            
085            if ( IS_DEBUG )
086            {
087                log.debug( "Initialize Present filter" );
088            }
089        }
090    }