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 */
020package org.apache.directory.api.ldap.codec.actions;
021
022
023import org.apache.directory.api.asn1.DecoderException;
024import org.apache.directory.api.asn1.ber.grammar.GrammarAction;
025import org.apache.directory.api.asn1.ber.tlv.TLV;
026import org.apache.directory.api.i18n.I18n;
027import org.apache.directory.api.ldap.codec.api.LdapMessageContainer;
028import org.apache.directory.api.ldap.codec.api.MessageDecorator;
029import org.apache.directory.api.ldap.model.message.Message;
030import org.slf4j.Logger;
031import org.slf4j.LoggerFactory;
032
033
034/**
035 * The action used to check that the TLV length is not null
036 *
037 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
038 */
039public class CheckLengthNotNull extends GrammarAction<LdapMessageContainer<MessageDecorator<? extends Message>>>
040{
041    /** The logger */
042    private static final Logger LOG = LoggerFactory.getLogger( CheckLengthNotNull.class );
043
044
045    /**
046     * Instantiates the action.
047     */
048    public CheckLengthNotNull()
049    {
050        super( "Check that the length is not null" );
051    }
052
053
054    /**
055     * {@inheritDoc}
056     */
057    public void action( LdapMessageContainer<MessageDecorator<? extends Message>> container ) throws DecoderException
058    {
059        TLV tlv = container.getCurrentTLV();
060        int expectedLength = tlv.getLength();
061
062        // The Length should be null
063        if ( expectedLength == 0 )
064        {
065            String msg = I18n.err( I18n.ERR_04096 );
066            LOG.error( msg );
067
068            // This will generate a PROTOCOL_ERROR
069            throw new DecoderException( msg );
070        }
071    }
072}