View Javadoc
1   /*
2    *  Licensed to the Apache Software Foundation (ASF) under one
3    *  or more contributor license agreements.  See the NOTICE file
4    *  distributed with this work for additional information
5    *  regarding copyright ownership.  The ASF licenses this file
6    *  to you under the Apache License, Version 2.0 (the
7    *  "License"); you may not use this file except in compliance
8    *  with the License.  You may obtain a copy of the License at
9    *
10   *    http://www.apache.org/licenses/LICENSE-2.0
11   *
12   *  Unless required by applicable law or agreed to in writing,
13   *  software distributed under the License is distributed on an
14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   *  KIND, either express or implied.  See the License for the
16   *  specific language governing permissions and limitations
17   *  under the License.
18   *
19   */
20  package org.apache.directory.api.ldap.codec.actions;
21  
22  
23  import org.apache.directory.api.asn1.DecoderException;
24  import org.apache.directory.api.asn1.ber.grammar.GrammarAction;
25  import org.apache.directory.api.asn1.ber.tlv.TLV;
26  import org.apache.directory.api.i18n.I18n;
27  import org.apache.directory.api.ldap.codec.api.LdapMessageContainer;
28  import org.apache.directory.api.ldap.codec.api.MessageDecorator;
29  import org.apache.directory.api.ldap.model.message.Message;
30  import org.slf4j.Logger;
31  import org.slf4j.LoggerFactory;
32  
33  
34  /**
35   * The action used to check that the TLV length is not null
36   *
37   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
38   */
39  public class CheckLengthNotNull extends GrammarAction<LdapMessageContainer<MessageDecorator<? extends Message>>>
40  {
41      /** The logger */
42      private static final Logger LOG = LoggerFactory.getLogger( CheckLengthNotNull.class );
43  
44  
45      /**
46       * Instantiates the action.
47       */
48      public CheckLengthNotNull()
49      {
50          super( "Check that the length is not null" );
51      }
52  
53  
54      /**
55       * {@inheritDoc}
56       */
57      public void action( LdapMessageContainer<MessageDecorator<? extends Message>> container ) throws DecoderException
58      {
59          TLV tlv = container.getCurrentTLV();
60          int expectedLength = tlv.getLength();
61  
62          // The Length should be null
63          if ( expectedLength == 0 )
64          {
65              String msg = I18n.err( I18n.ERR_04096 );
66              LOG.error( msg );
67  
68              // This will generate a PROTOCOL_ERROR
69              throw new DecoderException( msg );
70          }
71      }
72  }