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 * https://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.model.message.Message;
29 import org.slf4j.Logger;
30 import org.slf4j.LoggerFactory;
31
32
33 /**
34 * The action used to check that the TLV length is not null
35 *
36 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
37 */
38 public class CheckLengthNotNull extends GrammarAction<LdapMessageContainer<Message>>
39 {
40 /** The logger */
41 private static final Logger LOG = LoggerFactory.getLogger( CheckLengthNotNull.class );
42
43
44 /**
45 * Instantiates the action.
46 */
47 public CheckLengthNotNull()
48 {
49 super( "Check that the length is not null" );
50 }
51
52
53 /**
54 * {@inheritDoc}
55 */
56 public void action( LdapMessageContainer<Message> container ) throws DecoderException
57 {
58 TLV tlv = container.getCurrentTLV();
59 int expectedLength = tlv.getLength();
60
61 // The Length should be null
62 if ( expectedLength == 0 )
63 {
64 String msg = I18n.err( I18n.ERR_08213_NULL_CONTROL_LENGTH );
65 LOG.error( msg );
66
67 // This will generate a PROTOCOL_ERROR
68 throw new DecoderException( msg );
69 }
70 }
71 }