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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.ldapMessage;
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 initialize an LdapMessage
36   * <pre>
37   * LDAPMessage --&gt; SEQUENCE { ...
38   *
39   * We have a LDAPMessage, and the tag must be 0x30.
40   *
41   * The next state will be LDAP_MESSAGE_STATE
42   * </pre>
43   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
44   */
45  public class InitLdapMessage extends GrammarAction<LdapMessageContainer<MessageDecorator<? extends Message>>>
46  {
47      /** The logger */
48      private static final Logger LOG = LoggerFactory.getLogger( InitLdapMessage.class );
49  
50  
51      /**
52       * Instantiates a new action.
53       */
54      public InitLdapMessage()
55      {
56          super( "LdapMessage initialization" );
57      }
58  
59  
60      /**
61       * {@inheritDoc}
62       */
63      public void action( LdapMessageContainer<MessageDecorator<? extends Message>> container ) throws DecoderException
64      {
65          TLV tlv = container.getCurrentTLV();
66  
67          // The Length should not be null
68          if ( tlv.getLength() == 0 )
69          {
70              LOG.error( I18n.err( I18n.ERR_04066 ) );
71  
72              // This will generate a PROTOCOL_ERROR
73              throw new DecoderException( I18n.err( I18n.ERR_04067 ) );
74          }
75      }
76  }