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.ldapMessage;
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.model.message.Message;
029import org.slf4j.Logger;
030import org.slf4j.LoggerFactory;
031
032
033/**
034 * The action used to initialize an LdapMessage
035 * <pre>
036 * LDAPMessage --&gt; SEQUENCE { ...
037 *
038 * We have a LDAPMessage, and the tag must be 0x30.
039 *
040 * The next state will be LDAP_MESSAGE_STATE
041 * </pre>
042 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
043 */
044public class InitLdapMessage extends GrammarAction<LdapMessageContainer<Message>>
045{
046    /** The logger */
047    private static final Logger LOG = LoggerFactory.getLogger( InitLdapMessage.class );
048
049
050    /**
051     * Instantiates a new action.
052     */
053    public InitLdapMessage()
054    {
055        super( "LdapMessage initialization" );
056    }
057
058
059    /**
060     * {@inheritDoc}
061     */
062    @Override
063    public void action( LdapMessageContainer<Message> container ) throws DecoderException
064    {
065        TLV tlv = container.getCurrentTLV();
066
067        // The Length should not be null
068        if ( tlv.getLength() == 0 )
069        {
070            LOG.error( I18n.err( I18n.ERR_05142_ZERO_LENGTH_MESSAGE ) );
071
072            // This will generate a PROTOCOL_ERROR
073            throw new DecoderException( I18n.err( I18n.ERR_05143_EMPTY_MESSAGE ) );
074        }
075    }
076}