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     */
020    
021    package org.apache.directory.server.dns.io.encoder;
022    
023    
024    import org.apache.directory.server.dns.messages.ResourceRecord;
025    import org.apache.directory.server.dns.store.DnsAttribute;
026    import org.apache.mina.core.buffer.IoBuffer;
027    
028    
029    /**
030     * 3.3.9. MX RDATA format
031     * 
032     *     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
033     *     |                  PREFERENCE                   |
034     *     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
035     *     /                   EXCHANGE                    /
036     *     /                                               /
037     *     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
038     * 
039     * where:
040     * 
041     * PREFERENCE      A 16 bit integer which specifies the preference given to
042     *                 this RR among others at the same owner.  Lower values
043     *                 are preferred.
044     * 
045     * EXCHANGE        A <domain-name> which specifies a host willing to act as
046     *                 a mail exchange for the owner name.
047     * 
048     * MX records cause type A additional section processing for the host
049     * specified by EXCHANGE.  The use of MX RRs is explained in detail in
050     * [RFC-974].
051     * 
052     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
053     * @version $Rev: 725712 $, $Date: 2008-12-11 16:32:04 +0100 (Thu, 11 Dec 2008) $
054     */
055    public class MailExchangeRecordEncoder extends ResourceRecordEncoder
056    {
057        protected void putResourceRecordData( IoBuffer byteBuffer, ResourceRecord record )
058        {
059            byteBuffer.putShort( Short.parseShort( record.get( DnsAttribute.MX_PREFERENCE ) ) );
060            putDomainName( byteBuffer, record.get( DnsAttribute.DOMAIN_NAME ) );
061        }
062    }