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
021package org.apache.directory.server.dns.io.encoder;
022
023
024import org.apache.directory.server.dns.messages.ResourceRecord;
025import org.apache.directory.server.dns.store.DnsAttribute;
026import 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 */
054public class MailExchangeRecordEncoder extends ResourceRecordEncoder
055{
056    protected void putResourceRecordData( IoBuffer byteBuffer, ResourceRecord record )
057    {
058        byteBuffer.putShort( Short.parseShort( record.get( DnsAttribute.MX_PREFERENCE ) ) );
059        putDomainName( byteBuffer, record.get( DnsAttribute.DOMAIN_NAME ) );
060    }
061}