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.decoder; 022 023 024import java.io.IOException; 025import java.util.HashMap; 026import java.util.Map; 027 028import org.apache.directory.api.util.Strings; 029import org.apache.directory.server.dns.store.DnsAttribute; 030import org.apache.mina.core.buffer.IoBuffer; 031 032 033/** 034 * A decoder for MX records. MX records are encoded as per RFC-1035: 035 * 036 * <pre> 037 * 3.3.9. MX RDATA format 038 * 039 * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ 040 * | PREFERENCE | 041 * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ 042 * / EXCHANGE / 043 * / / 044 * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ 045 * 046 * where: 047 * 048 * PREFERENCE 049 * A 16 bit integer which specifies the preference given to this RR among 050 * others at the same owner. Lower values are preferred. 051 * 052 * EXCHANGE 053 * A <domain-name> which specifies a host willing to act as a mail exchange 054 * for the owner name. 055 * </pre> 056 * 057 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 058 */ 059public class MailExchangeRecordDecoder implements RecordDecoder 060{ 061 public Map<String, Object> decode( IoBuffer byteBuffer, short length ) throws IOException 062 { 063 Map<String, Object> attributes = new HashMap<>(); 064 attributes.put( Strings.toLowerCaseAscii( DnsAttribute.MX_PREFERENCE ), byteBuffer.getShort() ); 065 attributes.put( Strings.toLowerCaseAscii( DnsAttribute.DOMAIN_NAME ), DnsMessageDecoder.getDomainName( byteBuffer ) ); 066 067 return attributes; 068 } 069}