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.decoder;
022    
023    
024    import java.io.IOException;
025    import java.net.InetAddress;
026    import java.util.HashMap;
027    import java.util.Map;
028    
029    import org.apache.directory.server.dns.store.DnsAttribute;
030    import org.apache.mina.core.buffer.IoBuffer;
031    
032    
033    /**
034     * A decoder for A records. As per RFC 1035
035     * 
036     * <pre>
037     *   3.4.1. A RDATA format
038     *
039     *     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
040     *     |                    ADDRESS                    |
041     *     +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
042     *
043     *   where:
044     *
045     *   ADDRESS
046     *       A 32 bit Internet address. 
047     * </pre>
048     * 
049     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
050     * @version $Rev$, $Date$
051     */
052    public class AddressRecordDecoder implements RecordDecoder
053    {
054        public Map<String, Object> decode( IoBuffer byteBuffer, short length ) throws IOException
055        {
056            Map<String, Object> attributes = new HashMap<String, Object>();
057            byte[] addressBytes = new byte[length];
058            byteBuffer.get( addressBytes );
059            attributes.put( DnsAttribute.IP_ADDRESS, InetAddress.getByAddress( addressBytes ) );
060            return attributes;
061        }
062    }