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.messages;
022    
023    
024    import org.apache.directory.server.dns.util.EnumConverter;
025    import org.apache.directory.server.dns.util.ReverseEnumMap;
026    
027    
028    /**
029     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
030     * @version $Rev: 547524 $, $Date: 2007-06-15 07:42:26 +0300 (Fri, 15 Jun 2007) $
031     */
032    public enum OpCode implements EnumConverter<Byte>
033    {
034        /** Standard query */
035        QUERY(0),
036    
037        /** Inverse query */
038        IQUERY(1),
039    
040        /** Server status request */
041        STATUS(2),
042    
043        /** Zone transfer notification */
044        NOTIFY(4),
045    
046        /** Dynamic update message */
047        UPDATE(5);
048    
049        private static ReverseEnumMap<Byte, OpCode> map = new ReverseEnumMap<Byte, OpCode>( OpCode.class );
050    
051        private final byte value;
052    
053    
054        private OpCode( int value )
055        {
056            this.value = ( byte ) value;
057        }
058    
059    
060        public Byte convert()
061        {
062            return this.value;
063        }
064    
065    
066        /**
067         * Converts an ordinal value into an {@link OpCode}.
068         *
069         * @param value
070         * @return The {@link OpCode}.
071         */
072        public static OpCode convert( byte value )
073        {
074            return map.get( value );
075        }
076    }