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    package org.apache.directory.server.core.partition.impl.btree.jdbm;
021    
022    
023    import jdbm.helper.Serializer;
024    
025    import java.io.IOException;
026    
027    
028    /**
029     * A {@link Serializer} for Longs
030     *
031     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
032     * @version $Rev$
033     */
034    public class LongSerializer implements Serializer
035    {
036        private static final long serialVersionUID = 237756689544852128L;
037        public static final LongSerializer INSTANCE = new LongSerializer();
038    
039    
040        public byte[] serialize( Object o ) throws IOException
041        {
042            long id = ( Long ) o;
043            byte[] bites = new byte[8];
044    
045            bites[0] = ( byte ) ( id >> 56 );
046            bites[1] = ( byte ) ( id >> 48 );
047            bites[2] = ( byte ) ( id >> 40 );
048            bites[3] = ( byte ) ( id >> 32 );
049            bites[4] = ( byte ) ( id >> 24 );
050            bites[5] = ( byte ) ( id >> 16 );
051            bites[6] = ( byte ) ( id >> 8 );
052            bites[7] = ( byte ) id;
053    
054            return bites;
055        }
056    
057    
058        public Object deserialize( byte[] bites ) throws IOException
059        {
060            long id;
061            id = bites[0]  + ( ( bites[0] < 0 ) ? 256 : 0 );
062            id <<= 8;
063            id += bites[1] + ( ( bites[1] < 0 ) ? 256 : 0 );
064            id <<= 8;
065            id += bites[2] + ( ( bites[2] < 0 ) ? 256 : 0 );
066            id <<= 8;
067            id += bites[3] + ( ( bites[3] < 0 ) ? 256 : 0 );
068            id <<= 8;
069            id += bites[4] + ( ( bites[4] < 0 ) ? 256 : 0 );
070            id <<= 8;
071            id += bites[5] + ( ( bites[5] < 0 ) ? 256 : 0 );
072            id <<= 8;
073            id += bites[6] + ( ( bites[6] < 0 ) ? 256 : 0 );
074            id <<= 8;
075            id += bites[7] + ( ( bites[7] < 0 ) ? 256 : 0 );
076            return id;
077        }
078    }