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 */
020package org.apache.directory.server.core.partition.impl.btree.jdbm;
021
022
023import jdbm.helper.Serializer;
024
025import 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 */
033public class LongSerializer implements Serializer
034{
035    private static final long serialVersionUID = 237756689544852128L;
036    public static final LongSerializer INSTANCE = new LongSerializer();
037
038
039    public byte[] serialize( Object o ) throws IOException
040    {
041        long id = ( Long ) o;
042        byte[] bites = new byte[8];
043
044        bites[0] = ( byte ) ( id >> 56 );
045        bites[1] = ( byte ) ( id >> 48 );
046        bites[2] = ( byte ) ( id >> 40 );
047        bites[3] = ( byte ) ( id >> 32 );
048        bites[4] = ( byte ) ( id >> 24 );
049        bites[5] = ( byte ) ( id >> 16 );
050        bites[6] = ( byte ) ( id >> 8 );
051        bites[7] = ( byte ) id;
052
053        return bites;
054    }
055
056
057    public Object deserialize( byte[] bytes ) throws IOException
058    {
059        return  ( ( long ) ( bytes[0] & 0xFF ) << 56 )
060                | ( ( long ) ( bytes[1] & 0xFF ) << 48 )
061                | ( ( long ) ( bytes[2] & 0xFF ) << 40 )
062                | ( ( long ) ( bytes[3] & 0xFF ) << 32 )
063                | ( ( long ) ( bytes[4] & 0xFF ) << 24 )
064                | ( ( long ) ( bytes[5] & 0xFF ) << 16 )
065                | ( ( long ) ( bytes[6] & 0xFF ) << 8 )
066                | ( ( long ) ( bytes[7] & 0xFF ) );
067    }
068}