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 java.io.IOException;
024
025 import jdbm.helper.Serializer;
026
027
028 /**
029 * A custom String serializer to [de]serialize Strings.
030 *
031 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
032 * @version $Rev$, $Date$
033 */
034 public class StringSerializer implements Serializer
035 {
036 private static final long serialVersionUID = -173163945773783649L;
037
038
039 /* (non-Javadoc)
040 * @see jdbm.helper.Serializer#deserialize(byte[])
041 */
042 public Object deserialize( byte[] bites ) throws IOException
043 {
044 if ( bites.length == 0 )
045 {
046 return "";
047 }
048
049 char[] strchars = new char[bites.length >> 1];
050 for ( int ii = 0, jj = 0; ii < strchars.length; ii++, jj = ii << 1 )
051 {
052 int ch = bites[jj] << 8 & 0x0000FF00;
053 ch |= bites[jj+1] & 0x000000FF;
054 strchars[ii] = ( char ) ch;
055 }
056 return new String( strchars );
057 }
058
059
060 private static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
061
062 /* (non-Javadoc)
063 * @see jdbm.helper.Serializer#serialize(java.lang.Object)
064 */
065 public byte[] serialize( Object str ) throws IOException
066 {
067 if ( ( ( String ) str ).length() == 0 )
068 {
069 return EMPTY_BYTE_ARRAY;
070 }
071
072 char[] strchars = ( ( String ) str ).toCharArray();
073 byte[] bites = new byte[strchars.length<<1];
074 for ( int ii = 0, jj = 0; ii < strchars.length; ii++, jj = ii << 1 )
075 {
076 bites[jj] = ( byte ) ( strchars[ii] >> 8 & 0x00FF );
077 bites[jj+1] = ( byte ) ( strchars[ii] & 0x00FF );
078 }
079
080 return bites;
081 }
082 }