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 java.io.IOException; 024 025import jdbm.helper.Serializer; 026 027import org.apache.directory.api.util.Strings; 028 029 030/** 031 * A custom String serializer to [de]serialize Strings. 032 * 033 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 034 */ 035public final class StringSerializer implements Serializer 036{ 037 private static final long serialVersionUID = -173163945773783649L; 038 039 /** A static instance of a StringSerializer */ 040 public static final StringSerializer INSTANCE = new StringSerializer(); 041 042 043 /** 044 * Default private constructor 045 */ 046 private StringSerializer() 047 { 048 } 049 050 051 /* (non-Javadoc) 052 * @see jdbm.helper.Serializer#deserialize(byte[]) 053 */ 054 public Object deserialize( byte[] bytes ) throws IOException 055 { 056 if ( bytes.length == 0 ) 057 { 058 return ""; 059 } 060 061 char[] strchars = new char[bytes.length >> 1]; 062 int pos = 0; 063 064 for ( int i = 0; i < bytes.length; i += 2 ) 065 { 066 strchars[pos++] = ( char ) ( ( ( bytes[i] << 8 ) & 0x0000FF00 ) | ( bytes[i + 1] & 0x000000FF ) ); 067 } 068 069 return new String( strchars ); 070 } 071 072 073 /* (non-Javadoc) 074 * @see jdbm.helper.Serializer#serialize(java.lang.Object) 075 */ 076 public byte[] serialize( Object str ) throws IOException 077 { 078 if ( ( ( String ) str ).length() == 0 ) 079 { 080 return Strings.EMPTY_BYTES; 081 } 082 083 char[] strchars = ( ( String ) str ).toCharArray(); 084 byte[] bites = new byte[strchars.length << 1]; 085 int pos = 0; 086 087 for ( char c : strchars ) 088 { 089 bites[pos++] = ( byte ) ( c >> 8 & 0x00FF ); 090 bites[pos++] = ( byte ) ( c & 0x00FF ); 091 } 092 093 return bites; 094 } 095}