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 021package org.apache.directory.server.core.shared; 022 023 024import java.io.IOException; 025 026import org.apache.directory.api.util.Strings; 027 028import jdbm.helper.Serializer; 029 030 031/** 032 * A JDBM Serializer that serializes null or empty strings and always deserializes them as empty string values. 033 * 034 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 035 */ 036public class NullStringSerializer implements Serializer 037{ 038 039 public static final NullStringSerializer INSTANCE = new NullStringSerializer(); 040 041 042 @Override 043 public Object deserialize( byte[] data ) throws IOException 044 { 045 return ""; 046 } 047 048 049 @Override 050 public byte[] serialize( Object nullStr ) throws IOException 051 { 052 return Strings.EMPTY_BYTES; 053 } 054 055}