| package org.apache.jcs.utils.serialization; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| import java.io.BufferedInputStream; |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectOutputStream; |
| import java.io.Serializable; |
| |
| import org.apache.jcs.engine.behavior.IElementSerializer; |
| import org.apache.jcs.utils.zip.CompressionUtil; |
| |
| /** |
| * Performs default serialization and de-serialization. It gzips the value. |
| */ |
| public class CompressingSerializer |
| implements IElementSerializer |
| { |
| /** |
| * Serializes an object using default serilaization. Compresses the byte array. |
| * <p> |
| * @param obj object |
| * @return byte[] |
| * @throws IOException on i/o problem |
| */ |
| public byte[] serialize( Serializable obj ) |
| throws IOException |
| { |
| byte[] uncompressed = serializeObject( obj ); |
| byte[] compressed = CompressionUtil.compressByteArray( uncompressed ); |
| return compressed; |
| } |
| |
| /** |
| * Does the basic serialization. |
| * <p> |
| * @param obj object |
| * @return byte[] |
| * @throws IOException on i/o problem |
| */ |
| protected byte[] serializeObject( Serializable obj ) |
| throws IOException |
| { |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| ObjectOutputStream oos = new ObjectOutputStream( baos ); |
| try |
| { |
| oos.writeObject( obj ); |
| } |
| finally |
| { |
| oos.close(); |
| } |
| byte[] uncompressed = baos.toByteArray(); |
| return uncompressed; |
| } |
| |
| /** |
| * Uses default de-serialization to turn a byte array into an object. Decompresses the value |
| * first. All exceptions are converted into IOExceptions. |
| * <p> |
| * @param data bytes of data |
| * @return Object |
| * @throws IOException on i/o problem |
| * @throws ClassNotFoundException if class is not found during deserialization |
| */ |
| public Object deSerialize( byte[] data ) |
| throws IOException, ClassNotFoundException |
| { |
| if ( data == null ) |
| { |
| return null; |
| } |
| byte[] decompressedByteArray = CompressionUtil.decompressByteArray( data ); |
| return deserializeObject( decompressedByteArray ); |
| } |
| |
| /** |
| * Does the standard deserialization. |
| * <p> |
| * @param decompressedByteArray array of decompressed bytes |
| * @return Object |
| * @throws IOException on i/o error |
| * @throws ClassNotFoundException if class is not found during deserialization |
| */ |
| protected Object deserializeObject( byte[] decompressedByteArray ) |
| throws IOException, ClassNotFoundException |
| { |
| ByteArrayInputStream bais = new ByteArrayInputStream( decompressedByteArray ); |
| BufferedInputStream bis = new BufferedInputStream( bais ); |
| ObjectInputStream ois = new ObjectInputStream( bis ); |
| |
| try |
| { |
| try |
| { |
| return ois.readObject(); |
| } |
| catch ( IOException e ) |
| { |
| throw e; |
| } |
| catch ( ClassNotFoundException e ) |
| { |
| throw e; |
| } |
| } |
| finally |
| { |
| ois.close(); |
| } |
| } |
| } |