/*
    * Copyright 2006-2010 the original author or authors.
    *
    * Licensed 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.
   */
  package org.springframework.batch.support;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  import java.io.ObjectInputStream;
  import java.io.ObjectOutputStream;
  import java.io.OptionalDataException;
  
  
  /**
   * Static utility to help with serialization.
   * 
   * @author Dave Syer
   *
   */
  public class SerializationUtils {
  
  	/**
  	 * Serialize the object provided.
  	 * 
  	 * @param object the object to serialize
  	 * @return an array of bytes representing the object in a portable fashion
  	 */
  	public static byte[] serialize(Object object) {
  
  		if (object==null) {
  			return null;
  		}
  
  		ByteArrayOutputStream stream = new ByteArrayOutputStream();
  		try {
  			new ObjectOutputStream(stream).writeObject(object);
  		} catch (IOException e) {
  			throw new IllegalArgumentException("Could not serialize object of type: "+object.getClass(), e);
  		}
  
  		return stream.toByteArray();
  
  	}
  
  	/**
  	 * @param bytes a serialized object created
  	 * @return the result of deserializing the bytes
  	 */
  	public static Object deserialize(byte[] bytes) {
  
  		if (bytes==null) {
  			return null;
  		}
  
  		try {
  			return new ObjectInputStream(new ByteArrayInputStream(bytes)).readObject();
  		}
  		catch (OptionalDataException e) {
  			throw new IllegalArgumentException("Could not deserialize object: eof="+e.eof+ " at length="+e.length, e);
  		}
  		catch (IOException e) {
  			throw new IllegalArgumentException("Could not deserialize object", e);
  		}
  		catch (ClassNotFoundException e) {
  			throw new IllegalStateException("Could not deserialize object type", e);
  		}
  
  	}
  
  }