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/*
 *  streams library
 *
 *  Copyright (C) 2011-2014 by Christian Bockermann, Hendrik Blom
 * 
 *  streams is a library, API and runtime environment for processing high
 *  volume data streams. It is composed of three submodules "stream-api",
 *  "stream-core" and "stream-runtime".
 *
 *  The streams library (and its submodules) is free software: you can 
 *  redistribute it and/or modify it under the terms of the 
 *  GNU Affero General Public License as published by the Free Software 
 *  Foundation, either version 3 of the License, or (at your option) any 
 *  later version.
 *
 *  The stream.ai library (and its submodules) is distributed in the hope
 *  that it will be useful, but WITHOUT ANY WARRANTY; without even the implied 
 *  warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package stream.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Serializable;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import stream.io.Serializer;

/**
 * 
 * An implementation of the Serializer interface that uses the plain built-in
 * Java serialization.
 * 

 * 
 * @author Christian Bockermann <chris@jwall.org>
 * 
 */
public class JavaSerializer implements Serializer {

	final static Logger log = LoggerFactory.getLogger(JavaSerializer.class);

	/**
	 * @see stream.io.Serializer#clone(java.io.Serializable)
	 */
	@Override
	public Serializable clone(Serializable object) throws Exception {
		if (object == null)
			return null;

		try {
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			write(object, baos);
			baos.flush();
			baos.close();
			ByteArrayInputStream bais = new ByteArrayInputStream(
					baos.toByteArray());
			Serializable value = read(bais);
			bais.close();

			return value;
		} catch (Exception e) {
			log.error("Cloning object {} failed: {}", object, e.getMessage());
			throw new Exception(e.getMessage());
		}
	}

	/**
	 * @see stream.io.Serializer#read(java.io.InputStream)
	 */
	@Override
	public Serializable read(InputStream in) throws IOException {
		try {
			ObjectInputStream ois = new ObjectInputStream(in);
			Serializable value = (Serializable) ois.readObject();
			return value;
		} catch (Exception e) {
			log.error(
					"De-serialization of object from input-stream {} failed: {}",
					in, e.getMessage());
			throw new IOException(e.getMessage());
		}
	}

	/**
	 * @see stream.io.Serializer#write(java.io.Serializable,
	 *      java.io.OutputStream)
	 */
	@Override
	public void write(Serializable object, OutputStream out) throws IOException {
		try {
			ObjectOutputStream oos = new ObjectOutputStream(out);
			oos.writeObject(object);
			oos.flush();
		} catch (Exception e) {
			log.error("Serialization of object {} failed: {}", object,
					e.getMessage());
			throw new IOException(e.getMessage());
		}
	}
}