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Turbine is a servlet based framework that allows experienced Java developers to quickly build secure web applications. Parts of Turbine can also be used independently of the web portion of Turbine as well. In other words, we strive to make portions of Turbine easily available for use in other applications.

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package org.apache.turbine.util;

/*
 * 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.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Map;

/**
 * This is where common Object manipulation routines should go.
 *
 * @author Nissim Karpenstein
 * @author Henning P. Schmiedehausen
 * @version $Id: ObjectUtils.java 1812628 2017-10-19 12:34:25Z gk $
 */
public abstract class ObjectUtils
{
    /**
     * Converts a map to a byte array for storage/serialization.
     *
     * @param map The Map to convert.
     *
     * @return A byte[] with the converted Map.
     *
     * @throws Exception A generic exception.
     */
	public static byte[] serializeMap(Map map)
            throws Exception
    {
        byte[] byteArray = null;

        for (Object value : map.values())
        {
            if (! (value instanceof Serializable))
            {
                throw new Exception("Could not serialize, value is not serializable:" + value);
            }
        }

        ByteArrayOutputStream baos = null;
        ObjectOutputStream out = null;
        try
        {
            // These objects are closed in the finally.
            baos = new ByteArrayOutputStream(1024);
            out  = new ObjectOutputStream(baos);

            out.writeObject(map);
            out.flush();

            byteArray = baos.toByteArray();
        }
        finally
        {
            if (out != null)
            {
                out.close();
            }
            if (baos != null)
            {
                baos.close();
            }
        }

        return byteArray;
    }

    /**
     * Deserializes a single object from an array of bytes.
     *
     * @param objectData The serialized object.
     *
     * @return The deserialized object, or null on failure.
     */
    @SuppressWarnings("unchecked")
    public static  T deserialize(byte[] objectData)
    {
        T object = null;

        if (objectData != null)
        {
            // These streams are closed in finally.
            ObjectInputStream in = null;
            ByteArrayInputStream bin = new ByteArrayInputStream(objectData);

            try
            {
                in = new ObjectInputStream(bin);

                // If objectData has not been initialized, an
                // exception will occur.
                object = (T)in.readObject();
            }
            catch (Exception e)
            {
                // ignore
            }
            finally
            {
                try
                {
                    if (in != null)
                    {
                        in.close();
                    }
                    bin.close();
                }
                catch (IOException e)
                {
                    // ignore
                }
            }
        }
        return object;
    }
}