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Common library for MmsParams system

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package cz.mmsparams.api.utils;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class ByteUtil
{
    private ByteUtil()
    {
    }

    public static boolean isEmptyOrNull(byte[] bytes)
    {
        return (bytes == null || bytes.length == 0);
    }

    // toByteArray and toObject are taken from: http://tinyurl.com/69h8l7x
    public static byte[] toByteArray(Object obj) throws IOException
    {
        byte[] bytes = null;
        ByteArrayOutputStream bos = null;
        ObjectOutputStream oos = null;
        try
        {
            bos = new ByteArrayOutputStream();
            oos = new ObjectOutputStream(bos);
            oos.writeObject(obj);
            oos.flush();
            bytes = bos.toByteArray();
        }
        finally
        {
            if (oos != null)
            {
                oos.close();
            }
            if (bos != null)
            {
                bos.close();
            }
        }
        return bytes;
    }

    public static Object toObject(byte[] bytes) throws IOException, ClassNotFoundException
    {
        Object obj = null;
        ByteArrayInputStream bis = null;
        ObjectInputStream ois = null;
        try
        {
            bis = new ByteArrayInputStream(bytes);
            ois = new ObjectInputStream(bis);
            obj = ois.readObject();
        }
        finally
        {
            if (bis != null)
            {
                bis.close();
            }
            if (ois != null)
            {
                ois.close();
            }
        }
        return obj;
    }

    public static String toString(byte[] bytes)
    {
        return new String(bytes);
    }
}