/******************************************************************************
* JBoss, a division of Red Hat *
* Copyright 2010, Red Hat Middleware, LLC, and individual *
* contributors as indicated by the @authors tag. See the *
* copyright.txt in the distribution for a full listing of *
* individual contributors. *
* *
* This is free software; you can redistribute it and/or modify it *
* under the terms of the GNU Lesser General Public License as *
* published by the Free Software Foundation; either version 2.1 of *
* the License, or (at your option) any later version. *
* *
* This software 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 *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this software; if not, write to the Free *
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA *
* 02110-1301 USA, or see the FSF site: http://www.fsf.org. *
******************************************************************************/
package org.gatein.exports.data;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.UnsupportedEncodingException;
/**
* @author <a href="mailto:mwringe@redhat.com">Matt Wringe</a>
* @version $Revision$
*/
public abstract class ExportData
{
public abstract double getVersion();
public abstract String getType();
protected abstract byte[] internalEncodeAsBytes() throws UnsupportedEncodingException, IOException;
//The encoding used to create the byte array
protected static final String ENCODING = "UTF-8";
protected static final String SEPARATOR = "_@_";
public byte[] encodeAsBytes() throws IOException
{
byte[] internalBytes = internalEncodeAsBytes();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeUTF(this.getType());
oos.writeDouble(this.getVersion());
if (internalBytes != null)
{
oos.write(internalBytes);
}
oos.close();
return baos.toByteArray();
}
public static double getVersion(byte[] bytes) throws IOException
{
if (bytes != null && bytes.length > 0)
{
ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
ObjectInputStream ois = new ObjectInputStream(bais);
String type = ois.readUTF();
Double version = ois.readDouble();
return version.doubleValue();
}
else
{
return -1;
}
}
public static String getType(byte[] bytes) throws IOException
{
if (bytes != null && bytes.length > 0)
{
ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
ObjectInputStream ois = new ObjectInputStream(bais);
return ois.readUTF();
}
else
{
return null;
}
}
public static byte[] getInternalBytes(byte[] bytes) throws IOException
{
if (bytes != null && bytes.length > 0)
{
ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
ObjectInputStream ois = new ObjectInputStream(bais);
String type = ois.readUTF();
Double version = ois.readDouble();
byte[] internalBytes = null;
if (ois.available() > 0)
{
internalBytes = new byte[ois.available()];
ois.readFully(internalBytes);
}
return internalBytes;
}
else
{
return null;
}
}
}