/*
* $Id: ByteArrayToObject.java 19191 2010-08-25 21:05:23Z tcarlson $
* --------------------------------------------------------------------------------------
* Copyright (c) MuleSoft, Inc. All rights reserved. http://www.mulesoft.com
*
* The software in this package is published under the terms of the CPAL v1.0
* license, a copy of which has been included with this distribution in the
* LICENSE.txt file.
*/
package org.mule.transformer.simple;
import org.mule.api.transformer.TransformerException;
import org.mule.config.i18n.CoreMessages;
import org.mule.util.IOUtils;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectStreamConstants;
import java.io.PushbackInputStream;
import java.io.UnsupportedEncodingException;
/**
* <code>ByteArrayToObject</code> works in the same way as
* <code>ByteArrayToSerializable</code> but checks if the byte array is a
* serialised object and if not will return a String created from the bytes as the
* returnType on the transformer.
*/
public class ByteArrayToObject extends ByteArrayToSerializable
{
@Override
public Object doTransform(Object src, String encoding) throws TransformerException
{
if (src instanceof byte[])
{
byte[] bytes = (byte[])src;
if (this.checkStreamHeader(bytes[0]))
{
return super.doTransform(src, encoding);
}
else
{
try
{
return new String(bytes, encoding);
}
catch (UnsupportedEncodingException e)
{
throw new TransformerException(this, e);
}
}
}
else if (src instanceof InputStream)
{
try
{
PushbackInputStream pushbackStream = new PushbackInputStream((InputStream)src);
int firstByte = pushbackStream.read();
pushbackStream.unread((byte)firstByte);
if (this.checkStreamHeader((byte)firstByte))
{
return super.doTransform(pushbackStream, encoding);
}
else
{
try
{
return IOUtils.toString(pushbackStream, encoding);
}
finally
{
// this also closes the underlying stream that's stored in src
pushbackStream.close();
}
}
}
catch (IOException iox)
{
throw new TransformerException(this, iox);
}
}
else
{
throw new TransformerException(CoreMessages.transformOnObjectUnsupportedTypeOfEndpoint(
this.getName(), src.getClass(), endpoint));
}
}
private boolean checkStreamHeader(byte firstByte)
{
return (firstByte == (byte)((ObjectStreamConstants.STREAM_MAGIC >>> 8) & 0xFF));
}
}