Hi,
I have to export a database into a XML file. As the objects contain BLOBs, I
implemented a Converter
for BLOBs:
public void marshal(Object source, HierarchicalStreamWriter writer,
MarshallingContext context) {
Blob blob = (Blob) source;
context.convertAnother(blob.getBytes(1, (int) blob.length()));
This will read the whole BLOB into a byte array and delegate to
EncodedByteArrayConverter. But the
BLOBs are much too large to fit into the heap. So I have to find a way to
stream this data (base64
encoded) into the output file.
However, I can not find any method in HierarchicalStreamWriter which would
allow to stream character
data.
As I already posted this question on the wrong list (dev instead of user,
sorry), I got the hint to
use Woodstox and its interface XMLStreamWriter2, which apparently would allow
to stream data. But I
have no idea, how I can get access to the underlying Woodstox writer inside of
a Converter.
In the above method, I can call "writer.underlyingWriter()", which returns an
instance of
StaxWriter. But this StaxWriter does not give access to its XMLStreamWriter.
How is it possible to stream data from a Converter into the output?
Regards,
Martin
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