How to stream XML data using XOM?

Question

Say I want to output a huge set of search results, as XML, into a PrintWriter or an OutputStream, using XOM. The resulting XML would look like this:

Answer 1

I ran in to the same issue, but found it's pretty simple to do what you mentioned as an option and subclass Serializer as follows:

public class StreamSerializer extends Serializer {

    public StreamSerializer(OutputStream out) {
        super(out);
    }

    @Override
    public void write(Element element) throws IOException {
        super.write(element);
    }

    @Override
    public void writeXMLDeclaration() throws IOException {
        super.writeXMLDeclaration();
    }

    @Override
    public void writeEndTag(Element element) throws IOException {
        super.writeEndTag(element);
    }

    @Override
    public void writeStartTag(Element element) throws IOException {
        super.writeStartTag(element);
    }

}

Then you can still take advantage of the various XOM config like setIdent, etc. but use it like this:

Element rootElement = new Element("resultset");
StreamSerializer serializer = new StreamSerializer(out);
serializer.setIndent(4);
serializer.writeXMLDeclaration();
serializer.writeStartTag(rootElement);
while(hasNextElement()) {
    serializer.write(nextElement());
}
serializer.writeEndTag(rootElement);
serializer.flush();