OMSource does Axiom -> SAX and the transformer will do SAX -> DOM. I
guess that the default transformer implementation is smart enough to
do that without going through another object model (or
serialization/deserialization step). Since SAX is just a sequence of
method calls, this means that no intermediate representation of the
XML will be created.
Andreas
On Thu, Mar 12, 2009 at 12:19, Xavier Drudis Ferran
<xdru...@ambarinformatica.com> wrote:
>
> I've tried axiom-1.2.8 and OMSource, and works fine. (Andreas alternative #2).
>
> Unless I misunderstood something, this alternative does not
> need a copy of the XML text in memory for the SAML assertion in
> addition of the DOM tree, only the DOM tree for it (else I wouldn't
> be able to use OpenSAML, I think). Not sure if the TransformerFactory
> is heavier enough to warrant a ThreadLocal, though. I think the transformer
> should go in the ThreadLocal ,not only the factory.
>
> new imports:
> import org.w3c.dom.Document;
> import javax.xml.transform.Transformer;
> import javax.xml.transform.TransformerConfigurationException;
> import javax.xml.transform.TransformerException;
> import javax.xml.transform.TransformerFactory;
> import javax.xml.transform.dom.DOMResult;
> import org.apache.axiom.om.impl.jaxp.OMSource;
>
> new code:
>
> private static final ThreadLocal<TransformerFactory> transFac = new
> ThreadLocal<TransformerFactory>() {
> @Override
> protected TransformerFactory initialValue() {
> return TransformerFactory.newInstance();
> }
> };
>
> public boolean assercioValida(OMElement assercio) {
>
> OMSource source = new OMSource(assercio);
> Element assercioSAMLDOM = null;
> Transformer transformer;
> try {
> transformer = transFac.get().newTransformer();
> DOMResult result = new DOMResult();
> transformer.transform(source, result);
> assercioSAMLDOM =
> ((Document)result.getNode()).getDocumentElement();
>
> logger.debug("obteained assertion DOM \"on the fly\"");
>
> } catch (TransformerConfigurationException e2) {
> logger.error(e2,e2);
> } catch (TransformerException e) {
> logger.error(e,e);
> }
>
> try {
> if (assercioSAMLDOM==null) {
> // worse solution, generates and parses XML (bytearray) but works
> with axiom-1.2.7
> assercioSAMLDOM = XMLUtils.toDOM(assercio);
> logger.debug("obtained assertion DOM through XML (overhead)");
> [...] Unmarshalling unchanged, as before
> }
> [...]
> }
>
>
>
>
> --
> Xavi Drudis Ferran
> xdru...@ambarinformatica.com
>
