And I see you wrote further with a solution. Gotta learn to scroll on my
android. :) Thanks! I will try this out.
On Feb 20, 2012 4:04 AM, "Jörg Schaible" <[email protected]>
wrote:
> Hi Michael,
>
> Michael Mogley wrote:
>
> > Ok, I modified the code to the following custom marshalling strategy. I
> > am able get the reference to the first object resolved, but not the
> > second. I.e:
> >
> > <typeA reference="../../../typeA[1]"/> works, but
> > <typeA reference="../,./../typeA[2]"/> gives invalid reference.
>
> Well, *this* reference *is* actually invalid. Do you recognize the ',' in
> the path?
>
> > public class ReusingReferenceByXPathMarshallingStrategy implements
> > MarshallingStrategy
> > {
> > //~ Instance fields
> > ----------------------------------------------------------
> >
> > private ReferenceByXPathMarshaller marshaller;
> > private ReferenceByXPathUnmarshaller unmarshaller;
> >
> > //~ Methods
> > ------------------------------------------------------------------
> >
> > @Override
> > public void marshal(HierarchicalStreamWriter writer, Object obj,
> > ConverterLookup converterLookup, Mapper mapper, DataHolder dataHolder)
> > {
> > if (marshaller == null)
> > {
> > marshaller = new ReferenceByXPathMarshaller(writer,
> converterLookup,
> > mapper, ReferenceByXPathMarshallingStrategy.RELATIVE);
> > }
> >
> > marshaller.start(obj, dataHolder);
> > }
> >
> > @Override
> > public Object unmarshal(Object root, HierarchicalStreamReader reader,
> > DataHolder dataHolder, ConverterLookup converterLookup, Mapper mapper)
> > {
> > if (unmarshaller == null)
> > {
> > unmarshaller = new ReferenceByXPathUnmarshaller(root, reader,
> > converterLookup, mapper);
> > }
> >
> > return unmarshaller.start(dataHolder);
> > }
> > }
>
> However, you're right, that the dereferencing fails here. The problem is,
> that in contrast to the IdMarshallingStrategy used originally in the
> example, the reference identifiers generated by the
> XPathMarshallingStrategy
> uses the absolute XPath. The path is tracked at unmarshalling time by
> wrapping moveDown/moveUp calls, but the mechanism fails, because the call
> of
> this method for the top level elements passes the wrapper.
>
> Therefore you will have to use your own path tracker and a modified copy of
> the ReferenceByXPathUnmarshaller:
>
> ================= %< ==============
> static class ReusingReferenceByXPathMarshallingStrategy implements
> MarshallingStrategy {
> private final static class ReusingReferenceByXPathUnmarshaller extends
> ReferenceByXPathUnmarshaller {
> private PathTracker pathTracker = new PathTracker();
>
> private ReusingReferenceByXPathUnmarshaller(Object root,
> HierarchicalStreamReader reader, ConverterLookup converterLookup, Mapper
> mapper) {
> super(root, reader, converterLookup, mapper);
> this.reader = new PathTrackingReader(reader, pathTracker);
> }
>
> private void initializeReuse(HierarchicalStreamReader reader) {
> pathTracker.popElement();
> pathTracker.pushElement(reader.getNodeName());
> }
>
> protected Object getReferenceKey(String reference) {
> final Path path = new Path(isNameEncoding ?
> ((AbstractReader)reader.underlyingReader()).decodeNode(reference) :
> reference);
> return reference.charAt(0) != '/' ? pathTracker.getPath().apply(path)
> : path;
> }
>
> protected Object getCurrentReferenceKey() {
> return pathTracker.getPath();
> }
> }
>
> private ReferenceByXPathMarshaller marshaller;
> private ReferenceByXPathUnmarshaller unmarshaller;
>
> public void marshal(HierarchicalStreamWriter writer, Object obj,
> ConverterLookup converterLookup, Mapper mapper, DataHolder dataHolder) {
> if (marshaller == null) {
> marshaller = new ReferenceByXPathMarshaller(writer, converterLookup,
> mapper, ReferenceByXPathMarshallingStrategy.RELATIVE |
> ReferenceByXPathMarshallingStrategy.SINGLE_NODE);
> }
> marshaller.start(obj, dataHolder);
> }
>
> public Object unmarshal(Object root, HierarchicalStreamReader reader,
> DataHolder dataHolder, ConverterLookup converterLookup, Mapper mapper) {
> if (unmarshaller == null) {
> unmarshaller = new ReusingReferenceByXPathUnmarshaller(root, reader,
> converterLookup, mapper);
> } else {
>
> ((ReusingReferenceByXPathUnmarshaller)unmarshaller).initializeReuse(reader);
> }
> return unmarshaller.start(dataHolder);
> }
> }
> ================= %< ==============
>
> Hope this helps now,
> Jörg
>
>
> ---------------------------------------------------------------------
> To unsubscribe from this list, please visit:
>
> http://xircles.codehaus.org/manage_email
>
>
>
