Hi Steve,
On 08/06/11 22:00, Steve Kearns wrote:
I tried sending this once before subscribing to the list, so my
apologies if this arrives twice.
No problem.
It seems that the underlying graph of a TDB-backed named model
doesn't support the RenameResource function in ResourceUtils. I get
an UnsupportedOperationException when I try to use this, though the
exception seems to come from the WrappedIterator/NiceIterator not
supporting the remove.
Are there known workarounds for this case, or should I implement my
own renameResource that uses DELETE SPARQL queries to do the
removes?
This issue seems like a cousin of:
http://tech.groups.yahoo.com/group/jena-dev/message/35431
Yes :-|
The concept of iterator.delete just does not work very well -- sometimes
the TDB because the
Stack trace:
java.lang.UnsupportedOperationException at
com.hp.hpl.jena.util.iterator.WrappedIterator.remove(WrappedIterator.java:76)
at
com.hp.hpl.jena.util.iterator.NiceIterator$1.remove(NiceIterator.java:109)
at
com.hp.hpl.jena.util.iterator.WrappedIterator.remove(WrappedIterator.java:77)
at
com.hp.hpl.jena.util.iterator.FilterIterator.remove(FilterIterator.java:65)
at
com.hp.hpl.jena.util.ResourceUtils.renameResource(ResourceUtils.java:270)
at
com.basistech.jug.rdfdb.task.RdfGenerator.mergeEntities(RdfGenerator.java:271)
at
com.basistech.jug.rdfdb.RdfGeneratorTest.testMergeEntities(RdfGeneratorTest.java:156)
Versions: Jena 2.6.4 TDB 0.8.10
I also tried Jena 2.6.5-SNAPSHOT as of June 6, 2011, for kicks. The
stacktrace is slightly different, due to a rewrite of RenameResource,
but the result is the same UnsupportedOperationException.
Thanks for reporting that.
I'm at SemTech and not able to hack code in any meaningful way for the
next few days.
I'll look at it ASAP.
If it's helpful, I can pack up a unit test to demonstrate that
renameResource fails for a TDB-backed model, but works fine on a
model created by ModelFactory.createDefaultModel().
Thanks, Steve
