On 16/05/13 04:21, Paul Tyson wrote:
Hi,
I'm trying to use the TDBLoader api to stream turtle to the bulk loader
to create a new TDB repository.
I suspect none of the TDBLoader.load*() methods accept turtle input. I'm
using version 2.10.1.
When the URL is given, they should pick up the language. If not, please
can we have a complete minimal example.
This sort of code produces an immediate RIOT exception:
InputStream is = ...;
Dataset ds = TDBFactory.createDataset("/tdb");
TDBLoader ldr = new TDBLoader();
ldr.loadGraph((GraphTDB) ds.getDefaultModel().getGraph(),is);
When reading from a stream, it does not know the syntax and, yes,
N-Triples expected.
(I am working from memory so I might not have the syntax quite right.)
It throws a RIOT exception on the first triple it sees, which is like:
<iri1> a <foo>; <p1> "str";...
Says it expected IRI instead of keyword "a".
Any pointers on how to stream turtle to TDBLoader? I do have control
over the RDF production, so could produce straight triples. But until
now I've been writing the RDF to ttl files, then loading with the
tdbloader command line.
Thanks,
--Paul
When streaming, you can feed through the turtle script to convert Turtle
to N-Triples
... files ... | turtle | tdbloader -- -
At scale, the extra cross-processes costs don't show any effect.
Parsing is not (usually) the dominate cost at scale.
If you are incrementally loading graphs into an existing store,
TDBLoader does not have any advantages. It's magic is when the store is
empty.
RDFDataMgr.read(in, ds.getDefaultModel(), Lang.TURTLE) ;
should be fine.
Andy
