On 15/07/14 11:06, Julien Plu wrote:
Ok, I finally succeed to do it ! Here the method that I've found :
DatasetGraph dg = RDFDataMgr.loadDatasetGraph(PrivacyDeployment.FILE,
Lang.NQUADS);
Iterator<Node> nodeIt = dg.listGraphNodes();
while (nodeIt.hasNext()) {
Node node = nodeIt.next();
Graph graph = dg.getGraph(node);
VirtGraph virtGraph = new VirtGraph(node.getURI(),
PrivacyDeployment.DB_URL, PrivacyDeployment.USER, PrivacyDeployment.PASS);
for (Triple triple : GraphUtil.findAll(graph).toSet()) {
virtGraph.add(triple);
}
virtGraph.close();
}
But is-there a simpler way to do it ?
Yiou should be able to read it straight into the Virtuoso Dataset
DatasetGraph
VirtDataset vd = new VirtDataset(...)
RDFDataMgr.read(vd, Lang.NQUADS) ;
It only depends on the Dataset interface (well, DatasetGraph actually,
it'll internally take off the Dataset to get at the quads interface to
storage).
Andy
Best.
-------------------------------------------------------------------------------------------------------------------------------
Julien Plu
PhD Student at Eurecom.
Personal webpage: http://jplu.developpez.com
FOAF file : http://jplu.developpez.com/julien
Email address : [email protected]
Phone : +33493008200
Twitter : @julienplu
2014-07-15 11:22 GMT+02:00 Julien Plu <[email protected]>:
Hi Andy,
After trying what you told me, I'm able now to load a file with quads. But
now it's impossible to copy the content from one Dataset to another one,
here what I'm trying to do :
VirtDataset vd = new VirtDataset("jdbc:virtuoso://localhost:1111", "dba",
"dba");
DatasetGraph vdg = vd.asDatasetGraph();
DatasetGraph dg = RDFDataMgr.loadDatasetGraph("data.nq", Lang.NQUADS);
Iterator<Node> nodeIt = dg.listGraphNodes();
while (nodeIt.hasNext()) {
Node node = nodeIt.next();
Graph graph = dg.getGraph(node);
vdg.addGraph(node, graph);
}
RDFDataMgr.write(System.out, vdg, RDFFormat.NQUADS_UTF8);
When I try to write the final DatasetGraph, I have this exception :
Exception in thread "main" java.lang.UnsupportedOperationException:
subject cannot be null
at com.hp.hpl.jena.graph.Triple.<init>(Triple.java:38)
at
virtuoso.jena.driver.VirtDataset$VirtDataSetGraph.find(VirtDataset.java:497)
at org.apache.jena.riot.writer.NQuadsWriter.write(NQuadsWriter.java:91)
at org.apache.jena.riot.RDFDataMgr.write$(RDFDataMgr.java:1274)
at org.apache.jena.riot.RDFDataMgr.write(RDFDataMgr.java:1148)
at
fr.eurecom.cixty.privacytest.PrivacyDeployment.addData(PrivacyDeployment.java:265)
at
fr.eurecom.cixty.privacytest.PrivacyDeployment.main(PrivacyDeployment.java:81)
I also tried this code :
VirtDataset vd = new VirtDataset("jdbc:virtuoso://localhost:1111", "dba",
"dba");
RDFDataMgr.read(vd.asDatasetGraph(),
Files.newInputStream(Paths.get("data.nq")), Lang.NQUADS);
But the same exception occurs.
Anything I did wrongly ?
Best.
-------------------------------------------------------------------------------------------------------------------------------
Julien Plu
PhD Student at Eurecom.
Personal webpage: http://jplu.developpez.com
FOAF file : http://jplu.developpez.com/julien
Email address : [email protected]
Phone : +33493008200
Twitter : @julienplu
2014-07-13 2:34 GMT+02:00 Julien Plu <[email protected]>
:
Ok thank you !
I will try with a dataset now.
-------------------------------------------------------------------------------------------------------------------------------
Julien Plu
PhD Student at Eurecom.
Personal webpage: http://jplu.developpez.com
FOAF file : http://jplu.developpez.com/julien
Email address : [email protected]
Phone : +33493008200
Twitter : @julienplu
2014-07-12 19:48 GMT+02:00 Andy Seaborne <[email protected]>:
On 11/07/14 15:31, Julien Plu wrote:
Hi,
I try to read a N-QUAD file to load it in a model but unfortunalety
nothing
is loaded. Here what I do :
Model m = RDFDataMgr.loadModel("data.nq", Lang.NQUADS);
RDFDataMgr.write(System.out, m, RDFFormat.NQUADS_UTF8);
At the end nothing is displayed on the console. And I have just one line
inside my file :
<http://example.com/Toto> <http://xmlns.com/foaf/0.1/name> "Toto" <
http://example.com> .
Do-I something wrong ? Or is-there another way to do that ?
Thanks in advance for your answer.
Best.
Julien.
A model is a single graph. It can't hold named graphs.
If you read N-quads (default and named graphs) into a Model (a single
graph) only the default graph goes into the model.
Use a dataset to get the set of all graphs in the n-quads files.
Andy
