On 26/04/12 15:21, Crapo, Andrew (GE Global Research) wrote:
I’m trying out TDB as a triple store. I’m not sure if this is a bug or a
misunderstanding. I have the following JUnit test code:
Which version?
I don't think the sync bug affects this example, but if you could run
the current development version where it's fixes, that would be great.
Otherwise, can this be turned into a test case I might be able to run?
All the OWL and specifics of the data are unlikely to be related.
Andy
*private**static*String /assetFN/= "assetcore.owl";
*private**static*String /locoFN/= "locomotive.owl";
*private**static*String /evolutionFN/= "evolution.owl";
*private**static*String /es44c4FN/= "es44c4.owl";
...
Dataset ds = *null*;
File tdbDir = *new*File(/tdbFolder/);
*if*(!tdbDir.exists()) {
ds = TDBFactory./createDataset/(/tdbFolder/);
ds.addNamedModel(/assetUri/, loadModel(/blueprintsFolder/+
File./separator/+ /assetFN/));
ds.addNamedModel(/locoUri/, loadModel(/blueprintsFolder/+
File./separator/+ /locoFN/));
ds.addNamedModel(/evolutionUri/, loadModel(/blueprintsFolder/+
File./separator/+ /evolutionFN/));
ds.addNamedModel(/es44c4Uri/, loadModel(/blueprintsFolder/+
File./separator/+ /es44c4FN/));
}
*else*{
ds = TDBFactory./createDataset/(/tdbFolder/);
}
Iterator<String> mniter = ds.listNames();
*while*(mniter.hasNext()) {
System./out/.println("TDB repository contains model '"+ mniter.next() +
"'");
}
ds.close();
When I run it the first time it works as I expected, listing the four
OWL models that I have added to the repository. However, if I run it a
second time, now that the tdbFolder exists, I get a null pointer
exception in the call to mniter.hasNext(). The Dataset (ds) created from
an existing TDB folder doesn’t appear to be a valid Dataset. Am I doing
something wrong?
The loadModel method is as follows:
*private*OntModel loadModel(String owlFilename) *throws*IOException {
OntModel model = ModelFactory./createOntologyModel/(OntModelSpec./OWL_MEM/);
OntDocumentManager docMgr = model.getDocumentManager();
docMgr.setProcessImports(*false*); // we don't want to do the import
yet, just load the model
File modelFile = *new*File(owlFilename);
InputStream is = *new*FileInputStream(modelFile);
BufferedReader in = *new*BufferedReader(*new*InputStreamReader(is));
String base = *null*;
RDFReader reader = model.getReader();
reader.read(model, is, base);
in.close();
*return*model;
}
*Andrew Crapo*
Information Scientist
GE Global Research
T +1 518 387 5729
F +1 518 387 6104
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E cr...@research.ge.com
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