public boolean canLoad(OWLOntologyDocumentSource documentSource) {
if (documentSource.isReaderAvailable()) {
return true;
}
if (documentSource.isInputStreamAvailable()) {
return true;
}
if (parsableSchemes.contains(documentSource.getDocumentIRI().getScheme())) {
return true;
}
// If we can open an input stream then we can attempt to parse the ontology
// TODO: Take into consideration the request type!
try {
InputStream is = documentSource.getDocumentIRI().toURI().toURL().openStream();
is.close();
return true;
} catch (UnknownHostException e) {
logger.info("Unknown host: " + e.getMessage());
} catch (MalformedURLException e) {
logger.info("Malformed URL: " + e.getMessage());
} catch (FileNotFoundException e) {
logger.info("File not found: " + e.getMessage());
} catch (IOException e) {
logger.info("IO Exception: " + e.getMessage());
}
return false;
}
public OWLOntology loadOWLOntology(
OWLOntologyDocumentSource documentSource, final OWLOntologyCreationHandler mediator)
throws OWLOntologyCreationException {
// Attempt to parse the ontology by looping through the parsers. If the
// ontology is parsed successfully then we break out and return the ontology.
// I think that this is more reliable than selecting a parser based on a file extension
// for example (perhaps the parser list could be ordered based on most likely parser, which
// could be determined by file extension).
Map<OWLParser, OWLParserException> exceptions =
new LinkedHashMap<OWLParser, OWLParserException>();
// Call the super method to create the ontology - this is needed, because
// we throw an exception if someone tries to create an ontology directly
OWLOntology existingOntology = null;
IRI iri = documentSource.getDocumentIRI();
if (getOWLOntologyManager().contains(iri)) {
existingOntology = getOWLOntologyManager().getOntology(iri);
}
OWLOntologyID ontologyID = new OWLOntologyID();
OWLOntology ont =
super.createOWLOntology(ontologyID, documentSource.getDocumentIRI(), mediator);
// Now parse the input into the empty ontology that we created
for (final OWLParser parser : getParsers()) {
try {
if (existingOntology == null && !ont.isEmpty()) {
// Junk from a previous parse. We should clear the ont
getOWLOntologyManager().removeOntology(ont);
ont = super.createOWLOntology(ontologyID, documentSource.getDocumentIRI(), mediator);
}
OWLOntologyFormat format = parser.parse(documentSource, ont);
mediator.setOntologyFormat(ont, format);
return ont;
} catch (IOException e) {
// No hope of any parsers working?
// First clean up
getOWLOntologyManager().removeOntology(ont);
throw new OWLOntologyCreationIOException(e);
} catch (UnloadableImportException e) {
// First clean up
getOWLOntologyManager().removeOntology(ont);
throw e;
} catch (OWLParserException e) {
// Record this attempts and continue trying to parse.
exceptions.put(parser, e);
} catch (RuntimeException e) {
// Clean up and rethrow
getOWLOntologyManager().removeOntology(ont);
throw e;
}
}
if (existingOntology == null) {
getOWLOntologyManager().removeOntology(ont);
}
// We haven't found a parser that could parse the ontology properly. Throw an
// exception whose message contains the stack traces from all of the parsers
// that we have tried.
throw new UnparsableOntologyException(documentSource.getDocumentIRI(), exceptions);
}
