@Override
protected boolean ask(final String askQuery)
throws RepositoryException, MalformedQueryException, QueryEvaluationException {
final BooleanQuery q = connection.prepareBooleanQuery(QueryLanguage.SPARQL, askQuery);
final boolean result = q.evaluate();
return result;
}
public void booleanQuery()
throws QueryEvaluationException, RepositoryException, MalformedQueryException {
// /query repo
String queryString =
"PREFIX : \n<http://it.unibz.krdb/obda/ontologies/test/translation/onto2.owl#>\n "
+ "ASK { :Lisa a :Person} ";
BooleanQuery boolQuery = (con).prepareBooleanQuery(QueryLanguage.SPARQL, queryString);
boolean result = boolQuery.evaluate();
System.out.println(result);
}
public static BooleanQuery getQuery(
RepositoryConnection connection,
ParsedBooleanQuery booleanQueryModel,
boolean includeInferred) {
try {
QUERY_HOLDER.set(booleanQueryModel);
BooleanQuery booleanQuery = connection.prepareBooleanQuery(DirectQuery.DIRECTQUERY, "");
booleanQuery.setIncludeInferred(includeInferred);
return booleanQuery;
} catch (MalformedQueryException e) {
throw new RepositoryException(e);
} catch (org.openrdf.repository.RepositoryException e) {
throw new RepositoryException(e);
}
}
public String query(String queryString)
throws RepositoryException, MalformedQueryException, QueryEvaluationException,
TupleQueryResultHandlerException, RDFHandlerException, IOException {
ByteArrayOutputStream bout = new ByteArrayOutputStream();
RepositoryConnection con = getRepository().getConnection();
SPARQLParser parser = new SPARQLParser();
ParsedQuery parsedQuery = parser.parseQuery(queryString, null);
if (parsedQuery instanceof ParsedTupleQuery) {
SPARQLResultsXMLWriter writer = new SPARQLResultsXMLWriter(bout);
TupleQuery query = con.prepareTupleQuery(QueryLanguage.SPARQL, queryString);
query.evaluate(writer);
} else if (parsedQuery instanceof ParsedGraphQuery) {
RDFXMLPrettyWriter writer = new RDFXMLPrettyWriter(bout);
GraphQuery query = con.prepareGraphQuery(QueryLanguage.SPARQL, queryString);
query.evaluate(writer);
} else if (parsedQuery instanceof ParsedBooleanQuery) {
BooleanQuery query = con.prepareBooleanQuery(QueryLanguage.SPARQL, queryString);
boolean result = query.evaluate();
String resultString = BOOLEAN_RESULT_RESULT_PREFIX + result + BOOLEAN_RESULT_RESULT_SUFFIX;
bout.write(resultString.getBytes());
}
con.close();
return bout.toString();
}
