/**
* Evaluates the SPARQL SELECT query from the specified query pair on the repository.
*
* @param query Query pair.
* @return Query result set.
* @throws RepositoryException If no connection could be established, or connection fails.
* @throws MalformedQueryException On query-related errors.
* @throws QueryEvaluationException On query-related errors.
*/
public SparqlResultSet query(QueryPair query)
throws RepositoryException, MalformedQueryException, QueryEvaluationException {
RepositoryConnection conn = repo.getConnection();
TupleQuery tq = conn.prepareTupleQuery(QueryLanguage.SPARQL, query.getSparqlQuery());
SparqlResultSet ret =
new SparqlResultSet(tq.evaluate(), query.getName(), query.getSparqlEntityIdVariables());
conn.close();
return ret;
}