Github user ejwhite922 commented on a diff in the pull request:
https://github.com/apache/incubator-rya/pull/218#discussion_r135882345
--- Diff:
sail/src/main/java/org/apache/rya/rdftriplestore/inference/InferenceEngine.java
---
@@ -405,6 +382,30 @@ public void refreshGraph() throws
InferenceEngineException {
}
/**
+ * Query for and collect all instances of a given type. Should only be
called for types expected
+ * to have few members, such as ontology vocabulary terms, as
instances will be collected in
+ * memory.
+ */
+ private Set<URI> fetchInstances(final URI type) throws
QueryEvaluationException {
+ final Set<URI> instances = new HashSet<>();
+ CloseableIteration<Statement, QueryEvaluationException> iter =
RyaDAOHelper.query(
+ ryaDAO, null, RDF.TYPE, type, conf);
+ try {
+ while (iter.hasNext()) {
+ final Statement st = iter.next();
+ if (st.getSubject() instanceof URI) {
+ instances.add((URI) st.getSubject());
+ }
+ }
+ } finally {
+ if (iter != null) {
+ iter.close();
+ }
+ }
--- End diff --
This can be reduced to:
```
ryaDaoQueryWrapper.queryAll(null, RDF.TYPE, type, new
RDFHandlerBase() {
@Override
public void handleStatement(final Statement st) throws
RDFHandlerException {
if (st.getSubject() instanceof URI) {
instances.add((URI) st.getSubject());
}
}
});
```
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