private static boolean isGrounded(Triple triple) {
if (triple.getSubject() instanceof BlankNode) {
return false;
}
if (triple.getObject() instanceof BlankNode) {
return false;
}
return true;
}
// called withiong write-lock
private void removeExistingRequiredReadPermissions(IRI GraphUri, Graph permissionMGraph) {
try {
Triple t = permissionMGraph.filter(GraphUri, readPermissionListProperty, null).next();
RDFTerm list = t.getObject();
removeList((BlankNodeOrIRI) list, permissionMGraph);
permissionMGraph.remove(t);
} catch (NoSuchElementException e) {
// There was no existing to remove
}
}
private void readList(BlankNodeOrIRI list, Graph permissionMGraph, LinkedList<String> target) {
if (list.equals(rdfNil)) {
return;
}
Triple restTriple = permissionMGraph.filter(list, rest, null).next();
BlankNodeOrIRI restList = (BlankNodeOrIRI) restTriple.getObject();
readList(restList, permissionMGraph, target);
Triple firstTriple = permissionMGraph.filter(list, first, null).next();
Literal firstValue = (Literal) firstTriple.getObject();
String value = LiteralFactory.getInstance().createObject(String.class, firstValue);
target.addFirst(value);
}
static Set<BlankNode> getBNodes(Collection<Triple> s) {
Set<BlankNode> result = new HashSet<BlankNode>();
for (Triple triple : s) {
if (triple.getSubject() instanceof BlankNode) {
result.add((BlankNode) triple.getSubject());
}
if (triple.getObject() instanceof BlankNode) {
result.add((BlankNode) triple.getObject());
}
}
return result;
}
private void removeList(BlankNodeOrIRI list, Graph permissionMGraph) {
try {
Triple t = permissionMGraph.filter(list, rest, null).next();
RDFTerm restList = t.getObject();
removeList((BlankNodeOrIRI) restList, permissionMGraph);
permissionMGraph.remove(t);
Iterator<Triple> iter = permissionMGraph.filter(list, first, null);
iter.next();
iter.remove();
} catch (NoSuchElementException e) {
// if it has no rest its rdf:NIL and has no first
}
}
private Collection<String> getRequiredPermissionStrings(final IRI GraphUri, IRI property) {
try {
final Graph permissionMGraph = tcManager.getMGraph(permissionGraphName);
Lock l = permissionMGraph.getLock().readLock();
l.lock();
try {
Triple t = permissionMGraph.filter(GraphUri, property, null).next();
BlankNodeOrIRI list = (BlankNodeOrIRI) t.getObject();
LinkedList<String> result = new LinkedList<String>();
readList(list, permissionMGraph, result);
return result;
} catch (NoSuchElementException e) {
return new ArrayList<String>(0);
} finally {
l.unlock();
}
} catch (NoSuchEntityException e) {
return new ArrayList<String>(0);
}
}
