private void connectRelation(InternalRelation r) {
for (int i = 0; i < r.getLen(); i++) {
boolean success = r.getVertex(i).addRelation(r);
if (!success) throw new AssertionError("Could not connect relation: " + r);
}
addedRelations.add(r);
if (isVertexIndexProperty(r)) newVertexIndexEntries.add((TitanProperty) r);
}
