public Iterable<Entity> getEdges() {
MetaIterator<Entity> meta = null;
for (Node pred : getProperties()) {
Iterable<Entity> it = get(pred);
if (meta == null) meta = new MetaIterator<Entity>(it);
else meta.next(it);
}
return meta;
}
Iterable<Entity> getNodes() {
MetaIterator<Entity> meta = null;
for (NodeTable gt : graph.values()) {
if (meta == null) meta = new MetaIterator<Entity>(gt.values());
else meta.next(gt.values());
}
if (meta == null) return new ArrayList<Entity>();
return meta;
}