@Override
public Object make(
HGPersistentHandle handle, LazyRef<HGHandle[]> targetSet, IncidenceSetRef incidenceSet) {
HGHandle[] layout = graph.getStore().getLink(handle);
ArrayList<Z> contravar = graph.get(layout[0]);
ArrayList<Z> covar = graph.get(layout[1]);
S fac = graph.get(layout[2]);
Map<ArrayList<BigInteger>, R> map = graph.get(layout[3]);
if (contravar == null) throw (new RuntimeException("Failed"));
if (covar == null) throw (new RuntimeException("Failed"));
if (fac == null) throw (new RuntimeException("Failed"));
if (map == null) throw (new RuntimeException("Failed"));
final EinsteinTensorElem<Z, R, S> et = new EinsteinTensorElem<Z, R, S>(fac, contravar, covar);
for (final Entry<ArrayList<BigInteger>, R> ii : map.entrySet()) {
ArrayList<BigInteger> key = ii.getKey();
R val = ii.getValue();
et.setVal(key, val);
}
return (et);
}
