@Override
public Fields serialize(final Object o) {
if (!set.contains(o.getClass())) throw new IllegalArgumentException();
final Fields f = new Fields();
if (o instanceof Collection) {
final Collection<?> c = ((Collection<?>) o);
f.putObject("values", c.toArray());
} else if (o instanceof Map) {
final Map<?, ?> m = ((Map<?, ?>) o);
f.putObject("keys", m.keySet().toArray());
f.putObject("values", m.values().toArray());
}
assert f.size() > 0 : o;
return f;
}
