@SuppressWarnings("unchecked")
private <T> Map<String, T> getPrivateField(String field) {
try {
Field f = builder.getClass().getDeclaredField(field);
f.setAccessible(true);
return copyObject((Map<String, T>) f.get(builder));
} catch (NoSuchFieldException | IllegalAccessException e) {
throw new RuntimeException("Couldn't get " + field + " from TopologyBuilder", e);
}
}
