private static Object getReferencedId(DataRecord next, ReferenceFieldMetadata field) {
DataRecord record = (DataRecord) next.get(field);
if (record != null) {
Collection<FieldMetadata> keyFields = record.getType().getKeyFields();
if (keyFields.size() == 1) {
return record.get(keyFields.iterator().next());
} else {
List<Object> compositeKeyValues = new ArrayList<Object>(keyFields.size());
for (FieldMetadata keyField : keyFields) {
compositeKeyValues.add(record.get(keyField));
}
return compositeKeyValues;
}
} else {
return StringUtils.EMPTY;
}
}
