public List<Object> getValues(PrestoField field) {
FieldDefinition fieldDefinition =
FieldDefinition.getFieldDefinition(
session.getTopicById(field.getId()), session.getTopicMap());
Collection<? extends Object> fieldValues = fieldDefinition.getValues(topic);
List<Object> result = new ArrayList<Object>(fieldValues.size());
if (fieldDefinition.getFieldType() == FieldDefinition.FIELD_TYPE_ROLE
&& ((RoleField) fieldDefinition).getAssociationField().getArity() == 1) {
result.add(!fieldValues.isEmpty());
} else {
for (Object value : fieldValues) {
result.add(normalizeValue(topic, fieldDefinition, value));
}
}
return result;
}