private Object toJsonCompatible(Object value) {
if (value instanceof Node) {
final Node node = (Node) value;
final Map<String, Object> result = SubGraph.toMap((PropertyContainer) node);
result.put("_id", node.getId());
final List<String> labelNames = SubGraph.getLabelNames(node);
if (!labelNames.isEmpty()) result.put("_labels", labelNames);
return result;
}
if (value instanceof Relationship) {
final Relationship relationship = (Relationship) value;
final Map<String, Object> result = SubGraph.toMap((PropertyContainer) relationship);
result.put("_id", relationship.getId());
result.put("_start", relationship.getStartNode().getId());
result.put("_end", relationship.getEndNode().getId());
result.put("_type", relationship.getType().name());
return result;
}
if (value instanceof Map) {
@SuppressWarnings("unchecked")
Map<String, Object> map = (Map<String, Object>) value;
final Map<String, Object> result = new LinkedHashMap<>(map.size());
for (Map.Entry<String, Object> entry : map.entrySet()) {
result.put(entry.getKey(), toJsonCompatible(entry.getValue()));
}
return result;
}
if (value instanceof Iterable) {
final List<Object> result = new ArrayList<>();
for (Object inner : (Iterable) value) {
result.add(toJsonCompatible(inner));
}
return result;
}
return value;
}