private static Object mapValue(Object v) {
if ((v == null)
|| v instanceof Number
|| v instanceof Boolean
|| v instanceof Character
|| v instanceof String
|| v instanceof DTO) {
return v;
}
if (v instanceof Map) {
Map<?, ?> m = (Map<?, ?>) v;
Map<Object, Object> map = newMap(m.size());
for (Map.Entry<?, ?> e : m.entrySet()) {
map.put(mapValue(e.getKey()), mapValue(e.getValue()));
}
return map;
}
if (v instanceof List) {
List<?> c = (List<?>) v;
List<Object> list = newList(c.size());
for (Object o : c) {
list.add(mapValue(o));
}
return list;
}
if (v instanceof Set) {
Set<?> c = (Set<?>) v;
Set<Object> set = newSet(c.size());
for (Object o : c) {
set.add(mapValue(o));
}
return set;
}
if (v.getClass().isArray()) {
final int length = Array.getLength(v);
final Class<?> componentType = mapComponentType(v.getClass().getComponentType());
Object array = Array.newInstance(componentType, length);
for (int i = 0; i < length; i++) {
Array.set(array, i, mapValue(Array.get(v, i)));
}
return array;
}
return String.valueOf(v);
}
/**
* Assumes the input map always has String keys and the values are of types: String, Version,
* Long, Double or List of the previous types. Lists are copied and Version objects are converted
* to String objects.
*/
private static Map<String, Object> newAttributesMapDTO(Map<String, Object> map) {
Map<String, Object> dto = new HashMap<String, Object>(map);
/* Lists are copied and Version objects are converted to String objects. */
for (Map.Entry<String, Object> entry : dto.entrySet()) {
Object value = entry.getValue();
if (value instanceof Version) {
entry.setValue(String.valueOf(value));
continue;
}
if (value instanceof List) {
List<Object> newList = new ArrayList<Object>((List<?>) value);
for (ListIterator<Object> iter = newList.listIterator(); iter.hasNext(); ) {
Object element = iter.next();
if (element instanceof Version) {
iter.set(String.valueOf(element));
}
}
entry.setValue(newList);
continue;
}
}
return dto;
}