public static Object copyToStandardObject(
Object o, ObjectInspector oi, ObjectInspectorCopyOption objectInspectorOption) {
if (o == null) {
return null;
}
Object result = null;
switch (oi.getCategory()) {
case PRIMITIVE:
{
PrimitiveObjectInspector loi = (PrimitiveObjectInspector) oi;
if (objectInspectorOption == ObjectInspectorCopyOption.DEFAULT) {
objectInspectorOption =
loi.preferWritable()
? ObjectInspectorCopyOption.WRITABLE
: ObjectInspectorCopyOption.JAVA;
}
switch (objectInspectorOption) {
case JAVA:
result = loi.getPrimitiveJavaObject(o);
if (loi.getPrimitiveCategory()
== PrimitiveObjectInspector.PrimitiveCategory.TIMESTAMP) {
result =
PrimitiveObjectInspectorFactory.javaTimestampObjectInspector.copyObject(result);
}
break;
case WRITABLE:
result = loi.getPrimitiveWritableObject(loi.copyObject(o));
break;
}
break;
}
case LIST:
{
ListObjectInspector loi = (ListObjectInspector) oi;
int length = loi.getListLength(o);
ArrayList<Object> list = new ArrayList<Object>(length);
for (int i = 0; i < length; i++) {
list.add(
copyToStandardObject(
loi.getListElement(o, i),
loi.getListElementObjectInspector(),
objectInspectorOption));
}
result = list;
break;
}
case MAP:
{
MapObjectInspector moi = (MapObjectInspector) oi;
HashMap<Object, Object> map = new HashMap<Object, Object>();
Map<? extends Object, ? extends Object> omap = moi.getMap(o);
for (Map.Entry<? extends Object, ? extends Object> entry : omap.entrySet()) {
map.put(
copyToStandardObject(
entry.getKey(), moi.getMapKeyObjectInspector(), objectInspectorOption),
copyToStandardObject(
entry.getValue(), moi.getMapValueObjectInspector(), objectInspectorOption));
}
result = map;
break;
}
case STRUCT:
{
StructObjectInspector soi = (StructObjectInspector) oi;
List<? extends StructField> fields = soi.getAllStructFieldRefs();
ArrayList<Object> struct = new ArrayList<Object>(fields.size());
for (StructField f : fields) {
struct.add(
copyToStandardObject(
soi.getStructFieldData(o, f),
f.getFieldObjectInspector(),
objectInspectorOption));
}
result = struct;
break;
}
case UNION:
{
UnionObjectInspector uoi = (UnionObjectInspector) oi;
List<ObjectInspector> objectInspectors = uoi.getObjectInspectors();
Object object =
copyToStandardObject(
uoi.getField(o), objectInspectors.get(uoi.getTag(o)), objectInspectorOption);
result = object;
break;
}
default:
{
throw new RuntimeException("Unknown ObjectInspector category!");
}
}
return result;
}
