private ObjectInspectorConverters.Converter getConverter(ObjectInspector arg) {
switch (arg.getCategory()) {
case PRIMITIVE:
return ObjectInspectorConverters.getConverter(arg, arg);
case LIST:
case MAP:
case STRUCT:
return ObjectInspectorConverters.getConverter(arg, solveOi(arg));
default:
return null;
}
}
public static ConstantObjectInspector getConstantObjectInspector(
ObjectInspector oi, Object value) {
if (oi instanceof ConstantObjectInspector) {
return (ConstantObjectInspector) oi;
}
ObjectInspector writableOI = getStandardObjectInspector(oi, ObjectInspectorCopyOption.WRITABLE);
Object writableValue = ObjectInspectorConverters.getConverter(oi, writableOI).convert(value);
switch (writableOI.getCategory()) {
case PRIMITIVE:
PrimitiveObjectInspector poi = (PrimitiveObjectInspector) oi;
return PrimitiveObjectInspectorFactory.getPrimitiveWritableConstantObjectInspector(
poi.getTypeInfo(), writableValue);
case LIST:
ListObjectInspector loi = (ListObjectInspector) oi;
return ObjectInspectorFactory.getStandardConstantListObjectInspector(
getStandardObjectInspector(
loi.getListElementObjectInspector(), ObjectInspectorCopyOption.WRITABLE),
(List<?>) writableValue);
case MAP:
MapObjectInspector moi = (MapObjectInspector) oi;
return ObjectInspectorFactory.getStandardConstantMapObjectInspector(
getStandardObjectInspector(
moi.getMapKeyObjectInspector(), ObjectInspectorCopyOption.WRITABLE),
getStandardObjectInspector(
moi.getMapValueObjectInspector(), ObjectInspectorCopyOption.WRITABLE),
(Map<?, ?>) writableValue);
default:
throw new IllegalArgumentException(
writableOI.getCategory() + " not yet supported for constant OI");
}
}