protected List<DatabaseObject> mergeDatabaseObjects(List<DatabaseObject> objects) {
int maxIdx = -1;
for (DatabaseObject object : objects) {
maxIdx = Math.max(maxIdx, object.getOrder());
}
final List<DatabaseObject> orderedObjects = createListAndFillNull(maxIdx);
final List<DatabaseObject> unorderedObjects = new ArrayList<>();
final List<DatabaseObject> mergedObjects = new ArrayList<>();
for (DatabaseObject object : objects) {
if (object.getOrder() > -1) {
int objIdx = object.getOrder();
if (objIdx < orderedObjects.size() && orderedObjects.get(objIdx) != null) {
throw new TajoInternalError(
"This catalog configuration contains duplicated order of DatabaseObject");
}
orderedObjects.add(objIdx, object);
} else {
unorderedObjects.add(object);
}
}
for (DatabaseObject object : orderedObjects) {
if (object != null) {
mergedObjects.add(object);
}
}
for (DatabaseObject object : unorderedObjects) {
if (object != null) {
mergedObjects.add(object);
}
}
return mergedObjects;
}
