public Optional<Sort> build(List<RequestSort> requestSortList, FieldMapper fieldMapper) {
Iterator<RequestSort> iterator = requestSortList.iterator();
Sort sort = null;
if (iterator.hasNext()) {
RequestSort requestSort = iterator.next();
sort =
new Sort(
SORT_MAPPING.get(requestSort.getType()), fieldMapper.get(requestSort.getFieldName()));
}
while (iterator.hasNext()) {
RequestSort requestSort = iterator.next();
sort =
sort.and(
new Sort(
SORT_MAPPING.get(requestSort.getType()),
fieldMapper.get(requestSort.getFieldName())));
}
return Optional.ofNullable(sort);
}
public Optional<Sort> build(List<RequestSort> requestSortList) {
return build(requestSortList, FieldMapper.of(Maps.<String, String>newHashMap()));
}