public <T, V> Query<T> find(
String kind, Class<T> clazz, String property, V value, int offset, int size) {
Query<T> query = find(kind, clazz);
query.offset(offset);
query.limit(size);
return query.filter(property, value);
}
public List<User> findWithLimitAndOffset(int limit, int offset, String sortField) {
Query<User> findQuery = ds.createQuery(User.class);
if (limit > 0) {
findQuery = findQuery.limit(limit);
}
if (offset > 0) {
findQuery = findQuery.offset(offset);
}
if (null != sortField) {
findQuery = findQuery.order(sortField);
}
if (null == findQuery) {
return null;
}
List<User> users = findQuery.asList();
return (users.isEmpty()) ? null : users;
}