Apply filter on Page objects

Question

I'm building an API that accepts for my "/search" request multiple parameters so that I can filter results with findAll(Example<T> example) . In the second stage I filter non trivial types ( Date ) to narrow down my results, which works fine.

The problem now arises where I want to implement pagination. Spring data offers the findAll(Example<T> example, Pageable page) method, which creates a Page<T> element for me, which is no more applicable to my filtering mechanisms. Though Page<T> offers a .filter(Predicate p) function, this converts my Page to a Streamable, which is not what I need for pagination.

How can I further filter a Page<T> object without ending up with a unintended data format?

Answer 1

I solved the issue by first filtering my result set without the pagination information, and later applying the submitted pagination parameters.

int startIndex = page * size;
int endIndex = (startIndex + size) > myList.size() ? myList.size() : (startIndex + size);
JsonPage<>(myList.subList(startIndex, endIndex), PageRequest.of(page, size), myList.size());

That is way more intuitive than creating the page object and unpack it to get the filterable objects.