How to convert a List of enity Object to Page Object in Spring Mvc Jpa?

Question

I have a List of entities. How do I convert it to Page Object using Spring MVC 4 and Spring Data JPA?

Answer 1

There is a Page implementation for that:

final Page<Something> page = new PageImpl<>(theListOfSomething);

Answer 2

There is one more Constructor :

Page<FOO> page = new PageImpl<>(listOfsomething, pageable, listOfsomething.size());

Answer 3

I think you will need to fetch the correct page content as well.

PageRequest pageRequest = PageRequest.of(offset, limit);

List<Product> products = getProducts();

int total = products.size();
int start = toIntExact(pageRequest.getOffset());
int end = Math.min((start + pageRequest.getPageSize()), total);

List<Product> output = new ArrayList<>();

if (start <= end) {
    output = products.subList(start, end);
}

return new PageImpl<>(
    output,
    pageRequest,
    total
);