Data-Centric Applications with Vaadin 8

Preparing the backend services

Let's start, then, by adding a parameter for the ordering configuration to the find method of the CallRepository in the example application:

public static List<Call> find(int offset, int limit,        String filter, Map<String, Boolean> order) {    return JPAService.runInTransaction(em -> {        String jpql = "select c from Call c where lower(c.client) like :filter or c.phoneNumber like :filter or lower(c.city) like :filter" + buildOrderByClause(sort);        Query query = em.createQuery(jpql);        query.setParameter("filter", "%" + filter.trim().toLowerCase() + "%");        query.setFirstResult(offset);        query.setMaxResults(limit);        List<Call> resultList = query.getResultList();        return resultList;    });}

The order parameter contains the name of ...