如何将谓词列表添加到 CriteriaBuilder.or

Question

I have a List to append in an or condition

The Issue I am facing is when I am iterating over the List and adding it to the CategoryBuilder then it takes the last Predicate

Following is the example:

public static Specification<Billoflading> hasTenantAndBillingCodeCombination(List<WhoOwnsIt> list,
            Date formattedFromDate, Date formattedToDate, String carrierFilter, String supplierFilter,
            String terminalFilter) {
        return (root, query, cb) -> {
            List<Predicate> predicates = new ArrayList<>();

            for (WhoOwnsIt whoOwnsIt : list) {
                String containsLikePatternForTenant = getContainsLikePattern(whoOwnsIt.getWholesalerTenantID(), true);

                Predicate pred = cb.and(cb.like(cb.lower(root.<String>get("tenant")), containsLikePatternForTenant),
                        cb.equal(cb.lower(root.<String>get("billingCode")), whoOwnsIt.getBillingCode()),
                        cb.greaterThanOrEqualTo(root.<Date>get("scheduleDate"), formattedFromDate),
                        cb.lessThanOrEqualTo(root.<Date>get("scheduleDate"), formattedToDate));

                Predicate predWithTenant = null;

                if (null != carrierFilter) {
                    predWithTenant = cb.and(cb.equal(cb.lower(root.<String>get("tenant")), carrierFilter));
                }

                if (null != predWithTenant)
                    predicates.add(predWithTenant);
                else
                    predicates.add(pred);

            }
            Predicate finalPredicate;
            // This commented section below needs to be replaced with a 
            //better solution
            //for(Predicate predicate : predicates){
            //  cb.or(predicate);
            //}

            return finalPredicate;
        };
    }

I also tried making the List an array for passing it to the finalPredicate.or as follows

Predicate finalQuery = cb.or(predicates.toArray());

But this code gave compilation error as the parameters needed is varargs ie

or method accepts (Predicate... predicates) as parameter list

Can you please provide some simple solution to this issue?

Answer 1

尝试这个：

Predicate finalQuery = cb.or(predicates.toArray(new Predicate[0]));

Answer 2

作为补充，我建议对较新的 Java 版本使用以下表示法：

builder.or(predicates.toArray(Predicate[]::new))

Answer 3

A sample code I wrote that might be helpful, here am gathering all predicates in a list and then converted list to array which is getting consumed by builder.

 public List< EntityClass> getData(List<Long> ids) {

    List<List<Long>> idPartitions = ListUtils.partition(ids, 999);
    CriteriaBuilder builder = entityManager.getCriteriaBuilder();
    CriteriaQuery<EntityClass> criteria = builder.createQuery(EntityClass.class);

    Root<EntityClass> root = criteria.from(EntityClass.class);

    List<Predicate> predicates = new ArrayList<>(idPartitions.size());
    for (List<Long> idPartition : idPartitions) {
      predicates.add(root.get("id").in(idPartition));
    }

    criteria.where(builder.and(predicates.toArray(new Predicate[0])));
    List<EntityClass> objects = entityManager.createQuery(criteria).getResultList();
    return objects;
  }