JPA 分页 条件 查询

public Page<ReportTask> getListByPage(ReportTaskQueryDto reportTaskQueryDto) {
        final Integer offset = reportTaskQueryDto.getOffset();
        final Integer limit = reportTaskQueryDto.getLimit();
        Sort sort = Sort.sort(ReportTask.class).by(ReportTask::getCreateTime).descending();
        PageRequest pageRequest = PageRequest.of(offset, limit, sort);
        Specification<ReportTask> specification = (root, query, criteriaBuilder) -> {
            Predicate predicate = criteriaBuilder.conjunction();
            List<Expression<Boolean>> expressions = predicate.getExpressions();
            if (!Objects.isNull(reportTaskQueryDto.getTaskName())) {
                expressions.add(criteriaBuilder.like(root.get("taskName"), "%" + reportTaskQueryDto.getTaskName() + "%"));
            }
            if (!Objects.isNull(reportTaskQueryDto.getStatus())) {
                expressions.add(criteriaBuilder.equal(root.get("status"), reportTaskQueryDto.getStatus()));
            }
            return predicate;
        };

        return reportTaskRepository.findAll(specification, pageRequest);
    }