CodeSystemDao.java 文件源码

@Override
@Transactional
public CodeSystemEntity findBySystem(String system) {

    CriteriaBuilder builder = em.getCriteriaBuilder();

    CodeSystemEntity codeSystemEntity = null;
    CriteriaQuery<CodeSystemEntity> criteria = builder.createQuery(CodeSystemEntity.class);

    Root<CodeSystemEntity> root = criteria.from(CodeSystemEntity.class);
    List<Predicate> predList = new LinkedList<Predicate>();
    log.trace("FlushMode = "+em.getFlushMode());
    log.trace("Entity Manager Properties = "+ em.getProperties().toString());
    Predicate p = builder.equal(root.<String>get("codeSystemUri"),system);
    predList.add(p);
    Predicate[] predArray = new Predicate[predList.size()];
    predList.toArray(predArray);
    if (predList.size()>0)
    {
        log.trace("Found CodeSystem "+system);
        criteria.select(root).where(predArray);

        List<CodeSystemEntity> qryResults = em.createQuery(criteria).getResultList();

        for (CodeSystemEntity cme : qryResults) {
            codeSystemEntity = cme;
            break;
        }
    }
    if (codeSystemEntity == null) {
        log.info("Not found adding CodeSystem = "+system);
        codeSystemEntity = new CodeSystemEntity();
        codeSystemEntity.setCodeSystemUri(system);

        save(codeSystemEntity);

    }
    return codeSystemEntity;
}