EntityUtils.java 文件源码

public static Property<Serializable> getVersionProperty(Class<?> entityClass)
{
    List<PropertyCriteria> criteriaList = new LinkedList<PropertyCriteria>();
    criteriaList.add(new AnnotatedPropertyCriteria(Version.class));

    String fromMappingFiles = PersistenceUnitDescriptorProvider.getInstance().versionField(entityClass);
    if (fromMappingFiles != null)
    {
        criteriaList.add(new NamedPropertyCriteria(fromMappingFiles));
    }

    for (PropertyCriteria criteria : criteriaList)
    {
        PropertyQuery<Serializable> query =
            PropertyQueries.<Serializable> createQuery(entityClass).addCriteria(criteria);
        Property<Serializable> result = query.getFirstResult();
        if (result != null)
        {
            return result;
        }
    }

    return null;
}