Example usage for javax.persistence PersistenceUnitUtil isLoaded

Introduction

In this page you can find the example usage for javax.persistence PersistenceUnitUtil isLoaded.

Prototype

public boolean isLoaded(Object entity, String attributeName);

Source Link

Document

Determine the load state of a given persistent attribute of an entity belonging to the persistence unit.

Usage

From source file:org.jdal.dao.jpa.JpaUtils.java

/**
 * Initialize a entity. /* w ww  .j a v a 2s. c om*/
 * @param em entity manager to use
 * @param entity entity to initialize
 * @param depth max depth on recursion
 */
@SuppressWarnings({ "rawtypes", "unchecked" })
public static void initialize(EntityManager em, Object entity, int depth) {
    // return on nulls, depth = 0 or already initialized objects
    if (entity == null || depth == 0) {
        return;
    }

    PersistenceUnitUtil unitUtil = em.getEntityManagerFactory().getPersistenceUnitUtil();
    EntityType entityType = em.getMetamodel().entity(entity.getClass());
    Set<Attribute> attributes = entityType.getDeclaredAttributes();

    Object id = unitUtil.getIdentifier(entity);

    if (id != null) {
        Object attached = em.find(entity.getClass(), unitUtil.getIdentifier(entity));

        for (Attribute a : attributes) {
            if (!unitUtil.isLoaded(entity, a.getName())) {
                if (a.isCollection()) {
                    intializeCollection(em, entity, attached, a, depth);
                } else if (a.isAssociation()) {
                    intialize(em, entity, attached, a, depth);
                }
            }
        }
    }
}

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