RolePermissionDAO.java 文件源码

/**
 * retrieves the <code>RolesPermission</code> by the role.
 * 
 * @param role
 *            the role
 * @return userPermissions the list of permissions of the user
 * 
 */
public static Set<String> getPermission(String role) {
    EntityManagerFactory emf = Persistence.createEntityManagerFactory("userData");
    EntityManager em = emf.createEntityManager();
    EntityTransaction tx = em.getTransaction();
    tx.begin();
    CriteriaBuilder cb = em.getCriteriaBuilder();
    CriteriaQuery<RolePermission> q = cb.createQuery(RolePermission.class);
    Root<RolePermission> c = q.from(RolePermission.class);
    q.select(c).where(cb.equal(c.get("roleName"), role));
    TypedQuery<RolePermission> query = em.createQuery(q);
    List<RolePermission> permissions = query.getResultList();
    Set<String> userPermissions = new HashSet<String>();
    for (RolePermission permission : permissions)
        userPermissions.add(permission.getPermission());
    tx.commit();
    em.close();
    return userPermissions;
}