/**
    * 
    */
   package de.tivsource.page.dao.administration;
   
   import java.util.List;
   
   import javax.ejb.Stateless;
   import javax.persistence.EntityManager;
  import javax.persistence.NoResultException;
  import javax.persistence.PersistenceContext;
  import javax.persistence.Query;
  
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  
  import de.tivsource.page.entity.administration.User;
  
  /**
   * @author Marc Michele
   *
   */
  @Stateless
  public class UserDao implements UserDaoLocal {
  
      /*
       * Statischer Logger der Klasse.
       */
      private static final Logger LOGGER = LogManager.getLogger(UserDao.class);
  
      /*
       * EntityManager der Dao Klasse.
       */
      @PersistenceContext
      private EntityManager entityManager;
  
      /* (non-Javadoc)
       * @see de.tivsource.page.dao.administration.UserDaoLocal#save(de.tivsource.page.entity.administration.User)
       */
      @Override
      public void save(User user) {
          LOGGER.info("save(User user) aufgerufen");
          entityManager.persist(user);
      }
  
      /* (non-Javadoc)
       * @see de.tivsource.page.dao.administration.UserDaoLocal#merge(de.tivsource.page.entity.administration.User)
       */
      @Override
      public void merge(User user) {
          LOGGER.info("merge(User user) aufgerufen");
          entityManager.merge(user);
      }
  
      /* (non-Javadoc)
       * @see de.tivsource.page.dao.administration.UserDaoLocal#delete(de.tivsource.page.entity.administration.User)
       */
      @Override
      public void delete(User user) {
          entityManager.remove(entityManager.find(User.class, user.getUuid()));
      }
  
      /* (non-Javadoc)
       * @see de.tivsource.page.dao.administration.UserDaoLocal#findByUsername(java.lang.String)
       */
      @Override
      public User findByUsername(String username) {
          LOGGER.info("findByUsername(String username) aufgerufen.");
          try {
              Query query = entityManager.createQuery("select u from User u where u.username = :username");
              query.setParameter("username", username);
              return (User)query.getSingleResult();
          } catch(NoResultException e) {
          	return null;
          }
      }
  
      @Override
      public User findByUuid(String uuid) {
          return entityManager.find(User.class, uuid);
      }
  
      /* (non-Javadoc)
       * @see de.tivsource.page.dao.administration.UserDaoLocal#findAll(java.lang.Integer, java.lang.Integer)
       */
      @Override
      @SuppressWarnings("unchecked")
      public List<User> findAll(Integer start, Integer max) {
          Query query = entityManager.createQuery("from User u");
          query.setFirstResult(start);
          query.setMaxResults(max);
          return query.getResultList();
      }
  
      @Override
      @SuppressWarnings("unchecked")
      public List<User> findAll(Integer start, Integer max, String field,
              String order) {
          String queryString = "select u from User u order by ";
         queryString = queryString + field + " " + order;
         Query query = entityManager.createQuery(queryString);
         query.setFirstResult(start);
         query.setMaxResults(max);
         return query.getResultList();
     }
 
     /* (non-Javadoc)
      * @see de.tivsource.page.dao.administration.UserDaoLocal#countAll()
      */
     @Override
     public Integer countAll() {
         Query query = entityManager.createQuery("Select Count(u) from User u");
         return Integer.parseInt(query.getSingleResult().toString());
     }
 
 }// Ende class