package ejava.examples.cdiconfig.dao;
   
   import java.util.List;
   
   import javax.persistence.EntityManager;
   import javax.persistence.TypedQuery;
   
   import ejava.examples.cdiconfig.bo.Task;
   
  public class TasksDaoImpl implements TasksDao {
      private EntityManager em;
      
      public void setEntityManager(EntityManager em) {
          this.em = em;
      }
  
      @Override
      public void create(Task task) {
          em.persist(task);
      }
      
      @Override
      public Task getTask(int id) {
          return em.find(Task.class, id);
      }
  
      @Override
      public List<Task> getTasks(int offset, int limit) {
          TypedQuery<Task> query = em.createQuery("select t from Task t", Task.class);
          if (offset>0) { query.setFirstResult(offset); }
          if (limit>0) { query.setMaxResults(limit); }
          return query.getResultList();
      }
  
      @Override
      public void delete(Task task) {
          em.remove(task);
      }
  
  }