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