NewsGroupFacade.java

package fi.insomnia.bortal.facade;

import java.util.List;

import javax.ejb.EJB;
import javax.ejb.LocalBean;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;

import fi.insomnia.bortal.beans.EventBeanLocal;
import fi.insomnia.bortal.model.NewsGroup;
import fi.insomnia.bortal.model.NewsGroup_;

@Stateless
@LocalBean
public class NewsGroupFacade extends GenericFacade<Integer, NewsGroup> {

	@PersistenceContext
	private EntityManager em;

	public NewsGroupFacade() {
		super(NewsGroup.class);
	}

	@Override
	protected EntityManager getEm() {
		return em;
	}

	@EJB
	private EventBeanLocal eventbean;

	public NewsGroup findByName(String name) {

		CriteriaBuilder cb = em.getCriteriaBuilder();
		CriteriaQuery<NewsGroup> cq = cb.createQuery(NewsGroup.class);
		Root<NewsGroup> root = cq.from(NewsGroup.class);
		cq.where(cb.equal(root.get(NewsGroup_.event), eventbean.getCurrentEvent()),
				cb.equal(root.get(NewsGroup_.name), name)
				);

		NewsGroup ret = getSingleNullableResult(em.createQuery(cq));
		if (ret == null) {
			ret = new NewsGroup(eventbean.getCurrentEvent());
			ret.setName(name);
			this.create(ret);
		}
		return ret;
	}

	public List<NewsGroup> findNews() {
		CriteriaBuilder cb = em.getCriteriaBuilder();
		CriteriaQuery<NewsGroup> cq = cb.createQuery(NewsGroup.class);
		Root<NewsGroup> root = cq.from(NewsGroup.class);
		cq.where(cb.equal(root.get(NewsGroup_.event), eventbean.getCurrentEvent()));
		return em.createQuery(cq).getResultList();

	}
}