LectureFacade.java
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/*
* Copyright Codecrew Ry
*
* All rights reserved.
*
* This license applies to any software containing a notice placed by the
* copyright holder. Such software is herein referred to as the Software.
* This license covers modification, distribution and use of the Software.
*
* Any distribution and use in source and binary forms, with or without
* modification is not permitted without explicit written permission from the
* copyright owner.
*
* A non-exclusive royalty-free right is granted to the copyright owner of the
* Software to use, modify and distribute all modifications to the Software in
* future versions of the Software.
*
*/
package fi.codecrew.moya.facade;
import javax.ejb.EJB;
import javax.ejb.LocalBean;
import javax.ejb.Stateless;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;
import fi.codecrew.moya.beans.EventBean;
import fi.codecrew.moya.model.Lecture;
import fi.codecrew.moya.model.LectureGroup_;
import fi.codecrew.moya.model.Lecture_;
@Stateless
@LocalBean
public class LectureFacade extends IntegerPkGenericFacade<Lecture> {
public LectureFacade() {
super(Lecture.class);
}
@EJB
EventBean eventbean;
public Lecture findFirstLecture() {
CriteriaBuilder cb = getEm().getCriteriaBuilder();
CriteriaQuery<Lecture> cq = cb.createQuery(Lecture.class);
Root<Lecture> root = cq.from(Lecture.class);
cq.where(cb.equal(root.get(Lecture_.lectureGroup).get(LectureGroup_.event), eventbean.getCurrentEvent()));
cq.orderBy(cb.asc(root.get(Lecture_.startTime)));
return getSingleNullableResult(getEm().createQuery(cq).setMaxResults(1));
}
}