csns.model.academics.dao.jpa.CourseDaoImpl.java Source code

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Here is the source code for csns.model.academics.dao.jpa.CourseDaoImpl.java

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/*
 * This file is part of the CSNetwork Services (CSNS) project.
 * 
 * Copyright 2012-2014, Chengyu Sun (csun@calstatela.edu).
 * 
 * CSNS is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Affero General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option)
 * any later version.
 * 
 * CSNS is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
 * more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with CSNS. If not, see http://www.gnu.org/licenses/agpl.html.
 */
package csns.model.academics.dao.jpa;

import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.TypedQuery;

import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

import csns.model.academics.Course;
import csns.model.academics.dao.CourseDao;

@Repository
public class CourseDaoImpl implements CourseDao {

    @PersistenceContext
    private EntityManager entityManager;

    @Override
    public Course getCourse(Long id) {
        return entityManager.find(Course.class, id);
    }

    @Override
    public Course getCourse(String code) {
        List<Course> courses = entityManager.createQuery("from Course where code = :code", Course.class)
                .setParameter("code", code.toUpperCase()).getResultList();
        return courses.size() == 0 ? null : courses.get(0);
    }

    @Override
    public List<Course> searchCourses(String term, int maxResults) {
        TypedQuery<Course> query = entityManager.createNamedQuery("course.search", Course.class);
        if (maxResults > 0)
            query.setMaxResults(maxResults);
        return query.setParameter("term", term).getResultList();
    }

    @Override
    @Transactional
    @PreAuthorize("principal.admin or principal.id == #course.coordinator.id")
    public Course saveCourse(Course course) {
        return entityManager.merge(course);
    }

}