fi.helsinki.opintoni.repository.CommonRepository.java Source code

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Here is the source code for fi.helsinki.opintoni.repository.CommonRepository.java

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/*
 * This file is part of MystudiesMyteaching application.
 *
 * MystudiesMyteaching application is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * MystudiesMyteaching application 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with MystudiesMyteaching application.  If not, see <http://www.gnu.org/licenses/>.
 */

package fi.helsinki.opintoni.repository;

import org.springframework.stereotype.Component;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;
import java.util.List;

@Component
public class CommonRepository {

    @PersistenceContext
    private EntityManager entityManager;

    public <T> T find(Class<T> entityClass, Long id) {
        return entityManager.find(entityClass, id);
    }

    public <T> List<T> find(Class<T> entityClass, List<Long> ids) {
        CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder();
        CriteriaQuery<T> query = criteriaBuilder.createQuery(entityClass);
        Root<T> from = query.from(entityClass);
        query.select(from).where(from.get("id").in(ids));
        return entityManager.createQuery(query).getResultList();
    }

}