SettingDao.java

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

import java.util.logging.Level;

import javax.ejb.Stateless;
import javax.persistence.NoResultException;
import javax.persistence.TypedQuery;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Root;

import de.romankreisel.faktotum.datamodel.SettingEntity;
import de.romankreisel.faktotum.datamodel.SettingEntity_;

/**
 * The Data Access Object for the SettingEntity
 * 
 * @author Roman Kreisel <mail@romankreisel.de>
 */
@SuppressWarnings("rawtypes")
@Stateless
public class SettingDao extends JpaDao<SettingEntity> {

	/**
	 * Returns the setting from the DB or null if not found.
	 * 
	 * @param identifier
	 * @return
	 */
	public SettingEntity getSetting(String identifier) {
		CriteriaBuilder criteriaBuilder = this.getCriteriaBuilder();
		CriteriaQuery<SettingEntity> criteriaQuery = criteriaBuilder.createQuery(SettingEntity.class);

		Root<SettingEntity> entityRoot = criteriaQuery.from(SettingEntity.class);
		criteriaQuery.where(criteriaBuilder.equal(entityRoot.get(SettingEntity_.identifier), identifier));
		TypedQuery<SettingEntity> typedQuery = this.createQuery(criteriaQuery);
		try {
			SettingEntity searchResult = typedQuery.getSingleResult();
			return searchResult;
		} catch (NoResultException e) {
			this.getLogger().log(Level.FINE, "Setting " + identifier + " not in DB", e);
		}
		return null;
	}
}