eu.jangos.realm.controller.auth.RealmService.java Source code

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Here is the source code for eu.jangos.realm.controller.auth.RealmService.java

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package eu.jangos.realm.controller.auth;

/*
 * Copyright 2016 Talendrys.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import eu.jangos.realm.hibernate.HibernateUtil;
import eu.jangos.realm.model.auth.Realm;
import java.util.List;
import org.hibernate.FetchMode;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.criterion.Restrictions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * RealmService is an abstraction layer to interact with Realm entities.
 * @author Warkdev
 * @version v0.1 BETA.
 */
public class RealmService {
    private static final Logger logger = LoggerFactory.getLogger(RealmService.class);

    /**
     * Provides all realms stored in the database.
     * @return A List of Realms corresponding to all realms stored in the database.
     */
    public List<Realm> getAllRealms() {
        logger.debug("Returning all realms");
        try (Session session = HibernateUtil.getAuthSession().openSession()) {
            return session.createCriteria(Realm.class).list();
        } catch (HibernateException he) {
            logger.debug("Issue while connecting to the database.");
        }
        return null;
    }

    /**
     * Provides the record for the realm with the given name.
     * @param name The name of the realm to be found.
     * @return A Realm object corresponding to the realm with the provided name. Null if the realm is not found.
     */
    public Realm getRealmByName(String name) {
        if (name == null || name.isEmpty()) {
            logger.error("The parameter name is null or empty");
            return null;
        }

        logger.debug("Returning realm with the name " + name);

        try (Session session = HibernateUtil.getAuthSession().openSession()) {
            return (Realm) session.createCriteria(Realm.class).setFetchMode("realmtype", FetchMode.JOIN)
                    .setFetchMode("realmtimezone", FetchMode.JOIN).add(Restrictions.like("name", name))
                    .uniqueResult();
        } catch (HibernateException he) {
            logger.debug("Issue while connecting to the database.");
        }
        return null;
    }

    /**
     * Save the realm provided in parameters.
     * @param realm The realm record to be saved.
     * @return The persisted Realm object.
     */
    public Realm save(Realm realm) {
        logger.debug("Saving realm " + realm.getName());

        try (Session session = HibernateUtil.getAuthSession().openSession()) {
            session.beginTransaction();
            Realm r = (Realm) session.merge(realm);
            session.flush();
            session.getTransaction().commit();
            return r;
        } catch (HibernateException he) {
            logger.debug("Issue while connecting to the database to save realm " + realm.getName());
        }

        return null;
    }
}