/*
 * Copyright 2016 the original author or authors.
 *
 * 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.
 */
package org.glowroot.agent.plugin.hibernate;

import org.hibernate.MappingException;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

class HibernateUtil {

    private static SessionFactory sessionFactory;

    static {
        try {
            sessionFactory = createSessionFactory();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    static SessionFactory getSessionFactory() {
        return sessionFactory;
    }

    private static SessionFactory createSessionFactory() throws Exception {
        Configuration configuration;
        try {
            configuration = new Configuration().configure();
        } catch (MappingException e) {
            // hibernate prior to 3.6.0
            Class<?> cfgClass = Class.forName("org.hibernate.cfg.AnnotationConfiguration");
            configuration = ((Configuration) cfgClass.newInstance()).configure();
        }
        return configuration.buildSessionFactory();
    }
}
