org.apache.shindig.social.opensocial.hibernate.utils.HibernateUtils.java Source code

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Here is the source code for org.apache.shindig.social.opensocial.hibernate.utils.HibernateUtils.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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.apache.shindig.social.opensocial.hibernate.utils;

import java.io.File;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;

public class HibernateUtils {

    private static Log logger = LogFactory.getLog(HibernateUtils.class);

    private static SessionFactory sessionFactory;

    private static final ThreadLocal<Session> sessionThreadLocal = new ThreadLocal<Session>();

    public static final String configFileName = "osde_hibernate.cfg.xml";

    public static final String configFileDir;

    static {
        File home = new File(System.getProperty("user.home"));
        File osdeDir = new File(home, ".osde");
        osdeDir.mkdir();
        configFileDir = osdeDir.getAbsolutePath();
    }

    private HibernateUtils() {
    }

    public static void initialize() throws HibernateException {
        init(new File(configFileDir, configFileName));
    }

    public static void initialize(String resource) throws HibernateException {
        init(resource);
    }

    private static void init(String resource) throws HibernateException {
        try {
            if (resource != null && !resource.equals("")) {
                sessionFactory = new AnnotationConfiguration().configure(resource).buildSessionFactory();
            } else {
                sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();
            }
        } catch (Exception e) {
            throw new HibernateException("Can't build hibernate sessionactory.", e);
        }
    }

    private static void init(File configFile) throws HibernateException {
        try {
            if (configFile != null) {
                sessionFactory = new AnnotationConfiguration().configure(configFile).buildSessionFactory();
            } else {
                sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();
            }
        } catch (Exception e) {
            throw new HibernateException("Can't build hibernate sessionactory.", e);
        }
    }

    public static Session currentSession() throws HibernateException {
        if (sessionFactory == null) {
            initialize();
        }
        Session session = (Session) sessionThreadLocal.get();
        if (session == null) {
            logger.debug("Open Hibernate Session.");
            session = sessionFactory.openSession();
            sessionThreadLocal.set(session);
        }
        return session;
    }

    public static void closeSession() throws HibernateException {
        if (sessionFactory == null || sessionThreadLocal == null) {
            return;
        }
        Session session = sessionThreadLocal.get();
        sessionThreadLocal.set(null);
        if (session != null) {
            logger.debug("Close Hibernate Session.");
            session.close();
        }
    }

}