/*
 * Copyright 2001-2008 The Apache Software Foundation.
 * 
 * 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.apache.juddi.config;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.util.Properties;

public class PersistenceManager {
    private static Log log = LogFactory.getLog(PersistenceManager.class);
    public static final String PERSISTENCE_UNIT_NAME = "juddiDatabase";
    private static EntityManagerFactory emf;

    public static EntityManager getEntityManager() {
        try {
            if (emf == null)
                AppConfig.getInstance();
        } catch (ConfigurationException e) {
            log.error("Error initializing config in PersistenceManager", e);
            throw new ExceptionInInitializerError(e);
        }

        return emf.createEntityManager();
    }

    public static void closeEntityManager() {
        if (emf.isOpen())
            emf.close();
    }

    protected static void initializeEntityManagerFactory(String persistenceUnitName) {
        try {
            if (emf == null) {
                Properties properties = new Properties();
                properties.put("openjpa.ConnectionURL", System.getProperty("uddi.openjpa.ConnectionURL"));
                emf = Persistence.createEntityManagerFactory(persistenceUnitName, properties);
            }
        } catch (Throwable t) {
            log.error("entityManagerFactory creation failed", t);
            throw new ExceptionInInitializerError(t);
        }
    }
}