/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This 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 2.1 of
* the License, or (at your option) any later version.
*
* This software 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 this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jbpm.db.hibernate;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;
import org.jbpm.util.ClassLoaderUtil;
public class HibernateHelper {
private HibernateHelper() {
// prevent instantiation
}
/** maps SessionFactory's to Configurations.
* by default, configuration lookup will be enabled */
static Map configurations = new HashMap();
public static void clearConfigurationsCache() {
configurations.clear();
}
public static SessionFactory createSessionFactory() {
return createSessionFactory(null, null, true);
}
public static SessionFactory createSessionFactory(String cfgXmlResource) {
return createSessionFactory(cfgXmlResource, null, true);
}
public static SessionFactory createSessionFactory(String cfgXmlResource, String propertiesResource) {
return createSessionFactory(cfgXmlResource, propertiesResource, true);
}
public static SessionFactory createSessionFactory(String cfgXmlResource,
String propertiesResource, boolean isConfigLookupEnabled) {
Configuration configuration = createConfiguration(cfgXmlResource, propertiesResource);
return createSessionFactory(configuration, isConfigLookupEnabled);
}
public static SessionFactory createSessionFactory(Configuration configuration,
boolean isConfigLookupEnabled) {
SessionFactory sessionFactory = configuration.buildSessionFactory();
if (isConfigLookupEnabled) {
configurations.put(sessionFactory, configuration);
}
return sessionFactory;
}
public static Configuration createConfiguration(String cfgXmlResource, String propertiesResource) {
Configuration configuration = new Configuration();
// if a special hibernate configuration xml file is specified,
if (cfgXmlResource != null) {
// use the configured file name
URL cfgURL = Thread.currentThread().getContextClassLoader().getResource(cfgXmlResource);
log.debug("creating hibernate configuration resource '" + cfgURL + "'");
configuration.configure(cfgXmlResource);
} else {
log.debug("using default hibernate configuration resource (hibernate.cfg.xml)");
configuration.configure();
}
// if the properties are specified in a separate file
if (propertiesResource != null) {
log.debug("using hibernate properties from resource '" + propertiesResource + "'");
// load the properties
Properties properties = loadPropertiesFromResource(propertiesResource);
if (!properties.isEmpty()) {
// and overwrite the properties with the specified properties
configuration.setProperties(properties);
}
}
return configuration;
}
public static Configuration getConfiguration(SessionFactory sessionFactory) {
return (Configuration) configurations.get(sessionFactory);
}
public static SchemaExport createSchemaExport(SessionFactory sessionFactory) {
return new SchemaExport(getConfiguration(sessionFactory));
}
public static boolean createSchemaExportScript(SessionFactory sessionFactory) {
boolean script = false;
String showSql = getConfiguration(sessionFactory).getProperty("hibernate.show_sql");
if ("true".equalsIgnoreCase(showSql)) {
script = true;
}
return script;
}
public static void clearHibernateCache(SessionFactory sessionFactory) {
sessionFactory.evictQueries();
Map classMetadata = sessionFactory.getAllClassMetadata();
Iterator iter = classMetadata.keySet().iterator();
while (iter.hasNext()) {
String entityName = (String) iter.next();
sessionFactory.evictEntity(entityName);
}
Map collectionMetadata = sessionFactory.getAllCollectionMetadata();
iter = collectionMetadata.keySet().iterator();
while (iter.hasNext()) {
String collectionName = (String) iter.next();
sessionFactory.evictCollection(collectionName);
}
}
static Properties loadPropertiesFromResource(String resource) {
Properties properties = new Properties();
InputStream inputStream = ClassLoaderUtil.getStream(resource);
if (inputStream != null) {
try {
properties.load(inputStream);
} catch (IOException e) {
log.warn("couldn't load hibernate properties from resource '" + resource + "'", e);
}
} else {
log.warn("hibernate properties resource '" + resource + "' not found");
}
return properties;
}
private static Log log = LogFactory.getLog(HibernateHelper.class);
}