/**
* Redistribution and use of this software and associated documentation
* ("Software"), with or without modification, are permitted provided
* that the following conditions are met:
*
* 1. Redistributions of source code must retain copyright
* statements and notices. Redistributions must also contain a
* copy of this document.
*
* 2. Redistributions in binary form must reproduce the
* above copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* 3. The name "Exolab" must not be used to endorse or promote
* products derived from this Software without prior written
* permission of Intalio, Inc. For written permission,
* please contact info@exolab.org.
*
* 4. Products derived from this Software may not be called "Exolab"
* nor may "Exolab" appear in their names without prior written
* permission of Intalio, Inc. Exolab is a registered
* trademark of Intalio, Inc.
*
* 5. Due credit should be given to the Exolab Project
* (http://www.exolab.org/).
*
* THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
* NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* INTALIO, INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Copyright 1999 (C) Intalio, Inc. All Rights Reserved.
*
* $Id: JDOConfLoader.java,v 1.5 2004/10/05 22:19:57 wguttmann Exp $
*/
package org.exolab.castor.jdo.engine;
import org.exolab.castor.jdo.conf.Database;
import org.exolab.castor.jdo.conf.JdoConf;
import org.exolab.castor.jdo.conf.Mapping;
import org.exolab.castor.jdo.conf.TransactionDemarcation;
import org.exolab.castor.mapping.MappingException;
import org.exolab.castor.util.DTDResolver;
import org.exolab.castor.xml.MarshalException;
import org.exolab.castor.xml.Unmarshaller;
import org.exolab.castor.xml.ValidationException;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Helper class to load the Castor JDO configuration from its configuration file.
* @author <a href="mailto:werner.guttmann@gmx.net">Werner Guttmann</a>
*/
public class JDOConfLoader {
private static Log _log = LogFactory.getFactory().getInstance( JDOConfLoader.class );
private static boolean _loaded = false;
private static JdoConf _jdoConf = null;
/**
* Loads the JDO configuration from the specified InputSource.
* @param source An InputSource pointing to the JDO configuration to be loaded.
* @param resolver An EntityResolver instance.
* @throws MappingException If the JDO configuration cannot be loaded/unmarshalled.
*/
public static synchronized void loadConfiguration (InputSource source, EntityResolver resolver)
throws MappingException
{
if (!_loaded) {
Unmarshaller unmarshaller;
unmarshaller = new Unmarshaller (JdoConf.class);
try {
if (resolver == null)
unmarshaller.setEntityResolver (new DTDResolver());
else
unmarshaller.setEntityResolver (new DTDResolver (resolver));
_jdoConf = (JdoConf) unmarshaller.unmarshal (source);
}
catch (MarshalException e) {
throw new MappingException (e);
}
catch (ValidationException e) {
throw new MappingException (e);
}
_loaded = true;
_log.debug( "Loaded jdo conf successfully" );
}
}
/**
* Loads the JDO configuration from the specified InputSource.
* @param jdoConf An JDoConf instance representing a JDO configuration to be loaded.
*/
public static synchronized void loadConfiguration (JdoConf jdoConf)
{
if (!_loaded) {
_jdoConf = jdoConf;
_loaded = true;
_log.debug( "Loaded jdo conf successfully" );
}
}
public static Database[] getDatabases (JdoConf jdoConf)
{
loadConfiguration (jdoConf);
return _jdoConf.getDatabase();
}
public static Database[] getDatabases (InputSource source, EntityResolver resolver)
throws MappingException
{
loadConfiguration (source, resolver);
return _jdoConf.getDatabase();
}
public static Database getDatabase (String databaseName, InputSource source, EntityResolver resolver)
throws MappingException
{
Database database = null;
loadConfiguration (source, resolver);
Database[] databases = getDatabases (source, resolver);
for (int i = 0; i < databases.length ;i++) {
if (databases[i].getName().equals (databaseName)) {
database =databases[i];
}
}
return database;
}
public static TransactionDemarcation getTransactionDemarcation (InputSource source, EntityResolver resolver)
throws MappingException
{
loadConfiguration (source, resolver);
return _jdoConf.getTransactionDemarcation();
}
public static Mapping[] getMapping (String databaseName, InputSource source, EntityResolver resolver)
throws MappingException
{
loadConfiguration (source, resolver);
return getDatabase (databaseName, source, resolver).getMapping();
}
/**
* Deletes JDO configuration.
*/
public static synchronized void deleteConfiguration () {
_loaded = false;
}
/**
* Indicates whether JDO configuration has loaded successfully.
* @return True if JDO configuration is loaded.
*/
public static synchronized boolean isLoaded() {
return _loaded;
}
}