/**
* 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 2000-2002 (C) Intalio, Inc. All Rights Reserved.
*
* $Id: PersistenceFactoryRegistry.java,v 1.3 2004/10/01 13:25:07 snyder Exp $
*/
package org.exolab.castor.persist;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.StringTokenizer;
import org.exolab.castor.util.LocalConfiguration;
import org.exolab.castor.util.Logger;
import org.exolab.castor.util.Messages;
import org.exolab.castor.persist.spi.PersistenceFactory;
/**
* Registry for {@link PersistenceFactory} implementations
* obtained from the Castor properties file and used by the
* JDO database configuration file.
*
* @author <a href="arkin@intalio.com">Assaf Arkin</a>
* @version $Revision: 1.3 $ $Date: 2004/10/01 13:25:07 $
*/
public class PersistenceFactoryRegistry
{
/**
* Property listing all the available persistence
* factories. (<tt>org.exolab.castor.jdo.engines</tt>).
*/
private static final String FactoriesProperty =
"org.exolab.castor.jdo.engines";
/**
* Association between factory name and object.
*/
private static Hashtable _factories;
/**
* Returns a persistence factory with the specified name.
* The factories are loaded from the Castor properties
* file. Returns null if the named factory is not
* supported.
*
* @param name The factory name
* @return The {@link PersistenceFactory} object, null
* if no factory with this name exists
*/
public static PersistenceFactory getPersistenceFactory( String name )
{
load();
return (PersistenceFactory) _factories.get( name );
}
/**
* Returns the names of all the configured persistence
* factories. The names can be used to obtain a factory
* from {@link #getPersistenceFactory}.
*
* @return Names of persistence factories
*/
public static String[] getFactoryNames()
{
String[] names;
Enumeration enumeration;
load();
names = new String[ _factories.size() ];
enumeration = _factories.keys();
for ( int i = 0 ; i < names.length ; ++i )
names[ i ] = (String) enumeration.nextElement();
return names;
}
/**
* Load the factories from the properties file, if not
* loaded before.
*/
private static synchronized void load()
{
if ( _factories == null ) {
String prop;
StringTokenizer tokenizer;
PersistenceFactory factory;
Class cls;
_factories = new Hashtable();
prop = LocalConfiguration.getInstance().getProperty( FactoriesProperty, "" );
tokenizer = new StringTokenizer( prop, ", " );
while ( tokenizer.hasMoreTokens() ) {
prop = tokenizer.nextToken();
try {
cls = PersistenceFactoryRegistry.class.getClassLoader().loadClass( prop );
factory = (PersistenceFactory) cls.newInstance();
_factories.put( factory.getFactoryName(), factory );
} catch ( Exception except ) {
Logger.getSystemLogger().println( Messages.format( "persist.missingPersistenceFactory", prop ) );
}
}
}
}
}