/**
* 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
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* 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 8034 2009-01-26 00:59:04Z rjoachim $
*/
package org.exolab.castor.persist;
import java.util.Enumeration;
import java.util.Hashtable;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.castor.core.util.AbstractProperties;
import org.castor.cpa.CPAProperties;
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: 8034 $ $Date: 2006-04-10 16:39:24 -0600 (Mon, 10 Apr 2006) $
*/
public final class PersistenceFactoryRegistry {
/** 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(final 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) {
_factories = new Hashtable();
AbstractProperties properties = CPAProperties.getInstance();
Object[] objects = properties.getObjectArray(
CPAProperties.PERSISTENCE_FACTORIES, properties.getApplicationClassLoader());
for (int i = 0; i < objects.length; i++) {
PersistenceFactory factory = (PersistenceFactory) objects[i];
_factories.put(factory.getFactoryName(), factory);
}
}
}
/**
* Hide Utility Class Constructor.
*/
private PersistenceFactoryRegistry() { }
}