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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.tuscany.service.persistence.common;
import java.util.HashMap;
import java.util.Map;
import javax.persistence.EntityManagerFactory;
import javax.persistence.spi.PersistenceProvider;
import javax.persistence.spi.PersistenceUnitInfo;
/**
* Default implementation of the persistence unit builder.
*
* @version $Rev$ $Date$
*/
public class DefaultPersistenceUnitBuilder implements PersistenceUnitBuilder {
/** Persistence unit scanner */
private PersistenceUnitScanner scanner = new PersistenceUnitScanner();
/**
* Builds the entity manager factory matching the unit name. All persistence.xml
* files available for the specified classloader is scanned for the specified
* persistence unit. The JPA provider API is used to create the entity manager
* factory.
*
* @param unitName Persistence unit name.
* @param classLoader Classloader.
* @return Entity manager factory.
*/
public EntityManagerFactory newEntityManagerFactory(String unitName, ClassLoader classLoader) {
PersistenceUnitInfo info = scanner.getPersistenceUnitInfo(unitName, classLoader);
String providerClass = info.getPersistenceProviderClassName();
try {
Map overrides = new HashMap();
PersistenceProvider provider = (PersistenceProvider) Class.forName(providerClass).newInstance();
return provider.createContainerEntityManagerFactory(info, overrides);
} catch (InstantiationException ex) {
throw new TuscanyJpaException(ex);
} catch (IllegalAccessException ex) {
throw new TuscanyJpaException(ex);
} catch (ClassNotFoundException ex) {
throw new TuscanyJpaException(ex);
}
}
}
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