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  * Copyright (c) OSGi Alliance (2009, 2012). All Rights Reserved.
  * Licensed 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.osgi.service.jpa;
import  javax.persistence.EntityManagerFactory;

This service interface offers JPA clients the ability to create instances of EntityManagerFactory for a given named persistence unit. A service instance will be created for each named persistence unit and can be filtered by comparing the value of the property containing the persistence unit name. This service is used specifically when the caller wants to pass in factory-scoped properties as arguments. If no properties are being used in the creation of the EntityManagerFactory then the basic EntityManagerFactory service should be used.
public interface EntityManagerFactoryBuilder {

The name of the persistence unit.
	public static final String	JPA_UNIT_NAME"";

The version of the persistence unit bundle.
	public static final String	JPA_UNIT_VERSION"osgi.unit.version";

The class name of the provider that registered the service and implements the JPA javax.persistence.PersistenceProvider interface.
	public static final String	JPA_UNIT_PROVIDER"osgi.unit.provider";

Return an EntityManagerFactory instance configured according to the properties defined in the corresponding persistence descriptor, as well as the properties passed into the method.

props Properties to be used, in addition to those in the persistence descriptor, for configuring the EntityManagerFactory for the persistence unit.
An EntityManagerFactory for the persistence unit associated with this service. Must not be null.
	EntityManagerFactory createEntityManagerFactory(Map<StringObjectprops);
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