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Spring Framework example source code file (EntityManagerFactoryAccessor.java)

This example Spring Framework source code file (EntityManagerFactoryAccessor.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Spring Framework tags/keywords

entitymanager, entitymanager, entitymanagerfactory, entitymanagerfactory, entitymanagerfactoryaccessor, hashmap, illegalstateexception, log, map, map, no, no, util

The Spring Framework EntityManagerFactoryAccessor.java source code

/*
 * Copyright 2002-2006 the original author or authors.
 *
 * 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
 *
 *      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.springframework.orm.jpa;

import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;

/**
 * Base class for any class that needs to access an EntityManagerFactory,
 * usually in order to obtain an EntityManager. Defines common properties.
 *
 * <p>Not intended to be used directly. See JpaAccessor.
 *
 * @author Juergen Hoeller
 * @since 2.0
 * @see JpaAccessor
 * @see EntityManagerFactoryUtils
 */
public abstract class EntityManagerFactoryAccessor {

	/** Logger available to subclasses */
	protected final Log logger = LogFactory.getLog(getClass());

	private EntityManagerFactory entityManagerFactory;

	private final Map jpaPropertyMap = new HashMap();


	/**
	 * Set the JPA EntityManagerFactory that should be used to create
	 * EntityManagers.
	 * @see javax.persistence.EntityManagerFactory#createEntityManager()
	 * @see javax.persistence.EntityManagerFactory#createEntityManager(java.util.Map)
	 */
	public void setEntityManagerFactory(EntityManagerFactory emf) {
		this.entityManagerFactory = emf;
	}

	/**
	 * Return the JPA EntityManagerFactory that should be used to create
	 * EntityManagers.
	 */
	public EntityManagerFactory getEntityManagerFactory() {
		return entityManagerFactory;
	}

	/**
	 * Specify JPA properties, to be passed into
	 * <code>EntityManagerFactory.createEntityManager(Map) (if any).
	 * <p>Can be populated with a String "value" (parsed via PropertiesEditor)
	 * or a "props" element in XML bean definitions.
	 * @see javax.persistence.EntityManagerFactory#createEntityManager(java.util.Map)
	 */
	public void setJpaProperties(Properties jpaProperties) {
		CollectionUtils.mergePropertiesIntoMap(jpaProperties, this.jpaPropertyMap);
	}

	/**
	 * Specify JPA properties as a Map, to be passed into
	 * <code>EntityManagerFactory.createEntityManager(Map) (if any).
	 * <p>Can be populated with a "map" or "props" element in XML bean definitions.
	 * @see javax.persistence.EntityManagerFactory#createEntityManager(java.util.Map)
	 */
	public void setJpaPropertyMap(Map jpaProperties) {
		if (jpaProperties != null) {
			this.jpaPropertyMap.putAll(jpaProperties);
		}
	}

	/**
	 * Allow Map access to the JPA properties to be passed to the persistence
	 * provider, with the option to add or override specific entries.
	 * <p>Useful for specifying entries directly, for example via "jpaPropertyMap[myKey]".
	 */
	public Map getJpaPropertyMap() {
		return jpaPropertyMap;
	}


	/**
	 * Obtain a new EntityManager from this accessor's EntityManagerFactory.
	 * <p>Can be overridden in subclasses to create specific EntityManager variants.
	 * @return a new EntityManager
	 * @throws IllegalStateException if this accessor is not configured with an EntityManagerFactory
	 * @see javax.persistence.EntityManagerFactory#createEntityManager()
	 * @see javax.persistence.EntityManagerFactory#createEntityManager(java.util.Map)
	 */
	protected EntityManager createEntityManager() throws IllegalStateException {
		EntityManagerFactory emf = getEntityManagerFactory();
		Assert.state(emf != null, "No EntityManagerFactory specified");
		Map properties = getJpaPropertyMap();
		return (!CollectionUtils.isEmpty(properties) ? emf.createEntityManager(properties) : emf.createEntityManager());
	}

	/**
	 * Obtain the transactional EntityManager for this accessor's EntityManagerFactory, if any.
	 * @return the transactional EntityManager, or <code>null if none
	 * @throws IllegalStateException if this accessor is not configured with an EntityManagerFactory
	 * @see EntityManagerFactoryUtils#getTransactionalEntityManager(javax.persistence.EntityManagerFactory)
	 * @see EntityManagerFactoryUtils#getTransactionalEntityManager(javax.persistence.EntityManagerFactory, java.util.Map)
	 */
	protected EntityManager getTransactionalEntityManager() throws IllegalStateException{
		EntityManagerFactory emf = getEntityManagerFactory();
		Assert.state(emf != null, "No EntityManagerFactory specified");
		return EntityManagerFactoryUtils.getTransactionalEntityManager(emf, getJpaPropertyMap());
	}

}

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