content: /*
   *  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.causeway.persistence.jdo.spring.support;
  
  import javax.jdo.PersistenceManager;
  import javax.jdo.PersistenceManagerFactory;
  
  import org.springframework.beans.factory.FactoryBean;
  import org.springframework.util.Assert;
  
  /**
   * Proxy that implements the {@link javax.jdo.PersistenceManager} interface,
   * delegating to a thread-bound PersistenceManager on each invocation -
   * as defined by the JDO 3.0 specification. This class makes such a standard
   * JDO PersistenceManager proxy available for bean references.
   *
   * <p>The main advantage of this proxy is that it allows DAOs to work with a
   * plain JDO PersistenceManager reference in JDO 3.0 style
   * (see {@link javax.jdo.PersistenceManagerFactory#getPersistenceManagerProxy()}),
   * exposing the exact behavior that the target JDO provider implements.
   *
   * @see SpringPersistenceManagerProxyBean
   * @see javax.jdo.PersistenceManagerFactory#getPersistenceManagerProxy()
   */
  public class StandardPersistenceManagerProxyBean implements FactoryBean<PersistenceManager> {
  
  	private PersistenceManager proxy;
  
  	/**
  	 * Set the target JDO PersistenceManagerFactory that this proxy should
  	 * delegate to. This should be the raw PersistenceManagerFactory, as
  	 * accessed by JdoTransactionManager.
  	 * @see org.apache.causeway.persistence.jdo.spring.integration.JdoTransactionManager
  	 */
  	public void setPersistenceManagerFactory(PersistenceManagerFactory pmf) {
  		Assert.notNull(pmf, "PersistenceManagerFactory must not be null");
  		this.proxy = pmf.getPersistenceManagerProxy();
  	}
  
  	@Override
  	public PersistenceManager getObject() {
  		return this.proxy;
  	}
  
  	@Override
  	public Class<? extends PersistenceManager> getObjectType() {
  		return (this.proxy != null ? this.proxy.getClass() : PersistenceManager.class);
  	}
  
  	@Override
  	public boolean isSingleton() {
  		return true;
  	}
  
  }
  