/*
* Copyright 2002-2008 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.jdo.support;
import javax.jdo.JDOException;
import javax.jdo.PersistenceManager;
import javax.jdo.PersistenceManagerFactory;
import org.springframework.dao.DataAccessException;
import org.springframework.dao.DataAccessResourceFailureException;
import org.springframework.dao.support.DaoSupport;
import org.springframework.orm.jdo.JdoTemplate;
import org.springframework.orm.jdo.PersistenceManagerFactoryUtils;
/**
* Convenient super class for JDO data access objects.
*
* <p>Requires a PersistenceManagerFactory to be set, providing a JdoTemplate
* based on it to subclasses. Can alternatively be initialized directly with a
* JdoTemplate, to reuse the latter's settings such as the PersistenceManagerFactory,
* JdoDialect, flush mode, etc.
*
* <p>This base class is mainly intended for JdoTemplate usage but can also
* be used when working with PersistenceManagerFactoryUtils directly, for example
* in combination with JdoInterceptor-managed PersistenceManagers. Convenience
* <code>getPersistenceManager</code> and <code>releasePersistenceManager</code>
* methods are provided for that usage style.
*
* <p>This class will create its own JdoTemplate if only a PersistenceManagerFactory
* is passed in. The "allowCreate" flag on that JdoTemplate will be "true" by default.
* A custom JdoTemplate instance can be used through overriding <code>createJdoTemplate</code>.
*
* @author Juergen Hoeller
* @since 28.07.2003
* @see #setPersistenceManagerFactory
* @see #setJdoTemplate
* @see #createJdoTemplate
* @see #getPersistenceManager
* @see #releasePersistenceManager
* @see org.springframework.orm.jdo.JdoTemplate
* @see org.springframework.orm.jdo.JdoInterceptor
*/
public abstract class JdoDaoSupport extends DaoSupport {
private JdoTemplate jdoTemplate;
/**
* Set the JDO PersistenceManagerFactory to be used by this DAO.
* Will automatically create a JdoTemplate for the given PersistenceManagerFactory.
* @see #createJdoTemplate
* @see #setJdoTemplate
*/
public final void setPersistenceManagerFactory(PersistenceManagerFactory persistenceManagerFactory) {
if (this.jdoTemplate == null || persistenceManagerFactory != this.jdoTemplate.getPersistenceManagerFactory()) {
this.jdoTemplate = createJdoTemplate(persistenceManagerFactory);
}
}
/**
* Create a JdoTemplate for the given PersistenceManagerFactory.
* Only invoked if populating the DAO with a PersistenceManagerFactory reference!
* <p>Can be overridden in subclasses to provide a JdoTemplate instance
* with different configuration, or a custom JdoTemplate subclass.
* @param persistenceManagerFactory the JDO PersistenceManagerFactoryto create a JdoTemplate for
* @return the new JdoTemplate instance
* @see #setPersistenceManagerFactory
*/
protected JdoTemplate createJdoTemplate(PersistenceManagerFactory persistenceManagerFactory) {
return new JdoTemplate(persistenceManagerFactory);
}
/**
* Return the JDO PersistenceManagerFactory used by this DAO.
*/
public final PersistenceManagerFactory getPersistenceManagerFactory() {
return (this.jdoTemplate != null ? this.jdoTemplate.getPersistenceManagerFactory() : null);
}
/**
* Set the JdoTemplate for this DAO explicitly,
* as an alternative to specifying a PersistenceManagerFactory.
* @see #setPersistenceManagerFactory
*/
public final void setJdoTemplate(JdoTemplate jdoTemplate) {
this.jdoTemplate = jdoTemplate;
}
/**
* Return the JdoTemplate for this DAO, pre-initialized
* with the PersistenceManagerFactory or set explicitly.
*/
public final JdoTemplate getJdoTemplate() {
return jdoTemplate;
}
@Override
protected final void checkDaoConfig() {
if (this.jdoTemplate == null) {
throw new IllegalArgumentException("persistenceManagerFactory or jdoTemplate is required");
}
}
/**
* Get a JDO PersistenceManager, either from the current transaction or
* a new one. The latter is only allowed if the "allowCreate" setting
* of this bean's JdoTemplate is true.
* @return the JDO PersistenceManager
* @throws DataAccessResourceFailureException if the PersistenceManager couldn't be created
* @throws IllegalStateException if no thread-bound PersistenceManager found and allowCreate false
* @see org.springframework.orm.jdo.PersistenceManagerFactoryUtils#getPersistenceManager
*/
protected final PersistenceManager getPersistenceManager() {
return getPersistenceManager(this.jdoTemplate.isAllowCreate());
}
/**
* Get a JDO PersistenceManager, either from the current transaction or
* a new one. The latter is only allowed if "allowCreate" is true.
* @param allowCreate if a non-transactional PersistenceManager should be created
* when no transactional PersistenceManager can be found for the current thread
* @return the JDO PersistenceManager
* @throws DataAccessResourceFailureException if the PersistenceManager couldn't be created
* @throws IllegalStateException if no thread-bound PersistenceManager found and allowCreate false
* @see org.springframework.orm.jdo.PersistenceManagerFactoryUtils#getPersistenceManager
*/
protected final PersistenceManager getPersistenceManager(boolean allowCreate)
throws DataAccessResourceFailureException, IllegalStateException {
return PersistenceManagerFactoryUtils.getPersistenceManager(getPersistenceManagerFactory(), allowCreate);
}
/**
* Convert the given JDOException to an appropriate exception from the
* org.springframework.dao hierarchy.
* <p>Delegates to the convertJdoAccessException method of this DAO's JdoTemplate.
* @param ex JDOException that occured
* @return the corresponding DataAccessException instance
* @see #setJdoTemplate
* @see org.springframework.orm.jdo.JdoTemplate#convertJdoAccessException
*/
protected final DataAccessException convertJdoAccessException(JDOException ex) {
return this.jdoTemplate.convertJdoAccessException(ex);
}
/**
* Close the given JDO PersistenceManager, created via this DAO's
* PersistenceManagerFactory, if it isn't bound to the thread.
* @param pm PersistenceManager to close
* @see org.springframework.orm.jdo.PersistenceManagerFactoryUtils#releasePersistenceManager
*/
protected final void releasePersistenceManager(PersistenceManager pm) {
PersistenceManagerFactoryUtils.releasePersistenceManager(pm, getPersistenceManagerFactory());
}
}
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