/**
* 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.camel.component.jpa;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceException;
import org.apache.camel.Exchange;
import org.apache.camel.Expression;
import org.apache.camel.impl.DefaultProducer;
import org.springframework.orm.jpa.JpaCallback;
/**
* @version $Revision: 982577 $
*/
public class JpaProducer extends DefaultProducer {
private final TransactionStrategy template;
private final JpaEndpoint endpoint;
private final Expression expression;
public JpaProducer(JpaEndpoint endpoint, Expression expression) {
super(endpoint);
this.endpoint = endpoint;
this.expression = expression;
this.template = endpoint.createTransactionStrategy();
}
public void process(final Exchange exchange) {
exchange.getIn().setHeader(JpaConstants.JPA_TEMPLATE, endpoint.getTemplate());
final Object values = expression.evaluate(exchange, Object.class);
if (values != null) {
template.execute(new JpaCallback() {
@SuppressWarnings("unchecked")
public Object doInJpa(EntityManager entityManager) throws PersistenceException {
if (values.getClass().isArray()) {
Object[] array = (Object[]) values;
for (int index = 0; index < array.length; index++) {
Object managedEntity = save(array[index], entityManager);
if (!endpoint.isUsePersist()) {
array[index] = managedEntity;
}
}
} else if (values instanceof Collection) {
Collection collection = (Collection) values;
List managedEntities = new ArrayList();
for (Iterator iter = collection.iterator(); iter.hasNext();) {
Object managedEntity = save(iter.next(), entityManager);
managedEntities.add(managedEntity);
}
if (!endpoint.isUsePersist()) {
collection.clear();
collection.addAll(managedEntities);
}
} else {
Object managedEntity = save(values, entityManager);
if (!endpoint.isUsePersist()) {
exchange.getIn().setBody(managedEntity);
}
}
if (endpoint.isFlushOnSend()) {
entityManager.flush();
}
return null;
}
/**
* save the given entity end return the managed entity
*
* @param entity
* @param entityManager
* @return the managed entity
*/
private Object save(final Object entity, EntityManager entityManager) {
if (endpoint.isUsePersist()) {
entityManager.persist(entity);
return entity;
} else {
return entityManager.merge(entity);
}
}
});
}
exchange.getIn().removeHeader(JpaConstants.JPA_TEMPLATE);
}
}