| /** |
| * 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 |
| */ |
| 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); |
| } |
| } |