/**
* 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.example.etl;
import java.util.List;
import org.apache.camel.Converter;
import org.apache.camel.Exchange;
import org.apache.camel.util.CastUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.orm.jpa.JpaTemplate;
/**
* A Message Transformer of an XML document to a Customer entity bean
*
* @version $Revision: 834787 $
*/
// START SNIPPET: example
@Converter
public class CustomerTransformer {
private static final transient Log LOG = LogFactory.getLog(CustomerTransformer.class);
/**
* A transformation method to convert a person document into a customer
* entity
*/
@Converter
public CustomerEntity toCustomer(PersonDocument doc, Exchange exchange) {
JpaTemplate template = exchange.getIn().getHeader("CamelJpaTemplate", JpaTemplate.class);
String user = doc.getUser();
CustomerEntity customer = findCustomerByName(template, user);
// let's convert information from the document into the entity bean
customer.setFirstName(doc.getFirstName());
customer.setSurname(doc.getLastName());
customer.setCity(doc.getCity());
LOG.debug("Created customer: " + customer);
return customer;
}
/**
* Finds a customer for the given username, or creates and inserts a new one
*/
protected CustomerEntity findCustomerByName(JpaTemplate template, String user) {
List<CustomerEntity> list = CastUtils.cast(template.find("select x from " + CustomerEntity.class.getName() + " x where x.userName = ?1", user));
if (list.isEmpty()) {
CustomerEntity answer = new CustomerEntity();
answer.setUserName(user);
template.persist(answer);
return answer;
} else {
return list.get(0);
}
}
}
// END SNIPPET: example