001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.camel.example.etl;
018
019 import java.util.List;
020
021 import org.apache.camel.Converter;
022 import org.apache.commons.logging.Log;
023 import org.apache.commons.logging.LogFactory;
024
025 import org.springframework.orm.jpa.JpaTemplate;
026
027 /**
028 * A Message Transformer of an XML document to a Customer entity bean
029 *
030 * @version $Revision: 1.1 $
031 */
032 // START SNIPPET: example
033 @Converter
034 public class CustomerTransformer {
035 private static final transient Log LOG = LogFactory.getLog(CustomerTransformer.class);
036 private JpaTemplate template;
037
038 public CustomerTransformer(JpaTemplate template) {
039 this.template = template;
040 }
041
042 /**
043 * A transformation method to convert a person document into a customer
044 * entity
045 */
046 @Converter
047 public CustomerEntity toCustomer(PersonDocument doc) {
048 String user = doc.getUser();
049 CustomerEntity customer = findCustomerByName(user);
050
051 // lets convert information from the document into the entity bean
052
053 customer.setFirstName(doc.getFirstName());
054 customer.setSurname(doc.getLastName());
055 customer.setCity(doc.getCity());
056
057 LOG.debug("Created customer: " + customer);
058 return customer;
059 }
060
061 /**
062 * Finds a customer for the given username, or creates and inserts a new one
063 */
064 protected CustomerEntity findCustomerByName(String user) {
065 List<CustomerEntity> list = template.find("select x from " + CustomerEntity.class.getName() + " x where x.userName = ?1", user);
066 if (list.isEmpty()) {
067 CustomerEntity answer = new CustomerEntity();
068 answer.setUserName(user);
069 template.persist(answer);
070 return answer;
071 } else {
072 return list.get(0);
073 }
074 }
075 }
076 // END SNIPPET: example