1 /*
2 * Copyright 2015 the original author or authors.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package org.openehealth.ipf.platform.camel.hl7.converter;
18
19 import javax.jms.*;
20
21 import ca.uhn.hl7v2.HL7Exception;
22 import ca.uhn.hl7v2.HapiContext;
23 import org.springframework.jms.support.converter.MessageConversionException;
24 import org.springframework.jms.support.converter.MessageConverter;
25
26 /**
27 * HL7MessageConverter helps serializing a HL7 message to and from a string for the purpose of
28 * routing it through a JMS queue. The same converter should be used on consumer and producer side.
29 * <p/>
30 * HAPI HL7 message objects have a reference to a transient parser, which in return has the reference
31 * to the valid HapiContext. After deserialization, the context and parser references have to be
32 * re-established.
33 * <p/>
34 * Currently, this class accepts String and HAPI message objects only. Deserialization will always
35 * produce a HAPI Message object.
36 */
37 public class HL7MessageConverter implements MessageConverter {
38
39 private final HapiContext hapiContext;
40
41 public HL7MessageConverter(HapiContext hapiContext) {
42 this.hapiContext = hapiContext;
43 }
44
45 /**
46 * Returns a {@link javax.jms.TextMessage} instance containing the HL7 message as string
47 *
48 * @param o incoming object, can be either String or {@link ca.uhn.hl7v2.model.Message}
49 * @param session JMS session
50 * @return a {@link javax.jms.TextMessage} instance containing the HL7 message as string
51 * @throws JMSException
52 * @throws MessageConversionException
53 */
54 @Override
55 public Message toMessage(Object o, Session session) throws JMSException, MessageConversionException {
56 if (o instanceof String) {
57 return session.createTextMessage((String)o);
58 }
59 if (o instanceof ca.uhn.hl7v2.model.Message) {
60 try {
61 return session.createTextMessage(((ca.uhn.hl7v2.model.Message) o).encode());
62 } catch (HL7Exception e) {
63 throw new RuntimeException(e);
64 }
65 }
66 throw new MessageConversionException("Unexpected class : " + o.getClass());
67 }
68
69 /**
70 * Returns a {@link ca.uhn.hl7v2.model.Message} built from the JMS message type, using the specified HapiContext
71 *
72 * @param message JMS {@link javax.jms.ObjectMessage} or {@link javax.jms.TextMessage}
73 * @return a {@link ca.uhn.hl7v2.model.Message} built from the JMS message type
74 * @throws JMSException
75 * @throws MessageConversionException
76 */
77 @Override
78 public Object fromMessage(Message message) throws JMSException, MessageConversionException {
79 if (message instanceof ObjectMessage) {
80 ca.uhn.hl7v2.model.Message msg = (ca.uhn.hl7v2.model.Message) ((ObjectMessage) message).getObject();
81 msg.setParser(hapiContext.getGenericParser());
82 return msg;
83 }
84 if (message instanceof TextMessage) {
85 String msg = ((TextMessage) message).getText();
86 try {
87 return hapiContext.getGenericParser().parse(msg);
88 } catch (HL7Exception e) {
89 throw new RuntimeException(e);
90 }
91 }
92 throw new MessageConversionException("Unexpected class : " + message.getClass());
93 }
94 }
95