runtime/org.argeo.slc.support.activemq/src/main/java/org/argeo/slc/jms/MarshallerMessageConverter.java

   1 package org.argeo.slc.jms;
   2
   3 import java.util.Enumeration;
   4
   5 import javax.jms.JMSException;
   6 import javax.jms.Message;
   7 import javax.jms.Session;
   8 import javax.jms.TextMessage;
   9
  10 import org.apache.commons.logging.Log;
  11 import org.apache.commons.logging.LogFactory;
  12 import org.argeo.slc.SlcException;
  13 import org.springframework.jms.support.converter.MessageConversionException;
  14 import org.springframework.jms.support.converter.MessageConverter;
  15 import org.springframework.oxm.Marshaller;
  16 import org.springframework.oxm.Unmarshaller;
  17 import org.springframework.xml.transform.StringResult;
  18 import org.springframework.xml.transform.StringSource;
  19
  20 public class MarshallerMessageConverter implements MessageConverter {
  21         private final static Log log = LogFactory
  22                         .getLog(MarshallerMessageConverter.class);
  23
  24         private Marshaller marshaller;
  25         private Unmarshaller unmarshaller;
  26
  27         /** @return the converted message or null if the message itself is null */
  28         public Object fromMessage(Message message) throws JMSException,
  29                         MessageConversionException {
  30                 if (message == null) {
  31                         return null;
  32                 }
  33
  34                 if (log.isTraceEnabled()) {
  35                         Enumeration<String> names = message.getPropertyNames();
  36                         while (names.hasMoreElements()) {
  37                                 String name = names.nextElement();
  38                                 log.trace("JMS Property: " + name + "="
  39                                                 + message.getObjectProperty(name));
  40                         }
  41                 }
  42
  43                 if (message instanceof TextMessage) {
  44
  45                         String text = ((TextMessage) message).getText();
  46
  47                         if (text == null)
  48                                 throw new SlcException(
  49                                                 "Cannot unmarshall message without body: " + message);
  50
  51                         try {
  52                                 return unmarshaller.unmarshal(new StringSource(text));
  53                         } catch (Exception e) {
  54                                 throw new SlcException("Could not unmarshall " + text, e);
  55                         }
  56                 } else {
  57                         throw new SlcException("This type of messages is not supported: "
  58                                         + message);
  59                 }
  60         }
  61
  62         public Message toMessage(Object object, Session session)
  63                         throws JMSException, MessageConversionException {
  64                 StringResult result = new StringResult();
  65                 try {
  66                         marshaller.marshal(object, result);
  67                 } catch (Exception e) {
  68                         throw new SlcException("Could not marshall " + object, e);
  69                 }
  70                 TextMessage msg = session.createTextMessage();
  71                 msg.setText(result.toString());
  72                 return msg;
  73         }
  74
  75         public void setMarshaller(Marshaller marshaller) {
  76                 this.marshaller = marshaller;
  77         }
  78
  79         public void setUnmarshaller(Unmarshaller unmarshaller) {
  80                 this.unmarshaller = unmarshaller;
  81         }
  82
  83 }