Hi Niranjan,
public Message convert(Message message, String version)
throws
EncodingNotSupportedException, HL7Exception {
String inVersion = message.getVersion();
Terser terser = new Terser(message);
if (!terser.get("/MSH-12").equals(version))
{
terser.set("/MSH-12",
version);
PipeParser pp = new
PipeParser();
message =
pp.parse(pp.encode(message));
return message;
} else {
return message;
}
}
Hope that helps. And given that HAPI 0.6 is out, it is a good idea to
convert all messages to 2.6 [instead of 2.5 as I am doing], and then process
them.
I haven't tried the ModelClassFactory, but if that does the job in pretty
much the same way, please compare the performance of both solutions. I parse
the message twice and encode it once, making it slower.
If you want to use the Idea James first mentioned, i.e. using XPath like
expressions, I would side with Michael's idea of using LightHl7Lib. I use
LightHl7Lib for preprocessing messages before parsing them with HAPI.
LightHl7Lib appears to be faster to me. I haven't run any metrics though.
Regards,
rahul
From: Sharma, Niranjan K (GE Healthcare) [mailto:[email protected]]
Sent: Thursday, July 23, 2009 3:26 PM
To: rahul somasunderam; [email protected]
Subject: RE: [HAPI-devel] How to access repeating fields using thegeneric
Message type
Rahul,
How do you use Terser to convert to V2.5?
I think James idea of having a extended ModelClassFactory for V2.6 can serve
the purpose?
Thoughts?
Thanks.
Regards
-Niranjan.
From: rahul somasunderam [mailto:[email protected]]
Sent: Thursday, July 23, 2009 12:51 PM
To: [email protected]
Subject: Re: [HAPI-devel] How to access repeating fields using thegeneric
Message type
Most of the times you're fine converting a message to the highest supported
version.
We use the terser and convert any message to a 2.5 message. Then we apply
the logic that would apply for a 2.5 message.
I understand there are some message types, some data types, and some
segments which get dropped as you progress across versions, but we haven't
lost much data because of that.
Regards,
rahul
From: Kamp, Daniel (GE Healthcare) [mailto:[email protected]]
Sent: Thursday, July 23, 2009 11:36 AM
To: [email protected]
Subject: [HAPI-devel] How to access repeating fields using the generic
Message type
Good afternoon,
I am trying to write a transformer which converts an HL7 message to a local
object graph. In doing so, I need to account for repeating fields.
For example, PID-5 can have multiple names and we need to parse it out into
a List of PatientName objects (each PatientName object contains family name,
given name, and name type code).
Since we need to support many versions of HL7 we can not use a specific v
2.x model data types. Instead we are relying on the generic:
ca.uhn.hl7v2.model.Message
ca.uhn.hl7v2.util.Terser
to parse the message.
I have had a difficult time finding simple examples of parsing repeating
fields using these generic classes.
I realize if we used
ca.uhn.hl7v2.model.v25.message
it would be easier to do this, but we need to remain version agnostic.
Can anyone assist me in a simple way to extract a repeating field as
mentioned above?
Thank you in advance,
Dan
Dan Kamp
GE Healthcare
Information Technologies - Global Engineering
Shared Asset Solutions
T (847) 277- 4327
D *567-4327
E [email protected] <blocked::mailto:[email protected]>
www.gehealthcare.com <blocked::http://www.gehealthcare.com/>
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