Would advise in favour of adding default and invalid Obx2Type settings, having
just had a problem with messages containing bad OBX segments.
context.getPipeParser().getParserConfiguration().setDefaultObx2Type("ST");
context.getPipeParser().getParserConfiguration().setInvalidObx2Type("ST");
Watch out for MFNs if you get them. They have similar type assigning fields,
which the HAPI 2.2 release seems to cope with, but the HAPI 2.3 library is
strict about but lacks a configuration for correcting them. The code base has a
fix for it, but there hasn’t been a release containing it. I’m not game to try
to do the entire build myself, so mostly use the 2.2 release. One of our
systems leaves the field containing the type blank, be aware David, since we
both receive messages from that sender.
Ian Vowles
Integration Specialist, Metro North Integration Centre
Metro North IT
Citilink Lobby 1, Level 3
153 Campbell St, Bowen Hills QLD 4006
P: 07 3646 2557
E: [email protected]<mailto:[email protected]>
metronorth.health.qld.gov.au<https://metronorth.health.qld.gov.au/>
[Description: Description: Putting people
first]<http://qheps.health.qld.gov.au/metronorth/html/email-signature.htm>
[Values in Action]
[Description: Description: Facebook]<http://www.facebook.com/metronorthhhs>
[Description: Description: Twitter] <http://www.twitter.com/MetroNorthHHS>
[Description: Description: LinkedIn]
<http://www.linkedin.com/company/metro-north-hospital-and-health-service>
follow us on social media
From: Andrew Ring via Hl7api-devel <[email protected]>
Sent: Thursday, 30 January 2020 4:30 AM
To: David Bunzli <[email protected]>
Cc: [email protected]
Subject: Re: [HAPI-devel] Parse MSH from arbitrary message
Hi David, thanks for the response here. I did end up coming to a solution,
which looks like:
/**
* Parse an hl7 message and extract the header (MSH) segment.
*
* @param hl7Message The hl7 message to parse.
* @return The parsed MSH segment, or null on error.
*/
public static MSH getHeader(final String hl7Message) {
if (Objects.isNull(hl7Message)) return null;
try {
final HapiContext context = new DefaultHapiContext();
// Parse the message in whatever hl7 version it is declared to be
// This will validate the message structure, throwing an exception
if invalid
context.getPipeParser().parse(hl7Message);
// Convert message into most recent version format, since they're
backwards compatible
final CanonicalModelClassFactory modelClassFactory = new
CanonicalModelClassFactory(CANONICAL_VERSION);
context.setModelClassFactory(modelClassFactory);
// We disable validation because deprecated fields appear to cause
parsing errors when
// up-converting messages
context.setValidationContext(new NoValidation());
final Message parsedMesssage =
context.getPipeParser().parse(hl7Message);
final MSH msh = (MSH) parsedMesssage.get("MSH");
return msh;
} catch (ClassCastException | HL7Exception ex) {
LOG.warn("Unable to parse header from hl7 message:\n{}",
forPrinting(hl7Message));
return null;
}
}
I don't love this, since it requires turning off the validation when
up-versioning, but it appears to work on all test inputs I've attempted.
~Andrew
On Tue, Jan 28, 2020 at 6:28 PM David Bunzli
<[email protected]<mailto:[email protected]>> wrote:
Hi Andrew,
Is your concern about casting related to performance? Because, in general,
solutions should be provisioned for the work they have to do. If you need more
processing grunt, its often better to tackle that before 'optimising' your code.
Aside from casting the whole message, you can cast the segment [eg
(pseudo-code) MSH msh = (MSH) Terser.getSegment("MSH")] to get a proper MSH
object. But this option is still casting.
Another option is treating the message as a String eg...
protected static String getMsh10(String input) {
int startOfMsh10 = StringUtils.ordinalIndexOf(input, "|", 10);
int lengthOfMsh10 = StringUtils.ordinalIndexOf(input, "|", 11) -
startOfMsh10;
return StringUtils.mid(
input
, startOfMsh10
, lengthOfMsh10
);
}
But that option brings me back to the first point - 'optimising' by String
manipulation is convoluted. It'd have been better to wear the costs of parsing
and casting the message and enjoy the benefits of using HAPI.
Hope this helps,
David
----------------------------------------------------------------------
Message: 1
Date: Thu, 23 Jan 2020 18:13:11 -0800
From: Andrew Ring <[email protected]<mailto:[email protected]>>
To:
[email protected]<mailto:[email protected]>
Subject: [HAPI-devel] Parse MSH from arbitrary message
Message-ID:
<CAEw6ye59CaL9rrOF3+Xi0KkvPBrdhhPp3G5gjCNpT+E=ge3...@mail.gmail.com<mailto:[email protected]>>
Content-Type: text/plain; charset="utf-8"
I'm receiving HL7 messages of any type, and want to examine the MSH segment
before having to cast the message to a particular type. I can't seem to find a
mechanism to do this. I can get individual MSH fields using a Terser, but I
would prefer to use well typed structures. Even getting the MSH segment using
Terser.getSegment() does not appear to be able to be converted into an MSH
object. Can anyone help?
Thanks,
Andrew Ring
-------------- next part --------------
An HTML attachment was scrubbed...
------------------------------
------------------------------
Subject: Digest Footer
_______________________________________________
Hl7api-devel mailing list
[email protected]<mailto:[email protected]>
https://lists.sourceforge.net/lists/listinfo/hl7api-devel
------------------------------
End of Hl7api-devel Digest, Vol 144, Issue 5
********************************************
********************************************************************************
This email, including any attachments sent with it, is confidential and for the
sole use of the intended recipient(s). This confidentiality is not waived or
lost, if you receive it and you are not the intended recipient(s), or if it is
transmitted/received in error.
Any unauthorised use, alteration, disclosure, distribution or review of this
email is strictly prohibited. The information contained in this email,
including any attachment sent with it, may be subject to a statutory duty of
confidentiality if it relates to health service matters.
If you are not the intended recipient(s), or if you have received this email in
error, you are asked to immediately notify the sender by telephone collect on
Australia +61 1800 198 175 or by return email. You should also delete this
email, and any copies, from your computer system network and destroy any hard
copies produced.
If not an intended recipient of this email, you must not copy, distribute or
take any action(s) that relies on it; any form of disclosure, modification,
distribution and/or publication of this email is also prohibited.
Although Queensland Health takes all reasonable steps to ensure this email does
not contain malicious software, Queensland Health does not accept
responsibility for the consequences if any person's computer inadvertently
suffers any disruption to services, loss of information, harm or is infected
with a virus, other malicious computer programme or code that may occur as a
consequence of receiving this email.
Unless stated otherwise, this email represents only the views of the sender and
not the views of the Queensland Government.
**********************************************************************************
_______________________________________________
Hl7api-devel mailing list
[email protected]<mailto:[email protected]>
https://lists.sourceforge.net/lists/listinfo/hl7api-devel
********************************************************************************
This email, including any attachments sent with it, is confidential and for the
sole use of the intended recipient(s). This confidentiality is not waived or
lost, if you receive it and you are not the intended recipient(s), or if it is
transmitted/received in error.
Any unauthorised use, alteration, disclosure, distribution or review of this
email is strictly prohibited. The information contained in this email,
including any attachment sent with it, may be subject to a statutory duty of
confidentiality if it relates to health service matters.
If you are not the intended recipient(s), or if you have received this email in
error, you are asked to immediately notify the sender by telephone collect on
Australia +61 1800 198 175 or by return email. You should also delete this
email, and any copies, from your computer system network and destroy any hard
copies produced.
If not an intended recipient of this email, you must not copy, distribute or
take any action(s) that relies on it; any form of disclosure, modification,
distribution and/or publication of this email is also prohibited.
Although Queensland Health takes all reasonable steps to ensure this email does
not contain malicious software, Queensland Health does not accept
responsibility for the consequences if any person's computer inadvertently
suffers any disruption to services, loss of information, harm or is infected
with a virus, other malicious computer programme or code that may occur as a
consequence of receiving this email.
Unless stated otherwise, this email represents only the views of the sender and
not the views of the Queensland Government.
**********************************************************************************
_______________________________________________
Hl7api-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/hl7api-devel
