Thanks James,
I figured it was a problem like this...
On Thu, Jan 10, 2013 at 1:34 PM, James Agnew <ja...@jamesagnew.ca> wrote:
> Hi Steven,
>
> The model actually is- There is an ADT_Axx Java type for each HL7 message
> type, which has all of the segments in reusable Java types as well. The
> method suggested below by Laurent (and others) is taking advantage of that
> fact.
>
> The problem here is that for ADT messages, most different message triggers
> (eg. "Admit a patient" vs "discharge a patient") are defined by the HL7
> standard as having slightly different structures. For that reason you can't
> just have one Java type that meets the needs of both (unless you use the
> somewhat painful trick I described below).
>
> For that reason, you can either cast appropriately (e.g. to ADT_A01,
> ADT_A03, etc.), use other means to get access to the segment classes, which
> are reused between the various message types and give a nice "model object"
> view of the data, or use things like the HAPI Terser and Preparser, which
> look more like XPath then Java model objects.
>
> Hopefully this helps explain it a bit- The short answer I suppose is that
> HL7 v2 is an old standard which has evolved lots of quirks and baggage over
> the years, and therefore things are sometimes complex in dealing with it.
>
> Cheers,
> James
>
>
>
>
> On Thu, Jan 10, 2013 at 12:35 PM, steven touw <tou...@gmail.com> wrote:
>
>> As I mentioned - I have very little experience with this format, so this
>> may be another dumb question, but curious why the API couldn't be object
>> oriented and get this for free?
>>
>> On Thu, Jan 10, 2013 at 12:26 PM, James Agnew <ja...@jamesagnew.ca>wrote:
>>
>>> For what it's worth, I'll mention how University Health Network deals
>>> with this.
>>>
>>> We do a whole lot of ADT interfacing with one specific system, so we
>>> created an XML conformance profile using Message Workbench that contains
>>> all of the needed segments. In other words, we started with an ADT_A01
>>> structure, then added all of the missing segments in order to process all
>>> messages we need to process (MRG, the second PID in an A17, etc.). This
>>> gave us a kind of "super structure" that could be used to access any ADT
>>> message.
>>>
>>> We then use a maven plugin to translate that conformance profile into
>>> HAPI structure classes as described
>>> here<http://hl7api.sourceforge.net/conformance.html>
>>> .
>>>
>>> This way of doing things is definitely by far the most work to get set
>>> up, but once you have it set up you certainly have nice clean readable
>>> code, since you don't need parser tricks or whatever else.
>>>
>>> I should really document this whole process start to finish at some
>>> point. Maybe it would make sense to include an ADT "super structure" in the
>>> base HAPI release for just this purpose..
>>>
>>> James
>>>
>>>
>>>
>>>
>>> On Thu, Jan 10, 2013 at 9:48 AM, Carlos Oliva <carl...@pbsinet.com>wrote:
>>>
>>>> How would you examine repetitive segments with the Preparser? To carry
>>>> out a completely generic parsing, one could retrieve data with the
>>>> preparser like Christian mentioned.****
>>>>
>>>> ** **
>>>>
>>>> One problem might be with several instances of the same segment in one
>>>> message. How would you retrieve the fields from all these segments?***
>>>> *
>>>>
>>>> ** **
>>>>
>>>> *From:* steven touw [mailto:tou...@gmail.com]
>>>> *Sent:* Thursday, January 10, 2013 8:20 AM
>>>> *To:* Laurent Hasson
>>>>
>>>> *Cc:* hl7api-devel@lists.sourceforge.net
>>>> *Subject:* Re: [HAPI-devel] reading HL7 generically****
>>>>
>>>> ** **
>>>>
>>>> Thank you all, very helpful.****
>>>>
>>>> On Thu, Jan 10, 2013 at 7:55 AM, Laurent Hasson <l...@360fresh.com>
>>>> wrote:****
>>>>
>>>> This is the kind of code we have been using for that purpose:****
>>>>
>>>> ****
>>>>
>>>> try****
>>>>
>>>> {****
>>>>
>>>> _PID = new HL7PID((PID)Msg.get("PID"));****
>>>>
>>>> }****
>>>>
>>>> catch (HL7Exception E) { }****
>>>>
>>>> ****
>>>>
>>>> try****
>>>>
>>>> {****
>>>>
>>>> Segment segment = (Segment)Msg.get("PV1");****
>>>>
>>>> if (segment != null)****
>>>>
>>>> _PV = new HL7PV((PV1)segment,
>>>> (PV2)Msg.get("PV2"));****
>>>>
>>>> }****
>>>>
>>>> catch (HL7Exception E) { }****
>>>>
>>>> ****
>>>>
>>>> try****
>>>>
>>>> {****
>>>>
>>>> Structure[] Structs = Msg.getAll("DG1");****
>>>>
>>>> if (Structs != null && Structs.length > 0)****
>>>>
>>>> {****
>>>>
>>>> _DG1 = new HL7DG1[Structs.length];****
>>>>
>>>> for (int i = 0; i < Structs.length; ++i)***
>>>> *
>>>>
>>>> _DG1[i] = new HL7DG1((DG1)Structs[i]);****
>>>>
>>>> }****
>>>>
>>>> }****
>>>>
>>>> catch (HL7Exception E) { }****
>>>>
>>>> ****
>>>>
>>>> We do a few things:****
>>>>
>>>> - We have our own structures to capture the elements of a
>>>> particular message we care about (here, HL7PID, HL7DG1 etc…)****
>>>>
>>>> - We have try-catch blocks because HAPI can throw an
>>>> exception if the segment doesn’t exist.****
>>>>
>>>> ****
>>>>
>>>> This has been working ok for us. ****
>>>>
>>>> ****
>>>>
>>>> ___________________________________________________________****
>>>>
>>>> Laurent Hasson****
>>>>
>>>> Co-Founder and CTO****
>>>>
>>>> 360Fresh Inc.****
>>>>
>>>> cell: 646.283.2186****
>>>>
>>>> ****
>>>>
>>>> "Strange women lyin' in ponds distributin' swords is no basis for a
>>>> system of government" - Dennis****
>>>>
>>>> ****
>>>>
>>>> This e-mail may contain confidential and/or privileged information.
>>>> This information is intended only for the use of the individual(s) and
>>>> entity(ies) to whom it is addressed. If you are the intended recipient,
>>>> further disclosures are prohibited without proper authorization. If you are
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>>>> ****
>>>>
>>>> -----Original Message-----
>>>> From: Christian Ohr [mailto:christian....@gmail.com]
>>>> Sent: Thursday, January 10, 2013 2:58 AM
>>>> To: steven touw
>>>> Cc: hl7api-devel@lists.sourceforge.net
>>>> Subject: Re: [HAPI-devel] reading HL7 generically****
>>>>
>>>> ****
>>>>
>>>> Forgot to mention that you currently still need to include the
>>>> hapi-structure jar(s) in your classpath, depending on the HL7****
>>>>
>>>> version(s) you expect. You can also use the CanonicalModelClassFactory
>>>> with your parser, then you only need the latest structure jar.****
>>>>
>>>> In HAPI 2.1 (not released yet), you will be able to omit the structure
>>>> jars completely.****
>>>>
>>>> ****
>>>>
>>>> Christian****
>>>>
>>>> ****
>>>>
>>>> 2013/1/10 Christian Ohr <christian....@gmail.com>:****
>>>>
>>>> > In general, you don't have to cast to a specific message structure***
>>>> *
>>>>
>>>> > class: the parser returns a Message object, and you can obtain ****
>>>>
>>>> > segments using message.get("segment-name") , and from a Segment you *
>>>> ***
>>>>
>>>> > can obtain a field using segment.getField(field-number). If that's
>>>> not ****
>>>>
>>>> > generic enough, take a look at ca.uhn.hl7v2.preparser.PreParser.****
>>>>
>>>> > ****
>>>>
>>>> > cheers****
>>>>
>>>> > Christian****
>>>>
>>>> > ****
>>>>
>>>> > 2013/1/9 steven touw <tou...@gmail.com>:****
>>>>
>>>> >> Hello,****
>>>>
>>>> >> I am new to HL7 as well as it's contents. I hope this question
>>>> isn't ****
>>>>
>>>> >> too stupid.****
>>>>
>>>> >> I'm trying to read from messages generically - is there any way to *
>>>> ***
>>>>
>>>> >> grab particular segments without having to cast the Message object *
>>>> ***
>>>>
>>>> >> into ADT_A05 for example? I could have various ADT_* and trying to
>>>> ****
>>>>
>>>> >> find the best way to do this...****
>>>>
>>>> >> ****
>>>>
>>>> >> Thanks,****
>>>>
>>>> >> Steve****
>>>>
>>>> >> ****
>>>>
>>>> >> ---------------------------------------------------------------------
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>>>>
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>>>>
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>>>>
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>>>>
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>>>>
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>>
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