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
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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
<mailto: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 <mailto: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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