Re: [HAPI-devel] HAPI-openadaptor integration

[<fre...@sk...>]

Tripp, Bryan a =E9crit :

>Hi Fr=E9d=E9ric,=20
>
>Thank you, that's a very nice introduction to openadaptor. =20
>
>The only part I didn't understand was what underlies the XML element
>MapToHL7.  Did you write that component or is it part of openadaptor?  W=
here
>does the Terser-like syntax come from?=20
>
MapToHL7 is an AliasingPipeSegment component, which is described at=20
http://openadaptor.openadaptor.org/pg/transforming_components.htm#Aliasin=
g.=20
In fact, I don't use the standard class provided by *openadaptor* but a=20
slightly modified version. But it is pure openadaptor code, not related=20
to HL7 at all. The objective is to transform a dataobject from one=20
structure to another.

In my previous example, MapToHL7 transforms each dataobject built from=20
the SQL result set, for instance:

<Admission>
  <patientID>M07869D</patientID>
  <firstName>FREDERIC</firstName>
  <lastName>DUBRU</lastName>
  <sex>M</sex>
  <birthDate>1970-10-04T00:00:00 @Europe/Paris</birthDate>
  ...
</Admission>

into another dataobject with a HL7-like structure:

<ADT_A01>
  <PID>
    <PID_2>M07869D</PID_2>
    <PID_5>
      <PID_5_1>DUBRU</PID_5_1>
      <PID_5_2>FREDERIC</PID_5_2>
    </PID_5>
    <PID_7>1970-10-04T00:00:00 @Europe/Paris</PID_7>
    <PID_8>M</PID_8>
    ...
  </PID>
  ...
</ADT_A01>

This XML piece is only the XML representation of  the transformed=20
dataobject; it's not HAPI XML.

Then, the HL7StringWriter encodes this dataobject into an HL7 message,=20
with the following pseudo-code, using the HAPI classes:

Instantiate an Message after the name of the dataobject type (ADT_A01)
For each attribute (nested dataobject) of this dataobject (EVN, PID, PV1).
  Create a Segment after the name of this attribute
  For each attribute of this nested dataobject (PID_2, PID_5, etc.)
  Create a Type after the index in the name of this attribute
  If it is a simple attribute
    Set the value of this attribute into this primitive type
  Else if it is a composite attribute (nested dataobject)
    For each attribute of this nested dataobject (PID_5_1, PID_5_2, etc.)
       ...
Create or complete the MSH segment
Encode the message

Surely it would have been easier to use a Terser, rather than build all=20
the HAPI structures by hand, but the Terser didn't exist yet at the time=20
I wrote the code.

Fr=E9d=E9ric