Re: [HAPI-devel] [newbie] casting incoming message to the right type

Fri, 16 Mar 2012 13:39:57 -0700 

I created simple wrapper classes around message types and do the following:

    public HL7MSH(Message Msg)
    throws DataTypeException, HL7Exception
      {
        _Msh = (MSH) Msg.get("MSH");
        _Version = _Msh.getVersionID().getVersionID().getValue();
_Code = _Msh.getMsh9_MessageType().getMsg1_MessageCode().getValue(); _Type = _Msh.getMsh9_MessageType().getMsg2_TriggerEvent().getValue(); _Time = _Msh.getDateTimeOfMessage().getValueAsCalendar() == null ? null : new HL7DTM(_Msh.getDateTimeOfMessage())._Cal; 
        _Id   = _Msh.getMessageControlID().getValue();
      }
This is the constructor to my HL7MSH wrapper object. Then in the main code, i do like this 

       HL7MSH Msh = new HL7MSH(Msg);
       if (Msh._Code.equals("ADT") == false)
return new ADTRecord(Msh, Msg, "HL7Message Error: This is not an ADT Message (it's a "+Msh._Code+"). Message won't be processed."); ADTRecord ADT = (Msh._Type.equals("A01") == true) ? (ADTRecord) new ADT01or04or08Record(Msh, Msg) : (Msh._Type.equals("A02") == true) ? (ADTRecord) new ADT02Record(Msh, Msg) : (Msh._Type.equals("A03") == true) ? (ADTRecord) new ADT03Record(Msh, Msg) : (Msh._Type.equals("A04") == true) ? (ADTRecord) new ADT01or04or08Record(Msh, Msg) : (Msh._Type.equals("A05") == true) ? (ADTRecord) new ADT05or28or31Record(Msh, Msg) : (Msh._Type.equals("A06") == true) ? (ADTRecord) new ADT06or07Record(Msh, Msg) : (Msh._Type.equals("A07") == true) ? (ADTRecord) new ADT06or07Record(Msh, Msg) : (Msh._Type.equals("A08") == true) ? (ADTRecord) new ADT01or04or08Record(Msh, Msg) : (Msh._Type.equals("A28") == true) ? (ADTRecord) new ADT05or28or31Record(Msh, Msg) : (Msh._Type.equals("A31") == true) ? (ADTRecord) new ADT05or28or31Record(Msh, Msg) : new ADTRecord(Msh, Msg, "HL7Message Error: This is not a supported ADT A01-A08, A28 or A31 message (it's a "+Msh._Type+"). Message won't be processed.");
Obviously, i am calling my own wrapper classes here, but essentially, i get the code and type of any incoming message and route accordingly to process. 


Hope this helps a bit.


------------------------------------------------------------------------
*Laurent (Harry) Hasson*
Co-Founder, 360Fresh.com <https://360Fresh.com>


On 3/16/2012 04:14, Gabriel Euzet wrote:

Hi Sanjay,

I have the same problem.
ca.uhn.hl7v2.model.Message has no method to get the MSH segment until
you cast it to ADT_A01 ...

I found 3 ways to identify the message type :
  * use reflection to invoke getMSH(), again to invoke
getMessageType(), and again for methods getMessageStructure() and
getTriggerEvent().
  * use Terser :
                Terser t = new Terser(message);
                String triggerEvent = t.get("/MSH-9-2");
                String messageStructure = t.get("/MSH-9-3");

Then you just need to write a long list of if(
"ADT....".equals(messageStructure) ) .....

  * write the long list of if( message instance of ADT_...) ...

Hope it helps
Gabriel

2012/3/15 Sanjay Bhandari<san...@ziffusion.com>:

I'm trying to figure out what is the normal way of casting a incoming
message to the appropriate type.

Specifically, if I register for messages with:

server.registerApplication("*", "*", handler);


I see the following:

MSH ->  getMESSAGETYPE() ->  getMessageType() ->   getValue()

Is this what I switch on, and cast? Or is there another preferred way?

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