UDF in mesage mapping.

Question

Hi
I am trying to create a message mapping where the input and output messages are as follows.
Input:
<MT_Request >(1..1)
   <ItemData>(1..1)
      <Item>(0..unbounded)
         <Invoice/>(1..1)
         <TaxCode/>(1..1)
      </Item>
   </ItemData>
   <TaxData>(0..1)
      <Tax>(0..unbounded)
         <TaxCode/>(1..1)
         <TaxIndetifier/>(1..1)
         <TaxAmt/>(1..1)
      </Tax>
   </TaxData>
</MT_Request>
Output:
<MT_Response>(1..1)
   <Response>(1..1)
      <ResponseData>(0..unbounded)
         <Invoice/>(1..1)
         <ServiceTax/>(1..1)
       </ResponseData>
   </Response>
</MT_Response>
The mapping as follows
Invoice --> Invoice
If {(TaxCode in Item = TaxCode in TaxData) and
TaxIndetifier = constant value like A}
ServiceTax = TaxAmt
Here the Item Tag in request message is repeated as well as Tax Tag. So for each TaxCode under Item Tag, the programme should go and check all theTaxTag for the same Taxcode. If the values are same, then Taxfinder check will be done and then the TaxAmt value will be put in ServiceTax.Is there any way to do this by UDF???
Also please tell me when we are taking a parent node with child nodes (like TAX) and giving that as an argument to the UDF as a string array, what values will come inside the array???
regards,
Biranchi

Answer 1

Hi Biranchi,
You can try like this
input to UDF will be Item tag,Tax Code, Tax Data , Tax_Identifier and Tax_amt and create three arguments in UDF in context mode with same names,the UDF will look like
for(int i=0;i<item.length;i++)
  if( Tax_Code<i>.equals(Tax_Data<i>) && Tax_Identifier<i>.equals("A"))
result.addValue(""+Tax_amt<i>);
Correct if there is any context problem.Target will be Service Tax.
Thanks!