Varialbe Substitution in Multimapping

Question

Hi,
We are trying to use variable substitution for generating multiple files at the target. Our XI Version is XI 3.0 SP 15.
My Source Structure is
P_MT_multimapping  1..1      -
>(MessageTypeName)                                                   
        source              0..unbound
           A                  0..1
           B                  0..1
           C                  0..1
           D                  0..1
and
My Target Structure is
PMTmultimapping   0..unbound    -
>(MessageTypeName)
    Target                0..unbound
         A                  1..1
         B                  1..1
         C                  1..1
         D                  1..1
   filename1             0..unbound
        filename1        1..1
My  Requirement is to generate a new file for each unique value of  'B'  from the source and for a particualr file multiple records should be generated for each unique value of 'A' from the source. And target field 'filename1' should be incremented by 1 for each file. For example
My source payload is:
   <?xml version="1.0" encoding="UTF-8"?>
<ns0:Messages xmlns:ns0="http://sap.com/xi/XI/SplitAndMerge">
   <ns0:Message1>
      <ns1:P_MT_multimapping xmlns:ns1="http://infosys.com/xi/projects/bp/n1">
         <Source>
            <A>1</A>
            <B>KJ</B>
            <C>1</C>
            <D>1</D>
         </Source>
         <Source>
            <A>1</A>
            <B>KH</B>
            <C>1</C>
            <D>1</D>
         </Source>
         <Source>
            <A>1</A>
            <B>KK</B>
            <C>1</C>
            <D>1</D>
         </Source>
         <Source>
            <A>1</A>
            <B>KL</B>
            <C>1</C>
            <D>1</D>
         </Source>
         <Source>
            <A>2</A>
            <B>KL</B>
            <C>1</C>
            <D>1</D>
         </Source>
         <Source>
            <A>2</A>
            <B>KK</B>
            <C>1</C>
            <D>1</D>
         </Source>
      </ns1:P_MT_multimapping>
   </ns0:Message1>
</ns0:Messages>
And generated target payload:
  <?xml version="1.0" encoding="UTF-8"?>
<ns0:Messages xmlns:ns0="http://sap.com/xi/XI/SplitAndMerge">
   <ns0:Message1>
      <ns1:PMTmultimapping xmlns:ns1="http://infosys.com/xi/projects/bp/n1">
         <Target>
            <A>1</A>
            <B>KH</B>
            <C>1</C>
            <D>1</D>
         </Target>
         <filename1>
            <filename1>1</filename1>
         </filename1>
      </ns1:PMTmultimapping>
      <ns1:PMTmultimapping xmlns:ns1="http://infosys.com/xi/projects/bp/n1">
         <Target>
            <A>1</A>
            <B>KJ</B>
            <C>1</C>
            <D>1</D>
         </Target>
         <filename1>
            <filename1>2</filename1>
         </filename1>
      </ns1:PMTmultimapping>
      <ns1:PMTmultimapping xmlns:ns1="http://infosys.com/xi/projects/bp/n1">
         <Target>
            <A>1</A>
            <B>KK</B>
            <C>1</C>
            <D>1</D>
         </Target>
         <Target>
            <A>2</A>
            <B>KK</B>
            <C>1</C>
            <D>1</D>
         </Target>
         <filename1>
            <filename1>3</filename1>
         </filename1>
      </ns1:PMTmultimapping>
      <ns1:PMTmultimapping xmlns:ns1="http://infosys.com/xi/projects/bp/n1">
         <Target>
            <A>1</A>
            <B>KL</B>
            <C>1</C>
            <D>1</D>
         </Target>
         <Target>
            <A>2</A>
            <B>KL</B>
            <C>1</C>
            <D>1</D>
         </Target>
         <filename1>
            <filename1>4</filename1>
         </filename1>
      </ns1:PMTmultimapping>
   </ns0:Message1>
</ns0:Messages>
I want to pick the filename from field 'filename1'. I used only single communication channel
My channel has the following variable substitution
    payload:PMTmultimapping,1,filename1,1,filename1,1
the value for filename1 is set to "var"
  I use NFS and write the target file as :     file%var%sant.xml
This creates only one file at the target directory with the file name 'file1sant.xml'.
but I want to generate multiple files for the above.
Any pointers on How to Fix this.
Regards,
Abhishek.

Answer 1

Abhishek:
After I read your post, you have a couple of requirments.
But I do not know which part you came cross problem.
On Mapping, or get the file name ?
Anyway, my thoughts:
On Mapping part:
req 1: generate a new file for each unique value of 'B' from the source :
  B->Removecontext->PMTmultimapping
req 2: for a particualr file multiple records should be generated for each unique value of 'A' from the source
  A->reomveContext->sort->SplitByValue[Value Change]->CollapsContext--> %YourMultipleRecords%
req 3:  And target field 'filename1' should be incremented by 1 for each file
You can come up an UDF by using sample code below to get the file name from source side:
DynamicConfiguration conf = (DynamicConfiguration) container
.getTransformationParameters()
.get(StreamTransformationConstants.DYNAMIC_CONFIGURATION);
DynamicConfigurationKey key= DynamicConfigurationKey.create (
"http://sap.com/xi/XI/System/File","Filename");
conf.put(key,fname);
return " ";
  Your file counter can be passed by using index standard function
Then you concate your filename and index to your final filename.
Regards.
Liang