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Temporary Variables in Mapping node

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sridhsri

Posted: Fri Jul 04, 2008 8:54 am Post subject: Temporary Variables in Mapping node

Master

Joined: 19 Jun 2008
Posts: 297

I have an incoming message with an element that has an unbounded occurrence. From this message based on certain conditions on these elements, I need to generate the output message. The header of the output message must contain the number of elements that were created in the output.

1) I can only use the mapping node
2) The header must contain the number of records in the message

I know it can be done with two mapping nodes. But I am trying to see if it can be done with one mapping node and no calling esql or java from mapping.

The problem
1) How to fill the header record last although it appears first in the MRM ?
2) How can you use temporary variables (including localenvironment) as an counter to count the number of output items ?

Gemz

Posted: Fri Jul 04, 2008 9:10 am Post subject:

Centurion

Joined: 14 Jan 2008
Posts: 124

Do you mean you want to count the number of records in the message.

Can you please post a sample message?

Thanks

sridhsri

Posted: Fri Jul 04, 2008 9:20 am Post subject:

Master

Joined: 19 Jun 2008
Posts: 297

Yes. I want to count the number of records that will be generated in the output. This count is also part of the outgoing message.

Incoming Message:

<Root>
<Elem1></Elem1>
<Elem1></Elem1>
<Elem1></Elem1>
<Elem1></Elem1>
.
.
.
</Root>

Outgoing Message:

Header: 4
Elem1: ...
Elem1: ...
Elem1: ...
Elem1: ...

sridhsri

Posted: Fri Jul 04, 2008 9:21 am Post subject:

Master

Joined: 19 Jun 2008
Posts: 297

PS: Not all incoming <Elem1> elements need to be present in the output. It will be based on some condition.

Gemz

Posted: Fri Jul 04, 2008 9:33 am Post subject:

Centurion

Joined: 14 Jan 2008
Posts: 124

You can achieve this using 'fn:count()' method in the mapping node.

i.e. set 'fn:count($source/Root/Elem1)' in the Header field of the mapping node.
Now Header will hav the number of 'Elem1' elements in the input.

sridhsri

Posted: Fri Jul 04, 2008 9:36 am Post subject:

Master

Joined: 19 Jun 2008
Posts: 297

I don't think that will work. count() will only work on the source - as you pointed out. I am not interested in the number of incoming "elem1" elements. I am interested in the count of outgoing "elem1" elements.

PeterPotkay

Posted: Fri Jul 04, 2008 9:57 am Post subject:

Poobah

Joined: 15 May 2001
Posts: 7722

Moved to WMB Forum
_________________
Peter Potkay
Keep Calm and MQ On

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