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| Using DFDL to create a structure |
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| gfrench |
 Posted: Tue Nov 21, 2023 2:32 am Post subject: Using DFDL to create a structure |
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Acolyte
Joined: 10 Feb 2002
Posts: 71
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I have a simple DFDL and which has a sequence
ACK_Indicator, 1 character string, either a '0' or '1'
Choice (choice dispatch key ACK_Indicator)
ACK string, fixed value 'ACK' (choice branch key 0)
NACK. string, fixed value 'NACK' (choice branch key 1)
I want to use this to build a structure, that if I set the ACK_Indicator = 0 I get the ACK element and if I set ACK_Indicator = 1 I get the NACK element
When I use Choice Dispatch Key set to point to the ACK_Indicator it seems it correctly parses either the ACK or NACK elements correctly based on the Choice Branch
When constructing a message it works and dynamically creates the ACK when I set 0 but not for NACK. If I put the NACK element above the ACK it works for NACK and not ACK.
Does Choice Dispatch Key only work for parsing?
Second question, is can i dynamically create a time field with the CURRENT_TIMESTAMP in it?
I think I am going to have to resort to ESQL, but thought I would just check if someone has more experience of DFDL, as documentation is a little sketchy.
Thanks |
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| timber |
| Posted: Wed Nov 22, 2023 4:30 am Post subject: |
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Grand Master
Joined: 25 Aug 2015
Posts: 1280
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Would you mind supplying an example input document and the resulting message tree?
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| Does Choice Dispatch Key only work for parsing? |
Correct - as far as I remember, it's an optimisation for parsing only. When writing, you need to use outputValueCalc to calculate the value of the ACK_Indicator field based on the contents of the message tree.
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| can i dynamically create a time field with the CURRENT_TIMESTAMP in it? |
Where do you want to create it? Obviously, you can easily create a field in the message tree and set its value using CURRENT_TIMESTAMP. But you probably know that already  |
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| gfrench |
| Posted: Fri Nov 24, 2023 7:00 am Post subject: |
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Acolyte
Joined: 10 Feb 2002
Posts: 71
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Sorry for slow reply..and thanks for response
I will play around and see if I can work out how to use OutputValueCalc.
The date I wanted to create as a default value in the output from the DFDL.
Basically I have a fixed length field structure (used comma below easier to demo it) which I need to build and add into an XML field. Some fields can be defaulted, some fields need setting. I could just set OutputRoot.XMLSC...myfield = 'ACK,00,20231124', however the structure has a few more fields so I would like to set just the second field 00, then bitstream the DFDL to defult the other values. If 00 then ACK, if 01 then NACK.
I think DFDL works better at parsing than constructing, but will play around some more. thanks |
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