Testing for presence of a segment

[Marc Lang]

99% sure I've done this before and it worked...

In a source message the NK1 is repeating, and also optional.

In a DTL we need to work out if it exists of not.

I thought we could do something like:

<if condition='source.{NK1(*)}=0'>
<true>

</true>
<false>

</false>
</if>

However, when compiling this I get:

Saving DTL Diagram 'IMD.Transforms.TrakA01toIMDA01.DTL'...

Saved successfully.

Compilation started on 09/04/2012 09:27:15 with qualifiers 'cuk /checkuptodate=expandedonly'
Compiling document 'IMD.Transforms.TrakA01toIMDA01.DTL'
Compiling class IMD.Transforms.TrakA01toIMDA01
Compiling routine IMD.Transforms.TrakA01toIMDA01.1
IMD.Transforms.TrakA01toIMDA01.1.INT(15) ERROR #8: <NOLINE> : '$ZT="Trap",(tSC,tSCTrans)=1' : Offset:10 [zTransform+1^IMD.Transforms.TrakA01toIMDA01.1]
 TEXT: Set $ZT="Trap",(tSC,tSCTrans)=1 Do {
IMD.Transforms.TrakA01toIMDA01.1.INT(52) ERROR #1054: Invalid expression : '(source.GetValueAt("NK1("_(*)_")"))' : Offset:32 [zTransform+38^IMD.Transforms.TrakA01toIMDA01.1]
 TEXT: If (source.GetValueAt("NK1("_(*)_")")) {
IMD.Transforms.TrakA01toIMDA01.1.INT(54) ERROR #1053: Missing WHILE : '}' : Offset:2 [zTransform+40^IMD.Transforms.TrakA01toIMDA01.1]
 TEXT: } Else {
IMD.Transforms.TrakA01toIMDA01.1.INT(57) ERROR #1025: Expected end of line : '}' : Offset:2 [zTransform+43^IMD.Transforms.TrakA01toIMDA01.1]
 TEXT: } While 0
IMD.Transforms.TrakA01toIMDA01.1.INT(62) ERROR #1026: Invalid command : 'Exit }' : Offset:101 [Trap^IMD.Transforms.TrakA01toIMDA01.1]
 TEXT: Trap Set $ZT="", tSC=##class(Ens.Util.Error).EnsSystemError($zobjclass($this),"Transform") Goto Exit }
Detected 5 errors during compilation in 0.136s.

So looks like it doesn't like the asterisk?

I was sure I've had that working in the past.

[Anthony Beukes]

Try placing double quotes around the *:

<if condition='source.{NK1("*")}=0'>

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[Marc Lang]

That worked, thanks!

[Ted Peck]

I think it would also work with
<if condition='source.{NK1.*}=0'>

However these 2 forms can give different results for counts of group items. The form .* returns the count of all instances of the named item and their children, while the form (*) returns the count of all repetitions of the named item itself, which can be a different number.  For example using our popular sample message XYZ1.dat, I get these two results:

ENSDEMO>w h.GetValueAt("IN1grp(*)",,.sc)
3
ENSDEMO>w h.GetValueAt("IN1grp.*",,.sc)
6

That's because in this sample message each instance of IN1grp contains an IN1 and an IN2.

Ted

[Marc Lang]

This works good for repeating segments - but how to test if a single non-repeating segment exists?

the count always returns 0?

[Peter Hunter]

Try this for non-repeating segments

<if condition='source.{PV1}&apos;=""'>

That worked, thanks!

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