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| variable body |
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| scravr |
 Posted: Fri Dec 19, 2008 5:23 am Post subject: variable body |
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Partisan
Joined: 03 Apr 2003
Posts: 391
Location: NY NY USA 10021
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I have this msg format: Header (fix length) + Body (variable length) + Trailer (fix length):
Header: fieldA, fieldB, fieldc = 50 bytes fix leng.
Body: up to 20 times of:
fieldX: 1 byte (must be “X” ) + fieldY: 50 bytes (string text - can have X char in it).
That means body can have 0, 51, 102, 153…..up to 1020 bytes.
Trailer: fieldZ 200 byes string text.
There is no indication for msg length nor for how many times body repeated.
Any ideas on how to build msg-set?
Should it be BINARY or TDS?
How to build body? As a Group and then Type on group? |
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| Vitor |
| Posted: Fri Dec 19, 2008 5:27 am Post subject: Re: variable body |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| scravr wrote: |
| There is no indication for msg length nor for how many times body repeated. |
So how, in a non-WMB sense, is the message modeled? How would a C or a COBOL program determine the number of repeats of your field Y? Is it simply (total message length - 250) divided by 51?
_________________
Honesty is the best policy.
Insanity is the best defence. |
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| scravr |
| Posted: Fri Dec 19, 2008 5:55 am Post subject: variable body |
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Partisan
Joined: 03 Apr 2003
Posts: 391
Location: NY NY USA 10021
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Sorry, I left this out:
If body fieldX in positions 1, 51, 102, …. contains “X”, that means this is a body fieldX+ fieldY combination. That means we need to search for “X” every 50 bytes upto 20 times.
If it is not “X” that means it’s the begging on trailer.
In other words, Trailer starts/located on first time we do not find “X” on that position. |
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| kimbert |
| Posted: Mon Dec 22, 2008 3:01 am Post subject: |
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Jedi Council
Joined: 29 Jul 2003
Posts: 5542
Location: Southampton
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Hi scravr,
Your message format contains tags ( the 'X's ) so you need a Tagged Delimited String ( TDS ) physical format.
Your message model should look like this ( not tested):
| Code: |
Message
ComplexType DataElementSeparation="Use Data Pattern", Composition="Sequence"
Element name="Header", minOccurs="1", maxOccurs="1", Data Pattern=".*{50}"
ComplexType DataElementSeparation="Fixed Length", Composition="Sequence"
header field 1
header field 2
...
Element Name="Body", minOccurs="0", maxOccurs="20", Data Pattern="X.*{50}",
ComplexType DataElementSeparation="Fixed Length", Composition="Sequence"
body field 1
body field 2
...
Element name="Trailer", minOccurs="1", maxOccurs="1", Data Pattern=".*{200}"
ComplexType DataElementSeparation="Fixed Length", Composition="Sequence"
trailer field 1
trailer field 2
... |
If it doesn't parse successfully, apply the golden rules of parser debugging:
- disconnect the debugger
- insert a Trace node after the input node with pattern '${Root}'
- take a user trace ( debug-level ) |
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| scravr |
| Posted: Mon Dec 22, 2008 5:57 am Post subject: |
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Partisan
Joined: 03 Apr 2003
Posts: 391
Location: NY NY USA 10021
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Looking in few test data saples, the requirement changed:
The up to 20 "X" can be either one of "X", "N", or "O".
Basicaly the body repeat TAG can be either X or N or O.
The trailer is VARIABLE LENGTH and can be 0 UP TO 200 bytes (most of times is shorter tahn 200).
When working with TDS, it requires "repeating element delimiter" ??? |
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| scravr |
| Posted: Mon Dec 22, 2008 5:58 am Post subject: Variable body |
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Partisan
Joined: 03 Apr 2003
Posts: 391
Location: NY NY USA 10021
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Looking in few test data saples, the requirement changed:
The body 20 "X" can be either one of "X", "N", or "O".
Basicaly the body repeat "TAG" can be either X or N or O.
The trailer is VARIABLE LENGTH and can be 0 UP TO 200 bytes (most of times is shorter tahn 200).
When working with TDS, it requires "repeating element delimiter" ??? |
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| kimbert |
| Posted: Mon Dec 22, 2008 1:11 pm Post subject: |
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Jedi Council
Joined: 29 Jul 2003
Posts: 5542
Location: Southampton
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| Quote: |
| The body 20 "X" can be either one of "X", "N", or "O". |
Just change X to [XNO] in the data pattern
| Quote: |
| When working with TDS, it requires "repeating element delimiter" ? |
Only if you are using delimiters. Your data is fixed-length. |
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| scravr |
| Posted: Tue Dec 23, 2008 5:56 am Post subject: variable body |
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Partisan
Joined: 03 Apr 2003
Posts: 391
Location: NY NY USA 10021
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I created a ComplexType as UserDataPattern, and in it:
1. ElementRefrences to present Header fields; All these global elements are UDP
2. For body, created LocalElement (in the main ComplexType) as a LocalComplexType Min/Max occurs 2/20 with UDP .{0,51} This body LocalComplexType points to GroupReference with UPD Min/Max occurs 1/1.
The group is defined as UDP with 2 local elements:
1st as string length=1, Min/Max occurs 1/1 and UDP as .
2nd as string length=50, Min/Max occurs 1/1 and UDP as .{0,50}
3. For trailer I put (in the main ComplexType) ElementRefrence Min/Max occurs 0/1 to a global element string length=200 with UDP .* (since trailer can be up to 200 bytes)
In other words, Header is fix-length (build up from few fields), body is variable length (repeat of 1+50) occurs min/max 2/20, and trailer upto 200 bytes.
When running/debugging I see the trailer data is parsed as body !!!
That means repetition of body goes beyond 20 times !!!
No data is left for trailer.
Any ideas? |
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| kimbert |
| Posted: Thu Jan 01, 2009 4:36 pm Post subject: |
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Jedi Council
Joined: 29 Jul 2003
Posts: 5542
Location: Southampton
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| Quote: |
| When running/debugging I see the trailer data is parsed as body !!! |
Please re-read all of my previous posts, and do what they suggest. |
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