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How to convert JSON into TTCN-3 [message #1805793]

Wed, 24 April 2019 08:18

Yann Garcia

Messages: 145
Registered: June 2016

Senior Member

Hello,

I'm involve in some Multi-access Edge Computing (MEC) projects and there are a lot of JSON files I would like to convert in to TTCN-3 types modules.

I read all the threads regarding TITAN and JSON, but I didn't find such tool or compiler options to achieve my goals.

Please can you provide me some hint to do this JSON to TTCN-3 conversion?

Many thanks in advance for your help,

Best Regards,

Yann

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Re: How to convert JSON into TTCN-3 [message #1805840 is a reply to message #1805793]

Thu, 25 April 2019 09:15

Elemer Lelik

Messages: 1120
Registered: January 2015

Senior Member

Hi Yann,

currently there is no support in Titan to automate JSON to TTCN-3 conversion;
there is for the opposite direction though , which is probably more complex.

A conversion can be done manually, as described in the (simplistic) example
Using JSON in TTCN-3 and Titan Part I: Testing REST / JSON web services
https://www.eclipse.org/forums/index.php/t/1068704/

The recommended workflow is:

-The JSON document has to be found a JSON schema that covers it
-a TTCN3 type equivalent to this schema has to be found
-this type than can be used for variables that can be JSON encoded

Now probably this sounds more complicated than it really is .

JSON has only seven basic types:

-JSON Strings can be converted to TTCN-3 charstring or universal charstring
-JSON Numbers to TTCN-3 integers or float
-JSON Objects to TTCN-3 records or sets
-JSON Arrays to TTCN-3 arrays
-JSON boolean to TTCN-3 boolean
-JSON Null to the ASN.1 Null that can be imported into TTCN-3

JSON-Generic-Null-Def
DEFINITIONS ::=  BEGIN
  
  IMPORTS;
  
  JSON-null-type ::= NULL

END

The principles of TTCN-3 to JSON conversion are described in
the refguide
4.26.4. Converting TTCN-3 and ASN.1 types to a JSON schema

their inverse can be easily applied.

So one has to assemble the TTCN-3 equivalent, including the encoding variants, of the JSON documents to be converted. Once you have done one or two examples it should come naturally.

Of course the alternative is to write a script that does this automatically
but so far we did not find this justifiable.

Best regards
Elemer

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