Eclipse Community Forums: VIATRA » ViatraQuery

Help

Home

Home » Modeling » VIATRA » ViatraQuery - API Headless(Generic API without generating code)

Show: Today's Messages :: Show Polls :: Message Navigator

ViatraQuery - API Headless [message #1816856]

Fri, 08 November 2019 14:40

Julian Barthel

Messages: 6
Registered: November 2019
Location: Germany

Junior Member

Hi,

for a project I want to transfer patterns from another (meta)modelling tool in Viatra to get matches from it. Instead of translate these patterns in your specific .vql-File and then to use the generated code to get matches back, I want to ask if there is another way to do it? Maybe something like a headless mode without generating Java code?

I searched a little bit the forum and found something similar (https://www.eclipse.org/forums/index.php/m/1760314/?srch=headless#msg_1760314), where someone tried to use the generic API to use his patterns without generating code. One answer was that there is an headless example (http://git.eclipse.org/c/viatra/org.eclipse.viatra.examples.git/tree/query/headless), but since the post is more than two years old I was wondering if this is still up to date or even fits to my problem.

Regards,

Julian

Report message to a moderator

Re: ViatraQuery - API Headless [message #1817098 is a reply to message #1816856]

Fri, 15 November 2019 14:14

Abel Hegedus

Messages: 197
Registered: September 2015

Senior Member

HI,

there is a section in the documentation that provides up-to-date example code for parsing VQL textual definition and retrieve query specification objects to get matches: https://www.eclipse.org/viatra/documentation/query-api.html

Let us know if you need further details.

Report message to a moderator

Re: ViatraQuery - API Headless [message #1817122 is a reply to message #1817098]

Fri, 15 November 2019 17:19

Zoltan Ujhelyi

Messages: 392
Registered: July 2015

Senior Member

Hi Julian,

in addition to the entry Ábel mentioned, we are working on a PatternParser API that should make it easier to parse and process queries. Sadly, we have not yet provided documentation for the feature, but we have an example code using it to parse query specifications stored in MagicDraw UML models [1].

Some documentation is planned in the future, but in the meantime, feel free to ask about it if it is unclear.

Best regards,
Zoltán

[1] https://github.com/IncQueryLabs/MD_plugin_skeleton/blob/master/com.incquerylabs.magicdraw.plugin.example/src/main/java/com/incquerylabs/magicdraw/plugin/example/codegen/CodegenPatternLoader.java#L63

Report message to a moderator

Re: ViatraQuery - API Headless [message #1818454 is a reply to message #1817122]

Mon, 16 December 2019 15:17

Julian Barthel

Messages: 6
Registered: November 2019
Location: Germany

Junior Member

First of all thank you very much for your reply,

i looked up the code from the MagicDraw UML Models you provided. How i understood it, is that you need a VQL-File to get it working. The problem is i decided to get the step with generating Java Code from Viatra but i dont want to build a VQL-File , so i know want to ask if it is possible in Viatra to manually trigger the Java code-generation (which normally the runtime API does out of a VQL-File) only with specific objects from org.eclipse.viatra.query.patternlanguage.emf.vql (like Pattern, PatternBody, Annotations ...) ? If this is the case a little example like the MagicDraw UML Models would be very helpful for me.

Best regards,
Julian

Report message to a moderator

Re: ViatraQuery - API Headless [message #1818490 is a reply to message #1818454]

Tue, 17 December 2019 10:54

Zoltan Ujhelyi

Messages: 392
Registered: July 2015

Senior Member

Hi Julian,

it seems I have already created an example, only it was not included yet into the documentation about the PatternParser API: https://git.eclipse.org/c/viatra/org.eclipse.viatra.git/tree/documentation/org.eclipse.viatra.documentation.example/src/org/eclipse/viatra/documentation/example/ViatraQueryHeadless.java#n78

The idea is that you can provide your query definitions as a String and create pattern matchers from them that can be processed without relying at the code generator infrastructure in general. Can you check whether the linked example describes what you want to achieve?

Best regards,
Zoltán

Report message to a moderator

Re: ViatraQuery - API Headless [message #1818559 is a reply to message #1818490]

Thu, 19 December 2019 15:19

Julian Barthel

Messages: 6
Registered: November 2019
Location: Germany

Junior Member

Hi Zoltán,

thank you for your fast reply. Your code example helped me a lot and make thinks much easier for me. I can now continue with my project .
I wish you and the Vitra Team happy holidays.

Best regards,
Julian

Report message to a moderator

Previous Topic:	How to add dependencies to vql files
Next Topic:	Small Tutorial Bug: HostInstance with empty IP address

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

]

Current Time: Sat Jun 03 11:35:04 GMT 2023

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter