feat: add Kotlin model generator

[LouisXhaferi]

This PR deals with adding support for Kotlin.

Todos:

• Copy, Rename & Replace stuff in and from tepmplate files
• Add generator to generators index file
• Adapt logic & implement basic functionality
• Use inline classes doesn't make sense in this context, also unnecessary performance optimization
• Add Constraint Validation
• Ensure that Classes can be compiled
• Jackson Integration Not needed, Kotlin interop good enough
• Add relevant reserved keywords to constants
• Add mocked renderer
• Testing
  • Test constrainer
  • Test restrained keywords
  • Test typemapping
  • Test presets
  • Test renderer
  • Add examples
• Add FileGenerators test
• Add Blackbox Tests
• Doc
  • Add to main README
  • Add to list of generators
  • Add language specific Doc
• Cleanup

For all steps, see contributing.md

Resolves #1073

[github-actions]

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[LouisXhaferi]

I'm pushing a bunch of malformed commit messages in here, I'll squash anything but the first chore commit once I'm done

[LouisXhaferi]

One thing I'm not familiar with or quite so sure of is the whole __snapshots__ part during testing.

I suppose it's a regression testing thing? But who generates the snapshots the first time and what do I really test against?
I'll figure it out tomorrow.

[jonaslagoni]

I'm pushing a bunch of malformed commit messages in here, I'll squash anything but the first chore commit once I'm done

There are no specific format for commit messages in your local branch, everything is squashed when merged into next, so you have total freedom here🙂

One thing I'm not familiar with or quite so sure of is the whole __snapshots__ part during testing.

I suppose it's a regression testing thing? But who generates the snapshots the first time and what do I really test against? I'll figure it out tomorrow.

They are generated by the testing framework Jest, and can be updated by running the script npm run test:update, which will then update any non-matching snapshots with new expected results.

modelina/test/generators/java/JavaGenerator.spec.ts

Line 50 in 9e3a823

expect(models[0].result).toMatchSnapshot();

It is used instead of relying on using something like the following:

    expect(models[0].result).toEqual(expectedResult);

Which just makes it easier to work with then having to manually change the expected values 🙂

[sonarcloud]

Please retry analysis of this Pull-Request directly on SonarCloud.

[LouisXhaferi]

My roadmap to completing this PR:
Constraint Validation Preset -> Test Annotation Renderer -> Test Presets -> Create Doc

Apart from that it seems to be working at this point.
Blackbox tests are passing, code can be compiled, unit test and examples passing.

Code probably needs a bit of care before I can complete this, since some parts are still copies, but all in all, this is nearly done.

P.S.:
Sorry for taking so long. I would have liked to be done with this last week.

[jonaslagoni]

In case you wanted to become a champion for Kotlin, remember add yourself to the codeowners file by adding the following:

# Language Champions for Kotlin and it's presets
*/generators/kotlin @LouisXhaferi 

[LouisXhaferi]

In case you wanted to become a champion for Kotlin, remember add yourself to the codeowners file by adding the following:

# Language Champions for Kotlin and it's presets
*/generators/kotlin @LouisXhaferi 

Yes, I will gladly be the champion for Kotlin (and join the TSC if that is part of it 🙏🏻 ) as a employee of Mercedes-Benz Tech Innovation 💪🏻
(I think we're even like a Linux Foundation Silver backer, which is pretty cool imo)

I'll do the following things this afternoon:

• fix compilation error
• exclude windows
• open issue about windows not working and being excluded
• add myself to CODEOWNERS for Kotlin

[LouisXhaferi]

I have not found out why the windows runner would use the native compiler so far.

I checked out the Installer script, which looks fine and seems to install the correct version....

Since I have no idea where it goes wrong, I haven't opener an Issue yet.
I hope I'll find out later, otherwise I'll temporarily open one in this repo.

[LouisXhaferi]

Aaah I need to do one more thing: install kotlin in the docker image

[jonaslagoni]

I hope I'll find out later, otherwise I'll temporarily open one in this repo.

Temporary issue is all good, you can clarify it later once you figure it out 👍

[LouisXhaferi]

I think.... I'm all done

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[jonaslagoni]

LGTM 🔥 Well done 💪

I will invite you on as a collaborator, so please check your invites/email. You can then add yourself to the TSC in the community repository, you can use this PR as guideline: asyncapi/community#570

If you encounter any problem just reach out 😄

@magicmatatjahu @Samridhi-98 @ron-debajyoti @leigh-johnson pinging you to let you know the Modelina family grows 😊

[jonaslagoni]

/rtm

[asyncapi-bot]

🎉 This PR is included in version 1.0.0-next.41 🎉

The release is available on:

• npm package (@next dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[jonaslagoni]

@all-contributors please add @LouisXhaferi for code, test, doc, example, maintenance.

[allcontributors]

@jonaslagoni

I've put up a pull request to add @LouisXhaferi! 🎉

[LouisXhaferi]

LGTM 🔥 Well done 💪

I will invite you on as a collaborator, so please check your invites/email. You can then add yourself to the TSC in the community repository, you can use this PR as guideline: asyncapi/community#570

If you encounter any problem just reach out 😄

@magicmatatjahu @Samridhi-98 @ron-debajyoti @leigh-johnson pinging you to let you know the Modelina family grows 😊

Thank you for accompanying and supporting me through my first issue and pr here 💪🏻