Negative condition support

[chillleader]

Is your feature request related to a problem? Please describe.

As a Connector developer, I would like to be able to use the not condition when creating an element template.

Describe the solution you'd like

      "condition" : {
        "property": "method",
        "noneOf": [ "GET", "DELETE"]
      }

Describe alternatives you've considered

Regex (or client-side FEEL expression) condition support could solve this and any other future requests in this area:

    "condition": {
      "type": "regex",
      "regex": "^((?!GET|DELETE).)*$"
    }

Additional context

[nikku]

Is there a reason (beyond convenience) that you want to use noneOf instead of oneOf?

[chillleader]

This came up in the context of REST connector and the condition change bug. This could help us work around that issue as we wouldn't need to update the condition e.g. when adding a new operation or removing the body for one of HTTP methods.

Apart from that, like you said it is mostly for convenience. For instance, could be useful in the element template generator, especially the OpenAPI one, by making the resulting code a bit easier to comprehend.

[nikku]

Thanks for elaborating. We'll try to tackle the bug with higher priority then.