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https://issues.apache.org/jira/browse/MINIFICPP-985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16892857#comment-16892857
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Arpad Boda commented on MINIFICPP-985:
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Not different ones, but being able to set multiple of one type. 

A list of integers, a list of strings (which is a multichoice thing), etc. 

Libkafka processor is a good example, where you have the possibility to set any 
or many of options A, B and C.

To use allowable values all possible combinations should be generated and added 
as an allowable value, which would be a nightmare in C2 communication. 

> Implement listvalidators
> ------------------------
>
>                 Key: MINIFICPP-985
>                 URL: https://issues.apache.org/jira/browse/MINIFICPP-985
>             Project: Apache NiFi MiNiFi C++
>          Issue Type: New Feature
>    Affects Versions: 0.6.0
>            Reporter: Arpad Boda
>            Assignee: Arpad Boda
>            Priority: Major
>             Fix For: 0.7.0
>
>
> As [~nghiaxlee] pointed out in a change we don't have the functionality to 
> create list validators (in which case all elements of the input lists should 
> be validated using an encapsulated validator), so we can't validate multiple 
> choice properties for eg. 
> The change itself is quite easy, although we should keep in mind C2 
> integration. Because of this [~phrocker] and [~kdoran] I would like to ask 
> for your feedback on adding this into agent manifest. Thanks in advance!
> I scoped this for 0.7.0 as the MiNiFi impact would be small, however I can 
> accept rescheduling it to 0.8.0 in case C2 integration requires more effort 
> and testing.



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