[jira] [Updated] (NIFI-3206) Add ifElse function to Expression Language

["Matt Burgess (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/NIFI-3206?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matt Burgess updated NIFI-3206:
-------------------------------
    Status: Patch Available  (was: In Progress)

> Add ifElse function to Expression Language
> ------------------------------------------
>
>                 Key: NIFI-3206
>                 URL: https://issues.apache.org/jira/browse/NIFI-3206
>             Project: Apache NiFi
>          Issue Type: Improvement
>            Reporter: Matt Burgess
>            Assignee: Matt Burgess
>
> Although UpdateAttribute's Advanced tab lets the user perform conditional processing (if-else, e.g.), it would be nice to allow for simple conditionals wherever Expression Language is supported.
> For example, in any EL-supported property, I could specify (with an attribute "filename" for example):
> ${filename:isNull():ifElse('not_found', 'found')}
> Then if filename is null this will evaluate to 'not_found', and if it is non-null it would evaluate to 'found'. For consistency the subject should be allowed to be anything that can be evaluated as a boolean, so if "myVal" is set to the string "true", then:
> ${myVal:ifElse('a', 'b')} 
> should evaluate to 'a'



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