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https://issues.apache.org/jira/browse/NIFI-3206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15752071#comment-15752071
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ASF GitHub Bot commented on NIFI-3206:
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GitHub user mattyb149 opened a pull request:
https://github.com/apache/nifi/pull/1333
NIFI-3206: Add ifElse function to Expression Language
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Alternatively you can review and apply these changes as the patch at:
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This closes #1333
----
commit baeeb8646850f65541a784f1a61ffd7502305aa1
Author: Matt Burgess <[email protected]>
Date: 2016-12-15T18:12:55Z
NIFI-3206: Add ifElse function to Expression Language
----
> 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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